CN104354867A - Design method of big supercooling water droplet icing detector and detector - Google Patents
Design method of big supercooling water droplet icing detector and detector Download PDFInfo
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- CN104354867A CN104354867A CN201410504716.5A CN201410504716A CN104354867A CN 104354867 A CN104354867 A CN 104354867A CN 201410504716 A CN201410504716 A CN 201410504716A CN 104354867 A CN104354867 A CN 104354867A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0255—Investigating particle size or size distribution with mechanical, e.g. inertial, classification, and investigation of sorted collections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N2015/0288—Sorting the particles
Abstract
The invention disclose a method for designing the configuration of a big supercooling water droplet icing detector based on a numerical computation method of movement and knock-on effect of supercooling water droplets. The existing icing detector can analyze whether an ice-formation condition exists or not through detecting the information such as liquid water content and temperature in the atmosphere. The invention aims to solve the problem that the conventional detecting method is only sensitive to the liquid water content, cannot differentiate water droplet sizes, and cannot be used for SLD icing detection. The detector comprises a first bulge and a rear part, wherein the first bulge is connected with the rear part through a groove. According to the invention, the configuration of the detector with curvature change is designed, so that in the conventional water dropping condition, water droplets all strike the front part of the configuration, so that only one continuous striking area is formed in the detector; while under the condition of SLD, the supercooling water droplets strike both the front part and the rear part, therefore, a plurality of incontinuous icing areas are formed in the detector.
Description
Technical field
The present invention relates to aerospace detection field, the method for designing of the cold large water droplet icing detector of especially a kind of mistake and detector.The present invention effectively can determine whether there is cold large water droplet in flight environment of vehicle, thus provides safeguard for aircraft safety precaution of freezing.
Background technology
Air height exists in the air lower than zero degree, but also belongs to liquid super-cooling waterdrop, and this water droplet is interfered a little just may quick freezing.When aircraft passes the cloud layer containing super-cooling waterdrop, super-cooling waterdrop strikes aircraft surfaces, icing phenomenon will occur, and freezing is one of important hidden danger of flight safety.Since a very long time in past, researcher once thought that aircraft froze and was mainly less than by diameter that the cold little water droplet of mistake of 50 μm causes, research is also carried out mainly for crossing cold little water droplet, American Eagles aviation in 1994 is difficult and a series of due to SLD (Supercooled Large Droplet afterwards, the general reference diameter super-cooling waterdrop that is greater than 50 μm) airplane crash caused of freezing makes people recognize, SLD freezes and is extensively present in flight practice, often freezes larger than little water droplet to the harm that flight safety causes.
Whether present icing detector can only exist ice-formation condition in atmospheric sounding, and whether can not there is SLD in atmospheric sounding, the method of domestic and international existing detector is: the information such as the Liquid water content in atmospheric sounding, temperature, analyze and whether there is ice-formation condition, before airframe occurring freeze, send warning signal.An existing method liquid towards liquid water content is responsive, and can not distinguish drop particle diameter, this just makes these detectors existing all can not be used for the identification of SLD freezing environment.
The people such as Ge Junfeng, Xu Yifei, Zhou Can of the Central China University of Science and Technology explore the design of SLD icing detector, their method of designing proposing two kinds of SLD icing detector profiles, a kind of is utilize some guess design various shapes SLD being divided to performance, experimental technique is relied on to determine profile, this method lacks the foundation of profile curvature design, select the qualified Exterior Surface Design cycle by a large amount of experiments long, cost is high; Second method utilizes SLD to strike leading edge slowly to flow into groove, flow to the icing guess design outline curve of rear shuttle sidewall again, this method is the same with a kind of front method, lack the foundation of profile curvature design, there is design equally, proving period is long, the shortcoming that cost is high, and this method is strong to super-cooling waterdrop temperature-independent, if temperature is very low, even if having SLD to strike leading edge also can freeze at once, can not flow to groove and rear shuttle, this method is in fact infeasible.In addition, some of the charging properties that these two kinds of methods are all frozen with routine based on freezing to SLD are guessed and are carried out configuration design, but charging properties except with drop particle diameter size mutually outside the Pass, also relevant to other conditions such as temperature, Liquid water content, the method for designing of dependence charging properties can not distinguish SLD completely and conventional water droplet freezes.
In sum, whether existing ripe icing detector can only exist ice-formation condition in atmospheric sounding, and whether can not there is SLD in atmospheric sounding; The Exterior Surface Design of existing SLD icing detector all relies on some guesses of designer, lacks design considerations, and design, proving period are long, and cost is high, and there are some defects designed.
Summary of the invention
Existing icing detector is by the information such as Liquid water content, temperature in atmospheric sounding, and whether further analysis exists ice-formation condition.The object of the invention is to solve an existing detection mode liquid towards liquid water content responsive, and drop particle diameter can not be distinguished, the problem of SLD icing detection cannot be used for.The invention provides and a kind ofly designed the method for cold large water droplet (SLD) icing detector profile based on super-cooling waterdrop motion with the numerical computation method clashed into, be i.e. the method for designing of the cold large water droplet icing detector of a kind of mistake and detector.It is responsive that goal of the invention of the present invention is to solve an existing detection mode liquid towards liquid water content, and can not distinguish drop particle diameter, cannot be used for the problem of SLD icing detection.Compared with freezing with conventional water droplet, SLD freezes more serious to the harm of Flight Safety, therefore, adopts suitable method to detect in flight environment of vehicle whether there is SLD, has very practical engineering significance to the flight safety under ice-formation condition.The invention discloses method of designing and the detector of the cold large water droplet icing detector of a kind of mistake, method of designing of the present invention utilizes SLD larger than conventional water droplet inertia, water droplet trajectory departs from the slow feature of running orbit, design the detector configuration of Curvature varying, under making conventional water droplet condition, water droplet will all strike the front portion of configuration, whole detector only has a continuous print impingement region; Under SLD condition, except previous section has except super-cooling waterdrop knocks, after also will run into the shock of super-cooling waterdrop, this will show as detector and occur multiple discontinuous ice field.Determine whether there is SLD in flight environment of vehicle by ice field number, thus provide initial conditions for aircraft safety precaution of freezing.
To achieve these goals, the present invention adopts following technical scheme:
A method of designing for the cold large water droplet icing detector of mistake, comprises the steps:
(1) design a detector configuration, this detector configuration comprises the first protruding and rear portion, and be connected by groove between described first projection and rear portion, wherein, described rear portion is made up of several second projections, is connected between described second projection by groove;
(2) For Determining The Droplet Trajectories that the detector configuration designed step 1 carries out under conventional water droplet calculates, and the For Determining The Droplet Trajectories crossed under cold large water droplet condition calculates;
(3) if the result of step 2 shows, at conventional water droplet and under crossing cold large water droplet condition, the words that first protruding and rear portion all has droplets impact its to arrive, illustrate under conventional water droplet and SLD condition, first projection and rear portion can freeze, cold large water droplet condition is crossed with regard to None-identified, raise the height of the first projection or reduce the height of the second projection in rear portion, obtain new detector configuration, the new detector configuration obtained is returned under step 2 carries out conventional water droplet respectively and calculate with the For Determining The Droplet Trajectories crossed under cold large water droplet condition;
If at conventional water droplet and under crossing cold large water droplet condition, rear portion all there is no the words that droplets impact its arrives, illustrate under conventional water droplet and SLD condition, second projection at rear portion all can not be frozen, also None-identified crosses cold large water droplet condition, reduce the height of the first projection or raise the height of the second projection in rear portion, obtaining new detector configuration, the new detector configuration obtained being returned under step 2 carries out conventional water droplet respectively and calculate with the For Determining The Droplet Trajectories crossed under cold large water droplet condition;
If under conventional water droplet condition, water droplet only impinges upon in the first projection of detector configuration, and under SLD condition, the first projection and rear portion all there is droplets impact its to arrive, show that this detector configuration meets the requirements, terminate design.
In described step 3, whether there is multiple discontinuous ice field by detector configuration and judge whether to there is cold large water droplet, distinguished cold large water droplet and conventional water droplet by the icing situation at detector configuration rear portion.
In described step 1, described rear portion is made up of second projection, and described first projection is connected by groove with between the second projection.
In described step 3, the described height of the first projection and the height at rear portion are based on the For Determining The Droplet Trajectories result of calculation under conventional water droplet and under the cold large water droplet condition of mistake.
One crosses cold large water droplet icing detector, comprises the first protruding and rear portion, and be connected by groove between described first projection and rear portion, described rear portion is made up of several second projections, connected by groove between described second projection.
Described rear portion is made up of second projection, and described first projection is connected by groove with between the second projection.This structure formed front projection, in the configuration of recessed, rear projection.
Described first projection can be frozen under conventional water droplet and SLD condition; Second projection at described rear portion is not frozen in conventional water droplet condition bottom, is crossing under cold large water droplet condition and can freeze.
Described rear portion is made up of second projection, and described first projection is connected by groove with between the second projection.
For foregoing problems, the invention provides method of designing and the detector of the cold large water droplet icing detector of a kind of mistake.In method of the present invention, the detector configuration of a design Curvature varying, under making conventional water droplet condition, water droplet will all strike the front portion (namely in the first projection) of configuration, whole detector only have a continuous print impingement region; And crossing under cold large water droplet condition, except anterior (namely in the first projection) has except super-cooling waterdrop knocks, rear portion also will run into the shock of super-cooling waterdrop, on the detector thus show multiple discontinuous ice field.
For the simplest three impingement regions, this detector comprises first protruding and the second projection, and the first projection and second projects through groove and is connected, and namely this detector is made up of two bossings, using the first projection as front bossing, using the second projection as rear bossing.The front bossing of detector there will be icing under conventional super-cooling waterdrop, and then bossing there will not be icing phenomenon; And under SLD condition, front bossing and the rear bossing of detector all there will be icing situation.Detect whether there is ice-formation condition by the icing situation of detector diverse location, distinguish simultaneously SLD freeze with conventional super-cooling waterdrop freeze.Adopt detector of the present invention, conventional water droplet can only impinge upon bossing before detector (namely first is protruding), then namely can strike on the rear portion of detector, identify that SLD freezes by the difference of ice forming locations in SLD situation.
In the present invention, the configuration protruding before the first projection, groove, rear portion are formed, middle concave is entered, rear portion is protruding again, thus form the change of concavo-convex slope of a curve, and concavo-convex slope of a curve changes the key factor of the design of the present invention just.By the design to panel detector structure, under making SLD condition, a water droplet energy part strikes in the first projection, and a part strikes on rear portion.
In the present invention, first design a detector configuration, and calculate respectively its under conventional water droplet and the For Determining The Droplet Trajectories crossed under cold large water droplet condition calculate.
According to the result calculated, if at conventional water droplet and under crossing cold large water droplet condition, the first projection and rear portion all there is droplets impact its to arrive, shows that front and back bossing all can freeze under conventional water droplet and SLD condition, cross cold large water droplet condition with regard to None-identified.In that case, need to improve configuration, after this situation illustrates, bossing slope projection is too many, method by suitably raising lordosis Partial Height or the rear male portion height of reduction obtains new configuration, calculates under the new detector configuration obtained being repeated again conventional water droplet with the For Determining The Droplet Trajectories crossed under cold large water droplet condition.
If at conventional water droplet and under crossing cold large water droplet condition, rear portion does not all have droplets impact its arrive, illustrate that, under conventional water droplet and SLD condition, second projection at rear portion all can not be frozen, also None-identified crosses cold large water droplet condition.Therefore, need to improve configuration, after this situation illustrates, bossing slope projection very little, reduce the height of the first projection or raise the height of the second projection in rear portion, obtain new detector configuration, the new detector configuration obtained is returned under step 2 carries out conventional water droplet respectively and calculate with the For Determining The Droplet Trajectories crossed under cold large water droplet condition.
If under the little water droplet condition of routine, water droplet only impinges upon in the first projection of detector configuration, and does not impinge upon on rear portion, and under SLD condition, first the second projection that is protruding and rear portion all has droplets impact its to arrive, and this shows, this configuration is under SLD condition, rear portion can freeze, and under conventional water droplet condition, second projection at rear portion can not be frozen, then this configuration meets the requirements, this configuration is the configuration of required design, terminates design.
Detector in the present invention comprises two or more male and fomale(M&F), and the difference of the impact characteristics that the slope of each connecting bridge and height are dripped by different-grain diameter Water Under is determined.The present invention utilizes the feature that SLD is different from conventional For Determining The Droplet Trajectories, judges whether to there is SLD by whether there is multiple discontinuous ice field, and the icing situation at detector configuration rear portion distinguishes freezing of SLD and conventional water droplet.
Existing method causes guess such as charging properties inconsistent grade to carry out the configuration design of SLD icing detector based on there is subcooled water overflow under SLD condition, but charging properties except with drop particle diameter size mutually outside the Pass, also relevant to other conditions such as temperature, Liquid water content, the difference of charging properties can not distinguish SLD and conventional water droplet completely, For Determining The Droplet Trajectories then has nothing to do with the condition such as temperature, Liquid water content, thus the present invention is based on the detector Exterior Surface Design of For Determining The Droplet Trajectories, the difference of SLD and the little water droplet of routine can better be distinguished.The profile curvature design method of existing SLD icing detector lacks design considerations, too much experiment brings design process cycle long, defect costly, and the present invention is by the method design curve of droplets impact its computational analysis, do not need to produce multiple Curvature varying profile to carry out lot of experiments to select, greatly save cost and design cycle, there is significant progress.
The feature of applicant by freezing under research SLD and conventional super-cooling waterdrop, by designing a kind of new detector configuration, thus detect in flight environment of vehicle whether there is SLD condition, for aircraft protection of freezing provides initial conditions accurately, to the safe flight under aircraft ice-formation condition, there is significant progressive meaning.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the water droplet trajectory figure of the first detector configuration under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 2 is that the first detector configuration is crossing the water droplet trajectory figure under cold large water droplet (drop diameter d=100 micron) condition.
Fig. 3 is the water droplet trajectory figure of the second detector configuration under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 4 is that the second detector configuration is crossing the water droplet trajectory figure under cold large water droplet (drop diameter d=100 micron) condition.
Fig. 5 is the water droplet trajectory figure of the third detector configuration under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 6 is that the third detector configuration is crossing the water droplet trajectory figure under cold large water droplet (drop diameter d=100 micron) condition.
Fig. 7 is the water droplet trajectory figure of the 4th kind of detector configuration under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 8 is that the 4th kind of detector configuration is crossing the water droplet trajectory figure under cold large water droplet (drop diameter d=100 micron) condition.
Detailed description of the invention
All features disclosed in this specification sheets, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification sheets, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Embodiment 1
One, the design objective of cold large water droplet detector configuration was formulated.
The detector configuration of a design Curvature varying, make it under conventional water droplet condition, water droplet will all strike the front portion of configuration, whole detector only has a continuous print impingement region.And under SLD condition, except previous section has except super-cooling waterdrop knocks, after also will run into the shock of super-cooling waterdrop, show as detector and occur multiple discontinuous ice field.
Below all for the simplest three impingement regions, design a detector configuration, this detector configuration comprises the first protruding and rear portion, and rear portion is made up of second projection, is connected between the first projection with the second projection by groove.Namely this detector is made up of two bossings, forms the detector configuration of different transition phase slope.The design objective of this detector configuration is: after detector configuration, bossing (namely second is protruding) there will not be icing situation under conventional super-cooling waterdrop condition, and under SLD condition, there will be icing situation, before configuration, boss (namely first is protruding), under different super-cooling waterdrop condition, all can freeze.Detect whether there is ice-formation condition by the icing situation of diverse location, and distinguish freezing of SLD and conventional water droplet.Namely conventional water droplet can only impinge upon in the first projection of detector configuration, crosses cold large water droplet and then can strike in the second projection, thus by the difference of ice forming locations, realize the identification to large water droplet icing detection.
Two, in order under making SLD condition, a water droplet energy part strikes previous section, and a part strikes aft section.Detector configuration is protruding before must being, middle concave is entered, configuration protruding more below, and concavo-convex slope of a curve change is the key factor of design.In the present embodiment, the groove being similar to the continual curvature change of elliptoid object Intermediate Gray with is for initial configuration, and carry out the calculating of super-cooling waterdrop impact characteristics, method of calculating is as described below.
Super-cooling waterdrop impact characteristics method of calculating mainly comprises two parts: air flow field method of calculating, droplets impact its method of calculating.
(1) detector surrounding air flow field method of calculating
Carry out icing detector Design of Aerodynamic Configuration, need calculating detector ambient air flow field.
1. governing equation
The governing equation that air flow field calculates is the time equal N-S equation of low speed viscosity flow, and its common version is:
In equation (1), ρ
afor density of air,
for air velocity,
with
get different values, the transport equation of other scalars such as the continuity equation of air field, momentum equation and tubulence energy can be represented.
2. the discrete method of governing equation
Adopt the discrete solving equation of finite volume method (1).The hexahedron put centered by a P, discrete method every in equation is:
I convective term discrete
According to divergence theorem of Gauss, it is discrete that convective term adopts following scheme to carry out
In formula (2), nb=e, w, n, s, t, b, represent six faces of the control volume centered by P point respectively,
for each corresponding area, the governing equation for air phase has
Variate-value on control volume interface
the method combined by upstream interpolation and linear interpolation calculates, and for boundary surface " e ", interpolation method is
Wherein
for the amount of upstream interpolation,
for the amount of linear interpolation, ε is hybrid cytokine, 0≤ε≤1.
II source item discrete
The source item of transport equation has different expression formulas to different equations, in order to make its discretization expression formula approach source item itself as far as possible, strengthening the main diagonal dominance of algebraic equation, improving Algebraic Equation set and asking stability of solution, adopt linearized fashion to do to source item to process, even
Then the discrete form of source item is
In formula, δ V is the volume of control volume.
III time term is discrete
It is discrete that time term adopts following order precision format to carry out
Wherein, subscript n+1, n and n-1 represents the value of t+ Δ t, t and t-Δ t respectively.
(2) water droplet moving track calculation method
In order to determine the placement location of detector, need the path of motion studying water droplet in detector flow field, in order to make trajectory calculation more directly perceived, we adopt Euler's method to calculate water droplet path of motion.
1. the water droplet equation of motion
Calculating water droplet moves, and is that on the basis of resolving in flow field, by Newton's second law, in rectangular coordinate system, the three-dimensional water droplet equation of motion can be write as
Wherein, M
dwater droplet quality, A
dthe wind area of water droplet, V
ddrop volume, ρ
abe density of air, g is acceleration due to gravity, C
ddrag coefficient, u
a, v
a, w
adistribution represents the local air-flow velocity in x, y, z direction, u
d, v
d, w
ddistribution represents the local water drip rate in x, y, z direction.
2. the governing equation of water droplet phase Flow Field Calculation
Introduce water droplet fraction by volume α, it is defined as the volume ratio that in the micelle of space, water droplet is shared mutually, then can set up the governing equation of water droplet phase, comprise equation of continuity and momentum equation, be respectively:
In equation (9), (10),
for water drip rate, ρ
dfor water droplet density,
for acceleration due to gravity, K is inertial factor, and its expression formula is
In formula (11), μ
afor aerodynamic force coefficient of viscosity, d
eqfor drop diameter, C
dfor water droplet drag coefficient, Re is relative Reynolds number, and its expression formula is
In water droplet motion process, resistance changes with relative Reynolds number change, and the application adopts following formulae discovery resistance:
Similar with air field governing equation, water droplet phase control equation can unify the form being write as transport equation:
Wherein,
for source item,
get 1, u
d, v
dor w
drepresent the momentum equation in equation of continuity and x, y, z direction respectively.
3. the discrete method of water droplet phase control equation
For equation (14), convective term is consistent with equation (1) with the discrete method of source item, and time term adopts single order explicit discrete, namely
4. wall boundary condition
Water droplet calculates mutually, adopts wall to suck boundary condition, if namely water droplet and object plane collide, then thinks that water droplet flows out from collision point.
5. the calculating of drop collection rate
Because water droplet fraction by volume α is less by (10
-6magnitude), can think that air and water droplet are unidirectional actions, namely only consider that air is to the effect of water droplet, ignores the effect of water droplet to air.Therefore, the calculation procedure of drop collection rate can be summarized as: first, calculates air field, and adopt SIMPLE method to calculate air field herein, turbulence model is standard k-ε turbulence model; Secondly, on the basis obtaining air flow field distribution, water droplet phase control equation is solved; Finally, drop collection rate β can at the relative velocity obtaining local water droplet fraction by volume α and water droplet and object plane
afterwards, obtained by following formula:
Wherein, α
∞for far field water droplet fraction by volume,
for far field water drip rate,
for the unit normal vector at object plane collision point place.
Three, the For Determining The Droplet Trajectories that the detector configuration of design carries out under conventional water droplet and SLD condition is calculated.
Adopt said method, detector configuration is carried out to the calculating of For Determining The Droplet Trajectories.In addition, aircraft freezes often in the landing stage, and speed can not be too high, therefore, calculates the speed all adopting 100m/s.
Give the first detector configuration in Fig. 1, carry out conventional For Determining The Droplet Trajectories calculating to it, Fig. 1 gives its water droplet trajectory figure under conventional water droplet condition.
Meanwhile, carried out cold large For Determining The Droplet Trajectories to the first detector configuration and calculate, Fig. 2 gives it and is crossing the water droplet trajectory figure under cold large water droplet condition.
Result shows, no matter be little water droplet (i.e. conventional water droplet) or large water droplet (namely crossing cold large water droplet), all can not collide at the rear portion of detector configuration, under normal circumstances, detector configuration rear portion all can not freeze, certainly, may freeze in some region at rear portion under strong flooded conditions, but the condition of strong overflow does not possess universality, therefore, the first profile all can not realize the design objective of expecting.
As can be seen from Figure, under conventional water droplet and SLD condition, the second projection does not all have droplets impact its to arrive, and under conventional water droplet and SLD condition are described, the rear portion at the second protruding place all can not freeze, and this just can not identify SLD condition.Therefore, the basis of the first detector configuration is improved, this situation illustrates the slope projection of the second projection very little, obtains new configuration, i.e. the second detector configuration by the height of suitably raising the second projection or the method for height that reduces the first projection.
Four, continue to adopt said method, For Determining The Droplet Trajectories calculating is carried out to the second detector configuration.Fig. 3 is the water droplet trajectory figure of the second detector configuration under conventional water droplet (drop diameter d=20 micron) condition, Fig. 4 is that the second detector configuration is crossing the water droplet trajectory figure under cold large water droplet (drop diameter d=100 micron) condition.Can find out in Fig. 3, Fig. 4, rear portion does not still have droplets impact its to arrive, and continues to improve, raised by rear portion slope and obtain the third profile profile.
Five, For Determining The Droplet Trajectories calculating is carried out to the third profile, as can be seen from Fig. 5, Fig. 6, after detector, the rear portion (namely second is protruding) of row has droplets impact its to arrive under conventional super-cooling waterdrop and SLD condition, after this situation illustrates, bossing slope projection is too many, method by suitably raising lordosis Partial Height or the rear male portion height of reduction obtains new configuration, continue to improve to profile, obtain the 4th kind of profile.
Six, For Determining The Droplet Trajectories calculating is carried out to the 4th kind of profile, can find out from Fig. 7, Fig. 8: under the little water droplet condition of routine, water droplet only impinges upon in the first projection of detector configuration; And under SLD condition, the first projection and the second projection have droplets impact its to arrive.This shows, the rear portion at this configuration second protruding place under SLD condition can freeze, and under conventional water droplet condition, the rear portion at the second protruding place can not freeze, and this configuration meets the requirements, and namely the 4th kind of profile is the required configuration designed, and terminates design.
Result of practical application shows, cross the method for cold large water droplet (SLD) icing detector profile based on super-cooling waterdrop motion and the method design clashing into numerical calculation in the present invention, there is design cycle short, low cost and other advantages, and do not rely on other conditions such as temperature, Liquid water content, effectively can distinguish SLD and conventional water droplet to freeze, thus provide initial conditions accurately for aircraft protection of freezing, to the safe flight under aircraft ice-formation condition, there is significant progressive meaning.
The present invention is not limited to aforesaid detailed description of the invention.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (7)
1. a method of designing for the cold large water droplet icing detector of mistake, is characterized in that, comprise the steps:
(1) design a detector configuration, this detector configuration comprises the first protruding and rear portion, and be connected by groove between described first projection and rear portion, wherein, described rear portion is made up of several second projections, is connected between described second projection by groove;
(2) For Determining The Droplet Trajectories that the detector configuration designed step 1 carries out under conventional water droplet calculates, and the For Determining The Droplet Trajectories crossed under cold large water droplet condition calculates;
(3) if the result of step 2 shows, at conventional water droplet and under crossing cold large water droplet condition, the words that first protruding and rear portion all has droplets impact its to arrive, illustrate under conventional water droplet and SLD condition, first projection and rear portion all can freeze, cold large water droplet condition is crossed with regard to None-identified, raise the height of the first projection or reduce the height of the second projection in rear portion, obtain new detector configuration, the new detector configuration obtained is returned under step 2 carries out conventional water droplet respectively and calculate with the For Determining The Droplet Trajectories crossed under cold large water droplet condition;
If at conventional water droplet and under crossing cold large water droplet condition, rear portion all there is no the words that droplets impact its arrives, illustrate under conventional water droplet and SLD condition, second projection at rear portion all can not be frozen, also None-identified crosses cold large water droplet condition, reduce the height of the first projection or raise the height of the second projection in rear portion, obtaining new detector configuration, the new detector configuration obtained being returned under step 2 carries out conventional water droplet respectively and calculate with the For Determining The Droplet Trajectories crossed under cold large water droplet condition;
If under conventional water droplet condition, water droplet only impinges upon in the first projection of detector configuration, and under SLD condition, the first projection and rear portion all there is droplets impact its to arrive, show that this detector configuration meets the requirements, terminate design.
2. according to claim 1 or 2, cross the method for designing of cold large water droplet icing detector, it is characterized in that, in described step 3, whether there is multiple discontinuous ice field by detector configuration and judge whether to there is cold large water droplet, distinguished cold large water droplet and conventional water droplet by the icing situation at detector configuration rear portion.
3. according to claim 1 or 2, cross the method for designing of cold large water droplet icing detector, it is characterized in that, in described step 1, described rear portion is made up of second projection, and described first projection is connected by groove with between the second projection.
4. according to claim 1 or 2, cross the method for designing of cold large water droplet icing detector, it is characterized in that, in described step 3, the described height of the first projection and the height at rear portion are based on the For Determining The Droplet Trajectories result of calculation under conventional water droplet and under the cold large water droplet condition of mistake.
5. the cold large water droplet icing detector of mistake, is characterized in that, comprises the first protruding and rear portion, and be connected by groove between described first projection and rear portion, described rear portion is made up of several second projections, is connected between described second projection by groove.
6. cross cold large water droplet icing detector according to claim 4, it is characterized in that, described rear portion is made up of second projection, and described first projection is connected by groove with between the second projection.
7. according to claim 4 or 5, cross cold large water droplet icing detector, it is characterized in that, described first projection can be frozen under conventional water droplet and SLD condition; Second projection at described rear portion is not frozen under conventional water droplet condition, is crossing under cold large water droplet condition and can freeze.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610333142.9A CN106018199A (en) | 2014-09-26 | 2014-09-26 | SLD (supercooled large droplet) icing detector |
| CN201410504716.5A CN104354867B (en) | 2014-09-26 | 2014-09-26 | A kind of method for designing of supercool big water droplet icing detector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105117558A (en) * | 2015-09-13 | 2015-12-02 | 北京航空航天大学 | Modeling method for spray cooling surface liquid film distortion caused by harmful high overload |
| CN105836159A (en) * | 2016-05-18 | 2016-08-10 | 中国航空工业集团公司西安飞机设计研究所 | Aircraft icing detector ground test method |
| CN105865100A (en) * | 2016-04-05 | 2016-08-17 | 北京航空航天大学 | Sample piece ejection type supercooled liquid drop impact microscopic observation system |
| CN105857621A (en) * | 2016-05-06 | 2016-08-17 | 武汉航空仪表有限责任公司 | Integrated ice detector |
| CN106569289A (en) * | 2016-10-18 | 2017-04-19 | 北京无线电测量研究所 | Method and device for recognizing supercooled water |
| CN107132278A (en) * | 2017-06-07 | 2017-09-05 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of polycylindser array icing detection method |
| CN110077601A (en) * | 2019-05-16 | 2019-08-02 | 中国商用飞机有限责任公司 | Super-cooling waterdrop icing detector and mixed state icing detector |
| CN112550723A (en) * | 2020-12-25 | 2021-03-26 | 华中科技大学 | Super-cooled large water drop icing probe and detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111553084B (en) * | 2020-04-30 | 2023-04-04 | 中国直升机设计研究所 | Helicopter icing detection position optimization method, electronic product and storage device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105117558A (en) * | 2015-09-13 | 2015-12-02 | 北京航空航天大学 | Modeling method for spray cooling surface liquid film distortion caused by harmful high overload |
| CN105117558B (en) * | 2015-09-13 | 2018-05-04 | 北京航空航天大学 | A kind of modeling method for the misting cooling surface liquid film distortion that unfavorable high overload induces |
| CN105865100A (en) * | 2016-04-05 | 2016-08-17 | 北京航空航天大学 | Sample piece ejection type supercooled liquid drop impact microscopic observation system |
| CN105857621A (en) * | 2016-05-06 | 2016-08-17 | 武汉航空仪表有限责任公司 | Integrated ice detector |
| CN105836159A (en) * | 2016-05-18 | 2016-08-10 | 中国航空工业集团公司西安飞机设计研究所 | Aircraft icing detector ground test method |
| CN106569289A (en) * | 2016-10-18 | 2017-04-19 | 北京无线电测量研究所 | Method and device for recognizing supercooled water |
| CN107132278A (en) * | 2017-06-07 | 2017-09-05 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of polycylindser array icing detection method |
| CN110077601A (en) * | 2019-05-16 | 2019-08-02 | 中国商用飞机有限责任公司 | Super-cooling waterdrop icing detector and mixed state icing detector |
| CN112550723A (en) * | 2020-12-25 | 2021-03-26 | 华中科技大学 | Super-cooled large water drop icing probe and detector |
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| CN106018199A (en) | 2016-10-12 |
| CN104354867B (en) | 2016-06-29 |
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