CN104417738A - Novel low-noise highly-skewed ducted propeller - Google Patents
Novel low-noise highly-skewed ducted propeller Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
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Abstract
The invention discloses a novel low-noise highly-skewed ducted propeller. The features of a highly-skewed propeller and the features of a ducted propeller are combined, and the form of the highly-skewed propeller is introduced on the basis of the ducted propeller; the seven-blade highly-skewed propeller with low vibration and noise serves as a propeller portion of the novel low-noise highly-skewed ducted propeller, the line type of the seven-blade highly-skewed propeller is optimized, and therefore the seven-blade highly-skewed propeller can be matched with a duct and a propeller cap in a coordination mode, the effect that underwater vibration noise of propellers is lowered is achieved, and water power, strength and other performance are guaranteed. The novel low-noise highly-skewed ducted propeller can serve as a low-noise propeller of an underwater vehicle and can also be used by submarines needing to navigate in a low-noise state and torpedoes needing to navigate in a low-noise state.
Description
Technical field:
Patent of the present invention relates to a kind of noise-reduced propeller for submarine navigation device (comprising the submarine navigation device (ROV) etc. of UAV navigation (UUV), marine independently aircraft (AUV) and remote control), be called the large skew back shrouded propeller of low noise, also can be used for submarine that needs navigate by water under low noise state or torpedo.
Background technology:
Submarine navigation device bears operation under oceanographic survey, seafari and exploitation, underwater exploration, navigation, communication, unsafe conditions, the multiple-task such as emergency survival and salvaging, and can the aircraft of Reusability, has very large practicality and alerting ability.
Propelling unit, as the important component part of submarine navigation device, has material impact to its performance.Along with the raising required Underwater Vehicle Hydrodynamic performance, noisiness, the propelling units such as the shrouded propeller generally adopted at present, conventional propeller can not meet requirements completely.Particularly very high to hydroacoustic noise performance requriements submarine navigation device, propelling unit, as one of its Main Noise Sources, must reduce as much as possible.
The noise that underwater propeller produces comprises three parts: (a) propeller works vibrates the noise (being called to come flow noise) produced at uneven flow field Leaf; Cavitation erosion (being called cavitation erosion) caused by (b) propeller cavitation; Submarine navigation device vibration caused by (c) propeller exciting force and the noise (being called radiated noise) of radiation thereof.
Seven leaf highly skewed propellers, as a kind of noise-reduced propeller, effectively can weaken above three kinds of noises.Submarine is widely applied, as shown in Figure 1.It is closely related that seven leaf highly skewed propellers can reduce the mechanism of vibration & noise and its blade profile and lobe numbers.Because submarine afterbody has uneven flow field to exist, propeller blade works and will produce the load that time-dependent thrust and torque fluctuate like this in uneven flow field, this load can cause blade, axle system vibration thus produce noise.The screw propeller of common symmetric form blade (10), in rotary course, screw propeller hand of rotation is (11), whole blade can simultaneously by uneven and incoming flow (12) in radial direction, and thrust and the vibration of the blade caused by torque fluctuation can be very large.And the blade (13) of seven leaf highly skewed propellers have employed large skew back form, make blade can not arrive higher-pressure region or meiobar (12) in uneven flow field in radial direction simultaneously, namely whole blade can not be caused to be in the recurrent state of high pressure-low pressure-high pressure, as shown in Fig. 2 (a), so just effectively can suppress the vibration of blade, thus reduce the noise of screw propeller.In the curve of Fig. 2 (b) single paddle vibration amplitude F (t) t change in time, the peak value of peakedness ratio symmetric form blade vibration amplitude curve (15) of highly skewed propeller blade vibration amplitude curve (14) is much smaller.In addition, the number of blade is seven leaf highly skewed propellers of seven leaves, more than the number of sheets of five vane propellers of routine, and the blade area of whole screw propeller bearing thrust is increased, and the thrust thus on each leaf decreases, and can reduce the disturbance force of screw propeller.When propeller blade rotates in addition, the pressure on blade reduces, and when pressure is lower than the pressure for vaporization of water, just can form cavity, and unstable cavity produces, crumbles and fall, and will form cavitation erosion.Thrust on the single paddle of seven leaf highly skewed propellers reduces, smaller relative to the reduction of five vane propeller single paddle upward pressures of same thrust, therefore can postpone the generation of cavity, avoid cavitation erosion.According to above three reasons, seven leaf highly skewed propellers can reach the object reducing vibration & noise.
For submarine navigation device, due to the particularity that it uses, seven leaf highly skewed propellers used on submarine directly can not be adopted.Because submarine navigation device in use usually will carry out folding and unfolding operation, in order to protect screw propeller to be unlikely to break in folding and unfolding process, usually need install protective case in screw propeller outside additional or use shrouded propeller.In addition due to the propelling unit often heavier loads of submarine navigation device, also need to adopt this form of shrouded propeller.
Shrouded propeller (abbreviation catheter propeller) is extraordinary angle of rake one, mainly in order to improve the efficiency of the higher high load capacity screw propeller of power coefficitent, as shown in Figure 3.It is a conduit on the peripheral equipment of conventional propeller, and the elevation profile of conduit is airfoil type or knuckle line style.Accelerating type conduit and deceleration type conduit can be divided into, as shown in Figure 4 by flow field difference in conduit.Acceleration duct screw propeller has the features such as efficiency is high, the better performances of thrust greatly, in stormy waves.For the high load capacity screw propeller that power coefficitent is higher, adopt the efficiency that it can reach, will conventional propeller be exceeded, push boat, towboat, fishing boat are used widely.For decelerating duct, contrary with acceleration duct, it produces negative thrust, adds ship resistance.But streamline expansion when the fluid in conduit flows through card place, velocity ratio conventional propeller is low, and pressure is then higher, to postponement or avoid the cavity of screw propeller to be beneficial to, so decelerating duct screw propeller is usually used in the situation that cavity easily occurs.Catheter propeller can not only be applied to propulsion of ship, and under water aircraft is also applied widely.In recent years, along with the fast development of submarine navigation device, the catheter propeller for its operating needs also more and more comes into one's own.
The submarine navigation device of some special purposes, as paravane, hunt thunder device etc., not only the load of screw propeller is heavier, and also has very high requirement to the vibration & noise of screw propeller.For meeting this requirement, according to catheter propeller and seven leaf highly skewed propellers advantage separately, proposing the large skew back shrouded propeller of Novel low noise of the present invention shrouded propeller and seven leaf highly skewed propellers combined and designing.
The present invention can not only provide the thrust needed for submarine navigation device, and its noise ratio conventional manifold oar has obvious reduction.Such as certain type submarine navigation device, propelling unit adopts conventional manifold oar and the present invention respectively, and the sound pressure level when 380rpm is compared, and the present invention can reduce noise 3 ~ 4dB.
Summary of the invention:
The object of the invention is to the hydroacoustic noise caused by propelling unit reducing submarine navigation device, and meet the requirement of the aspects such as submarine navigation device submarine navigation thrust, efficiency, intensity and use, for the propelling unit type selecting of submarine navigation device or boats and ships provides a kind of selection newly.
The present invention is primarily of highly skewed propeller (1), conduit (2) and hub cap (3) part composition, wherein highly skewed propeller can adopt and be made up of blade (4) and propeller hub (5), the axis hole (6) having screw propeller to install in propeller hub and keyway (7), as shown in Figure 5.Screw propeller part of the present invention, as shown in Figure 6, use for reference the form of the seven leaf highly skewed propellers for spacious Designing Water Environment that submarine generally uses, but according to the feature of shrouded propeller, the parameters such as blade chord length distribution, thickness distribution, trim and skew angle are redesigned, and coordinate mutually with conduit and hub cap part, make its performance such as hydrodynamic force, intensity reach good level.In the seven leaf highly skewed propellers that the present invention adopts and spacious water, the seven leaf highly skewed propeller line styles that use have a great difference, essential difference is that the seven leaf highly skewed propeller blade upper leaf tangent plane chord lengths that use in spacious water and pitch progressively reduce, and leaf ending position wing profile chord length is zero or very little.And seven leaf highly skewed propellers in the present invention, according to new environment for use (in conduit), adopt new Alignment Design, blade upper leaf tangent plane chord length and pitch are obviously greater than spacious water screw propeller, more thrust can be provided, as shown in Figure 7 on blade top.The seven leaf highly skewed propellers that the present invention adopts and conventional manifold screw propeller also have a great difference, essential difference is that the screw propeller number of sheets of conventional manifold screw propeller is generally four leaves, skew angle is very little, and the screw propeller number of sheets in the present invention is seven leaves, and the skew angle of screw propeller also increases a lot, the line style of screw propeller also has very big difference with the line style of conventional manifold screw propeller, as shown in Figure 8.Conduit portion of the present invention, has considerable influence to the hydrodynamic performance of screw propeller.Current conduit is mainly divided into accelerating type conduit and two kinds, deceleration type conduit.The part thrust of screw propeller has been transferred on conduit by accelerating type conduit, reduces the thrust on screw propeller, can improve the efficiency of the heavier screw propeller of load.For the feature that submarine navigation device propeller load is heavier, the present invention adopts accelerating type conduit, and its form as shown in Figure 9.The present invention can also redesign or type selecting screw propeller and conduit as required.
In the embodiment of the present invention, the open-water performance curve of screw propeller is as shown in Figure 10, when advance coefficient J equals 0.655, and spacious water efficiency eta
0reach peak 0.602.Finite Element Method is adopted to carry out propeller blade strength check to the embodiment of the present invention in addition.When adopting Cu alloy material, under design conditions, blade maximum stress appears at the wing profile lagging edge place of 0.5 times of radius (0.5R), maxim is 13.9Mpa, do not exceed the yield limit 380Mpa of material, margin of strength COEFFICIENT K=47.8 (calculating according to " GJB2735-96 ship propeller general specification ") of blade.Blade leaf is slightly out of shape maximum, reaches 0.243mm, but does not exceed the scope required by normal use.Find through strength check, the present invention can ensure the requirement of strength that submarine navigation device normally uses under water.
The installation of the present invention on certain unmanned vehicles is concrete as shown in Figure 11, other submarine navigation devices, submarine or torpedo is installed and can adjust according to actual conditions.
The invention has the beneficial effects as follows: provide a kind of propelling unit that effectively can reduce submarine navigation device vibration noise, and meet the requirement of the aspects such as submarine navigation device submarine navigation thrust, efficiency, intensity and use.
Enforcement of the present invention:
In the present invention, the geometric shape of screw propeller, conduit sectional line style and both relative positions determine, and just determine the present invention.
1. the geometric representation of screw propeller
1.1 pa-rameter symbols tables
(1) coordinate parameters:
X, y, z---three parameters of right-angle coordinate representation propeller blade space surface point coordinate;
X, r, θ---cylindrical coordinate represents three parameters of propeller blade space surface point coordinate;
(2) screw propeller parameter
R---propeller radius, unit: rice (m);
D---diameter of propeller, unit: rice (m);
R---the radial coordinates of screw blade tangent plane, unit: rice (m);
Z---propeller blade quantity, unit: individual;
The blade wing profile length (chord length) at C (r)---radius r place, unit: rice (m);
C
sthe distance (skew back) of the blade wing profile center line distance screw propeller line of reference at (r)---radius r place, unit: rice (m);
X
rthe blade wing profile at (r)---radius r place along the displacement (rake) in propeller axis direction, unit: rice (m);
T
mthe blade wing profile maximum ga(u)ge at (r)---radius r place, unit: rice (m);
F
mthe blade wing profile line of centers maximum camber at (r)---radius r place, unit: rice (m);
The blade wing profile pitch at P (r)---radius r place, unit: rice (m);
R
h---propeller hub radius, m;
---the pitch angle of blade wing profile, unit: radian;
---the blade gabarit skew angle at radius r place, unit: radian or degree;
(3) screw propeller dimensionless parameter
---the ratio of screw blade tangent plane space surface coordinate and propeller radius R;
ξ---blade wing profile winds up the coordinate on length direction, span [-1 ,+1];
F
tthe blade wing profile thickness profile function at (r, ξ)---radius r place;
F
cthe blade wing profile camber distribution function at (r, ζ)---radius r place;
---the radial coordinates of screw blade tangent plane and the ratio of propeller radius, be also called radius ratio;
---wing profile rake x
rwith the ratio of propeller radius R;
---the ratio of wing profile chord length C and propeller radius R;
---wing profile skew back C
swith the ratio of propeller radius R;
---the maximum camber f of wing profile
mwith the ratio of propeller radius R;
---wing profile maximum ga(u)ge t
mwith the ratio of propeller radius R;
For the convenience represented, all do not mark the independent variable of each parameter below, as chord length C (r) is expressed as C.
1.2 system of axes
For convenience of the geometric shape representing screw propeller, have employed rectangular coordinate system and cylindrical coordinate respectively, as shown in figure 12, additionally use local coordinate system for screw blade tangent plane, as shown in figure 13.In local coordinate system, coordinate ξ is along chord length direction towards guide margin.Coordinate origin 0
s=(x
s, r
s, θ
s) the coordinate η at place is perpendicular to ξ and point to the upper surface of wing profile.
1.3 skew back degree parameters
Wing profile guide margin and the lagging edge coordinate on extension face presses formula (1.1) respectively and Figure 13 calculates:
In formula: ξ
l(r), ξ
r(r)-wing profile guide margin and the lagging edge coordinate on extension face, unit: rice (m).
The skew back degree of blade profile is stated with skew angle, calculates by formula (1.2):
In formula: θ
s-blade rake angle, leaf slightly tangent plane should be not more than 2 π/Z, unit: radian.
The geometric parameter of 1.4 screw propellers
Table 1.1 gives the dimensionless number span of screw propeller geometric parameter in the present invention.These parameters will be used for the geometric shape determining screw propeller.
The geometric parameter of table 1.1 screw propeller
| Position | Pitch ratio | Skew angle | Trimratio | Chord length ratio | Maximum camber ratio | Maximum ga(u)ge ratio |
| r/R | P/D | θs(°) | X R/D | C/D | f m/C | t m/C |
| 0.2 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.3 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.4 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.5 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.6 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.7 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.8 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.9 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.95 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 0.975 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
| 1 | 0.8～1.4 | -25～40 | -0.04～0.01 | 0.10～0.30 | 0.01～0.05 | 0.05～0.3 |
The profile type of 1.5 wing profiles
The wing profile shape of screw propeller can use the tangential thickness of zero dimension and camber distribution function, i.e. F
t(r, ξ) and F
c(r, ζ) determines.The zero dimension variable quantity of chord length provides as follows :+1 is equivalent to guide margin, and-1 is lagging edge.
In embodiments of the present invention, the blade form of screw propeller adopts airfoil type, and propeller-blade section selects the camber distribution form of NACA 66mod thickness distribution and α=0.8, and these sectional line style data are the data published, and can consult screw propeller pertinent texts.
The determination of 1.6 screw propeller geometric shapes
Screw propeller geometric shape can be represented by the spatial point coordinate of blade surface, can be calculated the zero dimension artesian coordinates of blade surface by following formula:
In formula: the upper right corner+,-symbol represents wing profile upper surface and lower surface respectively.
After obtaining zero dimension artesian coordinates, then be multiplied by the radius R of screw propeller, just can determine the spatial point coordinate on actual propeller blade surface, and the final only geometric shape determining screw propeller.
2. the geometric representation of conduit
Conduit is gyro-rotor, if determine the shape in conduit elevation profile (as shown in Figure 9) and the internal diameter of conduit, and just can the only geometric shape determining conduit.Therefore conduit can by conduit elevation profile shape and catheter diameter be only determines.
Conduit elevation profile can environment used according to the invention and condition be designed, and also can select existing conduit longitudinal section.As the conduit that Shanghai Communications University's tank experiment pond can be adopted to develop, name is called BD15, shown in table specific as follows:
Table 1.2 conduit section offsets table
Wherein X is conduit elevation profile length direction coordinate, Y
inand Y
outwardbe respectively the short transverse coordinate of catheter inside surface and outside face in conduit elevation profile, L is the length of conduit.
3. case study on implementation
(1) case one
For certain unmanned vehicles, adopt the present invention as its propelling unit.Its diameter of propeller is 372mm, and the number of sheets is 7 leaves, and screw propeller parameter determined by following table:
Screw propeller geometric element in table 3.1 embodiment one
| Position | Pitch ratio | Skew angle | Trimratio | Chord length ratio | Maximum camber ratio | Maximum ga(u)ge ratio |
| r/R | P/D | θs(°) | X R/D | C/D | f m/C | t m/C |
| 0.2 | 1 | -14.7 | 0.002 | 0.190 | 0.0377 | 0.2633 |
| 0.3 | 1 | -20.9 | -0.004 | 0.208 | 0.0346 | 0.2046 |
| 0.4 | 1 | -21.7 | -0.013 | 0.222 | 0.0309 | 0.1655 |
| 0.5 | 1 | -17.5 | -0.026 | 0.234 | 0.0272 | 0.1414 |
| 0.6 | 1 | -10.9 | -0.033 | 0.242 | 0.0238 | 0.1207 |
[0081]
| Position | Pitch ratio | Skew angle | Trimratio | Chord length ratio | Maximum camber ratio | Maximum ga(u)ge ratio |
| r/R | P/D | 0s(°) | X R/D | C/D | f m/C | t m/C |
| 0.7 | 1 | -3.5 | -0.033 | 0.243 | 0.0213 | 0.1049 |
| 0.8 | 1 | 4.2 | -0.033 | 0.24 | 0.0187 | 0.0906 |
| 0.9 | 1 | 13.5 | -0.033 | 0.226 | 0.0161 | 0.0775 |
| 0.95 | 1 | 19.1 | -0.033 | 0.209 | 0.0146 | 0.074 |
| 0.975 | 1 | 21.9 | -0.033 | 0.196 | 0.0117 | 0.0724 |
| 1 | 1 | 24.6 | -0.033 | 0.181 | 0.0035 | 0.0708 |
Propeller hub and hub cap profile determined by following table:
Table 3.2 propeller hub and hub cap offsets table
The spatial value of screw propeller geometric shape can be calculated according to formula (1.1).Conduit portion can determine its cross-sectional profile by following table.
Conduit elevation profile offsets table in table 3.3 embodiment one
In embodiment, the open-water performance of screw propeller is as shown in Figure 10 (a), and installation site as shown in figure 11.In an embodiment, first conduit portion and its fixing device for installing are installed to unmanned vehicles afterbody, then by the axis hole of oar axle (16) through screw propeller part, screw propeller are installed to unmanned vehicles afterbody simultaneously.When screw propeller is installed, a small amount of gap need be left with unmanned vehicles afterbody, not rub with unmanned vehicles afterbody during to ensure that screw propeller rotates.In addition, the relative position of screw propeller and conduit should be consistent with design point when mounted.These 2 can be ensured by key.Finally hub cap is installed to propeller by oar axle, and fixes (see Figure 11) with bolt of rear end plate.
(2) case two
For certain unmanned vehicles, adopt the present invention as its propelling unit.Its diameter of propeller is 360mm, and the number of sheets is 7 leaves, and screw propeller parameter determined by following table:
Screw propeller geometric element in table 3.4 embodiment two
| Position | Pitch ratio | Skew angle | Trimratio | Chord length ratio | Maximum camber ratio | Maximum ga(u)ge ratio |
| r/R | P/D | θs(°) | X R/D | C/D | f m/C | t m/C |
| 0.2 | 1.05 | -14.7 | 0.002 | 0.190 | 0.0422 | 0.2502 |
| 0.3 | 1.05 | -20.9 | -0.005 | 0.208 | 0.0400 | 0.1943 |
| 0.4 | 1.05 | -21.5 | -0.014 | 0.223 | 0.0363 | 0.1574 |
| 0.5 | 1.05 | -17.7 | -0.026 | 0.234 | 0.0322 | 0.1339 |
| 0.6 | 1.05 | -11.0 | -0.032 | 0.242 | 0.0285 | 0.1148 |
| 0.7 | 1.05 | -3.5 | -0.033 | 0.246 | 0.0252 | 0.0997 |
| 0.8 | 1.05 | 4.2 | -0.033 | 0.243 | 0.0222 | 0.0859 |
| 0.9 | 1.05 | 13.6 | -0.033 | 0.226 | 0.0192 | 0.074 |
| 0.95 | 1.05 | 19.1 | -0.033 | 0.210 | 0.0168 | 0.0702 |
| 0.975 | 1.05 | 21.9 | -0.033 | 0.200 | 0.0138 | 0.0687 |
| 1 | 1.05 | 24.6 | -0.033 | 0.189 | 0.0042 | 0.0672 |
The spatial value of screw propeller geometric shape can be calculated according to formula (1.1).Propeller hub and hub cap profile determined by following table:
Table 3.5 propeller hub and hub cap offsets table
Conduit portion can determine its cross-sectional profile by following table.
Conduit elevation profile offsets table in table 3.5 embodiment two
In embodiment, the open-water performance of screw propeller is as shown in Figure 10 (b).At the mounting means of embodiment two identical with embodiment one (see Figure 11).
Accompanying drawing illustrates:
Seven leaf highly skewed propellers on Fig. 1 submarine.
Fig. 2 seven leaf highly skewed propeller de-noising mechanism.
Fig. 3 conventional manifold screw propeller.
Fig. 4 accelerating type conduit and deceleration type conduit.
The large skew back shrouded propeller of Fig. 5 low noise.
The 3-D view of Fig. 6 screw propeller part.
The difference comparison diagram of the seven leaf highly skewed propellers used in Fig. 7 the present invention and spacious water.
The difference comparison diagram of Fig. 8 the present invention and conventional manifold screw propeller.
Fig. 9 conduit section-drawing.
Figure 10 screw propeller (containing conduit) open-water performance diagram of curves.
Figure 11 low noise large skew back shrouded propeller scheme of installation.
The cylindrical coordinate (x, r, θ) of Figure 12 screw propeller and rectangular coordinate system (x, y, z).
The local coordinate system (ξ, η) that Figure 13 wing profile is relevant.
Claims (6)
1. the large skew back shrouded propeller be made up of highly skewed propeller (1), conduit (2), hub cap (3), wherein highly skewed propeller is made up of blade (4) and propeller hub (5), the axis hole (6) having screw propeller to install in propeller hub and keyway (7).
One of its feature, adopt the array configuration of highly skewed propeller (1) and conduit (2), wherein highly skewed propeller blade (4) number is seven leaves;
Its feature two, adopt highly skewed propeller as the screw propeller part of shrouded propeller, in different radii position, namely radius ratio r/R is in the scope of 0.2 ~ 1.0, and the line style of highly skewed propeller blade (4) is determined by the dimensionless parameter in following span:
(a) pitch ratio P/D: 0.8 ~ 1.4;
(b) skew angle θ s (°) :-25 ~ 40;
(c) trimratio X
r/ D :-0.04 ~ 0.01;
D () chord length is than C/D: 0.10 ~ 0.30;
E () maximum camber compares f
m/ C: 0.01 ~ 0.05;
F () maximum ga(u)ge compares t
m/ C: 0.05 ~ 0.3.
2. large skew back shrouded propeller according to claim 1, is characterized in that: conduit (2) adopts accelerating type conduit (8) or deceleration type conduit (9).
3. large skew back shrouded propeller according to claim 1, is characterized in that: conduit (2) is BD15 accelerating type conduit.
4. large skew back shrouded propeller according to claim 1, is characterized in that: screw propeller hub cap (3) is approximate circle taper.
5. large skew back shrouded propeller according to claim 1, it is characterized in that: highly skewed propeller (1) profile compared with the seven leaf highly skewed propellers used in spacious water (being called for short spacious water seven leaf oar) has difference, blade (4) upper leaf tangent plane chord length C and pitch P are obviously greater than spacious water seven leaf oar, more thrust can be provided on blade top, in the scope that radius ratio r/R is 0.7 ~ 1.0, chord length is 0.18 ~ 0.25, pitch ratio P/D than C/D is 0.8 ~ 1.4.
6. large skew back shrouded propeller according to claim 1, is characterized in that: the screw propeller adopted with existing shrouded propeller has a great difference, mainly contains: (a) number of blade is 7 leaves, and number is more; B () skew angle θ s scope is-25 ° ~ 40 °, skew angle is larger; C () blade line style is different, blade (4) chord length is than C/D in 0.10 ~ 0.50 scope, and scope is larger.
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