CN102226533A - High-speed premixed flame furnace for supersonic burning research - Google Patents
High-speed premixed flame furnace for supersonic burning research Download PDFInfo
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Abstract
The invention relates to a high-speed premixed flame furnace for supersonic burning research. The high-speed premixed flame furnace comprises a main stream mixing chamber (5), a supersonic nozzle (8), a wake plenum chamber (6) and a low-speed nozzle (7), wherein the whole high-speed premixed flame furnace is of a streamline structure with two smaller ends and one larger middle; the high-speed premixed flame furnace is equally divided into two parts lengthways, namely a supersonic main stream side and a sub-sound velocity wake side; the main stream mixing chamber (5) and the supersonic nozzle (8) are positioned on the supersonic main stream side; and the wake plenum chamber (6) and the low-speed nozzle (7) are positioned on the sub-sound velocity wake side. The premixed flame furnace provided by the invention has the advantages of compact structure, simple processing technique, low test cost, short test period, accurate and adjustable premix equivalent ratio large range, large total temperature, total pressure and airflow mach number adjustable range and the like.
Description
Technical field
The present invention relates to be applied to the experimental rig of the air suction type supersonic speed combustion engine research of Aeronautics and Astronautics, can be research supersonic speed premixed combustion process, flame structure, steady flame mechanism and mixed supersonic grate firing burning process etc. experimental condition is provided.。
Background technology
Empty day advantage is to win the strategic high ground of triumph under the future high-tech war condition, and is significant to guaranteeing national security and international status.The scramjet engine technology relates to multi-door subject as the binding site of aeronautical and space technology, is the high integrity of multinomial cutting edge technology, is the topmost alternative power of sky and space plane, hypersonic aircraft and hypersonic cruise missile.The course of work is very complicated in the scramjet engine combustion chamber, relate to fuel under the supersonic speed condition injection, penetrate, mix, igniting, flame stabilization, shock wave and a series of challenges such as boundary-layer and mutual interference mutually, free shear layer and development thereof.Problems such as the igniting of fuel, flame stabilization and flame propagation particularly and since the supersonic speed burning wayward with observation, its Study on Combustion Process difficulty is very big.
High speed premixed flame stove can provide the supersonic speed combustion process for experimental study in open air ambient, and the physical model checking of burning for supersonic speed provides foundation.Advantages such as have easy and simple to handlely, multi-parameter is controllable, and experimental period is long.
Also do not carry out the experimental provision of the igniting of supersonic speed premix, flame stabilization and flame propagation research at present both at home and abroad.The experimental provision that carries out the non-premixed combustion research of supersonic speed has document " Supersonic combustion research at NASA " (2007 Fall Technical Meeting Eastern States Section of the Combustion Institute University of Virginia Oct
Aspect low speed premixed combustion research, existing experimental provision has document " A flat flame burner for the calibration of laser thermometry techniques " (MEASUREMENT SCIENCE AND TECHNOLOGY, 17 (2006) 2485-2493) the premix flat flame stove of introducing by Cambridge University's department of chemistry engineering development, this flame furnace adopts the axial symmetry design, main flow is coaxial aperture jet flow with wake, main flow area diameter 40mm maximum stream flow is 36L/min, wake district external diameter is 62mm, internal diameter is 42mm, the main flow area design is used to prevent the passback of low speed premix gas flame with the hole of 2335 diameters 0.5, the hole of 2696 diameters 0.5 of wake district design.The equivalent area of main flow area is 458.2mm
2, the wake equivalent area is 529mm
2The orifice plate shape boiler face that main flow and wake are all made through brass enters the atmosphere of open environment, and is lighted in order to the influence of observation different fuel equivalent proportion to combustion process at this.Therefore because the stone or metal plate for standing a stove on as a precaution against fire surface is close in burning, need cool off stone or metal plate for standing a stove on as a precaution against fire, at stone or metal plate for standing a stove on as a precaution against fire periphery wall scroll cooling pipe, in order to the stone or metal plate for standing a stove on as a precaution against fire surface cooling.This experimental provision complex structure, very high to the processing technology requirement, material expensive.Because cooling water designs at the stone or metal plate for standing a stove on as a precaution against fire edge, cooling capacity is limited, has shortened the service life of flame furnace to a great extent simultaneously.The axial symmetry low pressure premix flat flame stove that the Tel Aviv, Israel university chemistry institute that another kind of design has document " Laser diagnostics of trace species in low-pressure flat flame " (Progress in Energy and Combustion Science 35 (2009) 365-382) to introduce develops, main flow and wake are also adopted coaxial design, main flow area diameter 60mm, air velocity is lower than flame spread speed.For preventing the tempering of premix gas, the stone or metal plate for standing a stove on as a precaution against fire face adopts special bronze porous material (metallurgical powder) to make, and for reducing furnace surface temperature, the cooling water pipeline founding has fabulous cooling effect effectively to reduce furnace surface temperature in this stone or metal plate for standing a stove on as a precaution against fire, prevents premixed gas detonation in the stove.Though this device structure is simple relatively, the preparation relative complex costliness of boiler face material.
Low speed low-pressure section premixed combustion research aspect, the current experiments device has document " Demonstration of a burner for the investigation of partially premixed low-temperature flames " (Combustion and Flame, 2010:02,002) Germany of Jie Shaoing is than the partly-premixed low pressure flat flame stove of reining in the development of Field university chemistry institute, this flame furnace adopts the hexagonal symmetry design, hexagonal side length is 15mm, by adjustments of gas Flow-rate adjustment air stream outlet speed.This partly-premixed flame furnace adopts the method for designing of oxidant and fuel shunting, fuel does not mix in stove with oxidant, oxidant enters the low-pressure experiment cabin by the hole of 306 diameters 0.5 of boiler face, fuel then enters Laboratory Module by the stainless steel tube of 91 internal diameter 0.5mm, form 91 bundle diffusion flames at the fuel outlet place, be fused into independent flame then with approximate one-dimensional characteristic.Also there is complex structure in this experimental provision, and is very high to the processing technology requirement, shortcomings such as material expensive.
From the above supersonic speed flame furnace of enumerating and low speed premixed flame stove as can be known, will be designed for the experimental provision of combustion processes such as igniting, flame stabilization and flame propagation of the supersonic speed premix of research at present, promptly supersonic speed premixed flame stove need improve in the following aspects:
1. appropriate design flame furnace jet pipe provides supersonic speed premix gas
2. suitably improve premix gas total enthalpy
3. premix gas equivalent proportion is accurately adjustable on a large scale
4. premix gas mixing uniformity is good
5. prevent effectively that premix gas from entering the preceding appearance of experimental section and catching fire in advance
6. effectively prevent the flame furnace tempering
The supersonic speed premixed combustion flame furnace of the employing premix pneumoelectric heat protocol of the present invention's design can effectively improve as Fig. 1 at above several respects, and has a compact conformation, processing technology is easy, experimentation cost is low, test period is short, plurality of advantages such as the premix equivalent proportion is accurately adjustable on a large scale, and stagnation temperature, stagnation pressure and gasflow mach number adjustable range are big.
Summary of the invention
The object of the invention: the design feature of comprehensive above-mentioned supersonic speed flame furnace and low speed premixed flame stove, in conjunction with the experiment demand of the igniting of supersonic speed combustion process, flame stabilization and flame propagation research, develop and to produce the good premix supersonic speed combustion flame stove of mixing uniformity.
Technical scheme of the present invention is: the present invention is the flame furnace device that is used for supersonic speed combustion ignition, flame stabilization and the research of flame propagation process experiment.This high speed premixed flame stove comprises that main flow mixing chamber 5, supersonic nozzle 8, wake stay major parts such as chamber 6, slow-running jet tube 7.Whole ultrasonic speed premixed flame stove is a streamlined structure broad in the middle small in ends, longitudinally, be equally divided into two parts, a part is a supersonic speed main flow side, another part is a subsonic speed wake side, main flow mixing chamber 5, supersonic nozzle 8 are positioned at supersonic speed main flow side, and wake is stayed chamber 6, slow-running jet tube 7 is positioned at subsonic speed wake side.
The supersonic speed main flow side of supersonic speed premixed combustion flame furnace adopts methane and air or methane and oxygen oxygen enrichment premix scheme, and subsonic speed wake side adopts pure methane, pure hydrogen or methane and the rich combustion of air premix scheme.In mixing chamber, oxidant and fuel insert mixing chamber by triplate line, and mixing chamber adopts airflow design, can effectively avoid the interior flow dead that is caused by the recirculating zone of mixing chamber, have guaranteed effective blending of fuel.Air-flow reduces rapidly in the expansion area speed of inlet, the ceramic heating element of flowing through mainly carries out heat exchange in the mode of heat convection, the gaseous mixture stagnation temperature raises, assurance mixed airflow static temperature after jet pipe quickens is not too low, the supersonic speed igniting can be realized reliably, and the more real air suction type scramjet engine course of work can be simulated.Common metallic resistance heater element generally needed 4-5 minute just can reach hot face temperature, and its thermal inertia is also bigger, and metapyretic electrothermal tube is its surface temperature 10-20% that still can rise under the insulation off-position, was difficult to accurately its temperature of control.This supersonic speed premixed flame stove adopts the ceramic-like electrical heating element with characteristics such as power density are big, high temperature resistant, the response that heats up is fast, thermal inertia is little, can heat up rapidly, effectively temperature control.Temperature-controlled cabinet adopts ghyristor circuit system and digital indicator to form, and is quick on the draw, and control accurately.
Adopt netted dividing plate that bead is installed in the mixing chamber, because the effect that prevents the tempering of premix gas can effectively be played less than the premix gas quencher limit in the gap between the bead.Air-flow flows through from the gap between the bead simultaneously, and being disturbed effectively to strengthen mixing.
In order to guarantee that nozzle exit has quality supersonic speed premix gas preferably, so that research flow field disturbance is installed damping screen to the influence of supersonic speed igniting and flame stabilization at the jet pipe front end.Because air communication overdamp net can produce bigger pressure drop on the air current flow direction,, thereby air-flow uniformity of its flow direction VELOCITY DISTRIBUTION after by damping screen is significantly improved so its pressure drop of higher relatively speed of incoming flow is also relatively large.
Because designed supersonic speed premixed flame stove is mainly used in the two-dimensional characteristics of research supersonic speed premix gas ignition, therefore flame furnace outlet profile is a rectangle, and streamlined mixing chamber is semicircular structure after contraction, therefore designed round commentaries on classics square structure at mixing chamber outlet, effectively with quality preferably the premix conductance go into the supersonic speed jet pipe.Supersonic nozzle adopts the two-dimensional design method, according to the characteristic curve principle, promptly the jet pipe profile is divided into unlimited many broken lines according to limit theory, angle is infinitely small between line segment, require the dilatational wave compressional wave counteracting of the section of being terminated generation fully of the initial segment generation of jet pipe expansion segment, so just can obtain the uniform supersonic flow field of quality at nozzle exit.Consider the influence of fluid viscosity in the design, estimated jet pipe wall development of boundary layer, revised the bit stream curve, eliminated the boundary layer Influence and Development.Jet pipe and mixing chamber are designed to replaceable structure, can realize changing the supersonic speed burning condition of this flame furnace by changing nozzle component, as parameters such as premix gas Ma number, static temperature, static pressure.
The AND DEWATERING FOR ORIFICE STRUCTURE that the wake designs of nozzles becomes can assign can change the distance between supersonic speed main flow and the low speed wake easily, studies this distance to the stable influence of supersonic speed combustion flame.Because the phenomenon of flame passback easily takes place low speed premix air-capacitor, and the design of this orifice plate can be effectively fire-retardant, its aperture is much smaller than the premix gas quencher limit simultaneously.This orifice plate can also play the effect of honeycomb, promptly leads and cuts apart Maelstrom, improves the air stream outlet quality.
Can control fuel ratio according to the research needs accurately by the quality of regulation flow controller in the experiment, realize that premix gas equivalent proportion is adjustable on a large scale.Accurately control premix temperature degree by electric heater.Regulate the supersonic speed premix gas outlet Mach number of main flow by changing nozzle component, regulate the wake muzzle velocity by regulating flow controller.Because experimental section directly is placed in the atmospheric environment, the flame furnace outlet pressure is designed to an atmospheric pressure, wave system occurs to reduce in the supersonic flow of experiment.
The course of work of the present invention is:
In supersonic speed premix side: with the methane of proper proportion and the mist of air or methane and oxygen, enter super combustion premixed flame stove mixing chamber by triplate line with mass flow controller.Premixed flow is crossed and can be responded fast, the electric-heating ceramic heater of accurate temperature controlling, can obtain the above premix gas of stagnation temperature adjustable range 300-700K, stagnation pressure 0.24MPa.Mixing can be effectively promoted in slit between the airflow passes bead subsequently, and prevents that the generation of the boundary layer tempering or the tempering of cut-offfing from appearring in the supersonic speed premix gas of lighting in the downstream.In the downstream, air communication overdamp net carries out rectification, obtains flow field quality premix gas preferably.At last by the acceleration of replaceable supersonic nozzle, can be the supersonic speed combustion process Mach number more than 1.2, supersonic speed premix gas that stagnation temperature 300-700K is adjustable are provided.In flame furnace premix gas outlet appropriate location the adjustable high-energy sparking plug of energy is installed, the ignition problem in the research supersonic speed premix gas is probed into the influence to the supersonic speed premixed flow igniting of different equivalent proportions of premix gas stagnation temperature and ignition energy.
In subsonic speed wake side:, introduce the low speed side mixing chamber by pipeline with methane and the air gas mixture or the pure methane (also can be pure hydrogen) of mass flow controller with proper proportion.Adopt the electric-heating ceramic heater equally, can obtain the premix gas of stagnation temperature scope 300-700K, stagnation pressure scope 0.1-0.15MPa.Since at low speed side, the easier generation of premix gas tempering phenomenon.Therefore except adopting bead to prevent the tempering, designed replaceable orifice plate at low speed premix gas outlet, adopt the hole of 204 dark 6mm of diameter 0.5mm that the premix conductance is gone out, on the one hand injection diameter can effectively prevent the tempering of low speed premix gas much smaller than the quencher limit of premix gas when 293K (the quencher limit of CH4 and air be 2.5mm).Nozzle array can effectively lead and cut apart air-flow large scale vortex on the other hand, helps accelerating the decay of vortex; And the orifice plate pipeline helps improving the VELOCITY DISTRIBUTION of air-flow to the rubbing action of air-flow, and reduces the turbulivity of air-flow to a certain extent.By designing different hole arrays, regulate the spacing between low speed flow and the supersonic speed main flow, can study flame stabiliser in the supersonic speed premix gas.Low speed flow has good firing characteristic,, can light a fire the communication process of research flame in supersonic flow in low speed premix gas one side for the bigger experiment condition of main flow Mach number.
The present invention is applicable to igniting, flame stabilization and the flame propagation process in the adjustable supersonic speed premix gas of research equivalent proportion.And the synergetical principle of supersonic speed premix gas and the ignition of low speed premix gas.
Adopt the present invention can reach following technique effect:
1, the present invention adopts mass flow controller can control gas flow accurately, realizes that the accurate control of equivalent proportion reaches adjustable on a large scale.Significantly improved the control ability that premix gas equivalent proportion is regulated, can effectively study equivalent proportion the igniting of supersonic speed premix gas and the influence of flame stabilization and propagation.
2, the present invention adopts the electrothermal ceramic heater, can respond fast, accurate temperature controlling, can realize the accurate control to supersonic speed premix temperature degree, can effectively study the influence of gas flow temperature to igniting of supersonic speed premix gas and flame propagation process.Adopt the adjustable high-energy sparking plug of energy to the igniting of premix gas, can effectively study the coupling of ignition energy, gas flow temperature supersonic speed premix gas ignition process.
3, the present invention adopts replaceable nozzle structure, can easily regulate supersonic speed premixed flow Mach number, can effectively study the influence of air velocity to the igniting of supersonic speed premix gas, flame stabilization and communication process.The low speed side air velocity is accurately regulated by mass flow controller, can study between main flow and wake relative Mach number to the influence of two bursts of air-flow mixed processes, thereby effectively studies the flame propagation process under the supersonic speed condition.
4, the present invention adopts replaceable orifice fitting to regulate distance between main flow and the wake, can effectively study between two strands of air-flows recirculating zone size and VELOCITY DISTRIBUTION to the influence of supersonic speed flame stabilization.By regulating the equivalent proportion between main flow and the wake, the research fuel element distributes to the influence of supersonic speed flame propagation process simultaneously.
5, to adopt orifice plate and bead to carry out effectively fire-retardant in the present invention, significantly improved the security and the reliability of system.Before outlet, design damping screen, effectively improved flame furnace exit flow quality, reduced the influence of mobile interference the supersonic speed combustion process.
Description of drawings
The supersonic speed burning premixed flame furnace accretion composition of Fig. 1 the present invention design
Fig. 2 supersonic nozzle structure chart
Fig. 3 supersonic nozzle structural representation
The replaceable AND DEWATERING FOR ORIFICE STRUCTURE figure of Fig. 4
The replaceable AND DEWATERING FOR ORIFICE STRUCTURE cutaway view of Fig. 5
The specific embodiment
Fig. 1 is the supersonic speed premixed flame stove that the present invention designs, comprise that main flow mixing chamber 5, supersonic nozzle 8, wake stay chamber 6, slow-running jet tube 7, wherein whole ultrasonic speed premixed flame stove is a streamlined structure broad in the middle small in ends, longitudinally, be equally divided into two parts, a part is a supersonic speed main flow side, and another part is a subsonic speed wake side, main flow mixing chamber 5, supersonic nozzle 8 are positioned at supersonic speed main flow side, and wake is stayed chamber 6, slow-running jet tube 7 is positioned at subsonic speed wake side.
Wherein in supersonic speed main flow side, the porch of main flow mixing chamber 5 connects three ventilating methane pipelines 4 and three blowing airs or purity oxygen pipeline 3, the exit connects supersonic nozzle 8, exports from entering the mouth in main flow mixing chamber 5 and is provided with electrothermal ceramic heater 12, anti-backfire interlayer 10, damping screen 9 successively.
Fuel methane and air or methane and oxygen enter main flow mixing chamber 5 by pipeline, and the air-flow electrothermal ceramic heater 12 of flowing through earlier obtains higher stagnation temperature.After passing through anti-backfire interlayer 10 and damping screen 9, supersonic nozzle 8 successively, ejection.
This electrothermal ceramic heater 12 adopts ghyristor circuit systems, and the response time is short, thermal inertia is little, can heat up rapidly, accurate temperature controlling, regulates premix gas stagnation temperature and changes in the 300-700K scope, in order to the influence of research gas flow temperature to the igniting of supersonic speed premix gas.The burning of supersonic speed premix gas does not generally have tempering phenomenon and takes place, but air velocity is reduced to subsonic speed when cut-offfing, and tempering very likely takes place, and causes the pipeline blast, therefore in main flow mixing chamber 5, design anti-backfire interlayer 10, put bead on the anti-backfire interlayer 10.Anti-backfire interlayer 10 is netted dividing plate.Owing to the quencher limit of bead gap less than methane and air, the generation of tempering phenomenon when this device can effectively prevent the deceleration of premix gas.For improving the mobile quality of nozzle exit supersonic speed premix gas, damping screen 9 is installed in jet pipe upstream, bead downstream.Damping screen 9 can effectively cut the large scale whirlpool, reduces the flow turbulence degree, make simultaneously air-flow the flow direction velocity distribution uniformity be improved significantly.Be the two-dimensional characteristics of research supersonic speed premix gas ignition, the supersonic nozzle 8 of this device adopts two dimensional character line design principle, has considered the influence of fluid viscosity, and jet pipe wall boundary layer is revised, and has guaranteed the nozzle exit flow quality.The adjustable high-energy sparking plug of energy is installed, by regulating of the influence of spark plug discharge energy research ignition energy to supersonic speed premix gas firing characteristic in the nozzle exit appropriate location.
In subsonic speed wake side, wake connects threeway pure methane or pure hydrogen pipeline 2, threeway air pipe line 1 in the porch of chamber 6, the exit connects slow-running jet tube 7, in wake is stayed chamber 6, be provided with electrothermal ceramic heater 12, anti-backfire interlayer 10, damping screen 9 successively, be provided with anti-backfire orifice plate 11 at the port of export of slow-running jet tube 7.
Fuel pure methane (also can adopt pure hydrogen) or fuel methane and Air mixing gas enter wake by pipeline and stay chamber 6, and suitably improve stagnation temperature through electrothermal ceramic heater 12.Pass through anti-backfire interlayer 10, damping screen 9 successively, behind slow-running jet tube 7, the anti-backfire orifice plate 11, ejection.
Because premix gas is easy to tempering in the subsonic speed air-flow, therefore behind ceramic heater, be provided with anti-backfire interlayer 10, on put bead.Subsonic speed companion side bead diameter is less than supersonic speed main flow side bead diameter.Damping screen 9 is installed equally in bead interlayer downstream is improved flow quality.Because the flame passback easily takes place low speed premix gas, the port of export of staying the slow-running jet tube 7 of chamber at the subsonic speed wake is provided with anti-backfire orifice plate 11.As Fig. 2, this anti-backfire orifice plate is the replaceable plug-in unit that high temperature alloy is made, and can adjust the distance between main flow and wake by adjusting the distance of outmost turns hole to the edge.The uniform a plurality of diameter 0.5mm of this orifice plate, the aperture of dark 6mm, the hole is that 60 ° of annulars are arranged.Because the effect that prevents the tempering of low speed premixed flow much smaller than the quencher limit of CH4 and air pre-mixing gas, therefore can well be played in the aperture, this orifice plate has the effect of similar honeycomb simultaneously, can lead and cut apart the large scale whirlpool, improves the air stream outlet quality.
Fig. 4 is the replaceable AND DEWATERING FOR ORIFICE STRUCTURE figure that the present invention develops flame furnace.Removable anti-backfire orifice plate 11 is installed in subsonic speed companion effluent exit.Design a plurality of different structure orifice plates, change the distance of cycle hole, change the spacing of supersonic speed main flow side and subsonic speed wake side to the orifice plate edge by adopting.This spacing plays the effect of flame stabilization, adjust this distance in order to study flow between the recirculating zone size to the influence of chemical reaction group and flame stabilization.This jet pipe profile 13 adopts method of characteristic curves design, because jet pipe profile stream field quality and air stream outlet speed are most important, add and adopt man-hour bigger material to process jet pipe profile 13 earlier with wire cutting technology, adopt the little laser welding technology of welding deformation with jet pipe cover plate 15 and nozzle tube 14 welding then, cut out the jet pipe base again after welding is finished.This work flow adopts elder generation's soldering blow tube cover plate on the high massive material of structural strength to cut the technology of nozzle contour again, has guaranteed that the jet pipe distortion is as much as possible little in the welding process.
Flame furnace outlet profile is a rectangle, and streamlined mixing chamber is semicircular structure after contraction, and the mixing chamber outlet place changes square structure for circle.Can be effectively with quality preferably the premix conductance go into the supersonic speed jet pipe.
Claims (7)
1. high speed premixed flame stove that is used for the supersonic speed combustion research, comprise that main flow mixing chamber (5), supersonic nozzle (8), wake stay chamber (6), slow-running jet tube (7), it is characterized in that, whole ultrasonic speed premixed flame stove is a streamlined structure broad in the middle small in ends, longitudinally, be equally divided into two parts, a part is a supersonic speed main flow side, another part is a subsonic speed wake side, main flow mixing chamber (5), supersonic nozzle (8) are positioned at supersonic speed main flow side, and wake is stayed chamber (6), slow-running jet tube (7) is positioned at subsonic speed wake side.
2. a kind of high speed premixed flame stove that is used for the supersonic speed combustion research according to claim 1, it is characterized in that, in supersonic speed main flow side, the porch of main flow mixing chamber (5) connects three ventilating methane pipelines (4) and three blowing airs or purity oxygen pipeline (3), the exit connects supersonic nozzle (8), exports from entering the mouth in main flow mixing chamber (5) and is provided with electrothermal ceramic heater (12), anti-backfire interlayer (10), damping screen (9) successively.
3. a kind of high speed premixed flame stove that is used for the supersonic speed combustion research according to claim 1, it is characterized in that, in subsonic speed wake side, wake connects threeway pure methane or pure hydrogen pipeline (1), threeway air pipe line two (1) in the porch of chamber (6), the exit connects slow-running jet tube (7), stay chamber (6) at wake and be provided with electrothermal ceramic heater (12), anti-backfire interlayer (10), damping screen (9) successively in exporting from entering the mouth to, be provided with anti-backfire orifice plate (11) at the port of export of slow-running jet tube (7).
4. a kind of high speed premixed flame stove that is used for the supersonic speed combustion research according to claim 1 is characterized in that, supersonic speed main flow side adopts methane and air or methane and oxygen oxygen enrichment premix scheme; Subsonic speed wake side adopts pure methane or pure hydrogen or methane and the rich combustion of air premix scheme.
5. a kind of high speed premixed flame stove that is used for the supersonic speed combustion research according to claim 1 is characterized in that the anti-backfire interlayer is put bead on (10), and anti-backfire interlayer (10) is netted dividing plate.
6. a kind of high speed premixed flame stove that is used for the supersonic speed combustion research according to claim 1, it is characterized in that, the replaceable plug-in unit that anti-backfire orifice plate (11) is made for high temperature alloy can be adjusted the distance between main flow and wake by adjusting the distance of outmost turns hole to the edge.
7. a kind of high speed premixed flame stove that is used for the supersonic speed combustion research according to claim 1 is characterized in that, flame furnace outlet profile is a rectangle, and streamlined mixing chamber is semicircular structure after contraction, and the mixing chamber outlet place changes square structure for circle.
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| CN115654497A (en) * | 2022-11-01 | 2023-01-31 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Method for building ultra-high temperature stable laminar combustion environment |
| CN115654497B (en) * | 2022-11-01 | 2023-09-08 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Construction method of ultra-high temperature stable laminar flow combustion environment |
| CN117007274A (en) * | 2023-10-07 | 2023-11-07 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Subsonic wind tunnel loop mass flow measurement method |
| CN117007274B (en) * | 2023-10-07 | 2023-12-29 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Subsonic wind tunnel loop mass flow measurement method |
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