某双脉冲发动机压力振荡产生机理及抑制方法分析
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摘要
以某双脉冲发动机二脉冲工作时出现的压力振荡现象为研究对象,建立燃烧室内的声腔和流动模型,采用有限元和大涡模拟算法及声涡耦合机理对压力振荡出现的原因进行了研究,并对采用扰流环抑制压力振荡的原理进行了分析。研究结果表明:该发动机二脉冲工作时出现的压力振荡由声涡耦合引起,在发动机中增加扰流环结构可提高发动机工作初期的漩涡脱落频率,使该频率远离发动机燃烧室声腔的轴向一阶声频,从而抑制压力振荡的发生。
Based on acoustic and flow models of the combustion chamber,this paper studies reasons why pressure oscillation occurs in a double-pulse motor and analyses the mechanism of using the flow-disturbing ring to restrain the oscillation,by utilizing FEM(finite element method),LES(large eddy simulation)and vortex-acoustic coupling mechanism.The results show that the pressure oscillation which happens at the second pulse is caused by vortex-acoustic coupling.Due to the effect of increasing vortex-shedding frequencies,the flow-disturbing ring makes vortex-shedding frequency stay away from that of chamber's first acoustic axial mode,thus preventing the pressure from oscillating.
Based on acoustic and flow models of the combustion chamber,this paper studies reasons why pressure oscillation occurs in a double-pulse motor and analyses the mechanism of using the flow-disturbing ring to restrain the oscillation,by utilizing FEM(finite element method),LES(large eddy simulation)and vortex-acoustic coupling mechanism.The results show that the pressure oscillation which happens at the second pulse is caused by vortex-acoustic coupling.Due to the effect of increasing vortex-shedding frequencies,the flow-disturbing ring makes vortex-shedding frequency stay away from that of chamber's first acoustic axial mode,thus preventing the pressure from oscillating.
引文
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[11]张翔宇,何国强,刘佩进.轴对称后向台阶不稳定流动及压强振荡数值研究[J].固体火箭技术,2012,35(2):171-176,182.
[12]SU W,LI S,ZHANG Q.Influence of thermal inhibitor position and temperature on vortex shedding driven pressure oscillations[J].Chinese Journal of Aeronautics,2013,26(3):544-553.
[13]ZHANG Q,WEI Z,SU W.Theoretical and numerical analysis on thrust oscillation characteristics in solid rocket motors[C]//47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference&Exhibit.[S.l.]:AIAA,2011:5851-5863.
[14]苏万兴,李世鹏,张峤,等.某固体火箭发动机工作末期不稳定燃烧数值研究[J].航空动力学报,2013,28(10):2376-2383.
[15]苏万兴.大长径比固体火箭发动机不稳定燃烧预示及抑制方法研究[D].北京:北京理工大学,2015.
[2]JACOB E,FLANDRO G.Thrust Oscillations in large solid rocket boosters[C]//44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference&Exhibit.Hartford:CT,2008:1-9.
[3]DOTSON K,KOSHIGOE S,PACE K.Vortex shedding in a large solid rocket motor without inhibitors at the segment interfaces[J].Journal of Propulsion and Power,1997,3(2):197-206.
[4]CULICK F,MAGIAWALA K.Excitation of acoustic modes in a chamber by vortex shedding[J].Journal of Sound and Vibration,1979,64(3):455-457.
[5]ANYJOINE J,BUCHLIN J,GUERY J.Experimental and numerical investigations of nozzle geometry effect on the instabilities in solid propellant boosters[C]//44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference&Exhibit.Huntsville.AL:AIAA,2000:3548-3560.
[6]ANTHOINE J,BUCHLIN J,HIRSCHBERG A.Theoretical modeling of the effect of the nozzle cavity volume on the resonance level in large solid rocket motors[C]//AIAA/CEAS Aeroacoustics Conference and Exhibit.Maastricht:AIAA,2001:2091-2102.
[7]TOTH B,LEMA M,ANTHOINE J.Assessment of slag accumulation in solid rocket boosters:part II,two phase flow experiments[C]//42th AIAA/ASME/SAE/ASEE Joint Propulsion Conference&Exhibit.Sacramento:AIAA,2006:4415-4430.
[8]李强,何国强,刘佩进.模型固体火箭发动机内涡脱落过程的大涡模拟[J].推进技术,2005,26(6):481-484.
[9]秦飞,何国强,刘佩进.同轴突扩燃烧室低频不稳定燃烧数值模拟[J].推进技术,2008,29(4):396-400.
[10]陈晓龙,何国强,刘佩进,等.潜入式喷管对燃烧室中压力振荡的影响[J].固体火箭技术,2010,33(3):252-255.
[11]张翔宇,何国强,刘佩进.轴对称后向台阶不稳定流动及压强振荡数值研究[J].固体火箭技术,2012,35(2):171-176,182.
[12]SU W,LI S,ZHANG Q.Influence of thermal inhibitor position and temperature on vortex shedding driven pressure oscillations[J].Chinese Journal of Aeronautics,2013,26(3):544-553.
[13]ZHANG Q,WEI Z,SU W.Theoretical and numerical analysis on thrust oscillation characteristics in solid rocket motors[C]//47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference&Exhibit.[S.l.]:AIAA,2011:5851-5863.
[14]苏万兴,李世鹏,张峤,等.某固体火箭发动机工作末期不稳定燃烧数值研究[J].航空动力学报,2013,28(10):2376-2383.
[15]苏万兴.大长径比固体火箭发动机不稳定燃烧预示及抑制方法研究[D].北京:北京理工大学,2015.