突跃型与平滑型斜爆震波起爆机制数值模拟
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摘要
采用带有化学反应的Euler方程,对突跃型与平滑型2种形态的斜爆震波(ODW)在起爆机制和结构特点等方面的差异进行了研究.结果表明:斜激波(OSW)后是否存在亚声速区是判定斜爆震形态的依据.当波后火焰抬升斜激波面使得亚声速区存在时,横向激波与三波点结构就会出现并形成突跃型斜爆震.当波后所有区域皆为超声速区时,波后火焰燃烧无法影响到上游激波面,则会形成平滑型斜爆震.通过斜激波关系式给出了横向激波形成所需的临界斜激波角度,只有当斜激波角度大于此临界角度时才能形成突跃型斜爆震波,反之则形成平滑型斜爆震波.
Euler equations with chemical reaction were used to study the difference in the initiation mechanism and characteristics of saltation and smoothness oblique detonation waves(ODW).The result shows that the criterion which determines the oblique detonation wave configuration is whether a subsonic zone exists behind the oblique shock wave(OSW).If the OSW raised by the flame behind it can lead to the formation of a subsonic zone,the transverse shock wave and triple point would appear and saltation ODW would form.The smoothness ODW would form if all zones are supersonic behind the OSW so the flame can not touch the upriver OSW.The OSW critical angle which leads to the formation of transverse shock wave is calculated from the equations of OSW.When the OSW angle is bigger than this critical angle,saltation ODW would form.otherwise,smoothness ODW would form.
Euler equations with chemical reaction were used to study the difference in the initiation mechanism and characteristics of saltation and smoothness oblique detonation waves(ODW).The result shows that the criterion which determines the oblique detonation wave configuration is whether a subsonic zone exists behind the oblique shock wave(OSW).If the OSW raised by the flame behind it can lead to the formation of a subsonic zone,the transverse shock wave and triple point would appear and saltation ODW would form.The smoothness ODW would form if all zones are supersonic behind the OSW so the flame can not touch the upriver OSW.The OSW critical angle which leads to the formation of transverse shock wave is calculated from the equations of OSW.When the OSW angle is bigger than this critical angle,saltation ODW would form.otherwise,smoothness ODW would form.
引文
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[2]Kailasanath K.Review of propulsion applications of deto-nation waves[J].AIAA Journal,2000,38(9):1698-1708.
[3]Fusina G.Numerical investigation of oblique detonationwaves for shcramjet combustor[D].Toronto:University of Toronto,2003.
[4]Shinichi M,Inada R,Kasahara J,et al.Visualization of the non-steady state oblique detonation wave phenomena a-round hypersonic spherical projectile[J].Proceedings of the Combustion Institute,2011,33(2):2343-2349.
[5]Kasahara J,Aral T,Matsuo A,et al.Experimental investi-gations of steady-state oblique detonation waves generated around hypersonic projectiles[R].AIAA-2001-1800,2001.
[6]Morris C I,Kamel M R,Hansom R K.Shock-induced com-bustion in high-speed wedge flows[C]∥27th Symp.(In-ternational)on Combustion.Boulder:The Combustion In-stitute,1998:2157-2164.
[7]Morris C I,Kamel M R,Ben-Yakar A,et al.Combined schlieren and OH PLIF imaging study of ram accelerator flowfields[R].AIAA-98-0244,1998.
[8]Broda J C.An experimental study of oblique detonation waves[D].Storrs:The University of Connecticut,1993.
[9]林志勇.高静温超声速预混气爆震起爆与发展过程机理研究[D].长沙:国防科学技术大学,2008.LIN Zhiyong.Research on detonation and development mechanisms in elevated temperature supersonic premixed mixture[D].Changsha:National University of Defense Technology,2008.(in Chinese)
[10]王爱峰,赵伟,姜宗林.驻定斜爆震波中横向激波存在与否的判定标准[C]∥第十四届全国激波与激波管学术会议论文集.安徽黄山:中国力学学会激波与激波管专业委员会,2010:230-235.
[11]Choi J Y,Kim D W,In-Seuck J,et al.Cell-like structure of unstable oblique detonation wave from high-resolution nu-merical simulation[J].Proceedings of the Combustion In-stitute,2007,31(2):2473-2480.
[12]Choi J Y.Computational fluid dynamics algorithms for un-steady shock-induced combustion:PartⅠvalidation[J].AIAA Journal,2000,38(7):1179-1187.
[13]Choi J Y,Shin E J R,Cho D R,et al.Onset condition of ob-lique detonation wave cell structures[R].AIAA-2008-1032,2008.
[14]Choi J Y,Jeung I S,Roh T S.Periodical oscillation of com-bustion induced by oblique shock wave[R].AIAA-2002-3717,2002.
[15]刘君,张涵信,高树椿.一种新型的计算化学非平衡流动的解耦方法[J].国防科技大学学报,2000,22(5):19-23.LIU Jun,ZHANG Hanxin,GAO Shuchun.A new uncoup-led method for numerical simulation of nonequilibrium flow[J].Journal of National University of Defense Technolo-gy,2000,22(5):19-23.(in Chinese)
[16]刘世杰,孙明波,林志勇,等.钝头体激波诱导振荡燃烧现象的数值模拟[J].力学学报,2010,42(4):1-10.LIU Shijie,SUN Mingbo,LIN Zhiyong,et al.Numerical research on blunt body shock-induced oscillating combus-tion phenomena[J].Chinese Journal of Theoretical and Applied Mechanics,2010,42(4):1-10.(in Chinese)