激波驱动液体轴对称抛撒的实验研究
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摘要
设计了利用垂直激波管实现液体轴对称抛撒的实验装置,通过高速摄影技术获得不同驱动压力下气液界面不稳定性发展直至发生首次破碎的时间序列。实验结果表明,马赫数的增大导致初始扰动波的波长减小和扰动波数的增加,且尖钉发生破碎并与气流混合的程度更为剧烈。实验液体发生首次破碎的位置基本不随驱动压力的升高而改变。液体前锋的加速度曲线呈现出前期基本不变,后期迅速增大的趋势。
An experimental device for the axisymmetrical dissemination of liquid was set up.Applying the high-speed photography technology,the time series of the instability development at the gas/liquid interface and the primary breakup were recorded.The experimental results show that the increase of Mach number will lead not only to the decrease of the wavelength and the increase of the wave number of initial disturbance waves,but also to the degree of mixing of the spike and airflow.The positions of the primary breakup of the liquid don't change with the increase of the shock wave.The acceleration of the liquid front remains unchanged in the earlier stage and rises rapidly in the later stage.
An experimental device for the axisymmetrical dissemination of liquid was set up.Applying the high-speed photography technology,the time series of the instability development at the gas/liquid interface and the primary breakup were recorded.The experimental results show that the increase of Mach number will lead not only to the decrease of the wavelength and the increase of the wave number of initial disturbance waves,but also to the degree of mixing of the spike and airflow.The positions of the primary breakup of the liquid don't change with the increase of the shock wave.The acceleration of the liquid front remains unchanged in the earlier stage and rises rapidly in the later stage.
引文
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[2]Gardner D R.Near-field dispersal modeling for liquid Fuel-AirExplosive[R].Sandia National Laboratories Report,SAND-90-0686,1990.
[3]Gardner D R,Glass M W.A coupled near-field,far-field dispersal model for Fuel-Air-Explosives[R].Sandia National Laboratories Report,SAND-90-0687,1991.
[4]施红辉,岸本熏实.瞬态加速液柱的流体力学问题研究[J].爆炸与冲击,2003,23(5):391-397.Shi H H,Kishimoto M.Fluid mechanics in the transient acceleration of a liquid column[J].Explosion and Shock Waves,2003,23(5):391-397.
[5]施红辉,卓启威.Richtmyer-Meshkov不稳定性流体混合区发展的实验研究[J].力学学报,2007,39(3):417-421.Shi H H,Zhuo Q W.Evolution of the fluid mixing zone in richtmyer-meshkov instability at a gas/liquid interface[J].Chinese Journal of Theoretical and Applied Mechanics,2007,39(3):417-421.
[6]邹立勇,王建,刘金宏,等.高压气体膨胀驱动Air-Water界面Rayleigh-Taylor不稳定性实验研究[J].高能量密度物理,2008,2:49-53.
[7]黄文斌,邹立勇,刘金宏,等.初始扰动对于气液界面Rayleigh-Taylor不稳定性发展的影响[J].实验流体力学,2010,24(3):39-41.Huang W B,Zou L Y,Liu J H,et al.Effects of initial perturbations on Rayleigh-Taylor instability growth at gas-liquid interface[J].Journal of Experiments in Fluid Mechanics,2010,24(3):39-41.
[8]李磊,崔箭,董玉才,等.液体爆炸分散过程中界面破碎的实验研究[J].科学通报,2009,54(12):1693-1700.Li L,Cui J,Dong Y C,et al.Experimental investigations to the interfaces breakup during liquid explosive disseminations process[J].Chinese SciBull,2009,54(12):1693-1700.
[9]任晓冰,李磊,严晓芳,等.液体的爆炸抛撒特征[J].爆炸与冲击,2010,30(5):487-492.Ren X B,Li L,Yan X F,et al.Dispersion characters of liquid induced by explosion[J].Explosion and Shock Waves,2010,30(5):487-492.
[10]Richtmyer R D.Taylor instability in shock acceleration of compressible fluids[J].Commun Pure App Math,1960,13:297-319.