Boundary Layer Effects behind Incident and Reflected Shock Waves in a Shock Tube
Boundary Layer Effects behind Incident and Reflected Shock Waves in a Shock Tube
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激波管中入射和反射激波背后的边界层效应
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Hanson
中科院分区：
文献类型：
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作者：
Sijie Li;Wei Ren;D. Davidson;R. Hanson
在理想激波管实验中，入射激波和反射激波后的流动特性不随距离或时间变化，可以用标准的正激波方程和已知的入射激波速度来计算。然而，非理想效应会导致入射激波后的流动不均匀，进而导致反射激波后的不均匀。已经观察到，在反射激波的背后，压力通常随时间(正dp5/dt)[1-3]逐渐增加。压力(以及随之而来的温度)与理想值的这种偏差会在速率系数和点火延迟时间的化学动力学研究中产生误差[2，3]。因此，有必要分析非理想激波管效应并确定其对流动条件的影响，以改进实验方法和气体动力学模型，从而获得更准确的实验结果。
In ideal shock tube experiments, flow properties behind the incident and reflected shock waves do not vary with distance or time, and can be calculated using the standard normal shock equations and the known incident shock speed. However, nonideal effects result in flow nonuniformity behind the incident shock wave, leading in turn to nonuniformity behind the reflected shock. It has been observed that behind the reflected shock, pressure typically increases gradually with time (positive dP5/dt) [1-3]. Such deviations of pressure (and concomitantly the temperature) from ideal values cause errors in chemical kinetic studies of rate coefficients and ignition delay times [2, 3]. Thus it is worthwhile to analyze nonideal shock tube effects and determine their impact on flow conditions, with a goal of improving experimental methods and gasdynamic models that will lead to more accurate experiments.