%0 Journal Article
%T 激波管管长对阶跃压力波形的影响分析
%A 杨军
%A 薛斌
%J 振动与冲击
%D 2019
%X 激波管作为动态压力校准装置，其产生的阶跃压力幅值大小，以及平台时间是对阶跃压力进行测量校准的重要指标。本文基于理想情况下，选择管腔内气体介质为空气，通过理论分析得到了使得阶跃平台时间最长的高低压腔长度比优化设计方案。在考虑由实际激波管管腔内的粘性所导致的激波衰减情况时，通过仿真方式对理论结果进行误差分析，得到理想情况下与实际的偏差度。结果表明，在有粘情况下压力幅值随距离增加而逐渐减小，同时入射激波的马赫数在底端面附近呈线性衰减，衰减系数随马赫数增加而增大，而在入射激波马赫数相同时，低压腔越长，底端面附近位置处的衰减系数越小。同时利用仿真结论对实验测量计算马赫数结果进行修正，减小底端面位置处的真实值与实验计算值之间的误差。</br>Abstract：A shock tube is taken as a dynamic pressure calibration device.Its produced step pressure amplitude and platform time are two important indexes for step pressure measurement and calibration.Here, based on the ideal case, air was chosen as gas medium in tub cavity of the shock tube, the design scheme for the optimization of the length ratio between high pressure tub cavity and low pressure one to produce the longest step platform time was obtained through theoretical analysis.Considering the shock wave attenuation case due to viscosity in the actual shock tube, the error analysis was done for the theoretical results through simulation to get the degree of deviation between the ideal case and the actual one.The simulation results showed that in viscous case, the pressure amplitude gradually decreases with increase in distance; at the same time, Mach number of incident shock wave reveals a linear attenuation near the bottom end surface, the attenuation coefficient increases with increase in Mach number; if with the same incident shock wave Mach number, the longer the low pressure tube cavity, the smaller the attenuation coefficient near the bottom end surface.The simulation results were used to modify Mach number obtained in test measurements to reduce the error between the actual value at the bottom end surface and the test calculated one. 
%K 激波管
%K 动态压力校准
%K 阶跃压力
%K 平台时间
%K 管长设计
%K 仿真分析&lt
%K /br&gt
%U http://jvs.sjtu.edu.cn/CN/abstract/abstract8258.shtml