TEST TIME IN LOW PRESSURE SHOCK TUBES
TEST TIME IN LOW PRESSURE SHOCK TUBES
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DOI：
10.1063/1.1706887
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发表时间：
1963-09
影响因子：
4.6
通讯作者：
H. Mirels
中科院分区：
文献类型：
--
作者：
H. Mirels
分析研究了层流壁边界层对低压激波管试验时间的影响。在Roshko和Hooker以前的研究中，流动是在接触面固定坐标系中考虑的。在本研究中，假设激波以匀速运动，并在激波固定坐标系中研究流动。与以往的研究不同，该方法考虑了激波与接触面之间自由流条件的变化。结果表明，除极强激波外，Roshko定义的参数β比Roshko和Hooker的估计值要大得多。由于测试时间与β−2成正比，之前对测试时间的估计过大，特别是对弱冲击。对于激波马赫数大于5的激波马赫数，目前对β的估计似乎与现有的实验数据在10%以内。在其他方面，基本理论与Roshko以前的结果大体一致。
The reduction of test time in low pressure shock tubes, due to a laminar wall boundary layer, has been analytically investigated. In previous studies by Roshko and Hooker the flow was considered in a contact surface fixed coordinate system. In the present study it was assumed that the shock moves with uniform velocity, and the flow was investigated in a shock fixed coordinate system. Unlike the previous studies, the variation of free stream conditions between the shock and contact surface was taken into account. It was found that β, a parameter defined by Roshko, is considerably larger than the estimates made by Roshko and Hooker except for very strong shocks. Since test time is proportional to β−2, previous estimates of test time are too large, particularly for weak shocks. The present estimates for β appear to agree with existing experimental data to within about 10 percent for shock Mach numbers greater than 5. In other respects, the basic theory is in general agreement with the previous results of Roshko.