Influence of diaphragm opening time on shock-tube flows
Influence of diaphragm opening time on shock-tube flows
复制标题
隔膜打开时间对激波管流量的影响
DOI：
--
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发表时间：
1958
影响因子：
3.7
通讯作者：
D. White
中科院分区：
文献类型：
--
作者：
D. White
当使用足够大的隔膜压力比时，通过使用氢或氦作为驱动气体和使用空气、氮、氧或氩作为驱动气体在激波管中产生的激波具有比通过简单理论预测的更高的速度。对于激波管流动的通常模型（假定瞬时膜片移除）和基于膜片有限破裂时间的建议模型，使用驱动气体的平衡Hugoniot，已经建立了预期的激波管性能曲线。实验和后一模型之间的一致性总体上是良好的，并且通过预期由驱动气体和被驱动气体之间在接触表面处的混合产生的压力波定性地解释了差异。这些波可以是压缩波或膨胀波，这取决于两种气体的相对热容。当激波沿管向下时，观察到的最大激波强度出现在离隔板一定距离处，该距离随激波强度的增加而增加，最强的激波在42英尺管的末端仍在加速。3 1/2英寸长的激波管正方形横截面。隔膜破裂时间已被测量，并发现是一致的冲击波形成距离的观察。
Shock waves generated in a shock tube by use of hydrogen or helium as a driver gas and air, nitrogen, oxygen or argon as a driven gas have higher velocities than predicted by simple theory when sufficiently large diaphragm pressure ratios are used. Expected shock-tube performance curves have been constructed using the equilibrium Hugoniot for the driven gas, both for the usual model of shock tube flow, which assumes instantaneous diaphragm removal, and for a suggested model based on a finite rupture time for the diaphragm. Agreement between experiment and the latter model is in general good, and the differences are qualitatively accounted for by the pressure waves expected to result from mixing between driver and driven gases at the contact surface. These waves may be either compression or expansion waves, depending on the relative heat capacities of the two gases. The maximum shock strength observed as a shock goes down the tube was found to occur at a distance from the diaphragm which increases with the shock strength, and the strongest shocks were found to be still accelerating at the end of a 42 ft. long shock tube of 3 1/2 in. square cross-section. Diaphragm breaking time has been measured and found to be consistent with the observations on the shock formation distance.