Effective Test Time Evaluation in High-Enthalpy Expansion Tube
Effective Test Time Evaluation in High-Enthalpy Expansion Tube
复制标题
DOI：
10.2514/2.1210
复制
发表时间：
2001
期刊：
影响因子：
2.5
通讯作者：
A. Sasoh;Yasuyuki Ohnishi;Djameel Ramjaun;K. Takayama;H. Otsu;T. Abe
中科院分区：
文献类型：
--
作者：
A. Sasoh;Yasuyuki Ohnishi;Djameel Ramjaun;K. Takayama;H. Otsu;T. Abe
在最近投入使用的膨胀管设备中进行了滞止焓高达37兆焦/千克的流动特性实验。不仅通过静压和皮托压，还通过观察球形头部周围激波层辐射发射的时间变化来确定测试流场的特征和有效持续时间。辐射层的厚度与数值结果吻合良好。加速气体和测试气体之间接触面的到达时间，既可以通过辐射层厚度的减小，也可以通过发射光谱更好地确定。有效测试时间是通过综合上述测量结果来确定的。
Flow characterization experiments of stagnation enthalpies up to 37 MJ/kg are carried out in the recently commissioned expansion tube facility. The features and the effective duration time of the test flowfield are determined not only from static and pitot pressures but also by observing the temporal variation of radiating emission from a shock layer around a spherical forebody. The thickness of the radiating layer matches well with the numerical results. The arrival time of the contact surface between the acceleration and test gases is better identified both as a decrease in the radiating layer thickness and from the emission spectroscopy. The useful test time is determined by integrating the mentioned measurements