高动压激波管中的真实气体效应

Real Gas Effect in the Dynamic-High-Pressure Shock Tube

本文用BWR、M-H,R-K等状态方程和精确的量热关系,计算了在高动压激波管中使用SF_6、CO_2做被驱动气体时的真实气体效应。计算所得的反射激波后的压力P_5明显高于按理想气体所计算的压力。H_2驱动CO_2的实验结果与计算值符合得很好。据此,作者提出了充分利用气体的非完全性来获得高压力增益的新途径。论证了合理选择状态方程的重要性。实验表明H_2驱动CO_2的方案完全适用于高动压的标定。

-In this paper, the real gas effect of CO2, SF, when used as the driven gases in the dynamic-high-pressure shock tube is considered. In addition to including the accurate thermal equations of CO2 and SF6, the equations of state such as BWR, M-H, R-K etc. are tested and compared with each other. The calculated pressures of the reflecting shock waves are much higher than that calculated from the ideal gas assumption. The experiment of H2 driving CO2 accomplished by the authors shows a good agreement with the calculations. These facts enable the authors to indicate a new approach to the dynamic-high-pressure gain in shock tubes i. e. to make use of the imperfectness of the driven gases fully. The importance of choosing properly the equations of state for a reasonable prediction is discussed. The scheme of H2 driving CO2 is shown by the experiment as a promising candidate in the pressure-transducer calibration when using the dynamic-high-pressure shock tubes.