Effects of shock tube length on step pressure waveform
YANG Jun1,2,XUE Bin1
1.Beijing Changcheng Metrology and Measurement Research Institute, Beijing 100095, China;
2.School of Instrument Science and Optoelectronic Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100191, China
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.
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