21303 Measurement of Strength of Shock wave Propagating in Tube

In this paper, Mach number of shock wave propagating in a pipe is estimated by techniques using an average velocity of shock, a pressure history, etc., and these results are compared to each other. Mach number obtained from average velocity of the shock propagating between two stations along the pipe is underestimated. In order to get the pressure jump across the shock, the pressure history using a pressure transducer is in general filtered, so that the shock wave is smeared out and it is difficult to evaluate a local Mach number at a certain station. A dynamic characteristic of the pressure transducer is examined and a step response of pressure is utilized to obtain the local Mach number.