圧力変換器を用いた衝撃波伝播方向推定の一方法について

抄録

In recent years, with the improvement of technology, the Shinkansen have become faster and the performance in the intake and exhaust systems of automobiles have been remarkably developed. On the other hand, shock waves generated by high-speed flow in bullet trains when they pass through tunnels and inside the intake and exhaust systems are expected to have various adverse effects. Therefore, it is essential to measure the strength and propagation direction of shock waves to improve equipment performance. In this study, we measured the direction of propagation of shock waves under conditions that anticipate internal flow, such as in a turbo machinery. The sensor used in this study is a diaphragm type pressure sensor with a strain gauge attached to the inner surface of the pressure-sensitive portion. Based on the pressure history of this pressure sensor, rosette analysis was performed, and the results were compared and discussed under two conditions, one in stationary fluid and another in flowing fluid.