抄録
The free piston shock tunnel (FPST) has been intensively used for simulation of the atomospheric re-entry of space vehicles and also for the development of scram jet engines. However, the characteristics of FPST is basically determined by the piston motion in its compression tube. Hence, in order to analyze it, various techniques have been proposed experimentally and analytically for its optimization. In its optimization, it is always a technical problem to measure piston speed along its compression tube continuously, particularly and with higher-resolution. In this study, firstly, piston speed inside a 50mm dia. and 2m long compression tube was measured continuously and accurately by using a piston motion velocity interferometer (PMVI), which was developed particularly to measure a piston speed inside a compression tube. The results of its performance are described.
