MEASUREMENT OF DELAY TIME FROM PROPELLANT IGNITION TO PROJECTILE LAUNCH IN TWO-STAGE LIGHT GAS GUN USING ELECTROTHERMAL-CHEMICAL GUN TECHNOLOGY

摘要

The hypervelocity impact experiments on the ground are indispensable in order to develop the defense structure over the impact with space structure and space debris. Today Two-Stage Light Gas Gun (TSLGG) is one of the most powerful accelerators. In Kyushu Institute of Technology, projectile velocity of 7.94 km/s was attained by means of the TSLGG with hydrogen gas. However it is well known that relative impact velocity at the low earth orbit is up to 15km/s. This impact velocity cannot be attained by the current TSLGG because sound velocity of light gas is smaller than 10km/s. Then, we have started a project of counter impacts in order to raise impact velocity. We developed a new TSLGG in which the technology of Electrothermal-Chemical (ETC) gun is applied to the 1st stage of TSLGG. In this paper, we measured delay time of ETC-based TSLGG as well as time variation of current, discharge voltage and pressure. And we succeeded to reduce jitter of the delay time small than ±0.1 msec.