Gas Dynamic Characteristics of the Helium Two Stage Shock Tube for MHD Power Generation Experiments

概要

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Gas dynamic performance of a helium two stage shock tube which is designed for a simulator of an MHD power generator is studied theoretically and experimentally. To obtain adequate working fluids behind the shock waves, a two stage shock tube with a diameter of 130mm and a length of 13m is designed. As a buffer gas argon and helium are chosen and their effects on the performance are studied. When helium is used, the performance well agrees with the theory in which the reduction of the shock velocity in the buffer chamber is considered. Obtained shock velocity is 3800m/sec, which can produce shocked gas with 1atm. and 2000°K. This is considered to fulfil the working conditions of an MHD generator. When the tailoring interface operation is made, we can obtain uniform gases of the duration time of 2.2 msec, which is 60% of the ideal value.
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