A Long Stroke Isentropic Free Piston
نویسنده
چکیده
SUMMARY The application of a long stroke isentropic free piston compressor as the energy source for an intermittent M = 6.85 hypersonic wind tunnel is described. The advantages of comparatively long running times of up to 0.5 s and uniform reservoir conditions at up to 90 bar and 600 K are discussed. Particular problems arising from the long stroke compression associated with both viscous flow effects and non-steady wave propagation are discussed and solutions suggested. The theoretical operating principles of long stroke compression tubes are presented and experimental results are given for a pilot facility with compression tube diameter of 0.032 m and length to diameter ratio of 120 and for a full scale facility with corresponding values of 0.11 m and 114.
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تاریخ انتشار 1978