0907 軸対称二次曲面先頭部による微気圧波の模型実験(OS9-2 超音速流れの基礎と応用,OS9 超音速流れの基礎と応用)

Abstract

Experiments were conducted with a scale model launching apparatus to investigate the micro-pressure wave generated by axisymmetric trains of quadratic nose profiles. The nose shapes were an ellipsoid of revolution, a paraboloid of revolution, and a cone. The peaks of pressure gradient waveforms of the compression waves generated by those train models entering a tunnel were measured with consideration on effects of the ground and offset of a running train, in a double track tunnel. The peak of pressure gradient generated by the cone nose shape is the largest, and that generated by the paraboloid nose shape is the smallest among the three nose shapes. Difference of the peak values tends to be larger when the trains run in offset position.