INTERACTION OF UNSTEADY EXPANSION WAVE WITH THE CHANGE OF CROSS-SECTIONAL AREA IN TUBE

The interaction of an expansion wave with the cross-sectional area cha nge in a shock tube was investigated both numerically and experimental ly. Numerical results obtained using a piecewise-linear method (PLM) w ere discussed for the variation of the expansion wave characteristics and compared with the experimental results of a simple open-ended shoc k tube. Good agreement was obtained between calculated and measured pr essure variations of the transmitted expansion wave. The relation betw een the maximum rate of pressure change and wave duration of transmitt ed wave was quantitatively clarified for the objective to design a neg ative impulsive wave generator.