ANALYSIS OF SHOCK-WAVE PROPAGATION OVER PERFORATED WALL AND ITS DISCHARGE COEFFICIENT

Shock wave propagation over a perforated wall and the wall discharge coefficient through the perforation were studied experimentally and numerically. The experiment was conducted in a shock tube equipped with double-exposure holographic interferometry. The shock Mach number was 1.54 in air and the wall perforation ratio was 0.4. The numerical simulation was conducted by means of an upwind finite difference scheme using the TVD scheme. To determine the wall discharge coefficient through the perforation, the numerical result was compared with the experimental one. The wall discharge coefficient through the perforation was obtained as 0.54, and this value can be extended to the perforation ratio ranging from 0.1 to 0.5, a shock wave Mach number of 1.5 to 5.5 and a corresponding Reynolds number of 1.24 x 10(5) to 9.78 x 10(5).