Shock Tube Measurement of the Weak Shock Reflection Characteristics of Acoustic Materials.
Final rept. Aug-Dec 71,
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Weak shock wave interactions with absorber materials normal to the wave were studied. The experiments included the use of a 2.06-inch shock tube to generate waves where the shock pressure ratios ranged from 1.2 to 2.0. The effect of incident pressure ratio, thickness of material, diameter of perforation, closed area, and flow resistance were studied. The results indicated that percent closed area, flow resistance, and pressure ratio were the most significant parameters in determining the reflection coefficient. A conventional steady-state flow measurement of the flow resistance could be used to predict the reflection coefficient when the flow resistance was measured at the appropriate velocity.