다공벽을 전파하는 약한 충격파에 관한 연구

A computational analysis has been conducted to attenuate the shock wave propagating a perforated duct. The pressure histories and detailed flow structures are analyzed for the range of the incident shock wave Mach number between 1.02 and 1.12. Computational results using the two-dimensional, unsteady, compressible, Navier-Stokes equations are validated with the shock tube experiments. The incident shock wave attenuates when it propagates along the perforated duct, eventually changing to a sound wave. It is found that behind the incident shock wave, the pressure strongly fluctuates due to the shock wave diffraction and reflection processes. The results obtained show that in order to achieve an effective alleviation of the tunnel impulse waves, the length of the perforation section should be sufficiently long.