4. CONCLUDING REMARKS

The characteristics of the shock wave propagation through the cylinder array are experimentally investigated by using the shock tube. The unsteady pressure measurement and the flow visualization by the schlieren method are made. The major conclusions are as follows:
(1) In the downstream region of the cylinder array, the attenuation of the transmitted shock wave occurs.
(2) In the upstream region of the cylinder array, the pressure augmentation due to the reflected shock wave occurs. The extent of the pressure augmentation in the upstream region is much stronger than that of the pressure attenuation in the downstream region.
(3) The extent of the pressure attenuation and augmentation mainly depends on the blockage ratio of cylinders in the channel and the length of the cylinder array.
(4) The effects of the staggered arrangement of cylinders are small.
(5) In the wake of the cylinder array, significant pressure oscillation due to the shedding of the Kármán vortices occurs.
(6) The essential features of the propagation process are successfully simulated by the unsteady one-dimensional Euler analysis considering the drag force produced by the cylinder array. The drag force is evaluated by fitting the numerical results to the experimental data.