ANALYSIS OF TRANSMISSION AND DIFFRACTION EFFECTS OF AIR SHOCK WAVES UPON FLEXIBLE EXPLOSION-PROOF WALLS

To investigate the transmission and diffraction phenomena when air shock waves attack flexible explosion-proof walls, the air blast pressure flow field behind a flexible wall was studied via numerical simulation. The weight of TNT charge in the simulation is 5kg, 10kg, 15kg and 20kg, respectively. The transmission and diffraction phenomena of air shock waves behind the flexible wall are analyzed and the pressure time histories are compared. Finally, the air blast pressure distributions behind the wall are studied. The results show that there are mainly two peak pressures behind the flexible wall, one being the transmitted pressure and the other the diffracted pressure. Transmitted pressure is caused by the motion of the deformed wall and is dependent on the wall’s deformation rate. Diffracted pressure is caused by the diffraction of air shock wave propagated over the wall. The distributions of the transmitted pressure and diffracted pressure are different, and hence the analysis of them should be treated differently.