爆風型衝撃波発生装置におけるジェットフロー低減に向けた数値解析

ーノズル形状及び高圧部圧力の影響ー

抄録

High order Euler simulations are conducted to investigate suppressing method of jet winds associated with shock waves generated by a blast wave generator, and occurrence factors of the jet winds and influences of a volume of the driver section and the nozzle angle are discussed. The results show that the jet wind is caused by a vortex which occurs at the nozzle edge and can be reduced by decreasing the volume of the driver section. Furthermore, in the present computational cases, using the moderate nozzle angle (1.71 deg.) reduces the jet wind near the nozzle exit and using the large nozzle angle (6.51 deg.) reduces jet wind at the place distant from the nozzle exit. These result show reducing the driver section and using the proper nozzle angle depending on the distance from nozzle exit are effective for reducing the jet wind.