锥形多股火药燃气射流与液体工质相互作用的实验研究

Interaction between Cone-shaped Multiple Combustion Gas Jets and Liquid

为了解水下枪械的发射机理,设计了锥形多股火药燃气射流与水相互作用的模拟实验装置,借助高速摄像机研究了不同喷射压力、不同喷孔直径对多股燃气射流扩展特性的影响。实验结果表明:喷射压力增大,燃气射流的扩展速度增大,扩展过程中湍流不稳定性增强,气液卷吸程度加剧;喷射压力从10.8 MPa提高到28.8 MPa,中心射流的扩展速度增大28%,侧孔射流的扩展速度增大40%;中心喷孔直径由2 mm增大到3 mm,中心射流的扩展速度增大29%,侧孔射流的扩展速度增大26%,但射流的速度下降趋势更明显,而侧面喷孔直径的变化对射流扩展速度影响较小。

To understand the firing mechanism of underwater gun, a experimental platform was designed to simulate the interaction between cone-shaped multiple combustion gas jets and liquid. The influences from various injection pressures and nozzle diame- ters on multiple jets expansion characteristics was studied using a high-speed camera system. Experiment results show that increas- ing the injection pressure seems to improve expansion speed of jets and enhance flow turbulence and gas-liquid entrainment process. Injection pressure rises from 10.8 MPa to 28.8 MPa, expansion speed of central jet of nozzle A increases 28% ,expansion speed of lateral jet increases 40%. The center orifice diameter increases from 2 mm to 3 mm, the maximum expansion speed of cen- tral jet and lateral jet increases 29%, 26% ,respectively,and the speed decays faster as a another feature, while the lateral orifice diameter has little influence on expansion speed.