Influence of gas pressure on flow field characteristics of the underwater gas jet

The flow field of the underwater gas jet with high temperature and high pressure is a compressible multiphase flow with strong shock waves and large deformation. In this study, establishing a two-dimensional axisymmetric five-equation multiphase flow model, and using the Tangent of Hyperbola for Interface Capturing (THINC) method. The numerical simulation of the flow field of methane-oxygen underwater detonation with different filling pressure is carried out. By building a high-speed photography system and an underwater high-pressure gas jet experimental platform, the underwater gas jet by methane oxygen detonating with different filling pressure is studied. The experimental results show that the water possessing the features of hard compressibility and huge mass inertia makes the high-pressure gas jet bubble expand rapidly to both sides of the tube at the initial stage of formation, but expand rapidly obviously in the axial direction at the end of the first expansion circulating. With the increase of filling pressure, the radial expansion of the gas jet bubble is bigger and bigger, and the rewinding distance is increasing concomitantly. The experimental results also show that the first pulsating pressure increases gradually with the increase of packing pressure.