Numerical Investigation Of Emergency Blowing Water With Gas

At present, dynamic anti-sinking capability of submarines is paid increasing attention by the countries with submarines. Usually, high-pressure gas is adopted to blow ballast tanks when the submarines are damaged underwater and needed emergency surfacing. But some localizations exist for this system, such as lower blowing speed, worse blowing ability and so on, which make the underwater sail of submarines in danger. Accordingly, it is a high-powered emergency surfacing measure that minitype solid rocket motors are applied on the submarines as gas generators for blowing ballast tanks emergently.Based on the theory analysis of gas blowing submarine ballast tanks, k-εtwo-equation turbulence model and VOF method for tracing gas-liquid interface are used to simulate the flow field of nozzle and ballast tank in the blowing systems in this paper. Flowing details during the process, parameters distributing in the flow flied, and shock wave structure's generating and moving are given by simulating. And various factors are analyzed particularly which affect the anti-sinking capability of submarines. The simulation results are in agreement with that of experiment and literature, which can be used to direct the design and use of emergency blowing systems and the actual maneuver of submarine emergency surfacing exactly.At the same time, ballonet blowing the ballast tanks of submarines as another project is put forward in this paper. In the coordinate system of 2-D axis symmetry, numerical simulation is carried through with the technology of dynamic mesh in FLUENT software for ballonet project. The structure and movement details of waves in the ballonet are analyzed, and the working conditions of ballonet are paid particular considering and evaluation. Simultaneously, the simulation results show the parameters' changing with time in the ballast tanks, which are agreed with literature results very well.