Numerical Simulation of the Flow Field in the Cavitation Nozzle for Marine Gas Hydrate
Considering the water jet crushing exploitation of marine gas hydrate,the cavitation effects of angle nozzle,Helmholtz nozzle and conical nozzle under the conditions of natural gas hydrate reservoir were compared,and the influence of both inlet and outlet pressure on cavitation characteristics of Helmholtz noz-zle was investigated,including having mathematical model and physical model of the flow field in the nozzle established,and the fluid simulation software adopted for the numerical simulation and the gas content based to judge cavitation effect.The simulation results show that,the cavitation performance of Helmholtz nozzle outperforms that of both angle nozzle and conical nozzle under the condition of natural gas hydrate reservoir.The maximum gas content inside the nozzle reaches 0.95.When other conditions keep unchanged,the greater inlet pressure brings about better cavitation effect produced by Helmholtz nozzle;the high-pres-sure gas hydrate reservoir produces blocking effect and reduces cavitation performance of Helmholtz nozzle.
natural gas hydratecavitation jetnumerical simulationjet crushing
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