Numerical simulation of cavitation cavity characteristics of double Helmholtz nozzle
Based on the Helmholtz nozzle with higher natural frequency,a double Helmholtz pulse cavitation jet nozzle is designed.The effects of the cavity ratio,cavity distance,flow path diameter and fillet radius between the two resonators on their cavitation effect,turbulent kinetic energy and outlet velocity characteristics are analyzed by numerical simulation.The results show that the change of cavity ratio,cavity distance,flow path diameter and fillet radius will affect the cavitation effect in the nozzle.When the cavity ratio of the resonant cavity is 0.84,the cavity distance is 40 mm,and the flow path diameter between the cavities is 12 mm,the cavitation bubble generation effect in the two resonant cavities is good,the cavity void fraction is high,and the turbulent kinetic energy at the nozzle outlet is strong,which is more conducive to the improvement of the pulse cavitation cleaning efficiency.When the two chamber inlets of the nozzle are rounded,the internal cavitation of the nozzle decreases dramatically and the turbulent kinetic energy decreases,which inhibits the cavitation pulse performance of the nozzle and has a reaction to improve the nozzle cleaning effect.
cavitationoil tank cleaningdouble Helmholtznumerical simulation
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