风琴管喷嘴空化射流的数值模拟研究

Numerical Simulation Research on Cavitation Jet of Organ Pipe Nozzle

针对风琴管喷嘴的空化射流效率、空化机理等问题,通过流体软件对风琴管喷嘴的的空化射流进行仿真模拟,研究不同入口压力和喷距下喷嘴的空化情况,分析流场的压力、速度、气相体积以及湍动能。结果表明,当入口压力增加时,气相体积分数增大,吼道处所产生的负压范围也越大;随着喷距的增大,驻点处的气相体积分数逐渐减小,说明空化泡在喷距为2D的时候溃灭的最多,即存在空化泡溃灭的最佳位置。

Aiming at the problems of the cavitation jet efficiency and cavitation mechanism of the organ pipe nozzle,the professional software is used to simulate the cavitation jet flow of the organ pipe nozzle.The cavitation situation of the nozzle under different inlet pressures and spray distances is studied,and the pressure,velocity,gas volume and turbulent kinetic energy of the flow field are analyzed.,.The results show that when the inlet pressure increases,the gas phase volume fraction increases,and the negative pressure range generated at the roar is also larger;when the spray distance increases,the turbulent kinetic energy amplitude increases,and the gas phase volume fraction at the stagnation point increases,indicating that the cavitation bubble collapse is affected by the spray distance,that is,there is the best position for the cavitation bubble collapse.