角形空化喷嘴内外流场的数值模拟
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摘要
为研究角形空化喷嘴对空化射流空化效果的影响,建立了空化喷嘴内外流场的数学模型和物理模型。利用流体力学模拟软件FLUENT,采用混合模型、空化模型和RNGκ-ε湍流模型对角形空化喷嘴的空化射流内外流场进行了数值模拟。以射流流场中含气率分布为判断喷嘴产生空化效果的依据,分析了直柱段直径、入口压力、围压对射流空化效果的影响。模拟结果表明:相同喷嘴入口压力条件下,直柱段直径越大,射流空化效果越好;增大喷嘴入口压力可以提高射流空化效果,但围压的存在会抑制空化泡的产生,不利于提高空化效果。数值模拟结果可以为空化射流的产生提供指导。
The physical model and mathematical model of cavitation nozzle inner and external flow fields are established to study the effect of the angle cavitation nozzle on cavitation jet. The numerical simulation of cavitation jet flow fields is carried out by using the mixed model, cavitation model and RNG κ-ε turbulence model of the fluid mechanics simulation software FLUENT. Based on the gas volume distribution in the flow fields, the influence on the cavitation jet of the cylinder diameter, the inlet pressure and the ambient pressure is analyzed. The simulation results show that under the same condition of inlet pressure, the larger the cylinder diameter is, the better the cavitation effect is. Increasing the inlet pressure of the nozzle can improve the cavitation degree of the jet.However, the existence of ambient pressure can suppress the formation of cavitation bubbles and it is not conducive to the improvement of cavitation effect. The numerical simulation results can provide guidance for the generation of cavitation jet.
The physical model and mathematical model of cavitation nozzle inner and external flow fields are established to study the effect of the angle cavitation nozzle on cavitation jet. The numerical simulation of cavitation jet flow fields is carried out by using the mixed model, cavitation model and RNG κ-ε turbulence model of the fluid mechanics simulation software FLUENT. Based on the gas volume distribution in the flow fields, the influence on the cavitation jet of the cylinder diameter, the inlet pressure and the ambient pressure is analyzed. The simulation results show that under the same condition of inlet pressure, the larger the cylinder diameter is, the better the cavitation effect is. Increasing the inlet pressure of the nozzle can improve the cavitation degree of the jet.However, the existence of ambient pressure can suppress the formation of cavitation bubbles and it is not conducive to the improvement of cavitation effect. The numerical simulation results can provide guidance for the generation of cavitation jet.
引文
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[4]李疆,陈皓生.Fluent环境中近壁面微空泡溃灭的仿真计算[J].摩擦学学报,2008,28(4):311-315.
[5]王萍辉.空化水射流清洗的实验研究[J].中国矿业,2004,13(5):45-48,52.
[6]王学杰,李根生,康延军,等.利用水力脉冲空化射流复合钻井技术提高钻速[J].石油学报,2009,30(1):117-120.
[7]王金刚,郭培全,王西奎,等.空化效应在有机废水处理中的应用研究[J].化学进展,2005,17(3):549-553.
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[9]邓松圣,沈银华,李赵杰,等.空化射流喷嘴流场的数值模拟[J].后勤工程学院学报,2008,24(2):42-46.
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