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.
作者
万春浩
王瑞和
周卫东
李罗鹏
WAN Chunhao;WANG Ruihe;ZHOU Weidong;LI Luopeng(College of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2019年第2期257-260,共4页
Fault-Block Oil & Gas Field
关键词
空化射流
角形喷嘴
流场
数值模拟
cavitation jet
angle nozzle
flow field
numerical simulation
