摘要
建立了角型喷嘴物理模型。基于FLUENT软件,采用混合模型、空化模型和RNG k-ε紊流模型对空化射流喷嘴内流场进行数值模拟。以径向线上蒸汽体积分数分布、轴线上蒸汽体积分数分布和速度分布为判断角型喷嘴产生的空化射流空化程度的依据,分析圆柱段直径、入口压力、出口压力对射流空化程度的影响规律。模拟结果表明:圆柱段直径的最佳初始值为1 mm;增大入口压力可以提高射流空化程度,但随着出口压力的增大,又会抑制喷嘴内空化的初生并降低出口速度,不利于射流空化程度的提高。
Physical model of angle nozzle was established. Based on the software of FLUENT, numerical simulation of internal flow field in angle nozzle for cavitation water jet was carried out by use of mixture model, cavitation model and turbulent model. Con- sidering the distribution of water-vapor volume fraction at the radial line, the distribution of water-vapor volume fraction and velocity at axis as the judged criterion of cavitation degree of cavitation water jet, effects of cylindrical section diameter, inlet pressure, outlet pressure on cavitation degree were analyzed. The simulation results show that the optimal cylindrical section diameter is 1 mm; cavitati- on degree of cavitation water jet is enhanced with the increase of inlet pressure; however, cavitation inception inside nozzle is inhibited and outlet velocity decreases when outlet pressure increases, it is adverse to improvement of cavitation degree of cavitation water jet.
出处
《机床与液压》
北大核心
2012年第23期46-50,共5页
Machine Tool & Hydraulics
基金
重庆市自然科学基金项目(CSTC
2009BB7177)
重庆市科技攻关项目(CSTC
2010AC7034)
关键词
空化射流
角型喷嘴
空化程度
数值模拟
Cavitation water jet
Angle nozzle
Cavitation degree
Numerical simulation
