摘要
为了解水阀内部流动状况,采用RNG k-ε湍流模型和SIMPLE算法,对所选水阀在不同开度下进行数值模拟,得到阀内的压力、速度和湍流耗散率.模拟结果表明,在进口压力为0. 09 MPa的仿真工况下,开度为20%时,阀内出水段相较其他开度压力值较小且稳定;随着开度的增大,阀内喉部处的压力梯度增大,出水段X方向压力波动增大.阀内速度最大处为喉部区域,此时,低速区域范围最大,随着水阀开度的增加,喉部周围区域速度增加,流场中低速区范围减小.流线结果显示阀芯处漩涡一直存在,与水阀开度大小无关,而出水段靠近喉部的顶端处漩涡的存在与水阀开度有关,开度增大时,其漩涡的范围是增大的,且由流线图可得流场内流束的集中区域为水阀内出水段顶部;出水段流场湍流耗散率的相关数据表明,随着水阀开度的增加,流场中湍流耗散率也是增加的.本数值结果为优化阀内流道结构提供了参考数据.
In order to understand the flow status inside the valve, the RNG κ-ε turbulence model and SIMPLE algorithm are used to simulate the flow status inside the selected water valve with different opening, for which the internal flow field pressure, velocity and turbulence dissipation rate are analyzed in detail. The simulation results show that the inlet pressure is under 0.09 MPa, the flow field pressure value with 20% opening is smaller and more stable than the other opening. With the increase of opening, the pressure gradient in the valve throat increases, the pressure fluctuation enhances in X direction of outlet. The maximum velocity inside the valve is throat urea. At this time, the range of the low speed region is the largest. With the increase of the water valve opening, the velocity around the throat increases, and the range of the middle and low velocity region decreases. The streamline presents that the vortex always exists at the valve core, and its existence is not related to the opening of the water valve, but the vortex at the top of the outlet near the throat is related to the opening of the valve. When the opening increases, the range of the vortex increases, and the flow field streamline stream is concentrated to the valve＇s top. Finally, the turbulent dissipation rate of the flow field in the outlet section depicts that the rate increases with the opening of the valve increase. These numerical results could provide a ref- erence to optimize the valve flow channel structure.
作者
江帆
徐勇程
陈江栋
卢浩然
陈玉梁
祁肖龙
JIANG Fan;XU Yong-cheng;CHEN Jiang-dong;LU Hao-ran;CHEN Yu-liang;QI Xiao-long(School of Mechanical and Electrical Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《广州大学学报（自然科学版）》
CAS
2018年第4期73-80,共8页
Journal of Guangzhou University:Natural Science Edition
基金
广东省自然科学基金资助项目(2016A030313653)
广州市科技计划资助项目(201504291436202)
关键词
水阀
数值模拟
流场
开度
湍流耗散率
water valve
numerical simulation
flow field
opening
turbulent dissipation rate
作者简介
江帆（1974-），男，教授．E—mail：jiangfan2008@gzhu．edu．cn
