V形节流阀口瞬态空化特性研究
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摘要
采用Fluent中修正后的RNG κ-ε湍流模型、壁面函数、Z-wart空化模型对滑阀V形节流口的空化特性进行数值计算。结果表明:V形阀口产生空化的主要原因是:油液在快速流经阀口时受到了强烈的剪切作用,导致内部微小气泡被释放出来,V形节流槽斜面逐渐生长起来的气泡在节流边脱落,这主要与边界层的分离现象有关。背压对气穴现象有明显的抑制作用,背压较高时空泡的脱落周期变短、空化范围明显减小,气穴位置移向靠近阀芯处。
The modified RNG κ-ε turbulence model, wall function, and Z-wart cavitation model in Fluent are used to calculate the cavitation characteristics of the valve port with v-grooves. The result shows that the hydraulic oil fast-flowing through the valve port is subjected to intensive shearing, which resulting the release of tiny bubbles. The growing bubbles shed in the bevel of throttling grooves with v-grooves,which is related to the boundary layer separation. The back pressure has an obvious inhibitory effect on the cavitation phenomenon. As the back pressure is relatively high, the shedding cycle of the cavitation is shorter, the cavitation range decreases obviously, corresponding the position of the cavitation is moved to the valve spool.
The modified RNG κ-ε turbulence model, wall function, and Z-wart cavitation model in Fluent are used to calculate the cavitation characteristics of the valve port with v-grooves. The result shows that the hydraulic oil fast-flowing through the valve port is subjected to intensive shearing, which resulting the release of tiny bubbles. The growing bubbles shed in the bevel of throttling grooves with v-grooves,which is related to the boundary layer separation. The back pressure has an obvious inhibitory effect on the cavitation phenomenon. As the back pressure is relatively high, the shedding cycle of the cavitation is shorter, the cavitation range decreases obviously, corresponding the position of the cavitation is moved to the valve spool.
引文
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[4]Lu L,Zou J,Fu X,et al. Cavitating Flow In Non-Circular Opening Spool Valves with U-Grooves[J]. Proceedings of the Institution of Mechanical Engineers, Part C:Journal of Mechanical Engineering Science,2009,223(10):2297-2307.
[5]Yakhot V, Orszag S A. Renormalization Group Analysis of Turbulence. I. Basic theory[J]. Journal of Scientific Computing, 1986,1(1):3-51.
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[7]王鹏飞.油压锥阀阀口空化流动数值模拟[D].兰州:兰州理工大学,2016.
[8]杜学文.液压阀口空化机理及对系统的影响[D].杭州:浙江大学,2008.
[2]邹俊,等.液压阀口气穴、振动与噪声研究[C]//中国机械工程学会流体传动与控制分会.第六届全国流体传动与控制学术会议论文集.兰州:第六届全国流体传动与控制学术会议,2010.
[3]陆亮.液压节流阀中的空化流动与噪声[D].杭州:浙江大学,2012.
[4]Lu L,Zou J,Fu X,et al. Cavitating Flow In Non-Circular Opening Spool Valves with U-Grooves[J]. Proceedings of the Institution of Mechanical Engineers, Part C:Journal of Mechanical Engineering Science,2009,223(10):2297-2307.
[5]Yakhot V, Orszag S A. Renormalization Group Analysis of Turbulence. I. Basic theory[J]. Journal of Scientific Computing, 1986,1(1):3-51.
[6]Fluent Inc. Fluent 6. 3 User's Guide[M]. Lcbanon:Fluent Inc,2006.
[7]王鹏飞.油压锥阀阀口空化流动数值模拟[D].兰州:兰州理工大学,2016.
[8]杜学文.液压阀口空化机理及对系统的影响[D].杭州:浙江大学,2008.