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On-line Access: 2022-02-28
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Ai-bo WEI, Rong GAO, Wei ZHANG, Shun-hao WANG, Rui ZHOU, Xiao-bin ZHANG. Computational fluid dynamics analysis on flow-induced vibration of a cryogenic poppet valve in consideration of cavitation effect[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2100118 @article{title="Computational fluid dynamics analysis on flow-induced vibration of a cryogenic poppet valve in consideration of cavitation effect", %0 Journal Article TY - JOUR
低温调节阀空化流致振动的计算流体力学分析创新点:1.建立低温调节阀空化与阀芯振动特性耦合作用分析的三维数值模型;2.获得低温调节阀内液氮空化流动的动态演变规律及其与阀芯振动的相互作用机制。 方法:1.通过有限元静力分析,获得阀杆受力与变形的关系曲线(图4);2.通过理论分析,构建阀芯的运动方程(公式(11)),并得到阀芯的流固耦合计算程序(图5);3.通过仿真模拟,建立低温调节阀空化与阀芯振动特性耦合作用分析的三维数值模型;4.使用用户自定义函数和动网格法对阀芯的动态运动过程进行模拟,获得液氮空化流动的动态演变规律,并分析阀门开度和进出口压差对阀芯空化流致振动特性的影响。 结论:1.阀芯的空化流激运动呈现出振幅逐渐增大的周期性振荡规律;在阀门开度为30%,进口压力为1000 kPa时阀芯的振动频率约为116.6 Hz;阀芯在振荡过程中与右侧阀座发生撞击并形成稳定的循环,且伴随着大量空泡在阀芯表面附近快速产生和溃灭。2.空化发生时,大量空泡的破裂导致流场局部压力瞬时突增,并产生10倍于空化未考虑时的压力峰值;考虑空化效应时,阀芯与阀座之间的平均撞击频率和撞击速度相对较小。3.阀门的开度和进出口压差对阀芯的振动特性有显著影响;当开度较小、压差较大时,阀芯的振动频率以及位移脉动峰值显著增大,阀芯撞击阀座的时间也更早且平均撞击速度更大,使阀芯与阀座间的碰撞加剧,进而导致阀芯的冲蚀和疲劳破坏,严重影响阀门的强度性能与使用寿命。 关键词组: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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