调节套筒节流孔倒角对高旁阀流场及结构的影响

Effect of regulating sleeve orifice chamfering on flow fieldand structure of high-pressure bypass valve

为了研究高旁阀内部流场和结构可靠性受调节套筒节流孔倒角深度和角度的影响,开展了高旁阀内部流场的数值计算和单向热-流-固耦合分析.通过分析倒角前阀门内的流场得出以下结论:节流后蒸汽会形成激波和一系列激波串并消失于二级节流筒底盖板处,环形调节套筒密封面处出现应力集中现象,密封面内外较大的压差是造成密封面发生形变的主要原因.以降低调节套筒密封面形变量为目标,研究了调节套筒节流孔倒角的角度和深度对流场和密封面形变量的影响,结果表明:在研究选取的全范围内,倒角角度和深度的增加均能降低调节套筒密封面处的压差和形变量,当倒角角度为72.5°时,调节套筒两侧的形变量降幅分别为17.06%和15.72%,研究结果可为进一步优化阀门流动特性,降低阀门结构形变量提供依据.

In order to investigate the influence of chamfering depth and angle of the regulating sleeve throttling hole on the internal flow field and structural reliability of a high-pressure bypass valve,numerical calculations and one-way thermos-fluid-solid coupling analysis of the internal flow field of the valve were conducted.The results show that after throttling,steam will form shock waves and a series of shock wave trains that disappear at the bottom cover of the secondary throttling sleeve.In addition,the large pressure difference on both sides of the sealing surface of the annular regulating sleeve is the main cause of the sealing surface deformation.Secondly,aiming to reduce the deformation of the regulating sleeve sealing surface,the influence of the chamfering angle and depth of the throttling hole on the flow field and sealing surface deformation was investigated.The results show that chamfering can significantly reduce the pressure difference and deformation of the sealing surface on both sides of the regulating sleeve.When the chamfering angle is 72.5°,the reduction of shape variable on both sides of the regulating sleeve is 17.06%and 15.72%,respectively.This research results provide a basis for optimizing valve flow characteristics and reducing valve deformation.