基于试验设计方法的液相孔型-迷宫密封几何参数敏感性分析  

Sensitivity Analysis of Liquid Hole-Pattern Stator/Parallel-Grooved Rotor Seal Design Parameters Based on Design of Experiments Method

作　　者：薛文松 王天昊 李志刚[1] 李军[1] XUE Wensong;WANG Tianhao;LI Zhigang;LI Jun(Institute of Turbomachinery,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《西安交通大学学报》2024年第3期58-68,共11页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(52176042)。

摘　　要：为了评估新型液相孔型-迷宫密封在转子偏心下的泄漏特性,提高其运行稳定性,提出了中心组合设计的试验设计方法。对新型液相密封中影响泄漏特性和静态转子动力特性的关键几何参数(迷宫腔室深度、宽度、孔深和孔径)进行敏感性分析;采用基于动网格技术和稳态RANS方程的数值计算方法求解25种几何参数组合的新型液相密封在2种偏心率(0.1、0.2)下的泄漏量、静态气流激振力和静态刚度系数;分别以泄漏量、静态气流激振力和静态刚度系数为响应,以4个几何参数为变量获得主效应图。结果表明:偏心率对泄漏量的大小以及其几何参数敏感性影响很小,当腔室深度、宽度、孔深和孔径分别在40%、24%、56%、44%水平时,泄漏量最小;在转子偏心下,切向力随着迷宫腔室深度与宽度的增加而单调递减,随着孔深与孔径的增加先增加后减小;径向力随着腔室深度的增加而增加,随着腔室宽度的增加先减小后增加;当偏心率增加到0.2时能找到使静态直接刚度最大的几何参数组合,此时腔室深度、宽度、孔深和孔径分别在24%、48%、40%和64%水平。在转子偏心与不偏心工况下,腔室深度与宽度的增加均会造成静态交叉刚度的单调递减;转子偏心时静态交叉刚度随着孔深与孔径的增加先增加后减小。该研究结果可为液相孔型-迷宫密封的性能分析和结构设计提供参考。To evaluate the leakage performance of the novel liquid hole-pattern stator/parallel-grooved rotor seal under rotor eccentricity and improve its operational stability,a central composite design(CCD)is proposed as a design of experiments(DOE)method.A sensibility analysis of key geometric parameters,including cavity depth,cavity length,hole depth,and hole diameter,is conducted to investigate their impact on the leakage performance and rotor stability.A numerical computation approach is adopted,utilizing the mesh deformation technique and steady-state RANS equations,to solve for the leakage,static aero-excitation force,and static stiffness coefficient of the novel liquid seal for 25 combinations of geometric parameters.The computations are performed under two eccentricity values(0.1 and 0.2).The main effects plot is obtained,taking the leakage,static aero-excitation force,and static stiffness coefficient as responses and the four geometric parameters as variables.The results indicate that eccentricity has little effect on the leakage and its parameter sensitivity,and the leakage is the smallest when cavity depth,cavity length,hole depth,and hole diameter are at 40%,24%,56%,and 44%of their respective levels.When the rotor is eccentric,the tangential force decreases monotonically with the increase of cavity depth and width,while it increases first and then decreases with the increase of hole depth and diameter.The radial force increases monotonically with the increase of cavity depth,while it decreases first and then increases with the increase of cavity width.When eccentricity increases to 0.2,a geometric parameter combination can be identified that maximizes the static direct stiffness.In this case,the cavity depth,cavity width,hole depth,and hole diameter are at 24%,48%,40%,and 64%of their respective levels.Under both eccentric and non-eccentric rotor conditions,the static cross-coupling stiffness decreases monotonically with the increase of cavity depth and width.When the rotor is eccentric,the static cross-coupli

关 键 词：液相密封 泄漏量 静态流体激振力 静态刚度系数 试验设计方法 

分 类 号：TH136[机械工程—机械制造及自动化]