指尖密封各向异性流动传热及热变形研究  

Research of anisotropic flow heat transfer and thermal deformation of finger seals

作　　者：胡雪峰 王娟[1] 刘美红[1] 宋晓磊 HU Xuefeng;WANG Juan;LIU Meihong;SONG Xiaolei(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,昆明650500

出　　处：《兵器装备工程学报》2024年第8期248-258,共11页Journal of Ordnance Equipment Engineering

基　　金：云南省教育厅科学研究基金项目(2024J0070);国家自然科学基金项目(51765024)。

摘　　要：航空发动机中指尖密封通常工作在高压差、高温及高转速的环境中,为研究其内部复杂的流动传热及热变形问题,建立指尖密封各向异性流动与传热的三维流场模型和用于热变形分析的固体模型,基于流场模型,得到不同工况下指尖密封的压力场和温度场,并将其作为边界条件加载到固体模型进行热变形分析。结果表明:在流动与传热方面,泄漏率随压差的增大而增大,随转速的增大而略有下降,随过盈量的增大而减小;各向异性与各向同性传热相比,由于考虑了轴向接触热阻,所以其轴向温度梯度变化量更大;最高温度随转速的增大而增大,且随压差的增大而减小。在热变形方面,径向最大变形量随转速及过盈量的增大而增大,转速与压差对轴向变形量影响较小;相同过盈量下,径向最大变形量约为安装过盈量的21.6%,轴向最大变形量约为安装过盈量的4.68%;在相同压差下,过盈量每增加0.1 mm,径向最大变形量约增加89.89%,而泄漏率相应减小4.86%。研究可为接触式指尖密封结构参数优化及密封失效分析提供一定参考。In order to study the complex flow heat transfer and thermal deformation problems inside the finger seals,a three-dimensional flow field model of anisotropic flow and heat transfer of finger seals and a solid model for thermal deformation analysis are established,and the pressure field and temperature field of finger seals under different working conditions are obtained based on the flow field model,and they are loaded into the solid model for thermal deformation analysis as boundary conditions.The results show that in terms of flow and heat transfer,the leakage increases with the increase of pressure difference,decreases slightly with the increase of speed,and decreases with the increase of interference.In terms of thermal deformation,the maximum radial deformation increases with the increase of speed and interference,and the influence of speed and pressure difference on the axial deformation is small,the maximum radial deformation is about 21.6%of the installed interference under the same interference,and the axial maximum deformation is about 4.68%of the installed interference,and the maximum radial deformation increases by 89.89%and the leakage decreases by 4.86%for every 0.1mm increase of interference under the same pressure difference.This study can provide a certain reference for the optimization of structural parameters and seal failure analysis of contact finger seals.

关 键 词：指尖密封 各向异性 泄漏率 温度场 热变形 

分 类 号：TB42[一般工业技术]