斯特林制冷机间隙密封泄漏量的影响因素权重分析

Weight Analysis of Influencing Factors of Clearance Seal Leakage in Stirling Cryocoolers

为分析斯特林制冷机间隙密封泄漏量影响因素权重,结合同心环形缝隙流动理论,确定影响因素包括间隙厚度、密封长度、间隙两端压差、转速、间隙内径以及活塞冲程。通过正交试验搭建32组数学模型,基于计算流体CFD数值模拟的方法,研究分析不同密封间隙的泄漏情况。利用方差分析对仿真结果进行处理,结果表明间隙厚度对斯特林制冷机的泄漏量影响最大;压差、密封长度、活塞冲程以及转速对泄漏量影响依次减小;间隙内径对泄漏量影响最小。这对斯特林制冷机间隙密封减小泄漏量的设计提供了参考。

In this study,the weight analysis of the influencing factors of clearance seal leakage of Stirling cryocoolers was conducted based on the concentric annular gap flow theory.Influencing factors,including sealing gap height,length,pressure difference,motor speed,clearance diameter,and piston stroke,were determined.Through an orthogonal test,32 sets of mathematical models were established,and the leakages of different seal clearances were analyzed based on the numerical simulation method of computational fluid dynamics.The simulation results were processed using variance analysis,and indicated that the clearance thickness exhibited the most significant influence on the leakage of a Stirling refrigerator.Pressure difference,sealing gap length,piston stroke,and motor speed exhibited a lower influence,where as clearance diameter demonstrated a minimal impact on leakage.This study provides a reference for the design of a Stirling cryocooler clearance seal to reduce leakage.