斯特林发电机中气体轴承设计与实验研究

Design and Experimental Study of Gas Bearing in Stirling Engine

提出一种适用于大功率斯特林发电系统中动力活塞的稳定气体轴承支撑方案,所提方案采用独立气泵、间隙密封与气体轴承耦合的供排气气路、间隙密封隔绝两侧腔体压力。采用计算流体动力学数值模拟分析不同节流孔直径、不同气膜厚度对气体轴承耗气量和承载力的影响,并验证间隙密封耦合气体轴承的新型气路的可行性。通过节流器、气膜厚度、活塞摩擦力等实验测试分析,以及对气体轴承中结构参数的高精度测量,结合激光测距仪与推拉力测试,实现对动力活塞气体轴承性能的高精度、完整评测。最后,建立一套完整的气体轴承设计、测试与分析平台,实现气体轴承活塞支撑的完全可控设计。

A stable gas bearing support scheme suitable for power piston in high-power Stirling power engine was proposed.The scheme adopted independent air pump,air supply and exhaust gas circuit coupled with gap seal and gas bearing,and gap seal to isolate the cavity pressure.In this paper,computational fluid dynamics numerical simulation is used to analyze the effects of different orifice diameter and different gas film thickness on the gas consumption and bearing capacity of gas bearing,and verify the feasibility of the new gas path of gap seal coupled gas bearing.And this paper also carries out the experimental test and analysis of orifice,gas film thickness and piston friction.Through the high-precision measurement of structural parameters in gas bearing,combined with laser rangefinder and push-pull test,the high-precision and complete evaluation of the performance of power piston gas bearing could be realized.This paper establishes a complete set of gas bearing design,test and analysis platform,realizes the fully controllable design of gas bearing piston support,and provides a guarantee for the stable and reliable operation of gas bearing support piston in high-power free piston Stirling engine.