蜂窝密封流场旋涡能量耗散的数值研究  

Energy Dissipation of Vortexs in Honeycomb Seals Using Numerical Simulation

作　　者：李金波[1] 何立东[1] 

机构地区：[1]北京化工大学诊断与自愈工程研究中心,北京市朝阳区100029

出　　处：《中国电机工程学报》2007年第32期67-71,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50375013;50675013);教育部科学技术研究重点项目(105019)~~

摘　　要：文中采用商业CFD软件建立有限元模型,并采用k-ε两方程湍流模式求解了蜂窝密封的流动特性。从能量转化的角度分析解释了蜂窝密封具有良好封严特性的原因。计算结果表明,由于蜂窝密封特殊六边形结构将泄漏流体分割成小涡流,更有效地将气体能量转化为热能,从而减小泄漏;梳齿密封由于环向流动存在,削弱了能量耗散,泄漏量比较大。同时说明合适的蜂窝芯格尺寸和蜂窝深度会提高能量耗散,达到最佳的封严效果。文中的研究成果为透平机械中应用蜂窝密封提供了理论依据和技术支持。A commercial CFD software is used to found the finite element model and to calculate the flow characteristics of the gas flowing through the honeycomb seals by the k-ε two equations turbulence model. Analysis from the point of view of energy translation explains why honeycomb seals have very little leakage flow rate. Results show that since the leakage flow is divided into small vortex flows by the specific hexagon structure of honeycomb seal, the energy of gas can be transferred into heat energy more efficiently which leads to decrease the leakage flow rate： there exists loop flow in the labyrinth seal which weakens the energy translation, the leakage flow rate is more. The results also show that appropriate cell size and depth of honeycomb seals can improve the effect of energy translation, getting the perfect hermetic effect. The study can supply theoretical foundation and technical support for the engineering application of the honeycomb seal for turbine machinery.

关 键 词：蜂窝密封 数值模拟 能量耗散 气体温度 

分 类 号：TH113[机械工程—机械设计及理论]