蜂窝密封流场旋涡能量耗散的数值研究.pdfVIP

第 27 卷 第 32 期 中 国 电 机 工 程 学 报 Vol.27 No.32 Nov. 2007 2007 年 11 月 Proceedings of the CSEE ©2007 Chin.Soc.for Elec.Eng. 0258-8013 (2007) 32-0067-05 TH113 A 470 30 文章编号： 中图分类号： 文献标识码： 学科分类号： ⋅ 蜂窝密封流场旋涡能量耗散的数值研究 李金波，何立东 (北京化工大学诊断与自愈工程研究中心，北京市 朝阳区 100029) Energy Dissipation of Vortexs in Honeycomb Seals Using Numerical Simulation LI Jin-bo, HE Li-dong (Diagnosis and Self-Recovery Engineering Research Center, Beijing University of Chemical Technology, Chaoyang District, Beijing 100029, China) ABSTRACT: A commercial CFD software is used to found the 关键词：蜂窝密封；数值模拟；能量耗散；气体温度 finite element model and to calculate the flow characteristics of 0 引言 the gas flowing through the honeycomb seals by the k-ε two equations turbulence model. Analysis from the point of view of 随着汽轮机，航空发动机等旋转机械性能的 energy translation explains why honeycomb seals have very 不断提高，密封的泄漏已经成为影响透平机械性 little leakage flow rate. Results show that since the leakage flow 能的重要因素之一，改进和发展密封技术有巨大 is divided into small vortex flows by the specific hexagon 潜力。美国在其联合涡轮先进燃气发生器项目的 structure of honeycomb seal, the energy of gas can be 第三阶段目标(JTAGGⅢ) 中指出，通过该项目的 transferred into heat energy more efficiently which leads to 实施，争取燃气轮机燃料消耗减少 40% ，增加发 decrease the leakage flow rate ；there exists loop flow in the 动机的轴功率与重量比 120% ，减少生产成本 labyrinth seal which weakens the energy translation，the leakage 35% ，减少维护费用 35% ，并指出改进和发展新 flow rate is more. The results also show that appropriate cell