径向环形汽封流动特性研究  

Research on Flow Characteristics of Radial Annular Seal

作　　者：张万福[1] 杨建刚[1] 曹浩[1] 郭瑞[1] 孙丹[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏省南京市210096

出　　处：《中国电机工程学报》2012年第20期115-119,148,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50875045)~~

摘　　要：提出一种新型径向环形汽封,对其结构及密封原理进行分析。与传统梳齿汽封相比,在结构上增加4个90°转弯,将流体泄漏方向由轴向改为径向。增大密封内流体流动阻力,减小了气流激振力。建立普通梳齿汽封和径向环形汽封三维数值计算模型。计算结果表明,同一密封间隙下径向环形汽封泄漏系数比普通轴向梳齿汽封低20%左右。转速对2种汽封径向气流力影响较小,而对切向气流力影响较大。随转速升高,切向气流力不断增大,系统稳定性降低。同一偏心情况下,径向环形汽封径向气流力约比轴向梳齿汽封大1～3倍,切向气流力约比轴向梳齿汽封小70%～75%,且这一比例随转速升高越来越大。A new kind of radial annular seal was presented.The structure and theory of the new kind of seal were analyzed.Comparing with the traditional labyrinth seal,four 90 degree turns were added,and the fluid leakage direction was altered from the axial to radial direction.The flow resistance increased,and the flow-induced force was reduced.Three-dimensional numerical models of the traditional labyrinth seal and radial annular seal were set up.Calculated results show that the discharge coefficient of the radial annular seal is about 20% lower than that of the labyrinth seal.Though rotating speed has small influence on the radial force,it has large effect on the tangential force.The tangential force increases with the increasing speed,the system stability decreases.The radial force of the radial annular seal is about 1～3 times larger than that of the labyrinth seal.The tangential force in the radial annular seal is about 70%～75% lower than that in the labyrinth seal.This ratio becomes larger and larger with the increasing speed.

关 键 词：汽封 泄漏系数 气流力 径向 计算流体力学 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]