光轴蜂窝汽封泄漏特性研究  

Numerical investigation on leakage characteristics of smooth honeycomb seal

作　　者：杨荣祖[1] 宁哲[1] 宋文希[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《热力发电》2013年第11期97-100,106,共5页Thermal Power Generation

摘　　要：利用Fluent软件建立光轴蜂窝汽封的三维计算模型,研究汽封进、出口压比、汽封间隙、蜂窝内径以及蜂窝高度对蜂窝汽封泄漏特性的影响。研究结果表明:蜂窝汽封泄漏量随汽封进、出口压比的增加而增加,且增加率逐渐减小;随着汽封间隙的增加,蜂窝汽封泄漏量急剧增加,密封效果迅速恶化;蜂窝高度的增加有利于降低蜂窝汽封的泄漏量,泄漏量随蜂窝高度的增加近似呈反S型减小;蜂窝内径为3.2mm时汽封泄漏量最小,蜂窝内径小于3.2mm时,蜂窝内径的变化对蜂窝汽封泄漏量的影响非常小,可以忽略,蜂窝内径大于3.2mm时,蜂窝内径变化会引起泄漏量的迅速增加。建议蜂窝高度不小于4.8mm,蜂窝径高比Φ不小于1.5。A 3-dimensional calculation model for the smooth honeycomb seal was established by employing the Fluent software to investigate the effects of pressure ratio(inlet/outlet),clearance,honeycomb cell inner diameter and height on the leakage characteristics of honeycomb seal.The results showed that,the leakage of honeycomb seal increased with the pressure ratio,and the increasing rate gradually decreased.The leakage flow increased sharply with the seal clearance,and the sealing effect deteriorated dramatically.An increase of honeycomb cell height was beneficial to reducing the leakage,for the leakage showed an 'anti-S shape' decreasing trend as the honeycomb cell height increased.When the inner diameter of honeycomb cell was 3.2mm,the leakage reached the minimum;when the inner diameter was smaller than 3.2 mm,the effect of inner diameter change on leakage was very small and can be ignored;when the inner diameter was larger than3.2mm,the inner diameter variation can result in a sharp increased in leakage.It suggested that the height of the honeycomb cell should not be smaller than 4.8mm,and the diameter/height ratio should not be lower than 1.5.

关 键 词：蜂窝汽封 进、出口压比 汽封间隙 蜂窝内经 蜂窝高度 径高比 泄漏量 

分 类 号：TK263.2[动力工程及工程热物理—动力机械及工程]