Dimensional Analysis on Resistance Characteristics of Labyrinth Seals  

作　　者：HU Dongxu JIA Li YANG Lixin 

机构地区：[1]Institute of Thermal Engineering,School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University [2]Beijing Key Laboratory of flow and heat transfer of phase changing in micro and small scale

出　　处：《Journal of Thermal Science》2014年第6期516-522,共7页热科学学报（英文版）

基　　金：supported by National Key Technology R&D Program(2012BAB12B02)

摘　　要：Experimental investigation of stepped and straight-through labyrinth seals was designed to study the sealing performance of two different typical labyrinth seals.In order to facilitate dimensional analysis on the flow resistance characteristics of labyrinth seals,the variable cross-section of the flow channels are considered as constant cross-section flow.The mechanical energy loss of flow caused by throttle turbulence intensity is considered as caused by friction along the way.The friction coefficient of stepped labyrinth seals is bigger than that of straight-through labyrinth seals by more than 40% for the same Reynolds number and the ratio of equivalent diameter and the seal length.The expression of friction coefficient /and /Re are obtained from experimental data.The verifications indicate that the expressions are highly accurate.The contribution to the total pressure drop of each tooth cavity gradually becomes less along the flow direction.

关 键 词：straight-through labyrinth seal stepped and straight-through labyrinth seal dimensional analysis resistance characteristic 

分 类 号：TH136[机械工程—机械制造及自动化] TK124[动力工程及工程热物理—工程热物理]