高低齿汽封与蜂窝汽封及孔式阻尼汽封密封性能的比较

Comparison of Seal Performance Among Stepped Labyrinth, Honeycomb and Hole-pattern Damper Seal

使用商用CFD软件Fluent对高低齿汽封、蜂窝汽封及孔式阻尼汽封进行了三维数值模拟,得到三种汽封在不同压比、轴转速和汽封相对间隙时的密封性能,并将高低齿汽封和蜂窝汽封计算值与试验数据进行了对比.结果表明:高低齿汽封流量系数随压比增大而增大,随转速加快而略有减小,随相对间隙的增大而减小;蜂窝汽封与孔式阻尼汽封的流量系数均随压比增大而减小,随转速加快而略有减小,基本呈直线变化规律,随相对间隙的增大而增大;在相同的条件下,蜂窝汽封的漏汽量比高低齿汽封的漏气量减少10%,而孔式阻尼汽封的漏汽量比蜂窝汽封漏汽量减少6%.

A 3D numerical simulation was performed on the stepped labyrinth, honeycomb and hole pattern damper seal using the commercial CFD software Fluent, during which the seal performance of above 3 seals was respectively obtained at different pressure ratios, rotating speeds and relative clearances, while a com- parison made between calculated results and experimental data for the stepped labyrinth seal and honeycomb seal. Results show that for the stepped labyrinth seal, the flow coefficient increases with rising pressure ratio and reducing relative clearance, and drops slightly with rising rotating speed; whereas for both the honeycomb and hole-pattern damper seal, the flow coefficient increases with reducing pressure ratio and rising relative clearance, and drops slightly with rising rotating speed, indicating basi- cally a linear variation law. Under same conditions, the steam leakage of a honeycomb seal is 10% less than that of a labyrinth seal, and 6% higher than that of a hole-pattern damper seal.