偏心和转速对汽轮机隔板汽封泄漏量的影响  

Effect of Eccentricity and Rotational Speed on Diaphragm Seal Leakage of Steam Turbine

作　　者：曹丽华[1] 李超[1] 李盼[1] 

机构地区：[1]东北电力大学能源与动力工程学院

出　　处：《化工机械》2016年第5期645-648,共4页Chemical Engineering & Machinery

基　　金：国家自然科学基金项目(51476192;51576036)

摘　　要：应用RNG k-ε湍流模型,基于有限体积法求解三维可压缩雷诺时均N-S方程,模拟分析了当转子存在偏心时,偏心距和转速对汽轮机隔板汽封泄漏量的影响。结果表明:在相同汽封间隙下,一定程度的偏心内,泄漏量随偏心距的增加而增加,达到最大值后泄漏量逐渐减小并趋于不变;在偏心和非偏心工况下,隔板汽封泄漏量在一定转速内皆随着转速的增加而降低。Through employing the RNG κ-ε turbulence model and basing on the finite volume method to re- solve the 3D compressible Reynolds time-averaged N-S equations, the influence of both eccentric distance and rotational speed on the leakage of diaphragm seal was simulated. The results show that, under the same seal clearance and within a certain range of rotor eccentricity, the leakage flow becomes larger with the increase of the eccentricity; and when the leakage flow comes to the maximum value, it gradually decreases and tends to a stable value; when the rotor is at the eccentric and non-eccentric conditions, the diaphragm seal leakage flow within certain speeds reduces with increasing speed.

关 键 词：汽轮机 隔板汽封间隙 偏心距 转速 泄漏量 

分 类 号：TQ051.6[化学工程]