离心压缩机变工况下流道分离损失的分析  

Analysis of Flow Separation Loss of Impeller in Centrifugal Compressor under Variable Conditions

作　　者：蔡斌[1] 苏永升[1] 张振乾[2] 王继祥[2] 

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]华东理工大学,上海200237

出　　处：《煤矿机械》2016年第6期66-68,共3页Coal Mine Machinery

摘　　要：为了研究变工况对离心压缩机叶轮流场的影响,通过改变离心压缩机进口流量大小以及改变离心压缩机叶轮旋转速度,采用realizableκ-ε二方程模型对离心压缩机全流道进行定常数值模拟。计算得到不同进口流量和旋转速度下的离心压缩机内部流场的相对速度分布情况,同时采用分离损失度概念分析叶轮流道内分离损失的情况。结果表明,在变工况情况下叶轮冲角的变化是导致分离损失产生的首要因素,而当冲角相同的时候,相对速度越小,分离损失度越大。因此在实际生产过程中,为了减小分离损失,应适当减小冲角大小,增大进口流量或者叶轮旋转速度。In order to study the change condition of the influence on the centrifugal compressor blade field,we change the size of the centrifugal compressor inlet flow and the centrifugal compressor impeller rotational speed,using the realizable K-8 11 equation model to do the steady numerical simulation for the full port of centrifugal compressor.Through calculation, we get different inlet flow and rotate speed of centrifugal compressor internal flow field distribution of relative velocity, at the same time using the concept of degree of separation Loss to analyze the separation loss within impeller passage. The results show that under the condition of variable working condition,the change of angle of attack is the primary factor for the the impeller separation,and when the angle of attack of the same time, the smaller the relative velocity, the greater the separation loss. Therefore in the process of actual production, in order to reduce the loss of separation,should reduce the size of angle of attack, appropriatly increase import flow or impeller rotational speed.

关 键 词：离心压缩机 冲角 分离损失度 当量体积 数值模拟 

分 类 号：TH452[机械工程—机械制造及自动化]