黏性耗散对离心压缩机气动性能的影响  

Effection of Viscous Dissipation on Flow Performance of Centrifugal Compressor Stage

作　　者：刘正先[1] 吴仲义[1] 王桂林[1] 

机构地区：[1]天津大学机械工程学院力学系,天津300072

出　　处：《工程热物理学报》2011年第4期593-596,共4页Journal of Engineering Thermophysics

基　　金：博士点基金资助项目(No.20060056005)

摘　　要：针对小流量系数离心压缩机,考察了流体的黏性耗散效应对流动损失的影响程度。通过压缩机模型级的实验测量和数值模拟,分别分析了压缩机级和叶轮在有、无黏性耗散影响下的流动性能。结果表明:当不考虑黏性耗散损失时,压缩机模型级具有较高效率;在黏性耗散效应的影响下,流动的多变效率约降低8个百分点。另外,不同的机壳间隙对多变效率也存在2～4个百分点的影响,但是叶轮总压升则不受黏性耗散效应的影响。结果证明黏性耗散损失是造成小流量系数离心压缩机流道中气流机械能转换为热能,从而使效率降低的重要原因。To understanding the lower aerodynamic performance of centrifugal compressor stage with small design flowrate,the flow loss generated by viscous dissipation was investigated using the CFD method.Based on the test and the numerical simulation results of the actual compressor stage, the contours of temperature,the profiles of efficiency and pressure ratio for the model stage and impeller were analyzed.It indicated that the stage shown higher efficiency under taking no account of viscous dissipation,reversed,the efficiency would be decreased with 8 percentage points.The value of clearance between case and impeller took about 2～4 percentage points change to the stage efficiency. The total pressure ratio was hardly affected by viscous dissipation as the stage efficiency.The results indicate that viscous dissipation works as an important role to decrease the compressor efficiency with small design fiowrate.

关 键 词：离心压缩机 小流量系数 数值模拟 黏性耗散 气动性能 

分 类 号：TK474[动力工程及工程热物理—动力机械及工程]