离心叶轮局部粗糙度对其气动性能的影响  

Effect of Local Roughness Distribution on the Aerodynamic Performance of a Centrifugal Impeller

作　　者：赵晨曦 张晨庆 席光[1] 王志恒[1] ZHAO Chenxi;ZHANG Chenqing;XI Guang;WANG Zhiheng(School of Energy and PowerEngineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《工程热物理学报》2023年第2期349-357,共9页Journal of Engineering Thermophysics

基　　金：国家重大科技专项(No.2017-Ⅱ-0002-0014)。

摘　　要：离心叶轮的气动性能对压缩机整体性能具有重要影响。为了研究局部表面粗糙度使离心叶轮性能恶化的程度及其作用机理,本文采用数值模拟方法将Krain叶轮的流道表面划分成若干区域,并设置不同方案在局部施加粗糙度进行研究。结果表明:粗糙的叶片比粗糙的轮盘和轮盖更能使叶轮性能发生恶化,设计点级的等熵效率比光滑条件下降2.466%,总压比下降了6.266%,同时阻塞流量降低了2.227%;轮盖粗糙度通过改变叶顶间隙泄漏流来改变叶片载荷分布;前缘粗糙度加大了边界层和激波相互作用的程度使流道更容易阻塞;叶轮性能对吸力侧粗糙度比对压力侧更敏感。The aerodynamic performance of centrifugal impeller has an important influence on the overall performance of compressor. To investigate the deterioration degree of centrifugal compressor caused by local surface roughness and its mechanism, the flow passage of Krain impeller was divided into several regions by numerical simulation method. Besides, different schemes were set to research the object. The results show that the rough blades are more likely to deteriorate the impeller performance than the rough hub and shroud. The isentropic efficiency at the design point decreases by 2.466% compared with the smooth condition, and the corresponding total pressure ratio decreases by 6.266%. The choke flow rate decreases by 2.227%. The roughness on the hub changes the blade load distribution by affecting the tip clearance leakage flow. The roughness on the leading edge of impeller increases the interaction between boundary layer and shock wave, making the flow passage more easily blocked. Additionally, the performance of the impeller is more sensitive to the roughness on the suction side than that on the pressure side.

关 键 词：局部粗糙度 Krain叶轮 气动性能 

分 类 号：TH452[机械工程—机械制造及自动化]