分流叶片对离心泵空化性能影响的数值预报  

Numerical prediction of the influence of flow-splitting blades on cavitational performance of centrifugal pump

作　　者：赵伟国[1,2] 咸丽霞 赵国寿 潘绪伟[1] ZHAO Wei-guo;XIAN Li-xia;ZHAO Guo-shou;PAN Xu-wei(College of Energy and Power Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and System of Gansu Province,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学甘肃流体机械及系统重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2019年第4期56-62,共7页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51269011)

摘　　要：为研究分流叶片对离心泵空化性能的影响,采用Zwart-Gerber-Belamri空化模型对无分流叶片及4种具有相同分流叶片进口直径、不同偏置度的叶轮方案进行了数值模拟.结果表明:加分流叶片方案可使扬程提高10.81%~19.97%,分流叶片可使效率在小流量工况有一定程度的提高.加分流叶片方案的流道内气泡均有不同程度的改善,且空泡的体积变小,表明分流叶片可以抑制空泡的生长,分流叶片不同的偏置角度对空泡的抑制程度不同,偏置角度为6°时改善效果最为明显.加分流叶片方案的流道内流动更加稳定,分流叶片有效阻止了长叶片背面上流体的分离和脱流,改善了流道内的流线分布,当分流叶片偏置角度为6°时,叶轮流道内流线分布更均匀,出口的漩涡较小.In order to investigate the influence of flow-splitting blade on cavitational performance of centrifugal pump,an impeller without flow-splitting blade and other four with flow-splitting blade of identical inlet diameter and different offset location were simulated by means of Zwart-Gerber-Belamri cavitation model.The result showed that the option of addition of flow-splitting blade could make the lift of pump improved by 10.81% to 19.97% and its efficiency improved to a certain extent under condition of small flow rate.The cavity in flow channel would have an improvement to various extent and the cavity volume would become small,showing that the flow-splitting blade could inhibit the development of the cavity.The suppression extent would be different under condition of different offset angles of flow-splitting plade and its improvement result would be remarkable when this angle was 6°.The flow would be more stable in flow passage of pump impeller schemes with flow-splitting blades;the flow-splitting blade would prevent the flow separation from back surface of primary blade and improve streamline distribution in flow passage.The streamline distribution there would be more homogeneous and the vortex at impeller outlet would be less when offset angle was 6°.

关 键 词：分流叶片 空化性能 离心泵 空泡分布 

分 类 号：TH311[机械工程—机械制造及自动化]