华中科技大学学报（自然科学版）2013，Vol.41Issue(4)：21-25,5.
不同叶顶间隙对轴流泵空化性能及流场的影响
Effect of tip clearance on the cavitation and flow field of axial flow pumps
摘要
Abstract
To carry out the adaptability study of cavitation calculation for the model pump under three typical flow conditions, the development characteristics of cavitation of impeller area was explored, and the axial flow pump cavitation characteristics under different tip clearance S (0. 50, 1. 50 and 3. 00 mm) were comparative analyzed. The effects on cavitation characteristics and flow field of axial flow pump for the value of tip clearance were compared through making the numerical analysis and experimental study of full passage using scaling the model pump of south-to-north water transfer project for equal ration. The results show that the cavitation occurs at the blade inlet edge close to the tip clearance firstly with the reduction of cavitation number σ, and expands gradually to the outlet edge of blade, meanwhile to the suction surface of blade along radial direction and eventually occupies the entire suction surface of blade, causing the axial velocities of blade outlet edge close to 10% area of tip clearance decrease gradually. The critical cavitation number of model pump increases with the increase of tip clearance. The cavitation damage of cylindrical section of blade rim becomes serious gradually and moves from the front to the tail of blade with the increase of tip clearance, and the low velocity areas of axial velocity for blade outlet are mainly concentrated in the region of blade near 10% clearance. This process reveals the interior cavitation characteristics of axial flow pump with different tip clearance.关键词
轴流泵/间隙空化/叶顶间隙/流场结构/空化特性/数值模拟Key words
axial-flow pump/ leakage cavitation/ tip leakage/ flow field structure/ cavitation charac-tersitic/ numerical simulation分类
机械制造引用本文复制引用
施卫东,李通通,张德胜,李辉..不同叶顶间隙对轴流泵空化性能及流场的影响[J].华中科技大学学报（自然科学版）,2013,41(4):21-25,5.基金项目
国家自然科学基金资助项目(51079063,51109093) （51079063,51109093）
江苏省自然科学基金资助项目(BK2011503) （BK2011503）
江苏省科技成果转化专项资助项目(BA2011126) （BA2011126）
江苏省高校优势学科建设工程资助项目(PAPD). （PAPD）
