化工学报Issue(2)：501-507,7.DOI:10.3969/j.issn.0438-1157.2014.02.019
轴流泵叶顶区的空化流场与叶片载荷分布特性
Cavitation flow and blade loading characteristic in impeller tip region of axial flow pump
摘要
Abstract
In order to take into account the local density of gas-liquid mixing area in cavitation flow field in impeller tip region of axial flow pump, the turbulent viscosity term in SST k-ωturbulence mode was corrected. NPSH curves, cavitation characteristic and blade loading were analyzed based on full cavitation model with simulation and experimental methods. The investigation results show that the modified SST k-ωturbulence model and cavitation model can predict the cavitation flow field with gas-liquid two-phase flow in the impeller tip region, and the relative error of the critical cavitation number between experimental and predicted values is 7.79%under design conditions, which is satisfactory for the computational accuracy. The high speed phohography experiments show that the cavitation inception is induced by blowing cavitation, clearance attached cavitation and tip leakage vortex cavitation, and the cavitation region continually spreads with the decrease of cavitation number. The break of cavitation bubble cluster occurs at the aft of the blade, and the position of bubble break moves toward the middle of the blade span. The angular interval between-13° and+13° is the main region of the suction side with low pressure. Within the 3% area attached to the blade tip clearance, the pressure gradually decreases with the increase of radius coefficient r*, decreasing the blade surface loading. Near the tip clearance, the blade loading decreases more obviously.关键词
轴流泵/空化/叶片载荷/数值模拟/高速摄影Key words
axial-flow pump/cavitation/blade loading/numerical simulation/high speed photograph分类
机械制造引用本文复制引用
张德胜,潘大志,施卫东,邵佩佩,王海宇,李通通..轴流泵叶顶区的空化流场与叶片载荷分布特性[J].化工学报,2014,(2):501-507,7.基金项目
国家自然科学基金项目（51109093）；江苏省自然科学基金项目（BK2011503）。@@@@supported by the National Natural Science Foundation of China (51109093) and the Natural Science Foundation of Jiangsu Province(BK2011503) （51109093）
