农业工程学报2012，Vol.28Issue(13)：88-93,295,7.DOI:10.3969/j.issn.1002-6819.2012.13.015
轴流泵叶轮区域空化特性数值模拟
Numerical simulation on cavitating characteristic in impeller of axial-flow pump
摘要
Abstract
In order to study the internal cavitation characteristic of axial flow pump, the steady turbulent flow field of an axial flow pump(ns=1033) at different conditions was simulated by using standard K-Ε turbulence model, RNG K-Ε turbulence model, K-Ω turbulence model, SST K-Ω turbulence model and homogeneous multiphase model based on ANSYS CFX software. The numerical results were compared with the experiment values to verify the adaptability of the different turbulent models and multiphase model, and to study the cavitation characteristics of the impeller region. The results showed that the K-E turbulence model has better accuracy than the other three turbulent models in simulation, predictive errors of critical NPSHc is 6.32%,which can reflect the internal cavitation characteristic of the axial flow pump well. With the decrease of the NPSH, along the flow direction, vapor first occurred on the leading edge of the blade close to the tip, and then developed to the middle area of the blades until to the whole passage. On the critical cavitation condition, the vapor area of the middle side along the radical direction of the blade is large. When the cavitation is serious, the streamline at the back of the blade's suction side is disorder and generate the vortex micro group, which will flow from the hub to the shroud of the impeller, cause the distribution of axial flow velocity at the outlet of the impeller inhomogeneous, and increase the disturbulence of the flow field in impeller region. These phenomena reveal the cavitation characteristics of the axial-flow pump.关键词
轴流泵/空化/湍流/模型/数值模拟Key words
axial-flow pump/ cavitation/ turbulence/ model/ numerical simulation分类
农业科技引用本文复制引用
施卫东,李通通,张德胜,王国涛,周岭..轴流泵叶轮区域空化特性数值模拟[J].农业工程学报,2012,28(13):88-93,295,7.基金项目
国家自然科学基金资助项目(51079063,51109093) （51079063,51109093）
江苏高等学校优秀科技创新团队项目(苏教科(2009) 10号) （苏教科(2009）
江苏省自然科学基金(BK2011503) （BK2011503）
国家博士后科学基金(2011M500117) （2011M500117）
江苏省博士后基金(1101019B). （1101019B）
