摘要
空化和空蚀是影响水力机械能否安全、经济运行的主要因素之一.为了研究新的翼型结构——多孔翼型对于水力机械的空化及空蚀现象的影响,利用PROE建立具有不同微孔数的翼型模型,再借助Fluent软件对多孔翼型的三维绕流流场进行了定常数值模拟计算.基于伯努利定律,对具有不同孔数的翼型绕流流场进行流态分析.根据模拟结果显示的不同翼型结构的速度场和压力场的分布特征,从能量转换的角度出发,揭示了多孔翼型绕流流场的内在特性,即绕流翼型的流场(速度场、压力场)是随着孔数而变化的.结合空化发生的条件,说明采用多孔翼型结构对改善水力机械内部空化现象是有一定的作用的,通过数值模拟方法来分析研究水力机械内部的空化空蚀现象,可以作为实验与理论分析的参考.从一个新的角度,为改善水力机械的空化和空蚀现象提供了新思路.
Cavitation and erosion are the key factors to determine the safe and economic run of hydraulic machine.In order to study the new hydrofoil structure-porous hydrofoil's effect on the cavitation and erosion in hydraulic machine,hydrofoil models with different hole numbers are established by use of PROE,and the dimensional steady flow fields of porous hydrofoils are simulated by using Fluent software.Based on the law of Bernoulli,the flow field status of hydrofoil with different hole numbers is analysed.According to the distributed characteristic of velocity and pressure field around different hydrofoil,the inner features of porous hydrofoil is revealed,that is the flow field(velocity and pressure field)is changing with hole numbers.Considering the cavitation conditions,it is obvious that porous hydrofoil is useful to improve the cavitation phenomenon in hydraulic machine.The analytical result of cavitation and erosion in hydraulic machine by numerical simulation can be considered as reference to experimental and theoretical analysis.This paper provides a new method to improve cavitation and erosion phenomenon.
出处
《固体力学学报》
CAS
CSCD
北大核心
2014年第S1期59-63,共5页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金项目(51279071,51469011)
高等学校博士学科点专项科研基金项目(20135314130002)
云南省教育厅科学研究基金项目(2012Y546)资助
关键词
水力机械
翼型
数值模拟
空化
hydraulic mechanic,hydrofoil,numerical simulation,cavitation
