摘要
为研究冲击式水轮机斗叶内泥沙颗粒的运动特性,分析其对斗叶内壁面的冲蚀磨损影响,建立了斗叶的三维数学模型。利用FLUENT软件,对连续相使用欧拉方程进行计算,达到收敛后再选用拉格朗日方程对离散相-泥沙颗粒进行固液耦合计算。数值分析得出:在相同泥沙颗粒直径和浓度条件下,冲击速度越大,斗叶内壁面的冲蚀磨损也越大;在相同冲击速度和浓度条件下,颗粒直径越大,冲蚀磨损越大;相同泥沙颗粒冲击速度和直径条件下,浓度越大,冲蚀磨损也越大。研究表明,斗叶内壁面的冲蚀磨损主要由泥沙颗粒直径、冲击流速和浓度共同决定。
A 3-D model of Pelton turbine bucket is built for researching the motion characteristics of sediment particles in the bucket and the influence on inner erosion of bucket. With fluid analysis software FLUENT, an Euler equation is firstly calculated for the continuous phase turbulence model to achieve convergence, and then the coupled calculation of solid-liquid two-phase is conducted with DPM model. The results show that： （a） the greater impact velocity will lead to more serious erosion in inner wall of bucket under same sediment particle diameter and concentration; （b） the bigger particle diameter will lead to greater erosion under same impact velocity and sediment concentration; and （c） the higher sediment concentration will also lead to more serious erosion under same particle impact velocity and diameter. The erosion of inner wall of bucket is mainly determined by the combining effects of sediment particle diameter, impact velocity and concentration.
出处
《水力发电》
北大核心
2014年第7期75-78,85,共5页
Water Power
基金
流体及动力机械教育部重点实验室资助项目(SBZD-PY-11-8
SBZDPY-11-4
SZJJ2013-011)
四川省教育厅重点资助项目(11ZA279)
关键词
斗叶
冲蚀磨损
冲击式水轮机
固液耦合
数值分析
bucket
erosion
Pehon turbine
solid-liquid two-phase flow coupling
numerical analysis
