摘要
为了分析簸箕形进水流道的进口收缩段宽度变化对流道内水流流态的影响,设计了进口收缩段为渐扩形、直线形和渐缩形三种宽度变化的簸箕形进水流道方案。基于三维不可压缩流体的雷诺平均N-S方程,选择VOF模型和RNG k-ε模型,采用SIM⁃PLEC算法,模拟了设计工况下三种簸箕形进水流道方案的三维流场。结果表明:三种流道形式设计都是合理的,其中渐扩形簸箕形进水流道水流流态稍优于直线形簸箕形进水流道,而直线形稍优于渐缩形簸箕形进水流道水流流态。在相同运行工况下,三种簸箕形进水流道进口收缩段流道宽度变化影响了流道内的水流速度、流线和涡量的分布,且均能保证进水流道内良好的水流特性,经过喇叭管的整流,达到了较为理想的水力优化目标值。
For analyzing the influence of width changes in inlet contraction section of dustpan-shaped inlet conduit to the flow characteristics,there designed three groups of width changes of the inlet contraction section:progressive enlarged type,linear type and progressive contracted type.Based on the Reynolds average N-S equation of three⁃dimensional incompressible fluid,the numerical simulation used VOF model and RNG k-εturbulent flow model and adopted the SIMPLEC algorithm.The result shows that the design of three groups of inlet conduit is rea⁃sonable,among which the flow characteristics of the progressive enlarged type is slightly better than that of the linear type,and the linear type is slightly better than the progressive contracted type.Under the same operating conditions,the change in the width of the inlet contrac⁃tion section in three design schemes affects the flow velocity,streamlines and vorticity contours in the inlet conduit and can ensure better flow characteristics in the inlet conduit.Through the rectifying action of the flare tube,the ideal hydraulic optimization target value is achieved.
作者
高传昌
孙龙月
董旭敏
GAO Chuanchang;SUN Longyue;DONG Xumin(Institute of Electric Power,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)
出处
《人民黄河》
CAS
北大核心
2020年第1期91-96,104,共7页
Yellow River
关键词
簸箕形进水流道
流道宽度
数值模拟
流态
dustpan⁃shaped inlet conduit
width of inlet conduit
numerical simulation
flow characteristics
