摘要
在对射流进行非定常CFD解析的基础上,提出了射流直径的计算公式和射流形状的统计预测方法,并由时间平均的射流形状确定了缩流位置、膨胀率等用于设计的重要参数。
Based on a numerical simulation of nozzle jet flow, th e unsteady characteristics of the jet flow was investigated statistically. The r adius of water jet at the relevant sections was obtained by the distribution of kinetic energy along the radial coordinate. In order to sharpen the resolution o f the interface between the water and air, the volume of fluid was used as a wei ght for the kinetic energies in the grid cells. From the time-averaged jet geom etry thus acquired, the important design parameters of the jet contraction posit ion, its radius and velocity as well as the expansion rate of jet radius were pr edicted numerically.
出处
《水电能源科学》
2005年第3期14-16,i003,共4页
Water Resources and Power
基金
国家自然科学基金资助项目(50379015)
关键词
冲击式水轮机
非定常数
射流
多相流
数值解析
Pelton turbine
unsteady flow
jet flow
multiphase flow
numerical analysis
