摘要
为了探究簸萁形进水流道进水收缩段底面倾角对流道水力性能的影响,建立了簸萁形进水流道的进水结构物理模型和水动力学模型,采用雷诺N-S方程和RNGκ-ε湍流模型,对进水收缩段5种不同底面倾角的流道水流流场进行数值模拟。结果表明,底面倾角对流道进水收缩段和喉部的流速分布影响较大,较大的底面倾角使进水收缩段的流线分布密集度和喉部流线弯曲度增大、流速升高,增大了流道水力损失,降低了流道出口断面流速分布的均匀度;较小的底面倾角使进水收缩段的流线分布平顺和喉部流线弯曲度变缓、流速降低,减小了流道水力损失,提高了流道出口断面的流速分布均匀度;进水收缩段底面倾角的大小对流道出口断面的水流速度加权平均角无明显影响;分析不同底面倾角的流道水力性能,在簸萁形进水流道的进水收缩段底面倾角≤3°时,进水流道的水流平顺,水力损失小,流道出口的水流流态满足水泵叶轮室进口的进水条件。
In order to investigate the influence of the bottom dip angle of contraction section of the dustpan-shaped inlet on the hydraulic performance of the passage, the physical model and hydrodynamic model of the inlet structure of the dustpan-shaped inlet were established. The Reynolds N-S equation and RNG κ-ε turbulence model were adopted to simulate the flow field of the passage with 5 different underside inclinations in the inlet contraction section. The results show that the bottom dip angle increases has a great influence on the velocity distribution of the inlet contraction section and the throat of the winnowed dustpan-shaped inlet passage, and the scheme of the bottom dip angle increases the density of the srteamline distribution and the curvature of the throat, with the increase of flow velocity, the hydraulic loss of the passage is large, and the velocity distribution uniformity of the outlet section of the passage is low;The scheme with small bottom dip angle makes the streamline distribution smooth and the throat streamline curvature becomes slow, the velocity decreases, the hydraulic loss of the passage reduces, and the velocity distribution uniformity of the outlet section of the passage increases;The magnitude of the inclination of the bottom surface of the intake contraction section has no obvious influence on the weighted average angle of the flow velocity of the outlet section of the passage. Hydraulic performance of passage with different bottom dip angles was analyzed. When the bottom dip angle of the inlet contraction section of the dustpan-shaped inlet passage is less than 3°, the water flow in the inlet passage is smooth, the hydraulic loss is small, and the flow pattern at the outlet of the passage meets the water inlet conditions of the pump impeller chamber.
作者
高志锴
汪顺生
刘新阳
高传昌
GAO Zhi-kai;WANG Shun-sheng;LIU Xin-yang;GAO Chuan-chang(Sschool of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)
出处
《水电能源科学》
北大核心
2023年第2期117-120,共4页
Water Resources and Power
基金
国家自然科学基金项目(51309099,52079051)。
关键词
簸箕形
进水收缩段
倾角
数值计算
水力性能
dustpan shape
inlet contraction section
dip angle
numerical calculation
hydraulic performance
