卧式泵站竖井进水流道三面进水水力特性数值模拟

针对某单向卧式引水泵站采用的竖井式进水流道进行优化设计,提出三面进水竖井进水流道,为分析三面进水下竖井进水流道的水力特性,基于雷诺时均N-S方程和k-ε标准湍流模型,采用CFD技术对该卧式泵站的三面进水竖井流道进行数值模拟,通过控制中墩的线型以及中墩宽度b形成不同的三面进水流道,从而分析不同三面进水流道的水力特性,具体分析不同方案进水流道出口断面的轴向速度分布、水平剖面的流线和速度分布以及流道水力损失的状况.研究结果表明:对于不同中墩宽度下的三面进水流道,流线型中墩较矩形中墩其流速分布均匀度和速度加权平均角均较大,采用流线型中墩可以获得较好的流态;对于流线型中墩,随着中墩宽度b的减小,过水断面面积逐渐增大,各方案流速分布均匀度和速度加权平均角逐渐增大,当b=0.075B时,此时流线型中墩泵进口断面上的压力分布较矩形中墩更为均匀.

Numerical simulation of hydraulic characteristics of three-side inlet of vertical shaft inlet channel of horizontal pumping station

Aiming at the optimization design of the vertical shaft inlet passage adopted by a one-way horizontal diversion pump station, a three-side inlet shaft inlet passage is proposed. In order to analyze the hydraulic characteristics of the three-side inlet shaft inlet passage, based on the Rey-nolds time-averaged NS equation and k-ε standard turbulence model, the CFD technology is used to numerically simulate the three-side inlet shaft flow channel of the horizontal pumping station, and different three-side inlet channels are formed by controlling the line type and the width b of the middle pier, so as to analyze. The hydraulic characteristics of the different three-side inlet channel, specifically analyze the axial velocity distribution of the outlet section of the inlet flow channel of different schemes, the streamline and velocity distribution of the horizontal section, and the flow channel hydraulic loss. The results show that for the three-side inlet channel under different widths of the middle pier, the streamlined middle pier has a larger flow velocity distribution uniformity and the velocity-weighted average angle than the rectangular middle pier. The streamlined middle pier can obtain a better flow pattern. The streamlined middle pier, as the width b of the middle pier decreases, the cross-sectional area gradually increases, and the uniformity of the flow velocity distribution and the speed weighted average angle of each scheme gradually increase. When b=0.075B, The pressure distribution on the inlet section of the is streamlined middle pier pump more even than that of the rectangular middle pier.