Numerical simulation and analysis of solid-liquid two-phase threedimensional unsteady flow in centrifugal slurry pump

Based on RNG k-ε turbulence model and sliding grid technique, solid-liquid two-phase three-dimensional(3-D) unsteady turbulence of full passage in slurry pump was simulated by means of Fluent software. The effects of unsteady flow characteristics on solid-liquid two-phase flow and pump performance were researched under design condition. The results show that clocking effect has a significant influence on the flow in pump, and the fluctuation of flow velocity and pressure is obvious, particularly near the volute tongue, at the position of small sections of volute and within diffuser. Clocking effect has a more influence on liquid-phase than on solid-phase, and the wake-jet structure of relative velocity of solid-phase is less obvious than liquid-phase near the volute tongue and the impeller passage outlet. The fluctuation of relative velocity of solid-phase flow is 7.6% smaller than liquid-phase flow at the impeller outlet on circular path. Head and radial forces of the impeller are 8.1% and 85.7% of fluctuation, respectively. The results provide a theoretical basis for further research for turbulence, improving efficient, reducing the hydraulic losses and wear. Finally, field tests were carried out to verify the operation and wear of slurry pump.

水布垭工程泄洪波浪对电站机组运行影响研究

清江水布垭水利枢纽是清江干流梯级开发最上一级水电枢纽工程。对电站尾水洞比较了直尾水洞和弯尾水洞两种布置形式。直尾水洞方案出口处水位波动较大,通过模拟计算、三维流仿真计算、水工模型试验,深入研究了泄洪波浪对机组和电网的稳定运行、机组出力和转速波动的影响,以及泄洪波浪引起的压力波动在尾水洞中的传递规律。