Numerical Simulation Of Internal Flow Field And Separation Performance Study In New-style Water Intake Head With Inclined Vane Plates

In modern society that builds low carbon economy and promotes sustainable development, as a reliable, energy efficient and carbon reducing renewable energy application technology, the water source heat pump technology (WSHP) has been developed rapidly in recent years in China. Sufficient water source and good water quality condition are the basic conditions for application of WSHP technology. Based on application of WSHP technology in Chongqing city, from the perspective of computational fluid dynamics, this paper studies the internal flow field and separation performance of the new water intake head with inclined vane plates designed for high sediment concentration in Jialing River and Yangtze River water, and discusses the performance of the new water intake head with inclined vane plates removing solids under the different inlet water velocity, the different density contrast, and the different structural parameters.In this paper, through studying the liquid-solid two-phase flow theory and analyzing the basic equations of computational fluid dynamics, the numerical simulation method for solid-liquid two-phase flow in the water intake head with inclined vane plates by use of turbulent Reynolds Model and Discrete Phase Model was established, the separation performance and internal flow field of the new water intake head based on the designed structural parameters of pilot-plant are simulated.By calculating the separation efficiency of single size particles in the new water intake head with inclined vane plates, its separation efficiency diagram was obtained. The results showed that the removal efficiency of particle that its size is more than 10 micron, can reach above 40% in this new water intake head. The computational flow field results showed that the internal flow field in the new water intake head with inclined vane plates is obvious parallel flow and annular flow., and the water velocity of annular flow in vane grid region is much lower than that of parallel flow in mainstream area, which is very favorable to remove sand and other solid particles in vane grid region. By comparing the removal efficiency under the conditions of different inlet water velocity and solid-liquid two phase density contrast, we found that water velocity and density contrast have great influence on the removal efficiency of this new water intake head. The laws of the new water intake head removing solid particles were compared with experiment results, which proved that the results of numerical calculation were almost the same as experiment results, and proved that our computation model and numerical calculation solution is correct.The separation performance of water intake head with inclined vane plates removing particles influenced by its main structural parameters, including vane number N, vane width B, inclined plate width h, and inclined plate tilt angleθwas studied by use of the correct calculation model and numerical simulation solution that had been confirmed. Through qualitative analysis, the optimum structural parameter values to make effluent water contain minimum particles were obtained.In this paper, we established a numerical calculation method of studying the internal flow field of the new water intake head with inclined vane plates and solid-liquid two phase separation efficiency of solid particles under the conditions of pressure flow, which provides a new idea and reliable methods for similar research on the performance of water intake head and has certain reference value in actual engineering design.