Study On Numerical Simulation Of Flow Field In Intake Channel And Forebay Of Pumping Station

Intake channel and forebay of pumping station is an important component part of the pumping station. The hydraulic characteristics of inlet have the effects on pump performance. In certain situations,intake channel and forebay could make flow in the bad flow pattern, such as deviation, flow separation, circulation, vortex and so on. These bad flow patterns will seriously affect the flow pattern in intake channel and forebay, inducing the decline of energy performances and cavitations of pump, even cause cavitations and vibration of pump. Meanwhile backflow also leads to local sedimentation in forebay, which has further aggravated the development of bad flow pattern. Bad flow pattern in intake channel and forebay can be improved by the engineering measures.Model tests are good visual but spend lots of fund and time. At present, the computational fluid dynamics (CFD) technology is widely used to analysis and research on the flow pattern in the field of a pumping engineering. The present article takes the intake channel and forebay of pumping station as an example, and selects three kinds of k -εmodels to simulate flow pattern of the intake channel and forebay based on the FLUENT platform. According to the comparisons and analysis between model test and numerical simulations, the RNG k -εmodel is adapted to made a comprehensive numerical simulations study on the flow pattern of the intake channel and forebay, and finally obtain the three dimensional flow fields of different alterations.According to the characteristics of the flow field in intake channel and forebay, the affection of the size, the quantity, the location of bottom sills and diversion pier on flow pattern was analyzed in detail. The size of bottom sills is the main factor in all elements. The short vertical wall have no affection to improve the flow pattern of outlet.In order to acquire the good flow pattern, an optimized design of improving the flow pattern based on the results of the distribution factor of the velocities in the outlet is presented in this paper. The short vertical wall have no affection to improve the flow pattern of outlet.