Three Dimensional Numerical Simulation Of Contact Beam Impact On Flow At The Power Plant Intake

In the past, most researchers simplified and reduced the calculation of boundary when theydid some numerical simulations of the power station inlet. For example, they don’t consider theimpact of contact beams, trash rack slot, bulkhead gate and operating gate. But these simplifiedstructures will often affect the internal flow pattern and the head loss. Moreover, its accuracy willbe reduced if non-structure grid have been adopted or the grid resolution isn’t fine.In this paper, under the background of a power station, the scope of simulation, controlcondition and research methods are determined. And1:30scale model has been used to study thehydraulic characteristics of the power plant intake. Then it also provides foundations to theverifications of numerical simulations’s results.On the basis of physical model tests, reasonable numerical simulation scope of the powerplant intake has been determined and the appropriate boundary conditions have been given out.Hexahedral structured grid and non-docking grid processing technology are introduced to ensurethe accuracy and use the different calculation area density meshing manner. It simulates thehydraulic characteristics of the contact beam layout type in the power plant intake usingthree-dimensional k-εturbulence model and VOF model of two phase flow. A comparativeanalysis of inlet flow pattern, the head loss and velocity distribution has been put forward.Studies show that:(1)The numerical models have simulated vary layout types of contact beam of the powerplant intake. And it also provide support to the impact assessment of flow pattern, head loss andpressure distribution law if the contact beam is built in the intake of power station.(2)The contact beam has little influence on the center plane flow pattern. The upper beamhas more more influnce on the inlet flow patten than the middle and lower beam. The bottomlayer of contact beam has a relatively large influence on the head loss, it may loss of3cm head ofwater. The contact beam hardly affect the pressure distribution. The vertical velocity distributionunder vary work status shows that the middle section is large and the surface is minimum. Andflow velocity near the contact beam is significantly reduced.(3)The numerical simulation and the research findings in this paper may available forsimilar projects refence.