Research On Flow Pattern Optimization And Noise Of Circulating Water Channel Based On Star-CCM

The Circulating Water Channel is a hydrodynamic test facility that uses pumps to provide power to promote the circulation of water.It has been widely used in hydrodynamic experiments in the fields of ocean engineering and ship science.Current research on Circulating Water Channel is mainly focused on optimizing the curve function of the constricted part of the boundary,the honeycomb structure type,and the shape of the guide vane to obtain better speed uniformity in the test section,but the overall simulation of the three-dimensional Circulating Water Channel and the water tank There is little research on noise in pipelines.In order to improve the uniformity of the water flow in the experimental area and a low-noise environment,it is of great significance to study the three-dimensional circulation tank simulation,rectification and internal radiation noise of the circulation tank pipeline.This paper first verifies the convergence of the two-dimensional and three-dimensional circulating flume grids respectively,and studies the wing straight-edge section type deflector and the wing section type deflector,the bicubic contraction section and the wing section in the two-dimensional and three-dimensional calculation domains.The effect of the contraction section of the Vickers curve on the flow uniformity of the flow field.The simulation results show that the straight-side profile vane and the bicubic contraction section of the wing have better effects on the flow uniformity of the flow field;choose the best guide vane,A two-dimensional overall model of the Circulating Water Channel was constructed in the contraction section,and the effect of the presence or absence of the honeycomb on the uniformity of the water flow in the experimental section of the water tank was compared.The results showed that the addition of the honeycomb can improve the uniformity of the water flow in the experimental section.Simulate the three-dimensional structure of the honeycomb and determine the properties and parameters of the honeycomb.Next,this paper uses the 3D local simulation results to establish a three-dimensional tank model,and simulates the presence or absence of honeycombs and the position of the honeycombs in the whole tank with the velocity inlet and pressure outlet boundary conditions.The results show that the honeycombs are too close to the deflector.It will cause local water congestion.The addition of honeycombs can not only improve the uniformity of water flow in the experimental section of the sink,but also improve the phenomenon of water flow deviation;the four-sided diffusion of the sink is optimized to three-sided diffusion,and the square straight pipes at the first and second corners are optimized as diffusion sections.Eliminate the phenomenon of water flow in the pipeline;use the momentum source of the fan to provide power for the closed three-dimensional water tank.The simulation results show that the square pipe between the third and fourth corners has turbulence after the fan is added,and the uniformity of the water flow in the acoustic window area is reduced.A cross baffle was added to the water tank to run through the entire square pipe.The simulation results showed that the turbulence of the water flow in the pipe was reduced,and the water flow uniformity in the acoustic window area was greatly improved,which met the design requirements.By using the velocity inlet and pressure outlet boundary conditions to simulate the noise in the experimental section of the three-sided diffusion circulating flume,the results show that the addition of a cross baffle can effectively reduce the noise sound pressure level of the experimental section.