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基于k-ε紊流模型,采用Fluent软件对电站常用的G4-73型离心风机进行全三维数值模拟,模拟结果表明离心风机蜗壳内存在向前螺旋推进的大尺度漩涡。设计了一种漩涡破碎装置,进行加装装置前后的性能实验和噪声实验。实验结果表明,加装旋涡破碎装置后,相对流量大于45%时,风机全压明显增大,且高效区拓宽;当相对流量小于100%时,风机噪声降低,且在最高效率点处,风机中、低频段噪声明显降低。该旋涡破碎装置的设计对电厂的节能降噪及解决风压不足等问题具有一定的指导意义。
Based on the k-ε turbulence model, the Fluent software is used to simulate the three-dimensional numerical simulation of the G4-73 centrifugal fan commonly used in power plants. The simulation results show that there is a large-scale vortex advancing forward in the centrifugal fan casing. A vortex crushing device was designed to carry out the performance experiment and the noise experiment before and after the installation of the device. The experimental results show that when the relative flow rate is greater than 45%, the total pressure of the fan increases significantly and the high efficiency area broadens when the relative flow rate is greater than 45%. The fan noise decreases when the relative flow rate is less than 100%, and at the maximum efficiency point, Medium and low band noise is significantly reduced. The design of the vortex crusher has some guiding significance for energy-saving and noise reduction of the power plant and the solution to the problem of insufficient wind pressure.