离心风机蜗壳内加装旋涡破碎装置的实验研究

基于k-e 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。

Experimental Investigation on Volute of Centrifugal Fan With a Vortex-broken Device

The characteristics of three-dimension flow field of the G4-73 centrifugal fan were numerically simulated based on k-e turbulence model with Fluent. The numerical results show that large-scale spiral swirl in volute were push forward. A vortex-broken device was designed, and experiments were done before and after the installation of the device. Experimental results show that after the device was added, when relative flow more than 45%, total pressure increased significantly and efficiency area to broaden. When relative flow under 100%, fan noise reduction, mid-frequency and low-frequency noise significantly decreased at the maximum efficiency point. The design of the vortex-broken device has a guiding significance of energy-saving and noise reduction for power plant.