基于CFD和响应面的离心风机蜗壳的优化

Optimization of Centrifugal Fan for volute by CFD and Response Sureface Methodology

离心风机作为清扫车气力系统的核心部件,对清扫效果、作业效率和噪声等车辆属性有着至关重要的作用。离心风机主要由蜗壳和叶轮构成,蜗壳主要对经过叶轮的气体进行扩压,蜗壳扩压能力的强弱直接影响风机全压的大小,进而影响清扫车气力系统的吸力等作业参数。为了研究不同蜗壳尺寸对某清扫车专用风机气动性能的影响,首先对风机蜗壳域的尺寸进行参数化处理,采用fluent流体分析软件结合DOE、响应面优化分析,以workbench为平台对离心风机整机进行数值计算,自动优化设计参数使风机气动性能在工作区域内达到最佳。结果表明,优化后风机静压提高7.3%,效率提高4.6%,叶轮流道内速度分布更加均匀,涡流区明显减少。

As the core component of the sweepers,the centrifugal fan has played a crucial and decisive impact on the sweeper's working effect,efficiency,noise,recycle rate of wastewater and other vehicle properties.The centrifugal fan is mainly composed of volute and impeller.The volute diffuses the gas passing through the impeller.The diffuser capacity of the volute directly affects the total pressure of the fan,and then affects the suction and other operating parameters of the pneumatic system of the sweeper.In order to study the influence of different volute sizes on the aerodynamic performance of the fan of a sweeper,the sizes of the volute domain are firstly parameterized.Using fluent software combined with DOE and response surface optimization analysis,the centrifugal fan is numerically calculated in workbench to automatically optimize the aerodynamic performance of the fan in the working area.The results show that the static pressure of the fan is improved by 7.3%and the efficiency is improved by 4.6%after optimization.The velocity distribution in the impeller passage is more uniform and the vortex area is significantly reduced.