基于响应面法的风机过滤单元(FFU)离心叶轮优化设计

Optimization Design of Centrifugal Impeller of Fan Filter Unit(FFU)Based on Response Surface Method

风机过滤单元(FFU)因负压密封、出风均匀、布置灵活和控制系统可靠等优点而成为洁净室末端使用最广泛的洁净装备,针对FFU运行效率高和能耗低的要求,对离心叶轮提出优化设计。首先对风机过滤单元(FFU)进行性能测试,得到FFU在不同转速情况下,体积风量随余压变化曲线。然后对FFU进行了CFD数值模拟,并将FFU模拟结果与测试结果进行对比,验证有限元模拟的可靠性。基于响应面实验设计方法,建立了以叶片数z、叶轮内径D1,叶片安装出口角β2a、叶片安装入口角β1a及叶片出口宽度b2为输入变量,以体积风量Q为响应变量的二次多项式拟合函数。以体积风量Q为优化目标,采用多岛遗传算法求解响应函数,得到离心叶轮结构的最优组合参数。结果表明:离心叶轮结构参数对FFU体积风量从大到小的影响顺序为:β2a>β2>z>β1a>D1;得到离心叶轮最优组合参数,优化后的离心叶轮结构参数使得FFU体积风量提高了11.4%。

First,the performance of the fan filter unit(FFU)was tested and the curve that the air volume of FFU changed with residual pressure at different rotate speeds was obtained.Then CFD numerical simulation was done for FFU,and FFU simulation results were compared with test results to verify the reliability of finite element simulation.Based on response surface experiment design method,the quadratic polynomial fitting function which took number of blades z,inner diameter of impeller D1,blade installation outlet angle β2a,blade installation inlet angleb1a and blade outlet width β2 as input variables and took air volume Q as response variable was established.By taking air volume Q as optimization objective,multi-island genetic algorithm was used to solve the response function and get the optimal combined parameters of centrifugal impeller structure.The results showed that the influence of centrifugal impeller structure parameters on air volume of FFU was as follows:β2a>β2>z>β1a>D1;the optimal combination parameters of centrifugal impeller are obtained,and it increased the air volume of FFU by 11.4%.