多翼离心风机叶轮的正交设计与试验分析

Orthogonal Design and Experiment Analysis of Multi-blades Centrifugal Fan Impeller

风机叶轮是吸油烟机的核心部件,每次吸油烟机的更新换代都离不开多翼风机叶轮结构改型,因而对叶轮结构参数的优化对吸油烟机的风量、风压等性能指标的改善提升有着重要意义。本文利用CFD方法结合正交表对吸油烟机用多翼叶离心风机叶轮的关键参数进行优化,计算了多个工况点的值,并且将仿真结果与试验结果进行了对比,验证了模型的可靠性,为后续方案改进评估提供依据,随后以全压为优化目标,选定叶轮4个关键参数,并利用正交法生成了叶轮参数组合,通过仿真计算及对结果的极差法分析,得出了相对最优组合,绘制了P-Q曲线,并且加工了优化前后的实物叶轮,进行了风量风压测试,测试结果与仿真结果趋势一致,整体性能数据比较吻合,达到了既定的优化目标,同时验证了仿真结果的可靠性。本研究方法可快速准确获得最优方案,对类似产品的设计具有借鉴意义。

Most range hoods use multi-blades centrifugal fan as power conversion device. The update of range hood is inseparable from the multi-blades centrifugal impeller structure modification. The optimization of structural parameters in the impeller design is significant to the air volume and air pressure, which plays an important role in the range hood performance. This paper tries to use the orthogonal table combined with the numerical simulation technology to optimize the picked main influence parameters of the impeller. Firstly,the author compared the result of CFD with the result of experiment in several working conditions, which makes the model and subsequent working convincing. Then, the author chose the total pressure as the main goal parameter and picked four main structural parameter of the impeller as input. With the orthogonal method,we got several groups of the impeller parameter as the numerical simulation input and got the total pressure as the output. By means of range method analysis of the results from the numerical simulation,we gained the relatively optimal solution and the corresponding P-Q curve,which produced the maximum total pressure. Through the comparison between the original and the designed impeller, the results of both CFD and the experiment proved to be expected. That verified the numerical simulation to be accurate and made the set goal achieved. This paper propose to high-efficient way to do the multi-parameter optimization and could be applied in the analogous research.