吸油烟机内风道系统性能优化研究

Investigation of Aerodynamic Performance Optimization in Range Hood Air Duct System

吸油烟机内风道系统结构对吸油烟机气动性能有着十分重要的影响。本文首先采用计算流体力学软件FLUENT对吸油烟机气动性能进行数值模拟,将数值与实验测量结果进行对比,验证了数值计算模型和计算方法的有效性。然后针对吸油烟机箱体进风宽度比ε、蜗壳宽度B和蜗壳出口扩张率β,采用响应面法对吸油烟机性能进行优化。基于优化前后吸油烟机内部流动特性的CFD结果分析,揭示了吸油烟机箱体结构参数对其气动性能的影响,并对优化的吸油烟机风道系统的气动性能和噪声进行了实验测量。结果表明,通过参数优化,吸油烟机内流动状态得到改善,流动损失减小。优化的吸油烟机的全压在整个工况范围内都得到了不同程度的提升。当噪声基本保持不变时,吸油烟机最大风量增加了0.95 m^3/min。

The structure design and its optimization of the air duct system in the range hood have a very important influence on the aerodynamic performance of the range hood. In this paper, a commercial CFD software FLUENT is used to simulate several operating conditions of the range hood. The reliability of the numerical simulation results is verified by comparing with the experimental results. And then, the response surface methodology is conducted to improve the aerodynamic performance of the range hood by optimizing the air inlet width ratio ε, the volute width B and the volute export expansion rate β. Based on the CFD results, the effects of the air passage system structure on aerodynamic performance of the range hood is revealed. The aerodynamic performance and corresponding noise of the original and optimized range hood are also tested. The studied results show that the flow regime in the range hood is improved and the flow loss is reduced through the optimization of the structural parameters. The total pressure of the range hood in the all operating conditions is improved. When the aerodynamic noise remaines basically unchanged, the maximum flow rate of the range hood increases by 0.95 m3/min.