基于数值仿真的吸油烟机前端多流域建模及流场优化研究

Multi-domain modeling of the front-end of range hood based on numerical simulation and research on flow field optimization

目前吸烟效果是用户在吸油烟机实际使用时需要进一步优化的技术方向,前端多流域的设计对整机的吸烟效果有着重要影响。计算流体力学在吸油烟机技术方向研究中起到极其重要的作用,用于其风机系统(蜗壳、叶轮、电机)、风道、前端流道等多模块的设计和优化。吸油烟机在现有厨房使用环境中,容易受到横风或者周围其他复杂环境影响,导致吸烟效果变差,使部分烟气扩散至厨房内,使厨房内异味严重,油烟量大,增加厨房的清洁难度。通过数值仿真对比分析与实验验证的方法设计了一种异型双进气口,可以扩大负压区的覆盖范围,降低锅具烟气正上方的负压值,提升吸油烟机对锅具产生的烟气的拢吸能力,烟气流动泄漏更少,同时由于前端气流流动方式的改变,整机的半消声室噪声水平降低约0.6 dB(A)。

Currently,the smoking effect is a technical direction that needs further optimization when users use the range hood in practice,and the design of a multi-flow field on the front end has an important impact on the smoke absorption effect of the entire machine.Computational fluid dynamics have far-reaching consequences on the research of the technical direction of range hood,used for the design and optimization of its fan system(scroll casing,impeller,motor),air ducts,and front-end flow channels.Range hoods are easily aff ected by crosswinds or other complex environments in existing kitchen environments,which can lead to a decrease in smoke absorption effectiveness,causing some smoke to escape into the kitchen and increasing the difficulty of cleaning the kitchen due to strong odors and smoke.Uses numerical simulation,comparative analysis,and experimental verification to design a special-shaped double air inlet that can expand the coverage of the negative pressure zone,reduce the negative pressure value directly above the pot smoke,improve the range hood's ability to capture smoke produced by the pot,and reduce smoke flow leakage.At the same time,due to changes in the flow of air at the front end,the noise level of the entire machine's semi-anechoic chamber is reduced by approximately 0.6 dB(A).