空气幕对厨房内PM2.5控制效果的模拟与分析

厨房烹饪是民居室内PM_2.5污染物的重要来源，为对其进行有效控制，提出了空气幕送风方式。建立厨房物理模型，使用Fluent软件对厨房内的气流组织、温度分布和PM_2.5浓度分布进行了数值模拟。研究了空气幕对厨房内PM_2.5和热流的控制效果，并对3种射流速度进行对比分析。研究结果表明：空气幕射流气流对烹饪区域产生了很好的包裹效应，可以阻隔PM_2.5的扩散和热流的蔓延；可使厨房内PM_2.5排除率提高到44%~75%，平均降温1~2℃。当空气幕射流速度为0.6 m/s时，控制效果最佳。研究结论可对厨房PM_2.5污染的防治提供参考，为空气幕送风系统的研究提供模拟数据和理论依据。

A Numerical Simulation and an Analysis of Air Curtain Control Effect on PM2.5 in the Kitchen

Cooking in the residential kitchen is an important source of indoor PM_2.5. In order to control PM_2.5 effectively, the air curtain is proposed as an air supply means. A model of the kitchen is built and a numerical simulation, including airflow organization, temperature distribution and PM_2.5 concentration distribution in the kitchen, is performed by using the Fluent software. A numerical simulation is performed to study the control effect of PM_2.5 pollutants and heat flow in the kitchen. Three kinds of jet velocities are compared and analyzed. The results of this study show that the jet flow of an air curtain has a good wrapping effect on the cooking area, which can obstruct the diffusion of PM_2.5 and the spread of heat flow. The PM_2.5 removal rate can be increased to 44%~75%, and the average temperature in the kitchen can be lowered by 1~2 ℃ by using the air curtain to supply air. The control effect is optimal when the air curtain jet velocity is 0.6 m/s. The research productions have reference for the prevention and treatment of PM_2.5 pollution in the kitchen and can provide simulation data and a theoretical basis for the study of the air curtain air supply system.