室内空气质量的好坏与人类健康密切相关。新建筑、装潢材料的推广和更多家用化学药剂的使用，造成室内空气严重污染，而甲醛是室内空气污染危害最严重且最常见的是污染物之一。有效的通风和合理的气流组织可以控制室内甲醛浓度而使其很容易地符合设计要求。 本文采用Fluent软件来模拟三维的家用空调室内气流组织的流动形式，研究了入口风速、进风口至顶棚的距离及进回风口相对位置对空调室内气流分布的影响及甲醛浓度的分布影响，并在Fluent软件中以直观的方式表示出了各种不同气流组织方案下气流的温度场、速度场(气流流型图)和甲醛浓度分布场。得出送风速度不能太大也不能太小，以2m/s～3m/s为最佳；归纳出最有效的送风高度约为房间高度的15%～20%；置换通风能更有效的除去室内的甲醛，降低室内甲醛浓度。结果表明具体采用哪种组合方式要以具体情况而定，以能够产生均匀、没有死角的气流组织形式为宜。

With the rapid development of the technological and economic, modern living environment paid more and more attention. The quality of indoor air quality contacts with human health closely. New construction, decoration materials, promotion, and more use of household chemicals, resulting in serious indoor air pollution, formaldehyde is the most serious hazards of indoor air pollution and one of the most common pollutionts. Effective ventilation and a reasonable indoor air formaldehyde concentration organizations can easily meet the design requirements. This paper an application of Fluent in the turbulent flow of three-dimensional air-conditioned room. Adopt different entry velocities, the distance from entry to the top of room, the opposite locations of entries and exits to simulate the airflow in the room. The results of numerical simulation for many different kinds of airflow are expressed in streamline chart of airflow structure through Fluent software. Can not draw too much air speed, can not be too small, 2m/s-3m/s best: summarize the most effective height for the room air 15% -20% high; displacement ventilation can be more effectively remove indoor formaldehyde. The results show that specific combinations should be adopted to the specific circumstances in order to be able to produce uniform, did not form suitable for air dead.