人工环境试验室气流组织模拟与分析

Simulation and Analysis of Air Flow Organization in Artificial Environment Laboratory

人工环境试验室是以空气焓差法为基础来检测各类制冷设备性能的实验装置,本文以某单位现有人工环境实验室为研究对象,采用数值模拟软件对实验室送风结构进行模拟计算,分析探讨了风道送风和孔板送风两种不同送风方式,对房间内气流组织的影响,由模拟结果可知,孔板送风相对于风道送风而言,其温度场更加均匀,其房间内温差可控制在±0.3 K,达到高精度焓差实验室的要求,但孔板送风仅适用于侧出风的被测机,对于顶出风的被测机,会在房间内出现对流扰动,导致其温度场分布不满足测试要求,因而孔板送风方式适用性较差,风道送风方式既适用于侧出风被测机也适用于顶出风被测机,虽其房间内流场分布会出现不均匀的情况,但其温度场温差可控制在±0.5 K,满足国标要求。

The artificial environment laboratory is an experimental device based on air differential method to detect the performance of various kinds of refrigeration equipment, and this paper takes the exist-ing artificial environment laboratory of a unit as the research object, uses numerical simulation software to simulate the structure of the laboratory air supply, and analyzes and discusses the air supply of the duct and two different air supply modes, that is, the air supply and orifice plates and their influence on the air distribution in the room. According to the simulation results, under the condition of the orifice plate air supply, its temperature field of the room is more even and the temperature difference can be controlled in ±0.3 K, which can meet the needs of high precision en-thalpy difference laboratory, compared with that of the air duct air supply. However, the orifice air supply only applies to the test machine with side air outlet. For the test machine with air ejection, there will be convection disturbance in the room, resulting in the poorer temperature field distri-bution to meet the test requirements. Therefore, the orifice air supply mode has poor applicability, while the air duct air supply mode is suitable for both the side air outlet test machine and the top air outlet test machine. Although the flow field distribution in the room may be uneven, the tem-perature difference of the field can be controlled within ±0.5 K, meeting the requirements of the national standard.