摘要
为促进可燃制冷剂的安全应用,选择R717、R290、R32和R1234yf为研究对象,对制冷剂水平泄漏到有限空间后的扩散和分布特性进行研究,分析制冷剂热物性参数对质量分数分布的影响,探究制冷剂在不同泄漏量下房间内的可燃区域变化。结果表明:泄漏过程中制冷剂主要聚集在泄漏孔附近沿射流方向的局部区域内,房间其他位置制冷剂质量分数较低;沿射流方向,距离泄漏孔较近位置,密度较大的制冷剂质量分数较高,距离泄漏孔远的位置,密度较小的制冷剂质量分数较高;在制冷剂密度接近时,黏度较大的制冷剂在泄漏孔周围堆积现象更加显著,制冷剂质量分数较高;在扩散过程中,密度较大的制冷剂在水平泄漏发生后会在重力作用下向地面附近扩散,在泄漏孔上方处制冷剂的质量分数非常低,密度小的制冷剂在水平泄漏后会撞击墙壁然后向空间上部和底部扩散,制冷剂在整个空间中的质量分数分布较为均匀;密度接近时,黏度更大的制冷剂更难扩散到房间其他低质量分数区域,制冷剂质量分数分布更加不均匀。
In order to promote the safe application of flammable refrigerants,R717,R290,R32 and R1234yf are selected as the research objects,the diffusion and distribution characteristics of refrigerant after horizontal leakage into the confined space are studied,the influence of refrigerant thermophysical parameters on the mass fraction distribution is analyzed,and the change of the flammable area in the room under different refrigerant leakage rates is explored.The results show that the refrigerant mainly gathers in the local area near the leakage hole along the jet direction during the leakage process,and the mass fractions of the refrigerant at other positions of the room are lower.The mass fraction of refrigerant with a greater density is higher at the location close to the leakage hole along the jet direction, and the mass fraction of the refrigerant with smaller density is higher atthe location far away from the leakage hole. When the refrigerant density is approximate,the accumulation phenomenon of the refrigerant with the higher viscosity is more significant around the leakage hole, and the refrigerant mass fraction in the area is higher. During the diffusion process, the refrigerant with greater density diffuses to the ground underthe action of gravity after horizontal leakage, and the mass fraction of the refrigerant inthe area above the leakage hole is very low. The refrigerant with smaller density hits thewall after horizontal leakage, and then the refrigerant diffuses to the upper and bottom ofthe space, and the mass fraction distribution of the refrigerant in the whole space is relativelyuniform. When the refrigerant density is approximate, the refrigerant with higherviscous is more difficult to diffuse to other low mass fraction areas of the room, and themass fraction distribution of the refrigerant is more uneven.
作者
李亚伦
周培旭
叶恭然
严昱昊
欧阳洪生
韩晓红
Li Yalun;Zhou Peixu;Ye Gongran;Yan Yuhao;Ouyang Hongsheng;Han Xiaohong(Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province,Institute of Refrigeration and Cryogenics,Zhejiang University;State Key Laboratory for Fluorinated Greenhouse Gases Replacement and Control Treatment,Zhejiang Research Institute of Chemical Industry Co..Ltd.)
出处
《制冷与空调》
2025年第5期26-36,共11页
Refrigeration and Air-Conditioning
基金
国家自然科学基金项目(51936007,52076185)。
关键词
制冷剂
可燃
水平泄漏
扩散和分布
热物性
refrigerants
flammable
horizontal leakage
diffusion and distribution
thermophysical parameters
