NUMERICAL SIMULATION AND EXPERIMENTAL STUDY OF LEAKAGE AND COMBUSTION OF FLAMMABLE REFRIGERANT ALTERNATIVES

摘要

Freon have been prohibited for a long time due to the problems of their destruct effect on ozonosphere and causing the environment climate warm, so more and more people have turned their eyes to concentrate on the green nature refrigerants. The combustibility is the main shortcoming of nature alternative refrigerants, although they have conquered the disadvantages of Freon. In order to research the rule of combustibility, the indoor combustion of leaked flammable refrigerant gas was studied through numerical simulation and experiments for security of refrigerant alternatives. It is concluded that the trend of the experimental results could agree with the trend of the simulated results and the numerical simulation could seek the laws of fire of fuel gas, according to the contrast of pictures from calculations and experiments. At the beginning of the igniting, the flame spreads fast in the flammable zone. After combustion, the upper part of the box is high dangerous field of high temperature and oxygen deficient; and the lower part of the box near the window is lower temperature, but this field is relatively safe for the moment, because oxygen from outside is easily mixed with sedimentary refrigerant gas in this region and forms flammable mixture.