R1234yf在电动汽车热泵系统中泄漏燃烧特性的实验研究

Experimental Study on Leakage Combustion Characteristics of R1234yf in Electric Vehicle Heat Pump System

本文通过模拟电动汽车热泵系统中的泄漏燃烧对R1234yf的燃烧特性进行研究,得到了不同泄漏温度和体积流量下R1234yf的泄漏和燃烧特性。结果表明:制冷剂的温度为60℃时其燃烧火焰最高,在低温下不易点燃;在体积流量由0.5 L/min增大到2.0 L/min时,R1234yf的燃烧火焰长度显著增加,但是体积流量达到2.0 L/min以上,制冷剂温度为30℃和60℃时,其燃烧火焰保持稳定,当温度达到90℃时,火焰长度明显减小;此外利用辐射采集器对燃烧火焰的辐射进行采集,当体积流量小于1.25 L/min时,辐射采集器1处的热辐射值随着体积流量的增加而增大,当体积流量大于1.25 L/min时,该处的热辐射值随着体积流量的增加而减小;而在所有实验条件下,由热辐射采集器2收集的热辐射都随着制冷剂气体体积流量的增大而减小,且该处热辐射通量远大于热辐射采集器1处的热辐射通量。

The combustion characteristics of R1234 yf is studied by simulating the leakage combustion in the heat pump system of electric vehicles in this paper, and the leakage and combustion characteristics of R1234 yf under different leakage temperatures and volume flows are obtained. The results show that the flame is highest when the temperature of the refrigerant is 60 ℃, but it is not easy to ignite at low temperature;when the volume flow rate is increased from 0.5 L/min to 2.0 L/min, the flame length of R1234 yf increases significantly. However, when the volume flow rate reaches 2.0 L/min or more and the refrigerant temperature is 30 ℃ and 60 ℃, the flame remains stable. When the temperature reaches 90 ℃, the flame length is significantly reduced;in addition, the radiation collector is used to collect the heat radiation. When the volume flow is less than 1.25 L/min, the heat radiation at the radiation collector 1 increases with the increase of the volume flow. When the volume flow is greater than 1.25 L/min, the heat radiation at this place decreases with the increase of volume flow rate;under all experimental conditions, the heat radiation collected by the heat radiation collector 2 decreases with the increase of the refrigerant volume flow, and the heat radiation at this place is much larger than that at the heat radiation collector 1.