本文对卧式螺旋管内R134a过冷流动沸腾的起始点进行实验研究,根据壁面温度的变化规律判定过冷沸腾起始点。在热流密度逐渐增大的情况下,对过冷沸腾发生时相关参数的不同变化进行了研究,得到了过冷沸腾起始点上壁面过热度和热流密度随位置的变化规律。分析了入口参数对过冷沸腾起始点的热流密度的影响趋势。对实验数据进行回归分析,发展了适用于卧式螺旋管内过冷沸腾起始点热流密度的经验关联式。 In this paper, the starting point of R134a subcooled flow boiling in a horizontal spiral tube was experimentally studied, and the onset of subcooling boiling was judged according to the variation of wall temperature. Under the condition of increasing heat flux density, different changes of relevant parameters during subcooling boiling were studied, and the variation of superheat and heat flux at the starting point of subcooled boiling with the position were obtained. The effect of inlet parameters on the heat flux density at the onset of subcooled boiling is analyzed. Regression analysis of the experimental data, developed empirical correlation applicable to the heat flux density of the subcooled boiling point in the horizontal spiral pipe.