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以一体化布置的中高压自然循环反应堆模拟实验装置为基础,从实验和理论分析两方面研究了上升段和下降段之间的传热以及堆芯和主换热器内温度变化对稳态自然循环能力造成的影响.实际测得了上升段进出口温差和套管式换热器一次侧水温在轴向的非线性分布,并推导得到了上升段与下降段之间的传热以及热源和热阱中温度分布对自然循环能力影响的表达式.研究表明,当上升段和下降段之问传热造成温度变化1～20℃,热源和热阱均为抛物线温度分布时,自然循环能力减小约0.2％～4％.“,”Based on the experimental phenomena,the effect of temperature distribution on natural circulation capacity is analyzed theoretically,and the expressions about the influence function of distribution are obtained.It is indicated that the heat transfer between upward section and downward section and the parabola temperature distribution in the heat source and heat sink have certain but not heavy influence on the natural circulation capacity in the natural circulation loop.The deviation of natural circulation caused by these two reasons is a function of geometric structure of natural circulation system,temperature increase in the upward section,the thermal expansion coefficient and the type of the.parabola temperature distribution,and the effects of different reasons are separated.When the temperature increases or decreases in the upward section or downward section △T＜1～20 ℃,the deviation of natural circulation capacity is limited in ε％＜0.2％～4％.