A new spherical model with cones on the sodium droplet surface was applied to replace the traditional and spherical model in the spray fire calculation of sodium cooled fast reactor ,w hich could improve the accuracy of simulation based on the actual combustion phenomena .Based on the different mechanisms of the surface oxidation , pre-combustion and combustion stages ,the mathematical models were established and combustion temperature characteristics were simulated under different initial tempera-tures (200-500 ℃) of sodium droplet and oxygen fractions (4%-20% ) by introducing the proportion factor γof the mass participating in the oxidation reaction to vaporization in the unit time .The simulation results are well consistent with the experiment data , and the variation rule of γvalues was analyzed .%对钠冷快堆喷雾钠火计算中使用的传统球状钠滴模型进行了改进，采用表面带有锥状突起的钠滴新模型，使模拟更接近于燃烧实际现象。根据钠滴燃烧过程中表面氧化、预燃和燃烧3个阶段的不同规律，分别建立了数学模型，通过引入单位时间内参与氧化反应与发生气化的钠的质量比γ，模拟计算了钠滴在不同初始温度（200～500℃）和不同氧气浓度（4％～20％）下的燃烧温度特性。仿真结果与实验数据吻合较好，并分析了γ的变化规律。
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