The flammability of refrigerants is a major cause of refrigerant explosion incidents. Studying the explosion characteristics of refrigerants at different initial temperatures can provide significant benefits for solving the safety problems of refrigerants under actual working conditions. This paper studied the effects of the initial temperature and refrigerant concentration on the explosion characteristics of refrigerant 2, 3, 3, 3-tetrafluoropropene (R1234yf) at 0.1 MPa. The curves of explosion characteristics with different initial temperature revealed the same variation trend ranged from 25 °C to 115 °C. Specifically, as the refrigerant concentration was raised, the peak overpressure, the maximum rate of pressure rise, and laminar burning velocity increased initially and decreased afterwards, along with maximum values at the refrigerant concentration of 7.6%. When the refrigerant concentration was 7.6%, the peak overpressure declined exponentially with the initial temperature rise, while the maximum rate of pressure rise increased linearly. The laminar burning velocity calculated from the spherical expansion method indicated that the flame propagation was gradually accelerated by the increase of initial temperature, which coincided with the change of the maximum rate of pressure rise. Meanwhile, experiments and CHEMKIN simulation results demonstrated the effects of elevated temperature from 20 °C to 50 °C on the explosion limits of R1234yf. The lower explosion limit reduced and the upper explosion limit increased with rising initial temperature. In general, R1234yf exhibited moderate combustion and lower explosion risk, compared with traditional refrigerants.

制冷剂的可燃性是制冷剂爆炸事件的主要原因。研究制冷剂在不同初始温度下的爆炸特性可以为解决制冷剂在实际工作条件下的安全问题提供重要的益处。本文研究了初始温度和制冷剂浓度对0.1 MPa下制冷剂2、3、3、3-四氟丙烯（R1234yf）爆炸特性的影响。不同初始温度下的爆炸特性曲线显示出相同的变化趋势，范围从25°C到115°C。具体而言，随着制冷剂浓度的升高，峰值过压，最大压力上升率和层流燃烧速度先增加后减少。以及在制冷剂浓度为7.6％时的最大值。当制冷剂浓度为7.6％时，峰值超压随初始温度升高呈指数下降，而最大升压速率呈线性增加。通过球面膨胀法计算的层流燃烧速度表明，随着初始温度的升高，火焰的传播逐渐加速，这与最大压力上升率的变化相吻合。同时，实验和CHEMKIN模拟结果证明了温度从20°C升至50°C对R1234yf爆炸极限的影响。随着初始温度的升高，爆炸下限减小，爆炸上限增大。通常，R1234yf具有中等燃烧性，爆炸风险较低，