摘要：使用哈特曼管, 对5种粒径的钛粉进行最小点火能 (E_min) 实验;选取喷尘压力 (p) 、紊流指数 (t_v) 处于敏感值的数据拟合出钛粉点火能量 (E_i) 受质量浓度和粒径影响变化的函数, 以及敏感质量浓度受粒径影响变化的函数。结果表明:中位粒径为18、25、38、48、74μm的钛粉对应的敏感质量浓度分别为700、750、800、800、850 g/m3, 最小点火能分别为33.2、38.1、41.3、44.3、67.4 m J;点火能量随质量浓度的增大以二次函数的形式先减后增, 随粒径的增大以二次函数的形式增大;敏感质量浓度与钛粉粒径呈正相关;紊流指数敏感值与喷尘压力呈负相关;喷尘压力不变, 粒径越大, 紊流指数敏感值越大;紊流指数不变, 钛粉粒径越大, 喷尘压力敏感值越大。

关键词：钛粉；最小点火能；粒径；质量浓度；喷尘压力；紊流指数

Abstract：The Hartmann tube was used in experiment with the spherical titanium powder of five different particle sizes. The data of dispersion pressure (p) , turbulent flow index (t_v) in the sensitive value were selected to fit out the function between the ignition energy (E_i) and concentration, particle size, and the function between the sensitive concentration and the particle size.The results show that the sensitive concentration of the titanium powder corresponding to the average size of 18, 25, 38, 48, 74μm are respectively 700, 750, 800, 800 and 850 g/m3, the minimum ignition energy were 33.2, 38.1, 41.3, 44.3 and 67.4 m J respectively. The ignition energy decrease first and then increase with the increase of concentration in the form of quadratic function, and increase with the increase of the particle size in the form of quadratic function. The sensitive concentration is positively related to the particle size of titanium powder, and the sensitivity of turbulent flow index is negatively related to the dispersion pressure. When the dispersion pressure is constant, the larger the particle size, the greater the sensitivity of the turbulent flow index. When the turbulent flow index is constant, the larger the particle size of titanium powder, the greater the sensitive value of the dispersion pressure.

Keywords:  titanium powder；minimum ignition energy；particle size；concentration；dispersion pressure；turbulence flow index