摘要：利用20 L球型密闭爆炸装置, 对5种不同粒径的球形钛粉进行爆炸实验;选取喷尘压力p、紊流指数tv均处于敏感值的数据, 分别拟合出最大爆炸压力P_max、最大爆炸指数K_max随钛粉粒径和浓度变化的函数, 以及两者的敏感质量浓度、爆炸下限质量浓度ρ_lim随粒径变化的函数。结果表明:最大爆炸指数的敏感质量浓度和敏感紊流指数大于等于最大爆炸压力的敏感质量浓度和敏感紊流指数;随着粒径增加, 最大爆炸压力以二次函数的形式减小, 而最大爆炸指数以指数函数的形式减小, 两者对应的敏感质量浓度、爆炸下限浓度以线性函数的形式增加;随着钛粉浓度的增加, 最大爆炸压力和最大爆炸指数以二次函数的形式先增大后减小。

关键词：钛粉；猛度参数；粒径；喷尘压力；紊流指数

Abstract：The 20 L spherical vessel was used in explosion experiment of spherical titanium powder of five different particle sizes. The research selected the sensitive value data of spray pressure p and turbulent flow index t_v, and then fitted the function of tendency of maximum explosion pressure p_max and maximum explosion index K_max influenced by titanium particle size and concentration, and then fitted the function of tendency of the sensitivity concentration of P_max and K_max and lower explosive limitρ_lim influenced by titanium particle size. The results show that the sensitivity concentration and sensitivity turbulence index of K_max are equal or higher than those of P_max. As particle size increases, P_max decreases in the form of quadratic function, while P_max decrease in the form of exponential function, and the sensitivity concentration and LEL of P_max and K_max increase in the form of linear function. As the concentration of titanium powder increase, P_max and K_max increase at first, and then decrease in the form of quadratic function

Keywords：titanium powder；explosive intensity parameters；particle size；spray pressure； turbulence index