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

通信作者简介：

程贵海（1963—），男，硕士，副教授，硕士生导师，研究方向为工程爆破。E-mail：253355676@qq.com。

徐中慧（1983—），男，博士，副教授，硕士生导师，研究方向为环境安全。E-mail：xuzhonghui@swust.edu.cn。