平板形障碍物对气云爆炸强度影响的实验研究

以乙炔 -空气为介质实验研究了平板形障碍物对可燃气云爆燃强度的影响 ,运用曲线拟合方法获得了弱点火条件下气云爆燃时平板形障碍物上的压力分布与气云初始半径、平板离开爆源中心的距离之间的关系式 ,为气云爆炸的缩放研究提供了基础 .讨论了平板形障碍物对气云爆燃强度的影响 .

EXPERIMENTAL RESEARCH ON EFFECT OF PLATES ON EXPLOSION PRESSURES OF FLAMMABLE GAS CLOUDS

An experimental system was designed and constructed to study the effect of plates on flammable gas cloud explosion pressures.The semi-sph erical gas clouds were formed by 0.02?mm polyethylene films.In the spheri cal center was an ignition electrode that met ISO6184 "Explosion Protection System" and NFPA68 "Guide For Venting of Deflagrations".A data-acquisition syste m,with dynamic responding time less than 0.001s,recorded the explosion pressure-time diagran of acetylene-air mixture with stoichiometrical ratio.The initial cloud radii were 50cm and 100cm.The wood plates did not bend under t he explosion pressures.The distances of plates to the centers of gas clouds were 100,150,200,213.5 and 300?cm,respectively.By fitting the experimenta l data,the relationship between the maximum pressures on the plates and the initial radii of gas clouds,the distances to the centers of gas clouds,the incident angles and the coordinate values on plates are obtained.The equation fitting is effective under 99% confidence based on the mean square deviation analysis.