球型密闭容器中铝粉爆炸机理的研究

对中心点火球型密闭容器中的铝粉爆炸进行了实验和理论两方面的研究。实验采用２０立升的球。除测量压力外，还通过系踪平均法测试了流场的湍流强度，并利用电子显微镜和Ｘ光衍射仪分析了铝粉及其燃烧后残渣的形状和组分。文中对２０立升和５０立升球型容器中铝粉燃烧的全过程进行了数值模拟。对于可测量的量如压力和压力上升速率，计算结果与实验结果基本相符。基于反应区外质点的熵几乎不变这一事实，对计算获得的参数剖面还进行了理论分析。

THE INVESTIGATION OF ALUMINUM DUST EXPLOSION IN A SPHERICAL CLOSED VESSEL

An aluminum dust explosion in a spherical closed vessel with central ignition hasbeen investigated both both experimentally and theoretically.Experiments were conducted in a standard 20-liter vessel. Except measurements of pressure ,the turbulence parameters were determined by using an ensemble average technique and a scan-ning eleetron microscope and a X-ray spectrograph were used to analyse aluminum particles andits combustion residues.The numerical simulation has been performed for 20-liter and 50-liter spherical vessels. It isshown from calcutated results that entropy of an element of mixture outside reaction zone keepsalmost constant, then the feature of parameter profiles can be discussed theoretically. Computedresults of pressure and pressure rise rate in a vessel are in agreement with experiment results.