To investigate the influences of aluminum size and content on the performance of aluminized explosives in confined space,experiments were conducted in a fully confined chamber.Two kinds of RDX based explosives with different aluminum oxygen ratio(0.45 and 0.99) containing aluminum of 50 nm,5 μm and 50 μm respectively were used.The data processing method of multipoints averaging for gaining quasic-static pressure and exponential decay similar for gaining the attenuation factor of pressure were proposed.Three characteristic quantities,quasic-static pressure (pQS),rising time of pressure (tQS) and attenuation factor of pressure (ω),were used to characterize the energy release from aluminized explosives in chamber.Results show that for the formulation with aluminum oxygen ratio of 0.45,the pQS of sample with 50 μm aluminum powder is 0.3％ and 0.7％ higher than those with 5 μm and 50 nm aluminum,respectively.For the formulation with aluminum oxygen ratio of 0.99,the pQS of sample containing 50 μm aluminum powder was 31.2％ and 31.9％ higher than those containing 5 μm and 50 nm aluminum powder,respectively,and the pQS of two samples with aluminum oxygen ratio of 0.45 containing the same particle size aluminum powder are larger than the sample with aluminum oxygen ratio of 0.45.With respect to either samples containing the same size of aluminum,with the increase of aluminum oxygen ratio,pQS increased,tQS and ω decreased.%为研究铝粉粒度和铝氧比对含铝炸药在密闭空间内爆炸能量输出的影响,对铝氧比为0.45和0.99,铝粉粒度分别为50 nm、5μm和50 μm的RDX基含铝炸药进行了内爆炸实验.采用多点平均降噪法对压力曲线进行降噪处理获得准静态压力,指数衰减近似法获得压力衰减系数的实验数据处理方法,提出用准静态压力(pQS)、压力上升时间(tQS)和压力衰减系数(ω)三个特征量来表征含铝炸药在密闭空间内爆炸的能量输出特性.实验研究结果表明:铝氧比为0.45,含50μm铝粉的pQS比含5μm和含50 nm的分别高0.3％和0.7％;相应的tQS分别延长8.6 ms和10.0 ms.铝氧比为0.99,含50 μm铝粉的pQS比含5μm和含50 nm铝粉的分别高31.2％和31.9％,相应的tQs分别延长9.3 ms和9.4 ms.铝粉粒度相同时,铝氧比为0.99的pQS大于铝氧比0.45的pQS,tQS亦是如此.对于任一铝氧比炸药,ω随铝粉粒度的增加而减少,对于同一铝粉粒度,ω随铝氧比增加而减少.
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