FAE装置参数对燃料抛撒与爆炸威力影响的实验研究

 采用高速运动分析系统对FAE实验装置爆炸抛撒过程进行观测,描述了燃料抛撒过程的不同阶段,实验研究了比药量、长径比、壳体材质等装置参数对燃料抛撒与爆炸威力的影响。结果表明,燃料抛撒过程可分为射流形成与扩散运动阶段、燃料两向膨胀运动阶段和气液融合运动阶段。不同阶段对应不同的流体动力学特征,对云团形成的贡献不同。在实验装置总体优化条件下,适当增大比药量可提高云团覆盖面积与体积;在实验范围内长径比不是影响云团状态的显著因素,但长径比较大时可使燃料抛撒均匀性更好;采用钢质壳体时云雾抛撒状态明显优于铝质壳体。实验证明,采用碳钢壳体、比药量3%左右、长径比为3~5且装置参数良好匹配时,可获得理想的云团状态和高威力爆炸波毁伤效应。

Experimental Study on the Influence of Device Parameters of FAE to Fuel Dispersion and Explosive Power

According to observation results of explosive dispersion process of FAE(fuel-air explosive)test device with fast kinematics analysis system,the different dispersion stages of fuel were characterized and the influence of specific central explosive,ratio of height to diameter and shell material to fuel dispersion was studied in this paper.The results show that dispersion process can be divided into the following three phases,jet formation and expansion movement phase,two-direction expansion movement phase and gas-liquid amalgamation movement phase.The different stages of fuel dispersion process correspond with different hydrodynamics characteristics and contribute to the formation of cloud in respective.Under the conditions of general optimization of test device, cloud area and volume were expanded by properly increasing specific central explosive. The ratio of height to diameter was not a remarkable factor influencing cloud status,but larger ratio of height to diameter dispersed fuel better.Cloud dispersion of steel shell was better than that of aluminum shell.It is concluded that ideal detonation status of cloud and high power effect can be attained when the steel shell,specific central explosive about 3% and ratio of height to diameter between 3 and 5 are adopted and are well-matched of three device parameters above.