Research on Nozzle Structure of Cutting Ammunition Based on Self-propagating Cutting Technology
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摘要:为满足抢险救灾、战场抢修等无外界能源条件的应急切割要求，针对一种无需外界能源、基于自蔓延切割技术的切割弹关键部件喷管进行了研究，通过理论分析、建模仿真、试验验证确定合理的结构参数，提高切割弹的切割效率。研究表明，喷管参数中的收敛角(β)、曲率半径与出口半径比值(R/Rt)对喷管的效率影响较大；本切割弹采用渐缩型喷管，当β为45°且R/Rt为1.5时，出口的金属射流流速稳定，对铝合金、黄铜和Q235钢的切割效果均较好。
Abstract:In order to meet the demands of emergency cutting such as disaster relief and battlefield repair etc., a kind of cutting ammunition based on self-propagating reaction technology without external energy was designed, and the key component of nozzle was studied. Through theoretical analysis, modeling and simulation, and test verification, the reasonable structural parameters of nozzle were determined, to improve the cutting efficiency of the cutting projectile. The results show that the angle of convergence (β) and the ratio of radius of curvature to radius of exit (R/Rt) have an important effect on the efficiency of nozzle. As the conclusion, convergent nozzle is applied to the design of cutting ammunition, the value of β is about 45°and R/Rt is equal to 1.5, which make the exports velocity of metal jets stable and better cutting effect for aluminum alloy, copper and Q235 steel.
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