The objective of this research was to develop and to experimentally validate a method to predict the blast performance of thermobaric annular charges based on isopropyl nitrate-aluminium and RDX-isopropyl nitrate-aluminium. Overpressure and thermal output were investigated in open air using piezoelectric pressure transducers, high speed visible and infrared imaging. Prediction of the explosive transformation of the annular thermobaric charge was computed by thermochemical code EXPLO5® using the Chapman-Jouguet (ideal detonation) and non-ideal Wood and Kirkwood (WK) detonation model. The Jones-Wilkins-Lee (JWL) parameters obtained in the calculations were used in hydrocode numerical simulation using AUTODYN® in order to predict the incident overpressure, total impulse and arrival time. Additional energy attributed to aluminium afterburning was used in order to simulate the post-combustion phase. For isopropyl nitrate-aluminium based charges, both BKW and WK models estimate correctly the peak overpressure and arrival time, while the total impulse was more accurately calculated by WK non-ideal detonation model. For the RDX-containing formulation, the prediction of peak overpressure, total impulse and arrival time are in agreement with the predictions obtained using WK non-ideal detonation model with additional energy. The performances of the investigated thermobaric charges were compared with an equivalent mass charge of TNT, confirming both the expected higher total impulse and higher peak overpressures in the case of RDX-isopropyl nitrate-aluminium based thermobaric charges. Thermal measurements highlighted two distinct phases, an anaerobic phase and the post combustion of the thermobaric compositions. In terms of thermal output, the RDX-isopropyl nitrate-aluminium thermobaric based charge manifests superior performances.

中文翻译：

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一种估计 RDX-IPN-Al 环形热压装药爆炸性能的方法

本研究的目的是开发并通过实验验证一种基于硝酸异丙酯铝和 RDX-硝酸异丙酯铝的温压环形炸药爆炸性能预测方法。使用压电压力传感器、高速可见光和红外成像在露天环境中研究了超压和热输出。环形温压装药爆炸转变的预测是通过热化学代码 EXPLO5® 使用 Chapman-Jouguet（理想爆炸）和非理想 Wood and Kirkwood (WK) 爆炸模型计算的。计算中获得的 Jones-Wilkins-Lee (JWL) 参数用于使用 AUTODYN® 的水代码数值模拟，以预测事故超压、总脉冲和到达时间。为了模拟燃烧后阶段，使用了归因于铝后燃烧的额外能量。对于硝酸异丙酯-铝基装药，BKW 和 WK 模型都正确估计了峰值超压和到达时间，而 WK 非理想爆震模型更准确地计算了总冲量。对于含有 RDX 的配方，峰值超压、总脉冲和到达时间的预测与使用具有附加能量的 WK 非理想爆震模型获得的预测一致。将所研究的温压装药的性能与 TNT 的等效质量装药进行比较，证实了在 RDX-硝酸异丙酯-铝基温压装药的情况下，预期的更高的总脉冲和更高的峰值超压。热测量突出了两个不同的阶段，厌氧阶段和温压组合物的后燃烧。在热输出方面，基于RDX-硝酸异丙酯-铝温压的装药表现出优异的性能。