火焰引发剂的数值研究及其对安全气囊充气机应用的影响:弹道建模和功能分析

Q4 Energy
Peng Li, Chi-Yao Chang, A. Sadiki
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引用次数: 2

摘要

本文提出了一种描述商用起爆剂弹道性能的数值模型。该模型基于质能守恒原理,在多相框架下结合多载荷条件建立。在获得各复合材料的晶粒尺寸分布信息后,根据复合材料的表面积比提出固定系数。在此基础上,描述了基于分布粒度的固体推进剂燃烧过程,并根据Vieille定律重新评估了不同预置温度水平下所使用的烟火药组合物的燃烧速率参数。根据观测结果,进一步模拟了桥丝和引发剂金属帽对其特性的影响。在封闭炸弹试验中对整个启动器模型的验证显示了与测量压力演变的定量一致,而评估每个组件的弹道灵敏度的参数研究为产品开发过程提供了一些见解。此外,利用冷气体充气机的配置来评估实际应用中的启动器冲击,其中部署期间的冲击波强度在充气机设计中起主要作用。结合CFD仿真捕捉激波传播,实现了起爆弹道与充气机构型的0D-3D耦合策略。此外,仿真结果较好地反映了实际情况。特别是,参数研究使人们更好地理解了充气机组件之间的相互作用,这几乎不可能通过测量来量化。提出的启动器模型也可以与其他机械原理结合使用,作为烟火装置的组成部分,如拔针器、电动割线器或安全气囊充气机。在描述物理特性中获得的详细信息使我们能够定量地评估现有的设计,并更好地控制产品质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Investigation of Pyrotechnical Initiators and Their Impact in Airbag Inflator Applications: Ballistic Modeling and Functional Analysis
A numerical model describing the ballistic behavior of a commercially used initiator is presented in this article. This model was built on the principle of conservation of mass and energy in the multi-phase framework incorporated with multi-loaded conditions. After obtaining the information about the grain size distribution in each composite, a fixing factor was proposed based on the surface area ratio of the composites. Thus, the solid propellant burning process based on distributed grain size was described, and the burn rate parameters of the applied pyrotechnic compositions were re-evaluated for different preconditioned temperature levels according to Vieille’s law. The influence of bridge wire and initiator metal cap was further modeled concerning their characteristic properties according to the observed measurements. The validation of the entire initiator model in the closed bomb test showed quantitative agreement with the measured pressure evolution, while the parameter study for evaluating the ballistic sensitivity of each component delivered some insights into the product development process. Furthermore, the configuration of a cold gas inflator was utilized to evaluate the initiator impact for a realistic application, where the shock wave intensity during deployment serves the main function in the inflator design. Incorporated with CFD simulations to capture the shock wave propagation, 0D-3D coupling strategy for initiator ballistics to inflator configuration was realized. Besides, the simulation results reflected the physical conditions in a proper manner. In particular, the parameter study led to a better understanding of interactions between inflator components, which were barely possible to be quantified through the measurements. The proposed initiator model could also be used in combination with other mechanical principles as a component of pyrotechnic devices such as pin-puller, electric line cutters, or airbag inflators. The detailed information gained in describing the physical properties enabled us to assess the existing design quantitatively and to have better control of the product quality.
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来源期刊
Journal of Nuclear Energy Science and Power Generation Technology
Journal of Nuclear Energy Science and Power Generation Technology Energy-Energy Engineering and Power Technology
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