Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO3 in Pyroshock‐Reduced Separation Nut,Propellants, Explosives, Pyrotechnics

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Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO3 in Pyroshock‐Reduced Separation Nut
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-03-09 , DOI: 10.1002/prep.201900255
Jeongmin Woo ₁ , Seung‐Won Cha ₁ , Gyubin Kim ₁ , Jeong Ho Kim ₁ , Tae‐Seong Roh ₁ , Jin Yeon Cho ₁ , Seung‐Gyo Jang ₂ , Hyo‐Nam Lee ₂ , Hee Won Yang ₃

Affiliation

Although BKNO₃ ignited by ZPP is commonly used as an explosive charge for many pyrotechnics, only a limited number of modeling studies can be found in the literature. Thus, recently proposed governing equations for combustion modeling of ZPP are supplemented to simulate the combustion of the BKNO₃ with ZPP. The combustion model was independently validated using CBT results with fixed volume chambers of various sizes. In this process, the concept of the unburning ratio was introduced to correlate the combustion modeling with actual phenomena. The term “unburned” means that some fraction of explosive charge turns into non‐reactive solid rather than into combustion products. The model was then coupled with the equations of motion for the internal moving parts of a pyroshock‐reduced separation nut. Tests with prototype were performed to validate the coupled model. For accurate verification, the pressure of the expansion chamber and annular chamber and the displacement of the bolt were measured and compared. All measurements are in good agreement with the analysis results obtained from the coupled model. The results validated the generality of the modeling approach for the simulation of the pyroshock‐reduced separation nut.

中文翻译：

焦炭减少分离螺母中ZPP和BKNO3的不燃比概念及燃烧模型

尽管ZPP点燃的BKNO ₃通常被许多烟火炸药用作炸药，但文献中只能发现有限的模型研究。因此，补充了最近提出的用于ZPP燃烧模型的控制方程，以模拟BKNO ₃的燃烧与ZPP。使用CBT结果对各种尺寸的固定容积燃烧室进行独立验证，得出燃烧模型。在此过程中，引入了不燃比的概念，以使燃烧模型与实际现象相关联。术语“未燃烧”是指炸药的一部分变成非反应性固体，而不是燃烧产物。然后，将模型与减少热震的分离螺母内部运动部件的运动方程式耦合。用原型进行测试以验证耦合模型。为了进行准确验证，对膨胀室和环形室的压力以及螺栓的位移进行了测量和比较。所有测量结果均与从耦合模型获得的分析结果高度吻合。

更新日期：2020-03-09

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