Combustion Modeling of Explosive for Pyrotechnic Initiator

Cha, Seung-Won; Woo, Jeongmin; Kim, Yongchan; Oh, Seok-Hwan; Cho, Jin Yeon; Kim, Jeong-Ho; Jang, Seung-gyo; Yang, Hee Won; Roh, Tae‐Seong

doi:10.6108/kspe.2017.21.6.039

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The fixed volume of the chambers and the measured maximum pressure are shown in Table 4 for each type of explosive charge. These values are extracted from references [16,21]. Figure 6 illustrates the data shown in Table 4.…”

Section: Correction Of Governing Equations Using Cbt Datamentioning

confidence: 99%

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Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO₃ in Pyroshock‐Reduced Separation Nut

Woo

Cha

Kim

et al. 2020

Propellants Explo Pyrotec

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Although BKNO 3 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 BKNO 3 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 com-bustion 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.

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Section: Correction Of Governing Equations Using Cbt Datamentioning

confidence: 99%

“…Many studies have been performed to model the combustion of ZPP. However, the number of modeling studies for BKNO 3 [15][16][17] is more limited than expected, given its long history and widespread use.…”

Section: Introductionmentioning

confidence: 99%

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO₃ in Pyroshock‐Reduced Separation Nut

Woo

Cha

Kim

et al. 2020

Propellants Explo Pyrotec

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“…Figure23 Pressure evolution at the selected monitoring points (Figure21). Values are normalized by the initial pressure level of the filled gas in the inflator.…”

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confidence: 99%

Numerical Investigation of Pyrotechnical Initiators and Their Impact in Airbag Inflator Applications: Ballistic Modeling and Functional Analysis

Chang¹,

Sadiki²

2021

JEPT

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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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Design and Margin Verification of a Through Bulkhead Initiator Applicable to Flexible Confined Detonating Cord

Kang

Jang

Han

et al. 2023

Int. J. Aeronaut. Space Sci.

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Combustion Modeling of Explosive for Pyrotechnic Initiator

Cited by 7 publications

References 11 publications

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO₃ in Pyroshock‐Reduced Separation Nut

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO₃ in Pyroshock‐Reduced Separation Nut

Numerical Investigation of Pyrotechnical Initiators and Their Impact in Airbag Inflator Applications: Ballistic Modeling and Functional Analysis

Design and Margin Verification of a Through Bulkhead Initiator Applicable to Flexible Confined Detonating Cord

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Combustion Modeling of Explosive for Pyrotechnic Initiator

Cited by 7 publications

References 11 publications

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO3 in Pyroshock‐Reduced Separation Nut

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO3 in Pyroshock‐Reduced Separation Nut

Numerical Investigation of Pyrotechnical Initiators and Their Impact in Airbag Inflator Applications: Ballistic Modeling and Functional Analysis

Design and Margin Verification of a Through Bulkhead Initiator Applicable to Flexible Confined Detonating Cord

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Product

Resources

About

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO₃ in Pyroshock‐Reduced Separation Nut

Concept of Unburning Ratio and Combustion Modeling of ZPP and BKNO₃ in Pyroshock‐Reduced Separation Nut