• Title/Summary/Keyword: Energetic material

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Mathematical and Experimental Study for Mixed Energetic Materials Combustion in Closed System

  • Kong, Tae Yeon;Ryu, Byungtae;Ahn, Gilhwan;Im, Do Jin
    • Korean Chemical Engineering Research
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    • v.60 no.2
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    • pp.267-276
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    • 2022
  • Modelling the energy release performance of energetic material combustion in closed systems is of fundamental importance for aerospace and defense application. In particular, to compensate for the disadvantage of the combustion of single energetic material and maximize the benefits, a method of combusting the mixed energetic materials is used. However, since complicated heat transfer occurs when the energetic material is combusted, it is difficult to theoretically predict the combustion performance. Here, we suggest a theoretical model to estimate the energy release performance of mixed energetic material based on the model for the combustion performance of single energetic material. To confirm the effect of parameters on the model, and to gain insights into the combustion characteristics of the energetic material, we studied parameter analysis on the reaction temperature and the characteristic time scales of energy generation and loss. To validate the model, model predictions for mixed energetic materials are compared to experimental results depending on the amount and type of energetic material. The comparison showed little difference in maximum pressure and the reliability of the model was validated. Finally, we hope that the suggested model can predict the energy release performance of single or mixed energetic material for various types of materials, as well as the energetic materials used for validation.

Synthesis of Tetrazole-containing Energetic Copolymers (테트라졸을 포함한 에너지 함유 공중합체의 합성)

  • Shin, Jung-Ah
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.4
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    • pp.726-731
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    • 2011
  • Polymers containing tetrazole groups are very attractive as energetic materials. Copolymer having tetrazole groups could be obtained by 3-steps from commercially available epichlorohydrin. These methods provide a new synthetic pathway to construct polymers containing tetrazole groups from non-energetic polynitrile compounds. These polymers are expected to be good candidates for green and high energetic materials.

How to Prepare the Manuscript for Submission to the Proceedings of KSPE Conference (고에너지 물질 연소를 기반으로 한 Multi Physics Modeling)

  • Kim, Ki-Hong;Yoh, Jai-Ick
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.04a
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    • pp.238-241
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    • 2007
  • We present an innovative method of multi-physics application involving energetic materials. Energetic materials are related to reacting flows in extreme environments such as fires and explosions. They typically involve high pressure, hish temperature, strong non-linear shock waves, and high strain rate deformation of metals. We use an Eulerian methodology to address these problems. Our approach is naturally free from large deformation of materials that makes it suitable for high strain-rate multi-material interaction problems. Furthermore we eliminate the possible interface smearing by using the level sets. We have devised a new level set based tracking framework that can elegantly handle large gradients typically found in reacting gases and metals. We show several work-in-progress applications of our algorithm including the Taylor impact test, explosive venting and additional confined explosion problems of modem interest.

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Innovative Modeling and Simulation of Reacting Flow with Complex Confined Boundaries

  • Kim, Ki-Hong;Yoh, Jai-Ick
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.03a
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    • pp.311-319
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    • 2008
  • We present an innovative method of multi physics application involving energetic materials. Energetic materials are related to reacting flows in extreme environments such as fires and explosions. They typically involve high pressure, high temperature, strong shock waves and high strain rate deformation of metals. We use an Eulerian methodology to address these problems. Our approach is naturally free from large deformation of materials that make it suitable for high strain rate multi-material interacting problems. Furthermore we eliminate the possible interface smearing by using the level sets. We heave devised a new level set based tracking framework that can elegantly handle large gradients typically found in reacting gases and metals. We show several work-in-progress application of our integrated framework.

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Numerical Method Aimed at Multi-material Simulation of the Energetic Device (에너지 물질이 포함된 장치의 폭발 해석을 위한 다중물질 해석 방법)

  • Kim, Ki-Hong;Yoh, Jai-Ick
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.274-278
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    • 2011
  • We present an innovative method of multi-physics application involving energetic materials. We use an Eulerian methodology to address these problems. We have devised a new level set based tracking framework that can elegantly handle large gradients typically found in energetic response of high explosive and metals. Proper constitutive relations are employed to model the transient phases of gas, lliquid, and solid in the high strain rate regime. We use the confined and unconfined rate stick results to validate against the experimental data.

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An Efficient Synthesis of GUDN as Green Oxidizer (친환경 산화제 GUDN의 효율적 합성)

  • Sul, Min-Jung;Joo, Young-Hyuk;Jeong, Won-Bok;Park, Young-Chul
    • Journal of the Korean Society of Propulsion Engineers
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    • v.17 no.6
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    • pp.97-104
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    • 2013
  • N-Guanylurea dinitramide (GUDN) is an energetic material with low sensitivities and good performance for use as propellants or insensitive munitions explosives. The efficient synthesis and characterization of high energy density material of GUDN is reported. GUDN was characterized spectroscopically as well as elemental analysis. In addition, the heats of formation were calculated with the Gaussian 09 suite of programs. For initial safety testing, the impact sensitivity and the friction sensitivity were tested following BAM procedure.

Kinetics analysis of energetic material using isothermal DSC (등온 DSC를 이용한 고에너지 물질의 정밀 반응 모델 기법 개발)

  • Kim, Yoocheon;Park, Jungsu;Kwon, Kuktae;Yoh, Jai-ick
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.219-222
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    • 2015
  • The kinetic analysis of energetic materials using Differential Scanning Calorimetry (DSC) is proposed. Friedman Isoconversional method is applied to DSC experiment data and AKTS software is used for analysis. The frequency factor and activation energy are extracted as a function of product mass fraction. The extracted kinetic scheme does not assume multiple chemical steps to describe the response of energetic materials; instead, multiple set of Arrhenius factors are used in describing a single global step. The proposed kinetic scheme has considerable advantage over the standard method based on One-Dimenaionl Time to Explosion (ODTX). Reaction rate and product mass fraction simulation are conducted to validate extracted kinetic scheme. Also a slow cook-off simulation is implemented for validating the applicability of the extracted kinetics scheme to a practical thermal experiment.

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Shock compression of condensed matter using multi-material Reactive Ghost Fluid method : development and application (충격파와 연소 현상 하에서의 다중 물질 해석을 위한 Reactive Ghost Fluid 기법 개발 및 응용)

  • Kim, Ki-Hong;Yoh, Jai-Ick
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.6
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    • pp.571-579
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    • 2009
  • For the flow analysis of reactive compressible media involving energetic materials and metallic confinements, a Hydro-SCCM (Shock Compression of Condensed Matter) tool is developed for handling multi-physics shock analysis of energetics and inerts. The highly energetic flows give rise to the strong non-linear shock waves and the high strain rate deformation of compressible boundaries at high pressure and temperature. For handling the large gradients associated with these complex flows in the condensed phase as well as in the reactive gaseous phase, a new Eulerian multi-fluid method is formulated. Mathematical formulation of explosive dynamics involving condensed matter is explained with an emphasis on validating and application of hydro-SCCM to a series of problems of high speed multimaterial dynamics in nature.