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Thermodynamic Analysis on the Aging of THPP, ZPP and BKNO 3 Explosive Charges in PMDs

Author

Listed:
  • Kyung Min Kim

    (Department of Chemical Engineering, Pukyong National University, Busan 48547, Korea)

  • Sung Il Choi

    (Department of Chemical Engineering, Pukyong National University, Busan 48547, Korea)

  • Ki Heon Eom

    (Department of Chemical Engineering, Pukyong National University, Busan 48547, Korea)

  • Gil Hwan Ahn

    (Defence R&D center, Hanwha Corporation, Daejeon 34068, Korea)

  • Jong Gyu Paik

    (Agency for Defense Development, Daejeon 34183, Korea)

  • Byung Tae Ryu

    (Agency for Defense Development, Daejeon 34183, Korea)

  • Yong Ha Kim

    (Department of Chemical Engineering, Pukyong National University, Busan 48547, Korea)

  • Yong Sun Won

    (Department of Chemical Engineering, Pukyong National University, Busan 48547, Korea)

Abstract

The aging of explosive charges in pyrotechnic mechanical devices (PMDs) significantly affects the reliability of their performance. Aging decreases the explosive power of explosive charges via pre-oxidation by external sources of oxygen. In this study, the flame temperature was calculated based on the amount of added oxygen source, and the effect of aging was quantified in terms of the performance of explosive charges. Three primary explosive charges (THPP, ZPP, and BKNO 3 ) were selected, and the explosion was assumed to have occurred in a closed adiabatic system. The flame temperature decreased with increasing oxygen addition, suggesting that the aging decreased the pressure exerted by the PMDs. The explosive power decreased in the following order: ZPP >> THPP > BKNO 3 (4100 >> 3260 > 3050 K), and it was decreased by aging as follows: ZPP >> BKNO 3 > THPP (802 >> 219 > 95 K per mole of added water). As a result, ZPP is appropriate for the generation of the huge thrust of PMDs despite its increased susceptibility to aging, while THPP is superior for reliable PMD performance.

Suggested Citation

  • Kyung Min Kim & Sung Il Choi & Ki Heon Eom & Gil Hwan Ahn & Jong Gyu Paik & Byung Tae Ryu & Yong Ha Kim & Yong Sun Won, 2019. "Thermodynamic Analysis on the Aging of THPP, ZPP and BKNO 3 Explosive Charges in PMDs," Energies, MDPI, vol. 12(2), pages 1-7, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:2:p:209-:d:196368
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