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

Kyung Min Kim, Sung Il Choi, Ki Heon Eom, Gil Hwan Ahn, Jong Gyu Paik, Byung Tae Ryu, Yong Ha Kim and Yong Sun Won
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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

Energies, 2019, vol. 12, issue 2, 1-7

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.

Keywords: Aging; Pyrotechnic Mechanical Devices (PMDs); Flame Temperature; Thermodynamic Analysis; Titanium Hydride Potassium Perchlorate (THPP); Zirconium Potassium Perchlorate (ZPP); Boron Potassium Nitrate (BKNO 3 ) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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