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Journal of Thermal Analysis and Calorimetry

, Volume 138, Issue 6, pp 3939–3947 | Cite as

Development of zirconium and potassium perchlorate igniter for AP/HTPB composite propellant base bleed grain

  • Amir Mukhtar
  • Habib NasirEmail author
  • Badar Rashid
  • Hizba Waheed
Article

Abstract

For effective and reliable ignition of ammonium perchlorate and hydroxyl-terminated polybutadiene (AP/HTPB) solid composite propellant base bleed (BB) grain a simple, reproducible and high-energy igniter composition were studied. Zirconium and potassium perchlorate (ZPP)-based compositions were developed with and without nitrocellulose (NC) lacquer as binder. The effects of different ratios of Zr/KClO4 were investigated by using fuse wire technique for burning rates, bomb calorimeter for calorific value and high-pressure closed vessel (CV) for pressure–time (Pt) curve, pressure maximum (Pmax), time to reach Pmax (tPmax), and rate of change of pressure change (dP/dt). It was observed that composition K-8 with fuel, oxidizer, and binder ratio of 1:1:0.02 gave reliable burning rate, calorific value, Pmax, and dP/dt. After careful analysis of combustion performance, composition K-8 was further investigated for burning rate and Pt data after 10 h of temperature conditioning at − 40 °C, + 21 °C and + 50 °C, respectively. Selected composition was then press-filled in specially designed steel igniter cups which were press-fitted in base bleed kit igniter bodies. Several static firings were performed by initiating igniter with electric squib for recording the burning time, igniter mass burning behavior, and reproducibility of successful ignition results. ZPP igniter was finally fitted in base bleed kit equipped with AP/HTPB composite propellant BB grain and tested on static as well as dynamic level by firing with 155-mm artillery projectile. Dynamic testing after temperature conditioning of complete projectile equipped with BB kit at + 21 °C, + 50 °C and − 40 °C for 24 h. Igniter provided successful ignition to base bleed grain until it achieved stable burning. All fired rounds achieved enhanced range of 30% approximately, with controlled uniform muzzle velocity and chamber pressure. ZPP igniter is recommended to be used for AP/HTPB solid composite propellant base bleed grain.

Keywords

Base bleed Closed vessel Potassium perchlorate Zirconium 

Notes

Acknowledgements

This research work was completely sponsored by Pakistan Ordnance Factories (POFs) Wah Cantonment, Pakistan. POFs provided all materials, manufacturing, and testing facilities.

Supplementary material

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Supplementary material 1 (DOCX 11 kb)

Supplementary material 2 (MOV 126974 kb)

10973_2019_8317_MOESM3_ESM.mp4 (7.8 mb)
Supplementary material 3 (MP4 7984 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Amir Mukhtar
    • 1
  • Habib Nasir
    • 2
    Email author
  • Badar Rashid
    • 3
  • Hizba Waheed
    • 1
  1. 1.School of Chemical and Materials EngineeringNational University of Sciences and TechnologyIslamabadPakistan
  2. 2.School of Natural SciencesNational University of Sciences and TechnologyIslamabadPakistan
  3. 3.Wah Engineering CollegeUniversity of WahWah CantonmentPakistan

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