Development of a Design Methodology Against Fast Cook-Off Threat for Insensitive Munitions

ŞAHİN, Hakan
NARİN, Bekir
Kurtuluş, Dilek Funda
This work provides a design methodology for a typical energetic system to get Type V insensitive munition (IM) response against fast cook-off threat. Experimental and numerical results for a generic test item filled with PBXN-109 explosive are presented. Two key aspects of IM design against fast cook-off threat are investigated, which are "time-to-reaction" and "critical ventilation area". By dividing the problem to pre-ignition and post-ignition, the complexity of the problem is reduced. The first part of the study covers two-dimensional and three-dimensional simulations of the problem, where the generic test item is modelled using commercial CFD software (ANSYS-Fluent). The second part of the study reveals low pressure (2-10 MPa) burning characteristics of a PBXN-109 by strand burner tests. After obtaining the pressure dependent burning rate, a conservation of mass equation is used to determine the chamber pressure using MATLAB Simulink software. Calculations are in reasonable agreement with the experimental results. Calculations are compared with the tests performed. The results are in reasonable agreement with some discrepancies of 8.9% for time to reaction prediction and of 10.9% for ventilation characteristics analyses. Possible reasons of these differences are discussed.


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Investigation of a generic warhead containing plastic bonded explosive under liquid fuel fire by numerical and test methods
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The present work provides a design methodology for a munition against fast cook-off threat for type V insensitivity requirement. The experimental and numerical results for a generic test item (warhead) filled with a PBXN-109 explosive are presented. Two key points for the design of an insensitive munition against fast cook-off threat, which are time to reaction and critical vent area is studied. Dividing the problem as pre-ignition and post- ignition will allow one to manage this complex problem to handle e...
Citation Formats
H. ŞAHİN, B. NARİN, and D. F. Kurtuluş, “Development of a Design Methodology Against Fast Cook-Off Threat for Insensitive Munitions,” PROPELLANTS EXPLOSIVES PYROTECHNICS, pp. 580–587, 2016, Accessed: 00, 2020. [Online]. Available: