Investigation of a generic warhead containing plastic bonded explosive under liquid fuel fire by numerical and test methods

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2015
Şahin, Hakan
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 easier than its original form. The first part of the study covers 2-D and 3-D simulations of the problem by modeling the generic test item geometry by commercial CFD software (ANSYS - Fluent). The second part of the study reveals low pressure (2-10 MPa) burn characteristics of a PBXN-109 by strand burner tests. After obtaining pressure dependent burning rate, conservation of mass equation is used to determine the chamber pressure using MATLAB Simulink software. Calculations are compared with the tests performed. Results are seen to be in reasonable agreement with some discrepancies at 8.9% for time to reaction prediction and at 10.9% for ventilation characteristics analyses. Possible reasons of these differences are discussed in this study.
Citation Formats
H. Şahin, “Investigation of a generic warhead containing plastic bonded explosive under liquid fuel fire by numerical and test methods,” M.S. - Master of Science, Middle East Technical University, 2015.