ANALYSIS OF THE EFFECT OF PROPELLANT TEMPERATURE ON INTERIOR BALLISTICS PROBLEM

This study investigates the effect of conditioning temperature of double base propellants on the interior ballistic parameters such as burning gas temperature, barrel wall temperature, pressure and stresses generated in the barrel. Interior ballistic problem was solved employing experimental, numerical and analytical methods with a thermo-mechanical approach. Double base propellants were conditioned at different temperatures (52, 35, 21, 0, -20, -35, -54ºC). The maximum pressure in the barrel and projectile muzzle velocity were measured for all the propellants by conducting shooting tests with a special test barrel using 7.62x51 mm NATO ammunition. Vallier-Heydenreich method was employed to determine the transient pressure distribution along the barrel. The temperature of burnt gases was calculated by using Noble-Abel equation. The heat transfer analysis was done using the commercial software ANSYS to get the transient temperature and stress distributions. Temperature distribution through the barrel wall thickness was validated using a FLIR thermal imager. Radial, circumferential and axial stresses and corresponding equivalent Von Misses stresses were determined numerically and analytically. The results of the analytical solution for stress analysis validated the finite element solution of interior ballistic problem. Increasing the initial temperature of the propellant resulted in higher temperature and pressure inside the barrel which in turn increased the stresses in the barrel.

Keywords:

Interior Ballistics, Heat Transfer Stress Analysis, Experimental Verification,

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[1] Jaramaz, S., Micković, D., & Elek, P. (2011). Two-phase flows in gun barrel: Theoretical and experimental studies. International Journal of Multiphase Flow, 37(5), 475-487.
[2] Akcay, M., & YÜKSELEN, M. A. (2014). Unsteady thermal studies of gun barrels during the interior ballistic cycle with non-homogenous gun barrel material thermal characteristics. J. Therm. Sci. Technol., 34(2), 75-81.
[3] Sun, Y., & Zhang, X. (2015). Transient heat transfer of a hollow cylinder subjected to periodic boundary conditions. Journal of Pressure Vessel Technology, 137(5), 051303.
[4] Nelson, C. W., & Ward, J. R. (1981). Calculation of heat transfer to the gun barrel wall (No. ARBRL-MR-03094). Army Ballistic Research Lab Aberdeen Proving Ground Md.
[5] Conroy, P. J. (1991). Gun tube heating (No. BRL-TR-3300). Army Ballistic Research Lab Aberdeen Proving Ground Md.
[6] Mishra, A., Hameed, A., & Lawton, B. (2010). Transient thermal analyses of midwall cooling and external cooling methods for a gun barrel. Journal of Heat Transfer, 132(9), 091901.
[7] Cronemberger, P. O., Lima Junior, E. P., Gois, J. A. M., & Caldeira, A. B. (2014). Theoretical and experimental study of the interior ballistics of a rifle 7.62. Engenharia Térmica (Thermal Engineering), 13(2), 20-27.
[8] Hill, R. D., & Conner, J. M. (2012). Transient heat transfer model of machine gun barrels. Materials and Manufacturing Processes, 27(8), 840-845..
[9] Değirmenci, E., & Dirikolu, M. H. (2012). A thermochemical approach for the determination of convection heat transfer coefficients in a gun barrel. Applied Thermal Engineering, 37, 275-279.
[10] Şentürk, A., Işık, H., & Evci, C. (2016). Thermo-mechanically coupled thermal and stress analysis of interior ballistics problem. International Journal of Thermal Sciences, 104, 39-53.
[11] Değirmenci, E., Evci, C., Işık, H., Macar, M., Yılmaz, N., Dirikolu, M. H., & Çelik, V. (2016). Thermo-mechanical analysis of double base propellant combustion in a barrel. Applied Thermal Engineering, 102, 1287-1299.
[12] Farrar, C. I., & Leeming, D. W. (1983). Military Ballistics a Basic Manual, Battlefield Weapons Systems and Technology, vol. 10. Royal Military College of Science, Shrivenham, UK.
[13] AMCP 706-150 (1965). “Interior ballistics of guns”, Ballistics series of the U.S.Army Materiel Command Engineering Design Handbook.
[14] John Corner. (1950). Theory of the interior ballistics of guns. Wiley. [15] AMCP 706-247, “Design For Projection”, Engineering Design Handbook, Ammunition Series of the U.S.Army Materiel Command, 1973.
[16] Cengel, Y. A. (2003). Heat Transfer: A Practical Approach McGrawHill. New York, 492.
[17] AEP-97 “Multi calibre manual of proof and inspection (M-C MOPI) for 5.56 mm, 7.62 mm, 9 mm and 12.7 mm ammunition”, NATO Standard, NATO Army Armaments Group (NAAG), NATO Standardization Agency (NSA).

Başlangıç: 2015
Yayıncı: YILDIZ TEKNİK ÜNİVERSİTESİ

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