Heat transfer analysis of barrel during continuous firing of small caliber artillery based on inverse heat conduction problem

The transient heat transfer finite element model of a 30mm caliber gun with a local barrel is established for the temperature distribution characteristics of the barrel during continuous high frequency firing of small caliber guns. Combining the classical internal ballistics theory and heat transfer principle, the heat flux of the high temperature gas of gunpowder in the barrel is calculated based on the inverse heat conduction problem model. In this paper, the heat flux distribution is used as the heat load condition of barrel heat transfer, and the temperature distribution characteristics of barrel at different flame temperatures during continuous firing are analyzed based on LS-DYNA. The results show that during the continuous firing of the gun, the heat flux of the inner chamber of the barrel changes exponentially, and the higher the flame temperature, the greater the peak heat flux. The temperature of the inner wall of the barrel is characterized by sawtooth-shaped pulse change. The higher the flame temperature, the more heat is accumulated in the barrel, which makes the temperature of the barrel rise more quickly.