Analysis And Research On Temperature Field And Thermal Deformation Of Tank Gun Barrel

This paper combines the temperature field and thermal deformation of a large caliber tank gun under two different firing conditions,as well as the optimization analysis of the thermal radiation test and material of the exhaust device.It provides theoretical basis and data support for improving the life rate of tank guns under different firing conditions and different light intensity environments.The main tasks are as follows:(1)The theoretical numerical calculation of heat transfer is added on the basis of the traditional interior ballistic theory.By writing a solution program in Matlab,the temperature distribution of the core flow in the gun bore during the interior ballistic period and the variation law of the convective heat transfer coefficient with time and on the barrel axis are calculated,laying the foundation for the subsequent accurate calculation of the temperature field of the tank barrel.The maximum calculated bottom pressure is 510.3MPa,and the muzzle velocity of the projectile is 1636.8m/s.(2)Based on the heat transfer theory,a heat transfer simulation model was built to analyze the temperature distribution of the barrel section at the moment when the projectile exits the muzzle under the conditions of single shot interval firing and group interval firing,as well as the temperature distribution of the front and rear sections of the air extraction device.The temperature of the inner wall of the barrel near the position of the air extraction device during the two firing processes was monitored,and the temperature of the tail of the barrel The average temperature of the inner wall at the position of the barrel suction device and 0.3m away from the muzzle are 120℃,660℃and 570℃,respectively.Comparative analysis and research were conducted on the simulated temperature of the outer wall at the key position and the temperature measured in the experiment.(3)According to the coupled analysis process of the thermal structure of the gun barrel,the corresponding temperature field at the corresponding time is applied as a transient thermal load to the gun barrel.The stress strain analysis and calculation of the barrel are carried out to obtain the equivalent stress distribution on the centerline of the upper and lower surfaces of the barrel.At the same time,the displacement changes of the barrel in the plumb plane under single engine interval firing conditions and group interval firing conditions are also obtained,The focus was on the upward deflection of the barrel suction device under continuous firing,and the reasons for the displacement differences caused by two different operating conditions were analyzed and studied.The calculated values of the last muzzle lift for single engine interval firing conditions and group interval firing conditions were 1.15 mm and 1.98 mm,respectively.Research analysis shows that as the number of bullets increases during the shooting process,the upward deflection of the barrel axis also increases.(4)This paper conducted two sets of on-site thermal radiation testing tests on the installation of non-metallic and metallic material extraction devices for the barrel,analyzing the effects of different material extraction devices on the curvature of the barrel barrel muzzle,the amount of muzzle sagging,and the position sagging of the extraction device.When installing a non-metallic suction device,the curvature and droop of the barrel nozzle are 0.3mil and 0.12 mil,respectively,while when installing a metal suction device,the curvature and droop of the barrel nozzle are 0.35 mil and 0.14 mil,respectively.Experiments have shown that under the same conditions,metal materials have a greater impact on barrel deformation than nonmetallic material extraction devices.(5)An analysis was conducted on the structure of the tank gun exhaust device and the working principle of the exhaust device during the entire process of projectile launch.The material of the barrel exhaust device was optimized and analyzed.The overall upward deflection of the barrel axis was reduced,especially at the muzzle position,where the maximum upward displacement became 0.9mm.The simulation results showed that fiberglass can indeed achieve uniform heat transfer in the barrel,providing a new solution for the optimization of the tank gun exhaust device.