An Artillery Recoil Numerical Simulation Of The Flow Field And Erosive Wear Prediction

Recoil absorber is an important part of gun recoil mechanism, during firing process, it produces a certain law of resistance for consuming the recoil energy and limiting the recoil movement within the specified length, which can control the recoil movement. The performance of recoil absorber affects firing stability and reliability directly.Based on the Computational Fluid Dynamics(CFD), it creates a three-dimensional incompressible and viscous model under unsteady condition simulating the turbulent and solid particles movement in the flow field. From the results, it is observed the distribution of velocity, pressure, temperature of the continuous phase and the movement of the discrete phase, the dynamic change trend of parameters in the recoil movement and the flow field characteristics at the corresponding moment can be known. It gives us a great reference to design recoil absorber.After analysing the failure phenomenon of the throttling ring, the cavitation erosion caused by negative pressure and the solid particles scouring are the main reason of throttling ring wear. Based on the Johnson-Cook constitutive model and Johnson-Cook failure model, combined with the equation of state of Gruneisen, finite element method was used for simulating the wear of the different diameter particles impact throttling ring at different angle. Then it came to a conclusion that the throttling ring mass loss more when the impact angle between 15 degrees and 50 degrees, and erosion is more serious when the angle near 45 degrees. The erosion rate is stable when the diameter increases to a certain values. The maximum erosion rate of solid particles to throttling ring in gun recoil liquid is 8.50mg/g. Which provide a theoretical basis for failure prediction and diagnosis of the recoil absorber.