Numerical Simulation Of Aerodynamic Ablation For The Hypersonic Projectile

With the development of science and technology, conventional weapons are also seeking the high velocity, high precision, high power and long-range. The velocity of a projectile can be accelerated to a few kilometers per second by the new concept kinetic energy weapons. As the maximum muzzle velocity, the projectile have the aerodynamic ablation in the flight. In this paper, the aerodynamic ablation of the hypersonic projectiles fired by new type weapons have been studied. Coupled heat transfer of aeroheating /structural heat and process of ablation are numerical simulated.First, computational model and numerical simulation methodology about the projectile flight at hypersonic velocity were established. The two-dimensional compressible N-S equations were used as governing equations. The S-A turbulent model and P-1 radiation model was considered in this dissertation.Aerodynamic heating of the projectile was calculated. Example 15°blunt cone, the results are compared well with experiment; Aeroheating and structural heat of the projectile was coupled calculated. Example a two-dimensional cylinder, the results are compared well with experiment.Dynamic mesh method is applied to solve mesh distortion resulting from the aerodynamic ablation of the projectile. With the user interface of FLUENT, two-sided wall is coupling on movement.Example one type projectile, the deformation of projectile are numerical simulated, the results are compared well with engineering algorithm. At the conditions of different altitudes, velocity, shapes, the deformation of projectile are numerical simulated. The ablation profiles of the projectile are given in chronological orders. The results showed that the velocity of the projectile have obvious effect on the aerodynamic ablation.This research has some reference value on hypersonic projectile material selection and shape design.