Numerical Simulation of Missile Jet Deflector

摘要

A numerical simulation was carried out to estimate the heat flux on a jet deflector caused due to impingement of the rocket exhaust of a canisterized missile. Three-dimensional Navier-Stokes equations were solved along with shear-stress transport k-omega turbulence model using commercial computational fluid dynamics software. The firings of a short-burn rocket motor as well as a full-burn rocket motor with a jet vane are simulated. Jet vanes are found to have significant influence in the plume spreading and impinging heat flux rate. The measured erosion patterns of both the rocket motors are seen to scale with the computed heat flux. In spite of the different jet characteristics of the two motors, it is observed that the erosion rate per megawatt per square meter heat flux rate is not very different. It is demonstrated that erosion of the composite liner due to jet impingement is mostly dependent on the heat flux on the deflector surface.