Simulation Calculation Of A Gas Flow Field Emitted By A Launch Vehicle

Launch vehicle has a long launch period and spend a lot of manpower and material resources every time.In order to save costs and shorten the launch period,usually people alter the abandoned missile-rocket launch field to get a simple needed launch field for fast and easy launch.In order to study the development about the gas flow field of the rocket engine,and its impact on the ground-launched equipment,use the fast and easy launch rocket and its launch field as a example,build and simplify its integration model,then use the computational fluid dynamics software Fluent to simulate the change of tail flame flow field and the effect of jet on the ground surface of the rocket at different positions in different conditions.As following:(1)For the irregular calculation model,use the partitioned grid technology dividing it into some adjacent parts,then do the structured meshing for every part.Using the district docking grid technology to make sure that data can be transmitted between parts.The grid fits any boundary shapes of flowing fields and improves the calculative precision at boundary values.In complex and intense changed flowing area,the mesh is encrypted,which makes the capture of the shock structure in the flowing field clearer.(2)For the axisymmetric model of single nozzle,a mathematical calculation model of viscous compressible nozzle flow and jet flow under steady conditions is established.Then consider the mixed gas,use finite volume method based on density and the Roe scatter method in flux difference splitting scheme to simulate the flow field of the rocket at different positions.Analyzed the simulation results,obtained the changing process and development trend of the complex shock wave structure and flowing parameters in the flowing field and the impact and ablation of the gas jet on the ground.(3)For the three-dimensional steady model of double nozzle,simulate the tail-flame flowing field of the rocket in different position.The results show the whole process of the generation and development of the shock wave and the parameters of the flowing field at different position int different time.They also show the impact of gas jet on the ground at different positions and the distribution law of jet pressure and temperature on ground,which can guide the engineering practice.