Numerical Simulation Of Flow And Structural Field In Air Inlet Of The Solid Ducted Rocket

The solid ducked rocket (SDR) combines the advantages of solid propellant rocket and ramjet propulsion. It offers considerable advantages for missile propulsion, suck as high specific impulse, high speed, lightweight, long range, high maneuver and simple structure. As the major direction of the propulsion system for supersonic missile, the ducted rocket has promising prospect. It is one of the key techniques for SDR to design the air inlet, which uses its high speed to improve the pressure, to convert kinetic energy into its potential energy efficiently and provide the mass flow for the inlet of this kind SDR.With the development of the modern Computational Fluid Dynamics (CFD), we can simulate the working condition for the air inlet. Namely we simulate the condition through the CFD technology, giving the result of the simulation and providing the figure to show the constructer and character of the flow field. This design is based on the N-S equation﹑standard k-epsilon turbulence model. Use the FLUENT to simulate the kind of SDR. Before simulation we must set up a model first, mesh the model afterwards and then have numerical analysis. The paper analyzed the result of the design point and non-design point, researched the front﹑the lip﹑the interior and the back of the air inlet. We looked into the interaction between the shock wave and the boundary layer also. In the same time we did some research about angle attack and compression ratio. The results showed:1. Under the design point, the total pressure recovery coefficient is satisfied with the design, the mass flow at the outlet is a little lower and the outflow is basically fluent; 2.In the condition of non-considered the body of the bomb, the total pressure recovery coefficient and mass flow rate increased; 3.We have equality compression to the bomb, the total pressure recovery and mass flow rate decreased, it's coefficient with the theoretical value; 4. In the end, the papers analyze the angular rigidity and strength using the ANSYS. The results indicate that the air inlet can work steadily under the load of pressure.The investigation described in the paper may contribute to the development of internal flow study in SDR. The result is not only conducive to understand the mechanism of internal flow, but also available for reference to the design or study on deposition of SDR.