Complex Charge Structure Numerical Simulation Of The Combustion Chamber Of The Flow Field

This article uses the UDF in the FLUENT software and its secondary development to simulate the simple two-dimensional motor. UDF and the dynamic meshes are uesd to established a method which include moving burning surface of solid rocket motor, and get under the burning surface changes in two-dimensional transient flow field and the corresponding numerical simulation results within the trajectory. The simulation results of UDF and dynamic grid that can be simulated the flow field very well which contain erosion effect. The propellant at the end of the motor combust charge completely,and exposed to the hot gas in a long time, at a time when changes in performance parameters, design of the engine's heat shield has some significance.Charge for three-dimensional complex flow field calculation, and using theκ-εmodel and the quasi-static and parallel assumptions to establish a method which study the three-dimensional complex flow field.It shows that the velocity and turbulent kinetic energy distribution also showed three-dimensional features. However, with the combustion chamber and nozzle front end of the junction of the middle section of gas in the convergence crashing wall, which forming a ring of gas stagnation zone. The impact of gas in the region and thermal ablation is very obvious. Because of the presence of sudden-expansion step, there has a clear spiral, and gas which has some of the energy transformed into heat energy in the vortex gradually, and strengthening the wall heat transfer. The addition of metal particles can not only improve the performance of the propellant, but also increase the combustion rate, but it will also have an impact on the flow field. The article described and analyzed the impact of the flow field on which the different time and different diameter particles. Early in the combustion, due to the small diameter with the flow is good, so in the formation of a vortex nozzle convergent section, and did not form in the expansion of grain-free zone section. Analyzed and compared the Mach number, the temperature and the turbulent energy in two different turbulent models.