3-D Numerical Simulation for Ramjet using an efficient Multi-Code CFD Solver
- Paper ID
1202
- author
- company
- country
China
- year
2008
- abstract
For the integrated air-breathing engines, such as ramjet and scramjet, all the components are coupled to each other strongly in aerodynamic aspect. To thoroughly understand the coupling mechanisms, it’s very important to efficiently simulate the integrated flowfield in the engines. This is also valuable for the precision-design of the engine. In this paper, an efficient multi-code CFD solver which was developed by us is used to simulate the 3-D integrated flows in a ramjet air-breathing engine in a loosely coupled manner. That is, a multiblock, multigrid, single-species, turbulence flow solver is used to simulate the flows in the inlet, while a multi-species one to simulate the flows in the combustor and nozzle. They are loosely coupled on the inlet-combustor interface. The flow properties exchange mechanism of the two solvers across the interface is carefully constructed so that the main information of the flowfield can be conserved. The k-$\varepsilon$ two-equation turbulence model is used in the NS calculation. The engine investigated in this study is a typical ramjet which consisted of a 2-D rectangular mixed compression supersonic inlet and a axisymmetric dump combustor. The fuel used in the present study is kerosene, and a single-step reaction mechanism is employed to describe its combustion process with air. The multi-code solver is successfully used to calculate the 3-D integrated flowfield. Numerical results show that the flow properties change smoothly across the inlet-engine interface. To compare the efficiency of the multi-code method with the traditional method, a multi-species module was used to simulate the whole flow field in the ramjet and the results show that the multi-code method is more efficient for the engine integrated flowfield simulation, while the simulation precision is satisfactory.