【4/24 11:00~12:00 Keynote Speech】Simulation and Analysis of a Scramjet Combustor Assisted by a Porous Cylindrical Burner
2021 Taiwan Combustion and Energy Conference,Huwei Township, Yunlin County, Taiwan, 24 April. 2021
Simulation and Analysis of a Scramjet Combustor Assisted by a Porous Cylindrical Burner
Kuo-Long Pan
Department of Mechanical Engineering, National Taiwan University
ABSTRACT: We have performed three-dimensional simulations of flow field in the combustion chamber of a scramjet engine with liquid fuels in terms of various numerical strategies, including the open source CFD software, OpenFOAM. The fuels of test cover the gases of hydrogen and ethylene [1,2], as well as liquid n-decane, which is a surrogate of kerosene and can be used for pragmatic study of the combustor fueled by liquid hydrocarbon in sprays. The Large Eddy Simulation (LES) and the k-ω SST turbulence models have been implemented for turbulence models, respectively, and the Partially-Stirred Reactor model (PaSR) has been adopted for combustion associated with various multi-step chemical reaction mechanisms. The accuracy of numerical approach and simulation procedure have been verified against published cases; the method was then applied to reform the scramjet combustion chamber. Specifically, by adding a porous burner behind the main combustion zone downstream the fuel injector, the performance was significantly improved, including flame stabilization and enhancement of kinetic energy and thrust. Variations of some key factors have also been considered, such as the drag and flame extinction. It is demonstrated by the simulations that the combustion chamber assisted by the porous cylinder could hold flames that would otherwise be quenched at extremely low mass flowrate of hydrogen, and at a general condition of ethylene, as compared to the conventional scramjet model.
Reference:
1. Y. C. Cheng and K. L. Pan*, “Simulation and design of a scramjet combustor enhanced by a porous cylinder burner,” 2018 AIAA SciTech Forum/56th AIAA Aerospace Sciences Meeting, Paper Number: AIAA 2018-0887.
2. Wei-Shen Lee and K. L. Pan*, “Computational investigation of an ethylene-fueled supersonic combustor assisted by a porous cylindrical burner,” Aerospace Science and Technology 107, 106350 (2020).
