Numerical Investigation on Flame Stabilization in DLR Hydrogen Supersonic Combustor with Strut Injection

ABSTRACT

Flame stabilization in the DLR hydrogen supersonic combustor with strut injection was numerically investigated by using an in-house large eddy simulation code developed on the OpenFoam platform. To facilitate the comparison and analysis of various hydrogen oxidation mechanisms with different levels of mechanism reduction, the proposed 2D calculation model was validated against both the 3D simulation and the experimental data. The results show that the 2D model can capture the DLR flow and combustion characteristics with satisfactorily quantitative accuracy and significantly less computational load. By virtue of the flow visualization and the analyses of species evolution and heat release, the supersonic combustion in the DLR combustor can be divided into three stages along the streamwise direction: the induction stage where ignition occurs and active radicals are produced, the transition stage through which radicals are advected to the downstream, and the intense combustion stage where most heat release occurs. Furthermore, the sensitivity analysis of key reaction steps identifies the important role of chain carrying and heat release reactions in numerically reproducing the three-stage combustion stabilization mode in the DLR combustor.

KEYWORDS:

• Detailed hydrogen oxidation mechanism
• DLR
• Flame stabilization
• Sensitivity analysis
• Supersonic combustion

Supplemental Data

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Acknowledgment

The authors are grateful to the National Supercomputer Centre in Tianjin for computational resource.

Funding

The work at the Hong Kong Polytechnic University was supported by the Hong Kong RGC/GRF (PloyU 152651/16E) and in part by the SRFDP & RGC ERG Joint Research Scheme (M-PolyU509/13), while work at the Institute of Mechanics was supported by the National Natural Science Foundation of China (Grant No. 11502270) and Training Program of the Major Research Plan of the National Natural Science Foundation of China (Grant No. 91641110).

Additional information

Funding

The work at the Hong Kong Polytechnic University was supported by the Hong Kong RGC/GRF (PloyU 152651/16E) and in part by the SRFDP & RGC ERG Joint Research Scheme (M-PolyU509/13), while work at the Institute of Mechanics was supported by the National Natural Science Foundation of China (Grant No. 11502270) and Training Program of the Major Research Plan of the National Natural Science Foundation of China (Grant No. 91641110).