Effect of Added Struts and Intake Velocity on Flame Stabilization in Supersonic Combustors

  • Akram Mohammad King Abdulaziz University
Keywords: Supersonic combustion, Scramjets, Struts, Hydrogen

Abstract

In the present computational study, the impact of strut positions and the effect of inlet Mach numbers on the combustion efficiency are investigated in a strut-based supersonic combustor. An experimentally investigated model combustor developed at the German Aerospace Center (DLR) is simulated and validated. Then, a model combustor with three struts placed at different positions is investigated. Two-dimensional, compressible, reacting-flow governing equations are solved along with single step chemistry reaction and k-ω SST turbulence model using a commercial CFD code FLUENT. The oblique shock from the struts has a profound influence on the mixing and combustion process. The H2O mole fraction, H2 mole fraction contours, and combustion efficiency of various configurations are compared for finding better mixing and flame stabilization. The combustion efficiency reduces when the two struts are located in farther downstream or placed at the same downstream location. At higher Mach numbers the combustion is delayed, and the mixing of fuel with the supersonic mainstream is incomplete.

References

ANSYS Fluent - CFD Software (no date). Available at: http://www.ansys.com/Products/Fluids/ANSYS-Fluent.

Bao, W., Yang, Q., Chang, J., Zong, Y. and Hu, J. (2013) ‘Dynamic Characteristics of Combustion Mode Transitions in a Strut-Based Scramjet Combustor Model’, Journal of Propulsion and Power. American Institute of Aeronautics and Astronautics, 29(5), pp. 1244–1248. doi: 10.2514/1.B34921.

Baurle, R. and Gruber, M. (1998) ‘A study of recessed cavity flowfields for supersonic combustion applications’, in 36th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.1998-938.

Ben-Yakar, A. and Hanson, R. (1998) ‘Cavity flameholders for ignition and flame stabilization in scramjets - Review and experimental study’, in 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.1998-3122.

Choi, J.-Y., Ma, F. and Yang, V. (2005) ‘Combustion oscillations in a scramjet engine combustor with transverse fuel injection’, Proceedings of the Combustion Institute, 30, pp. 2851–2858. doi: 10.1016/j.proci.2004.08.250.

Deepu, M., Gokhale, S. S. and Jayaraj, S. (2007) ‘Numerical Modelling of Scramjet Combustor’, 57(4), pp. 367–379. doi: 10.14429/dsj.57.1784.

Gerlinger, P., Stoll, P., Kindler, M., Schneider, F. and Aigner, M. (2008) ‘Numerical investigation of mixing and combustion enhancement in supersonic combustors by strut induced streamwise vorticity’, Aerospace Science and Technology, 12, pp. 159–168. doi: 10.1016/j.ast.2007.04.003.

Grady, N., Pitz, R. W., Carter, C. D., Hsu, K.-Y., Godke, C. and Menon, S. (2012) ‘Supersonic Flow over a Ramped-Wall Cavity Flame Holder with an Upstream Strut’, Journal of Propulsion and Power, 28(5), pp. 982–990. doi: 10.2514/1.B34394.

Ground, C. R., Vergine, F., Maddalena, L. and Viti, V. (2014) ‘Experimental and Numerical Investigation of the Flow Characteristics of a Strut Injector for Scramjets’, in 19th AIAA International Space Planes and Hypersonic Systems and Technologies Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2014-3217.

Gruber, M. R., Nejad, A. S., Chen, T. H. and Dutton, J. C. (2000) ‘Transverse Injection from Circular and Elliptic Nozzles into a Supersonic Crossflow’, Journal of Propulsion and Power, 16(3), pp. 449–457. doi: 10.2514/2.5609.

Hariharan, V., Velamati, R. K. and Prathap, C. (2016) ‘Investigation on supersonic combustion of hydrogen with variation of combustor inlet conditions’, International Journal of Hydrogen Energy, 41(13), pp. 5833–5841. doi: 10.1016/j.ijhydene.2016.02.054.

Hönig, R., Theisen, D., Fink, R., Lachner, R., Kappler, G., Rist, D. and Andresen, P. (1996) ‘Experimental investigation of a SCRAMJET model combustor with injection through a swept ramp using laser-induced fluorescence with tunable excimer lasers’, Symposium (International) on Combustion, 26(2), pp. 2949–2956. doi: 10.1016/S0082-0784(96)80137-8.

Hsu, K.-Y., Carter, C., Gruber, M. and Tam, C.-J. (2009) ‘Mixing Study of Strut Injectors in Supersonic Flows’, in 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2009-5226.

Hu, J., Chang, J., Bao, W., Yang, Q. and Wen, J. (2014) ‘Experimental study of a flush wall scramjet combustor equipped with strut/wall fuel injection’. doi: 10.1016/j.actaastro.2014.07.012.

Huang, W., Qin, H., Luo, S. and Wang, Z. (2010) ‘Research status of key techniques for shock-induced combustion ramjet (shcramjet) engine’, Science in China Series E: Technological Sciences. SP Science in China Press, 53(1), pp. 220–226. doi: 10.1007/s11431-009-0379-7.

Huang, W., Wang, Z., Luo, S. and Liu, J. (2011) ‘Parametric effects on the combustion flow field of a typical strut-based scramjet combustor’, Chinese Science Bulletin. SP Science China Press, 56(35), pp. 3871–3877. doi: 10.1007/s11434-011-4823-2.

Huang, W., Yang, J. and Yan, L. (2013) ‘Multi-objective design optimization of the transverse gaseous jet in supersonic flows’, Acta Astronautica, 93, pp. 13–22. doi: 10.1016/j.actaastro.2013.06.027.

Huang, Z., He, G., Qin, F. and Wei, X. (2015) ‘Large eddy simulation of flame structure and combustion mode in a hydrogen fueled supersonic combustor’, International Journal of Hydrogen Energy. Pergamon, 40(31), pp. 9815–9824. doi: 10.1016/J.IJHYDENE.2015.06.011.

Jeong, E., Jeung, I.-S., O’Byrne, S. and P. Houwing, A. F. (2008) ‘Investigation of Supersonic Combustion with Angled Injection in a Cavity-Based Combustor’, Journal of Propulsion and Power, 24(6), pp. 1258–1268. doi: 10.2514/1.36519.

Jianwen, X. and Jialing, L. (2017) ‘APPLICATION OF FLAMELET MODEL FOR THE NUMERICAL SIMULATION OF TURBULENT COMBUSTION IN SCRAMJET’. Available at: http://www.itam.nsc.ru/tmp/Test/6/Jianwen.pdf.

Karagozian, A. R. (2010) ‘Transverse jets and their control’, Progress in Energy and Combustion Science, 36, pp. 531–553. doi: 10.1016/j.pecs.2010.01.001.

Kumar, S., Das, S. and Sheelam, S. (2014) ‘Application of CFD and the Kriging method for optimizing the performance of a generic scramjet combustor’, Acta Astronautica, 101, pp. 111–119. doi: 10.1016/j.actaastro.2014.04.003.

Kumaran, K. and Babu, V. (2009a) ‘A comparison of numerical predictions of supersonic combustion of hydrogen using different chemistry models in a model combustor’, 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 8(8), pp. 475–481. doi: 10.1504/PCFD.2009.027765.

Kumaran, K. and Babu, V. (2009b) ‘Investigation of the effect of chemistry models on the numerical predictions of the supersonic combustion of hydrogen’, Combustion and Flame, 156, pp. 826–841. doi: 10.1016/j.combustflame.2009.01.008.

Lee, K., Kang, S., Lee, Y., Cha, B. and Choi, B. (2013) ‘Effects of Fuel Injectors and Cavity Configurations on Supersonic Combustion’, Journal of Propulsion and Power, 29(5), pp. 1052–1063. doi: 10.2514/1.B34827.

Mudford, N., Mulreany, P., McGuire, J., Odam, J., Boyce, R. and Paull, A. (2003) ‘CFD Calculations for Intake-Injection Shock-Induced-Combustion Scramjet Flight Experiments’, in 12th AIAA International Space Planes and Hypersonic Systems and Technologies. Reston, Virigina: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2003-7034.

Oevermann, M. (2000) ‘Numerical investigation of turbulent hydrogen combustion in a SCRAMJET using flamelet modeling’, Aerospace Science and Technology, 4(7), pp. 463–480. doi: 10.1016/S1270-9638(00)01070-1.

Qin, F., Huang, Z., He, G., Wang, S., Wei, X. and Liu, B. (2017) ‘Flame stabilization mechanism study in a hydrogen-fueled model supersonic combustor under different air inflow conditions’, International Journal of Hydrogen Energy. Pergamon, 42(33), pp. 21360–21370. doi: 10.1016/J.IJHYDENE.2017.06.237.

Rust, B., Gerlinger, P. and Aigner, M. (2010) ‘An Improved Lobed Strut Injector Concept for Supersonic Combustion’, in 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2010-6962.

Segal, C. (2009) The scramjet engine : processes and characteristics. Cambridge University Press.

Shekarian, A. A., Tabejamaat, S. and Shoraka, Y. (2014) ‘Effects of incident shock wave on mixing and flame holding of hydrogen in supersonic air flow’, International Journal of Hydrogen Energy, 39, pp. 10284–10292. doi: 10.1016/j.ijhydene.2014.04.154.

Tomioka, S., Murakami, A., Kudo, K. and Mitani, T. (2001) ‘Combustion Tests of a Staged Supersonic Combustor with a Strut’, Journal of Propulsion and Power, 17(2), pp. 293–300. doi: 10.2514/2.5741.

Vergine, F., Maddalena, L., Miller, V. and Gamba, M. (2012) ‘Supersonic Combustion and Flame-Holding Characteristics of Pylon Injected Hydrogen in a Mach 2.4 High Enthalpy Flow’, in 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2012-333.

Zhang, C., Chang, J., Zhang, Y., Wang, Y. and Bao, W. (2017) Flow field Characteristics Analysis and Combustion Modes Classification for a Strut/Cavity Dual-Mode Combustor Flow field Characteristics Analysis and Combustion Modes Classification for a Strut/Cavity Dual-Mode Combustor’, Acta Astronautica. doi: 10.1016/j.actaastro.2017.03.023.

Zhao, Y., Liang, J. and Zhao, Y. (2016) ‘Non-reacting flow visualization of supersonic combustor based on cavity and cavity-strut flameholder’, Acta Astronautica. Elsevier, 121, pp. 282–291. doi: 10.1016/j.actaastro.2015.12.040.

Zou, J., Zheng, Y. and Liu, O. (2007) ‘Simulation of turbulent combustion in DLR Scramjet’, Journal of Zhejiang University-SCIENCE A, 8(7), pp. 1053–1058. doi: 10.1631/jzus.2007.A1053.

Published
2021-02-23
Section
Mechanical Engineering (1)