Steady and unsteady flow characteristics of dual cavity in strut injection scramjet combustor |
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| Affiliation: | 1. Mechanical Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, India, 626126;2. Mechanical Engineering, METU University, Ankara, Turkey;3. Aerospace Engineering, METU University, Ankara, Turkey;1. Department of Mechanical Engineering, Middle East Technical University, 06800, Ankara, Türkiye;2. Department of Aerospace Engineering, Middle East Technical University, 06800, Ankara, Türkiye;3. Department of Physics, Middle East Technical University, 06800, Ankara, Türkiye;4. TÜBİTAK, Marmara Research Center, Gebze, Kocaeli, Türkiye;5. CNRS-ICARE, Orléans, France;1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, 410073, China;2. College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China;1. School of Automation, Central South University, Changsha 410083, China;2. Research Institute of Aerospace Technology, Central South University, Changsha 410083, China;1. Southwest University of Science and Technology, Mianyang 621000, China;2. Science and Technology on Scramjet Laboratory, China Aerodynamic Research and Development Center, Mianyang 621000, China;1. CFD Center, Aeronautical Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, India;2. Mechanical Engineering, Middle East Technical University, Ankara, Turkey;3. Aerospace Engineering, Middle East Technical University, Ankara, Turkey;4. School of Mechanical Engineering, VIT University, Chennai, India |
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| Abstract: | This study aims to understand the flow performance of a dual wall-mounted cavities in a strut-injector mounted scramjet combustor for steady-state and transient reacting conditions. Conventionally, two-dimensional Reynolds Averaged Navier-Stokes approach is adopted to compute the steady flow, whereas the current research employs Delayed Detached Eddy Simulation for predicting the unsteady flow characteristics as well. The calculated flow patterns, density, pressure, and temperature fields of dual cavities are compared with shadowgraph and wall pressure measurements from DLR experiments. The dual cavities position substantiates to explore the interplay between wave propagation and shear layer mixing characteristics. Employing a dual cavities arrangement accelerates toward the complete combustion relative to the baseline model. The combustion zone widens in the lateral direction as the dual cavities shift the shock train downstream of the strut injector owing to intense shock shear layer interactions. These cavities' existence significantly modifies the dominating frequencies and affects the strength of the diverging section's coherent flow structures. |
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| Keywords: | Scramjet Strut injection Cavity flow Dual cavities Combustion efficiency Dynamic mode decomposition |
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