@article{QIAO2026, 
author = {Hongwei QIAO and Lin ZHANG and Jianhan LIANG and Junjun GUO and Hong G. IM and Qingdi GUAN and Jiaoru WANG},
title = {Numerical investigation on flame development and oscillations in strut-based supersonic combustor},
year = {2026},
journal = {Chinese Journal of Aeronautics},
volume = {39},
number = {7},
keywords = {Combustion oscillation, Flame stabilization, Large eddy simulation, Scramjet, Supersonic combustion},
url = {https://www.sciopen.com/article/10.1016/j.cja.2025.104053},
doi = {10.1016/j.cja.2025.104053},
abstract = {To achieve sustainable combustion in scramjets, struts or cavities are typically introduced as flame holders, but they also contribute to complex combustion instabilities. This study employs a hybrid Large Eddy Simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) technique to investigate the German Aerospace Center’s (DLR) strut-based supersonic combustor, providing detailed insights into the combustion processes with a focus on the near-field flame development and overall combustion oscillations within the combustor. The high-resolution simulation reveals that two pairs of recirculation zones emerge behind the strut. The expansion of the main recirculation zone induces a forward movement of the high-temperature region, triggering auto-ignition and causing a flame reverse movement phenomenon. The interaction between turbulence and chemical reactions results in two types of reverse flame movement in the near-field region, collectively forming a complex flame-switching behavior to induce upstream combustion oscillations. The pressure oscillation frequencies in the near- and far-field regions are essentially identical and exhibit strong cross-correlation characteristics, suggesting a potential influence of near-field combustion oscillations on the far-field combustion oscillations.}
}