期刊
ACTA ASTRONAUTICA
卷 108, 期 -, 页码 119-128出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actaastro.2014.12.008
关键词
Large eddy simulation; Scramjet; Dual cavity; Supersonic combustion
资金
- National Natural Science Foundation of China [51406232]
- Fok Ying Tung Education Foundation [131055]
Large eddy simulation (LES) has been carried out to investigate a hydrogen-fueled scramjet combustor with dual cavity, where a Reynolds-Averaged Navier-Stokes (RANS) model is used for near-wall treatment. The recycling/rescaling method is adopted to generate unsteady turbulent inflow conditions for the LES. Experimentally-observed flow and combustion structures are reasonably well captured and explained by the simulation. The results show that the intersection of the bow shock waves and the concentrated heat release generate a high-pressure region between the cavities, which induces great pressure gradients as well as evident flows in the transverse direction, pushing the fuel jets towards the combustor walls. Consequently, strong interactions occur between the fuel jets and the cavity aft walls, promoting the fuel transport into the cavity. Meanwhile, the cavity recirculation regions are considerably extended and distorted, and the mass exchange between the fluids in and out of the cavities may be greatly enhanced. In contrary, these flow structures support the concentrated heat release around the cavity by enhancing the fuel-air mixing and increasing the residence time of the combustible. Then, a positive feedback loop is formed by this close coupling of flow and heat release. It is also observed that the combustion downstream of the cavity is confined within narrow regions near the combustor walls due to the decreased fuel jet penetration in the farfleld. (C) 2014 IAA. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据