Large eddy simulation based studies of jet–cavity interactions in a supersonic flow |
| |
| Institution: | 1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China;2. Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, England, UK;1. University of Naples Parthenope, Italy;2. University of Naples Federico II, Italy;1. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;2. The School of MACE, The University of Manchester, Manchester M13 9PL, UK;3. School of Engineering, University of Glasgow, Scotland G12 8QQ, UK;4. General Electric Aviation, Marmara Technology Center, Gebze, Kocaeli, 41471 Turkey |
| |
| Abstract: | Interactions of a cavity flameholder with an upstream injected jet in a Ma 2.52 supersonic flow are investigated numerically. A hybrid RANS/LES (Reynolds-Averaged Navier–Stokes/Large Eddy Simulation) method acting as wall-modeled LES is adopted, for which the recycling/rescaling method is introduced to treat the unsteady turbulent inflow. Patterns of the fluid entrainment into the cavity and escape from the cavity are identified using a scalar-tracing method. It is found that the jet–cavity interactions remarkably enhanced the mass exchange between the fluids in and out of the cavity, resulting in reduced residence time of the cavity fluids. Increasing the distance between the fuel injection and the cavity leading edge tends to attenuate the jet–cavity interactions, leading to weaker mass exchange. Raising the injection pressure appears to enhance the jet–cavity interactions, resulting in a shorter residence time of the cavity fluids. Moreover, the mass decay processes for the fuel and air within the cavity are basically the same while the entrainment processes for the fuel and air into the cavity seem quite different. |
| |
| Keywords: | Cavity Jet Supersonic Mass exchange |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
