Controlled detonation initiation in hypersonic flow |
| |
Authors: | Jonathan Sosa Daniel A. Rosato Gabriel B. Goodwin Christian L. Bachman Elaine S. Oran Kareem A. Ahmed |
| |
Affiliation: | 1. Center for Advanced Turbomachinery & Energy Research, Department of Mechanical and Aerospace Engineering, University of Central Florida, 12760 Pegasus Blvd, P.O. Box 162450, Orlando, FL 32816-2450, USA;2. Naval Center for Space Technology, U.S. Naval Research Laboratory, Washington, DC 20003, USA;3. Department of Aerospace Engineering, Texas A&M University, College Station, TX 77843, USA |
| |
Abstract: | Experimental evidence of controlled detonation initiation and propagation in a hypersonic flow of premixed hydrogen-air is presented. This controlled detonation initiation is created in a hypersonic facility capable of producing a Mach 5 flow of hydrogen-air. Flow diagnostics such as high-speed schlieren and OH* chemiluminescence results show that a flame deflagration-to-detonation transition occurs as a combined result of turbulent flame acceleration and shock-focusing. The experimental results define three new distinct regimes in a Mach 5 premixed flow: deflagration-to-detonation transition (DDT), unsteady compressible turbulent flames, and shock-induced combustion. A two-dimensional implicit-LES (ILES) simulation, which solves the compressible, reactive Navier-Stokes equations on an adapting grid is conducted to provide additional insight into the local physical mechanism of detonation transition and propagation. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|