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Ignition, flame structure and near-wall burning in transverse hydrogen jets in supersonic crossflow

Published online by Cambridge University Press:  03 September 2015

Mirko Gamba  and
M. Godfrey Mungal
Mirko Gamba*
Affiliation:
Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USA
M. Godfrey Mungal
Affiliation:
Mechanical Engineering Department, Stanford University, Stanford, CA 94305, USA School of Engineering, Santa Clara University, Santa Clara, CA 95053, USA
*
†Email address for correspondence: [email protected]
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Abstract

We have investigated the properties of transverse sonic hydrogen jets in high-temperature supersonic crossflow at jet-to-crossflow momentum flux ratios $J$ between 0.3 and 5.0. The crossflow was held fixed at a Mach number of 2.4, 1400 K and 40 kPa. Schlieren and $\text{OH}^{\ast }$ chemiluminescence imaging were used to investigate the global flame structure, penetration and ignition points; $\text{OH}$ planar laser-induced fluorescence imaging over several planes was used to investigate the instantaneous reaction zone. It is found that $J$ indirectly controls many of the combustion processes. Two regimes for low (${<}1$) and high (${>}3$) $J$ are identified. At low $J$, the flame is lifted and stabilizes in the wake close to the wall possibly by autoignition after some partial premixing occurs; most of the heat release occurs at the wall in regions where $\text{OH}$ occurs over broad regions. At high $J$, the flame is anchored at the upstream recirculation region and remains attached to the wall within the boundary layer where $\text{OH}$ remains distributed over broad regions; a strong reacting shear layer exists where the flame is organized in thin layers. Stabilization occurs in the upstream recirculation region that forms as a consequence of the strong interaction between the bow shock, the jet and the boundary layer. In general, this interaction – which indirectly depends on $J$ because it controls the jet penetration – dominates the fluid dynamic processes and thus stabilization. As a result, the flow field may be characterized by a flame structure characteristic of multiple interacting combustion regimes, from (non-premixed) flamelets to (partially premixed) distributed reaction zones, thus requiring a description based on a multi-regime combustion formulation.

JFM classification

Reacting Flows: Turbulent reacting flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 780 , 10 October 2015 , pp. 226 - 273
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© 2015 Cambridge University Press 

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