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Combustion, Explosion, and Shock Waves

, Volume 54, Issue 6, pp 629–641 | Cite as

Effect of the Wave Structure of the Flow in a Supersonic Combustor on Ignition and Flame Stabilization

  • M. A. Goldfeld
  • Yu. V. Zakharova
  • A. V. Fedorov
  • N. N. Fedorova
Article
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Abstract

Results of numerical and experimental investigations of a high-velocity flow in a plane channel with sudden expansion in the form of a backward-facing step, which is used for flame stabilization in a supersonic flow, are presented. The experiments are performed in the IT-302M high-enthalpy short-duration wind tunnel under the following test conditions: Mach number at the combustor entrance 2.8, Reynolds number 30 · 106 m−1, and total temperature T0 = 2000 K, i.e., close to flight conditions at M = 6. The numerical simulations are performed by solving full unsteady Reynolds-averaged Navier–Stokes equations supplemented with the kω SST turbulence model and a system of chemical kinetics including 38 forward and backward reactions of combustion of a hydrogen–air mixture. Three configurations of the backward-facing step are considered: straight step without preliminary actions on the flow, with preliminary compression, and with preliminary expansion of the flow. It is demonstrated that the backward-facing step configuration exerts a significant effect on the separation region size, pressure distribution, and temperature in the channel behind the step, which are the parameters determining self-ignition of the mixture. The computed results show that preliminary compression of the flow creates conditions for effective ignition of the mixture. As a result, it is possible to obtain ignition of a premixed hydrogen–air mixture and its stable combustion over the entire channel height.

Keywords

supersonic flow turbulence shock wave expansion wave combustor premixed mixture ignition 

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • M. A. Goldfeld
    • 1
  • Yu. V. Zakharova
    • 1
  • A. V. Fedorov
    • 1
  • N. N. Fedorova
    • 1
    • 2
  1. 1.Khristianovich Institute of Theoretical and Applied Mechanics, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  2. 2.Novosibirsk State University of Architecture and Civil Engineering (SIBSTRIN)NovosibirskRussia

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