Combustion, Explosion, and Shock Waves

, Volume 45, Issue 3, pp 237–244 | Cite as

Characteristics of the boundary layer with hydrogen combustion with variations of thermal conditions on a permeable wall

  • É. P. Volchkov
  • V. V. Terekhov
  • V. I. Terekhov


The paper describes a numerical study of the influence of thermal and boundary conditions on the structure of laminar and turbulent diffusion flames in the cases with hydrogen injection through a porous surface and with hydrogen combustion in an air flow. Two types of boundary conditions are compared: with a given constant temperature T w = const over the length of the porous surface for arbitrary intensities of fuel injection and with a constant temperature T′ = const of the fuel injected through the porous wall. The first case occurs during combustion of a liquid fuel whose burning surface temperature remains unchanged. Injection of gaseous fuel usually leads to the second case with T′ = const. Despite significant differences in velocity and temperature profiles, the skin friction coefficients in the laminar flow are close to each other in these two regimes. In the turbulent regime, the effect of the thermal boundary conditions on friction and heat transfer is more pronounced. Moreover, the heat flux to the wall as a function of fuel-injection intensity is characterized by a clearly expressed maximum. A principal difference of the effect of combustion on friction and heat transfer in the laminar and turbulent flow regimes is demonstrated.

Key words

boundary layer porous injection combustion skin friction heat and mass transfer boundary conditions 


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Copyright information

© MAIK/Nauka 2009

Authors and Affiliations

  • É. P. Volchkov
    • 1
  • V. V. Terekhov
    • 1
  • V. I. Terekhov
    • 1
  1. 1.Kutateladze Institute of Thermophysics, Siberian DivisionRussian Academy of SciencesNovosibirskRussia

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