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DNS Analysis of Wall Heat Transfer and Combustion Regimes in a Turbulent Non-premixed Wall-jet Flame

Pouransari, Zeinab (författare)
KTH,Mekanik
Vervisch, L. (författare)
Fuchs, Laszlo (författare)
KTH,Mekanik
visa fler...
Johansson, Arne V. (författare)
KTH,Mekanik
visa färre...
 (creator_code:org_t)
2016-02-04
2016
Engelska.
Ingår i: Flow Turbulence and Combustion. - : Springer Netherlands. - 1386-6184 .- 1573-1987. ; , s. 1-19
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Understanding the heat-release effects on the wall heat transfer in turbulent reacting flows, i.e. heat transfer with or without significant density variation, is essential for a wide variety of industrial flows, especially combustion problems. The present study focuses on the wall heat transfer and the near-wall reaction characteristics. The heat-release effects on the wall heat transfer and skin-friction coefficients are investigated using three-dimensional direct numerical simulations of a turbulent reacting wall-jet flow with and without heat release. Reductions in the skin-friction coefficient are observed in the exothermic case, compared to the isothermal one, and the underlying mechanism is explained. The absolute wall heat flux also increases, while the corresponding Nusselt number decreases with increasing heat release. Furthermore, the wall effects on the near-wall average burning rate are assessed. It is found that the isothermal cold wall results in an appreciable decrease of the burning rate in the exothermic cases. We observed indications that the wall increases the chances for the development of the premixed mode and its occurrence is very fast in the wall-normal direction.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

Direct numerical simulation
Flame index
Non-Premixed combustion
Skin friction coefficient
Turbulent wall-jet
Wall heat transfer
Combustion
Friction
Heat flux
Isotherms
Jets
Numerical models
Skin friction
Tribology
Nonpremixed combustion
Turbulent wall jet
Heat transfer

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art (ämneskategori)

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