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Area increase and s...
Area increase and stretch factor in lean hydrogen-air turbulent flames
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- Lee, Hsu Chew (författare)
- Southern University of Science and Technology
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- Wu, B. (författare)
- Southern University of Science and Technology
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- Dai, Peng (författare)
- Southern University of Science and Technology
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- Wan, Minping (författare)
- Southern University of Science and Technology
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- Lipatnikov, Andrei, 1961 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Proceedings of the Combustion Institute. - 1540-7489. ; 40:1-4
- Relaterad länk:
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Analyzed in this paper are three-dimensional Direct Numerical Simulation (DNS) data obtained earlier by the present authors from (i) 16 statistically planar and one-dimensional, lean complex-chemistry hydrogen-air turbulent flames propagating in forced turbulence in a box and (ii) nine counterpart equidiffusive flames. The simulation conditions cover a wide range of non-dimensional turbulent combustion characteristics. Specifically, root-mean-square turbulent velocity is varied from 0.3 to 55 laminar flame speeds, integral length scale of turbulence is varied from 0.5 to 2.6 laminar flame thicknesses, Damköhler and Karlovitz number are varied from 0.01 to 5.2 and from 0.7 to 1300, respectively. Three equivalence ratios, 0.7, 0.5, and 0.35, are addressed. Results of complementary two- and three-dimensional simulations of thermodiffusively unstable laminar flames are also reported. They show that neutral wavelength of laminar flame instabilities (both hydrodynamic and thermodiffusive ones are enabled in the simulations) is smaller (larger) than computational domain wide in ten (three, respectively) cases characterized by a low Lewis number. Accordingly, in three of these cases, the instabilities are suppressed. The focus of the study is placed (i) on contributions of flame surface area increase and stretch factor to turbulent burning velocity and (ii) on the influence of differential diffusion effects on these contributions. The computed results show that the flame surface area (i) is substantially increased by both turbulent rms velocity and length scale, (ii) is turbulent velocity, but (iv) a notable influence of turbulence length scale on the stretch factor is not observed.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- premixed turbulent combusiton
- stretch factor
- Lewis number
- flame surface area
- differential diffusion
- flame speed
- thermodiffusive instability
Publikations- och innehållstyp
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- ref (ämneskategori)
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