Results 221 to 230 of about 1,020 (262)
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Investigation of a Turbulent Flame Speed Closure Approach for Premixed Flame Calculations
Combustion Science and Technology, 2000Abstract A computational model for turbulent premixed gaseous combustion is investigated, where the combustion process is modelled in terms of a single transport equation for a reaction progress variable c. Turbulent closure of the source term of the progress variable is based on a model, where the turbulent flame speed is used in an extension to a ...
Friedrich Dinkelacker
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Turbulence Effects on Flame Speed and Flame Structure
AIAA Journal, 1979Turbulence effects on methane-air flames stabilized in grid turbulence were investigated through measurements of flame speed and mean and fluctuating flame temperature profiles. Published turbulent flame speed correlations were able to correlate the experimental flame speed data but were contradictory in indicating flame structure and combustion ...
K. SMITH, F. GOULDIN
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Compressible turbulent flame speeds of highly turbulent standing flames
Proceedings of the Combustion Institute, 2019Abstract In this paper we present the first measurement of turbulent burning velocities of a highly turbulent compressible standing flame induced by shock-driven turbulence in a Turbulent Shock Tube. High-speed schlieren, chemiluminescence, PIV, and dynamic pressure measurements are made to quantify flame–turbulence interaction for high levels of ...
Jonathan Sosa +4 more
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Evolution of local flame displacement speeds in turbulence
Journal of Fluid Mechanics, 2019Himanshu L. Dave, Swetaprovo Chaudhuri
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Turbulent Flame Speeds of Premixed Supersonic Flame Kernels
Flow, Turbulence and Combustion, 2018It is unclear whether turbulent flame speed scalings established in low speed regimes are applicable to supersonic flames. To investigate this question, the canonical flame kernel is investigated in a scramjet-like channel having a one degree wall divergence. The growth, shape and internal kernel dynamics are investigated.
Bradley A. Ochs +3 more
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Flame Speed and Self-Similar Propagation of Expanding Turbulent Premixed Flames
Physical Review Letters, 2012In this Letter we present turbulent flame speeds and their scaling from experimental measurements on constant-pressure, unity Lewis number expanding turbulent flames, propagating in nearly homogeneous isotropic turbulence in a dual-chamber, fan-stirred vessel.
Swetaprovo, Chaudhuri +3 more
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Volume 2: Turbo Expo 2005, 2005
The present experimental study focuses on flame characteristics and turbulent flame speeds of lean premixed flames typical for stationary gas turbines. Measurements were performed in a generic combustor at a preheating temperature of 673 K, pressures up to 14.4 bars (absolute), a bulk velocity of 40 m/s, and an equivalence ratio in the range of 0.43–0 ...
Griebel, P. +5 more
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The present experimental study focuses on flame characteristics and turbulent flame speeds of lean premixed flames typical for stationary gas turbines. Measurements were performed in a generic combustor at a preheating temperature of 673 K, pressures up to 14.4 bars (absolute), a bulk velocity of 40 m/s, and an equivalence ratio in the range of 0.43–0 ...
Griebel, P. +5 more
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Flame speed characteristics of turbulent expanding flames in a rectangular channel
Combustion and Flame, 2019Abstract We present results from studies of freely expanding flames in a unique small-scale convective facility for different free-stream initial conditions, characterized by Taylor-Reynolds numbers in the range of R e λ g = 179 − 395 (using the streamwise RMS velocity component and the lateral Taylor-microscale) and an inertial ...
Dan Fries +4 more
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The Turbulent Flame Speed of Premixed Spherically Expanding Flames
2017Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field.
G. K. Giannakopoulos +3 more
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51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2013
T eff S has an inverse dependence upon the instantaneous, ensemble averaged flame curvature, an effect that scales with turbulence intensity and harmonic excitation amplitude. We show that this curvature dependence follows from basic application of Huygens propagation to flames with stochastic wrinkling superposed upon base curvature.
Dong-hyuk Shin, Tim Lieuwen
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T eff S has an inverse dependence upon the instantaneous, ensemble averaged flame curvature, an effect that scales with turbulence intensity and harmonic excitation amplitude. We show that this curvature dependence follows from basic application of Huygens propagation to flames with stochastic wrinkling superposed upon base curvature.
Dong-hyuk Shin, Tim Lieuwen
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