منابع مشابه
Characteristics of Turbulent Nonpremixed Jet-flames and Jet-flames in Crossflow in Normal- and Low-gravity
It is well known that buoyancy has a major influence on the flow structure of turbulent nonpremixed jet flames. For example, previous studies have shown that transitional and turbulent jet flames exhibit flame lengths that are as much as a factor of two longer in microgravity than in normal gravity. The objective of this study is to extend these previous studies by investigating both mean and f...
متن کاملPreferential Diffusion Effects on the Burning Rate of Interacting Turbulent Premixed Hydrogen-Air Flames
The upstream interaction of twin premixed hydrogen-air flames in 2-D turbulence is studied using direct numerical simulations with detailed chemistry. The primary objective is to determine the effect of flame stretch on the overall burning rate during various stages of the interaction. Preferential diffusion effects are accounted for by varying the equivalence ratio from symmetric rich-rich to ...
متن کاملPrediction of turbulent heat transfer in impinging jet geometries
This chapter summarizes the current knowledge on the numerical prediction of turbulent impinging jet flows. The predictive capabilities of numerical models are evaluated by careful comparison with experimental fluid flow and heat transfer data. Turbulent fluctuations in the velocity field are mathematically modelled using the Reynolds Averaged Navier–Stokes (RANS) methodology. Turbulence is ass...
متن کاملImpact of Turbulence Intensity and Equivalence Ratio on the Burning Rate of Premixed Methane–Air Flames
Direct Numerical Simulations (DNS) have been conducted to study the response of initially laminar spherical premixed methane–air flame kernels to successively higher turbulence intensities at five different equivalence ratios. The numerical experiments include a 16-species/25-step skeletal mechanism for methane oxidation and a multicomponent molecular transport model. Highly turbulent condition...
متن کاملReaction-rate, Mixture-fraction, and Temperature Imaging in Turbulent Methane/air Jet Flames
Instantaneous two-dimensional measurements of reaction rate, mixture fraction, and temperature are demonstrated in turbulent partially premixed methane/air jet flames. The forward reaction rate of the reaction CO OH ⇒ CO2 H is measured by simultaneous OH laser-induced fluorescence (LIF) and two-photon CO LIF. The product of the two LIF signals is shown to be proportional to the reaction rate. T...
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ژورنال
عنوان ژورنال: Journal of Combustion
سال: 2011
ISSN: 2090-1968,2090-1976
DOI: 10.1155/2011/737914