Statistical Analysis of the Reaction Progress Variable and Mixture Fraction Gradients in Flames Propagating into Droplet Mist: A Direct Numerical Simulation Analysis
| Autor: | Nilanjan Chakraborty, Daniel H. Wacks |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Turbulence General Chemical Engineering Mist Evaporation Mode (statistics) Direct numerical simulation General Physics and Astronomy Energy Engineering and Power Technology Thermodynamics Probability density function 02 engineering and technology General Chemistry Mechanics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Fuel Technology 020401 chemical engineering Joint probability distribution Phase (matter) 0103 physical sciences Physics::Chemical Physics 0204 chemical engineering |
| Zdroj: | Combustion Science and Technology. 188:2149-2177 |
| ISSN: | 1563-521X 0010-2202 |
| DOI: | 10.1080/00102202.2016.1212605 |
| Popis: | The statistics of reaction progress variable, , and mixture fraction, , and their gradients (i.e., and ) in flames propagating in droplet mist, where the fuel was supplied in the form of monodisperse droplets, have been analyzed for different values of turbulent velocity fluctuations (), droplet equivalence ratios (, and droplet diameters ( based on three-dimensional direct numerical simulations (DNS) in a canonical configuration under decaying turbulence. The combustion process in the gaseous phase has been found to take place predominantly in fuel-lean mode, even for . The probability of finding fuel-lean mixture increases with increasing initial droplet diameter due to slower evaporation of larger droplets. It has been shown that the joint probability density function (i.e., joint PDF) of and (i.e., ), cannot be approximated in terms of discrete delta functions throughout the flame brush for the cases considered here. Furthermore, the magnitude of cannot be adequately approximated by the produc... |
| Databáze: | OpenAIRE |
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