Statistical behavior of fuel mass fraction variance transport in turbulent flame–droplet interaction: A direct numerical simulation analysis

Autor:	Nilanjan Chakraborty, Sean P. Malkeson, Daniel H. Wacks
Rok vydání:	2016
Předmět:	Numerical Analysis Operations research Turbulence 020209 energy Direct numerical simulation Context (language use) 02 engineering and technology Mechanics Condensed Matter Physics Combustion 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Damköhler numbers Fuel mass fraction 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Convection–diffusion equation Reynolds-averaged Navier–Stokes equations Mathematics
Zdroj:	Numerical Heat Transfer, Part A: Applications. 70:1087-1100
ISSN:	1521-0634 1040-7782
DOI:	10.1080/10407782.2016.1230398
Popis:	Three-dimensional direct numerical simulations (DNS) data of statistically planar turbulent spray flames propagating into monodisperse droplets for different values of droplet diameter ad and droplet equivalence ratio ϕd have been used to analyze the statistical behavior of the fuel mass fraction variance and its transport in the context of Reynolds-averaged Navier–Stokes (RANS) simulations. The algebraic closure, which was previously derived for high Damkohler number turbulent stratified mixture combustion, has been shown not to capture statistical behavior of for turbulent spray flames, because the underlying assumptions behind the original modeling are invalid for the cases considered in this analysis. The modeling of the unclosed terms of the variance transport equation (i.e., the turbulent transport term T1, the reaction rate contribution T3, the evaporation contribution T4, and the dissipation rate term –D2) has been analyzed in the context of RANS simulations. The models previously proposed...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5ef7650d76b6078e477e9ad4a7164580 https://doi.org/10.1080/10407782.2016.1230398 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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