Auto-ignition and combustion of diesel spray using unsteady laminar flamelet model

CATEGORY: COMBUSTION
Applied Thermal Engineering, Volume 52, Issue 2, 15 April 2013, Pages 420–427
Auto-ignition and combustion of diesel spray using unsteady laminar flamelet model
Isares Dhuchakallaya (a), Phadungsak Rattanadecho (a), Paul Watkins (b)
a Department of Mechanical Engineering, Thammasat University, Klong-Luang, Pathumthani 12120, Thailand
b School of Mechanical, Aerospace and Civil Engineering, University of Manchester, M13 9PL, UK
Abstract
Describes the modeling capabilities of the unsteady flamelet/reaction progress variable approach to implement diesel spray flames for capturing the auto-ignition and flame lift-off phenomena. The droplet size distribution based on the moment scheme characterizes the poly-disperse spray model employed in this work.
The flamelet progress variable solutions embedded in a Reynolds-averaged Navier–Stokes (RANS) framework, together with the probability density function (PDF) approach, signify the turbulence–chemistry interaction. All thermochemical scalars are represented as a function of mean mixture fraction, mixture fraction variance, reaction progress variable and scalar dissipation rate. Mixture fraction is assumed to follow a beta-PDF distribution, because the reaction progress variable and scalar dissipation rate distributions are assumed to be a delta-PDF. In order to assess the capability of this developed model, the predicted results are compared with experimental data. The model can accurately and efficiently capture the auto-ignition and flame lift-off phenomena of diesel spray flame.
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