thesis.pdf (26.62 MB)
0/0

LES of transient premixed flames using a dynamic flame surface density model

Download (26.62 MB)
thesis
posted on 21.10.2019 by Ruipengyu Li
Transient premixed flames are significant in areas such as spark-ignition engines and gas explosions. However, physical understanding and accurate prediction remain challenging due to the fact that the flame typically transits from early quasi-laminar to fully turbulent, and the interactions with the surrounding solid structures often lead to the continuous stretching of the flame front. This study has considered the large eddy simulation (LES) techniques for the simulations of transient turbulent premixed flames. The LES technique has evolved as a powerful computational tool for the prediction of unsteady flame propagation. The difficulty of applying LES for turbulent premixed combustion is to account for the thin flame front using appropriate methods. This thesis considers a dynamic flame surface density (DFSD) model to close the filtered reaction rate. It automatically computes the model parameter based on the characteristics of the resolved flame front. The model is first validated in a one-dimensional laminar case to ensure the correct behaviours including the filtered flame thickness and laminar burning velocity with the absence of sub-grid turbulence. [Continues.]

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Publisher

Loughborough University

Rights holder

© Ruipengyu Li

Publication date

2018

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of the degree of Doctor of Philosophy of Loughborough University.

Language

en

Supervisor(s)

Weeratunge Malalasekera ; Salah Ibrahim

Qualification name

PhD

This submission includes a signed certificate in addition to the thesis file(s)

I have submitted a signed certificate

Exports