Details of Grant 

EPSRC Reference:	GR/T19650/01
Title:	Modelling extinction & re-ignition in turbulent non-premixed flames
Principal Investigator:	Kronenburg, Professor A
Other Investigators:
Researcher Co-Investigators:
Project Partners:	Sandia National Laboratory
Department:	Mechanical Engineering
Organisation:	Imperial College London
Scheme:	Standard Research (Pre-FEC)
Starts:	01 February 2005	Ends:	31 January 2008	Value (£):	169,632
EPSRC Research Topic Classifications:	Combustion
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:
Panel History:	Panel Date Panel Name Outcome 09 Jun 2004 Engineering Science (Flow) Panel Deferred
Summary on Grant Application Form
Conditional Moment Closure (CMC) methods are among the most promising combustion sub-models that are based on sound theoretical derivations with a high degree of universality. However, singly conditioned, first order CMC is not capable of accurately predicting species concentrations in the presence of local extinction and re-ignition and either second order closures or double conditioning can be used to compensate for these shortcomings. Recent studies using second order CMC have led to some promising results, but all suggested models lack some degree of universality and are cumbersome to use in the presence of real multi-step chemistry. The aim of the present study is to develop a formal CMC modelling framework based on double conditioning of species concentrations on mixture fraction and sensible enthalpy. This new approach will be assessed using Direct Numerical Simulation (DNS) with multi-step chemistry. DNS will aid the developing process of unclosed terms such as doubly conditioned scalar dissipation and dissipation of the progress variable. In a further step, modelling strategies and closures will be extended to various turbulent hydrocarbon-air diffusion flames with progressive rates of extinction (Sandia Flames D-F). Measurements of scalar gradients are available and a more complete set of measurements will be conducted in the near future at Sandia. The measurements will constitute ideal test data for the validation of possible closures. Finally, fully closed doubly conditioned CMC will be applied to Sandia flames D-F and simulations will be compared to experimental data.
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Organisation Website:	http://www.imperial.ac.uk