Analysis of data to develop models for spray combustion

Clarke, Jason and Wandel, Andrew P. and Mastorakos, E. (2010) Analysis of data to develop models for spray combustion. In: 2010 Southern Region Engineering Conference (SREC 2010), 11-12 Nov 2010, Toowoomba, Australia.

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Abstract

Modern combustion systems are being designed to operate closer to the lean combustion limit in order to improve fuel economy, reduce operating noise and reduce the production of pollutants. However, this increases the chances of misfiring occurring, particularly when the fuel is injected into the combustion chamber in liquid form and heat is required to vaporise the fuel so that it is available for combustion. Modelling of this process is required to aid in the development of new combustion systems; the Conditional Moment Closure (CMC) model is well suited for such modelling. However, the behaviour of key terms in the CMC transport equation — the conditional scalar dissipation, mixture fraction probability density function (PDF) and conditional source term — is not understood well for this case. Note that the conditional source term only appears when one of the key reactants changes state to become a gas. A Direct Numerical Simulation (DNS) study was performed to collect data on successful and unsuccessful combustion when the fuel is fully comprised of liquid droplets in cold air and spark power is used to evaporate the fuel and ignite the mixture. The data from the DNS are being used to develop models for the three key terms required for CMC modelling.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: USQ conference. Proceedings of this conference can be found at http://www.usq.edu.au/engsummit/proceedings
Depositing User: Dr Andrew Wandel
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 04 Feb 2011 05:17
Last Modified: 03 Jul 2013 00:27
Uncontrolled Keywords: spray combustion; DNS; CMC
Fields of Research (FOR2008): 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective (SEO2008): B Economic Development > 85 Energy > 8507 Energy Conservation and Efficiency > 850702 Energy Conservation and Efficiency in Transport
URI: http://eprints.usq.edu.au/id/eprint/18235

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