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Experimental investigation of the spray autoignition of n-heptane in a jet in cross flow configuration and comparison to single droplet ignition simulations [Elektronische Ressource] / von Peter Rickmers

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Experimental Investigation of the Spray Autoignition of n – Heptane in a Jet in Cross Flow Configuration and Comparison to Single Droplet Ignition Simulations Dem Fachbereich Produktionstechnik der UNIVERSITÄT BREMEN zur Erlangung des Grades Doktor-Ingenieur genehmigte Dissertation von MEng. Peter Rickmers Gutachter: Prof.-Dr. H. J. Rath Prof.-Dr. F. Dinkelacker Tag der mündlichen Prüfung: 05.07.2010 Abstract Modern combustion machines, which inject liquid hydrocarbon fuels into compressed air at high temperatures, aim for a high compression ratio to achieve high process efficiency. This means, there is only a limited residence time of the fuel in the combustion chamber before autoignition. The residence time however is important in terms of vaporizing and turbulent mixing of the fuel with air. A well stirred mixture with a lean overall equivalence ratio (near the lean flammability limit) will reduce the combustion temperature and in turn reduce the production of nitric oxides (NO, N O and NO ) through the Zeldovich mechanism. 2 2This thesis details the results obtained under the ESA MAP project CPS III (Combustion Properties of Partially Premixed Spray Systems), where (amongst other topics) n-heptane sprays are observed under machine conditions and these experimental results are compared to numerical results of a simulation for single droplet ignition.

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Published 01 January 2010
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Language English
Document size 31 MB