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Two-phase fuel visualisation in a direct-injection gasoline engine.

Davy, Martin Howard; (2000) Two-phase fuel visualisation in a direct-injection gasoline engine. Doctoral thesis (Ph.D.), University College London. Green open access

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This thesis presents the findings of a series of experimental investigations into liquid and vapour-phase fuel behaviour in a firing gasoline direct injection (GD-I) engine. Conceptually, the thesis is divided into four subsections. In the first of these subsections, the author presents a literature review of contemporary mixture-preparation strategies for gasoline engines. The review is extended to include experimental methods for the investigation of air-fuel mixing and in-cylinder fuel distributions and closes by considering the application of the reviewed techniques to the special case of the GD-I engine. The second subsection presents the results of a study into the affect of injection timing on liquid-phase fuel distributions in an optically-accessed GD-I engine with a near-central fuel injector position. Two-dimensional fuel distribution images are shown for a wide range of fuel injection timings. The experimental results are compared with the results of an independent study of exhaust emissions, and a phenomenological model describing the emissions formation in relation to the in-cylinder location of the liquid fuel is developed and discussed. The third subsection presents the results of an experimental study into the affect of fuel composition on spray development and air-fuel mixing in the same optical GD-I engine - featuring a near-central fuel injector - as used in the previous study. The effects of cylinder temperature and fuel volatility on the spray development are discussed. In addition to liquid-phase studies, this subsection presents vapour-phase images collected using the technique of laser- induced fluorescence. In light of the presented results, fluorescence imaging and the influence of base fuel on the dopant images are discussed at length. The final subsection of this thesis presents the results of a Mie- scattering study in a firing optical GD-I engine featuring a side-mounted fuel injector. The influence of fuel injection pressure on the mixture formation process and spray characteristics is examined.

Type: Thesis (Doctoral)
Qualification: Ph.D.
Title: Two-phase fuel visualisation in a direct-injection gasoline engine.
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by Proquest
URI: https://discovery.ucl.ac.uk/id/eprint/10109350
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