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Optimization of mixture preparation in an S.I. engine

Fry, Michael David; (1994) Optimization of mixture preparation in an S.I. engine. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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This thesis commences with a survey of literature relevant to the subject of toxic emissions from SI engines and the methods available for reduction. The survey pointed to a particular route for reducing emissions by the use of a device in the port to increase in-cylinder motion at low engine speed and load conditions, coupled with an improvement in mixture preparation. This was to be investigated on an ECP2 engine which had been designed and manufactured by Jaguar. Initial testing was performed on a steady flow test rig using ECP2 hardware to investigate air flow patterns within the port. An understanding of the air flow in the inlet port is a precursor to the understanding of subsequent fuel/air interactions. This was followed by a series of tests to evaluate an air-assisted atomiser fuel injector, carried out by applying laser diffraction particle sizing techniques. The main body of work is associated with the investigation of mixture preparation within the cylinder and this required the design of a purpose-built single-cylinder engine. The design and construction of the optically-accessed research engine is covered in some depth. The engine was fitted with a 70 mm diameter quartz window in the piston crown and with smaller windows in the inlet ports. The development of engine and instrumentation control systems is also described. These tasks included electronic circuit design, calibration, and computer software development. A test program was performed on the engine using a copper-vapour laser and high-speed cine equipment. Photographic procedures were refined to obtain high-speed cine films of in-cylinder fuel behaviour in the firing engine. Image digitisation equipment was developed and software techniques were established to process the cine-film results of engine tests. The results of the test program are presented along with discussions and conclusions drawn. The design of a novel fuel vaporisation/atomisation unit is also described.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Optimization of mixture preparation in an S.I. engine
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
Keywords: Applied sciences; Fuel-air mixtures
URI: https://discovery.ucl.ac.uk/id/eprint/10099072
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