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Observation and measurement of fuel distribution within a spark-ignition engine

Queenan, Kathleen Bernadette; (1998) Observation and measurement of fuel distribution within a spark-ignition engine. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

The thesis describes the work carried out to identify the behaviour of liquid fuel within the cylinder of a particular design of current spark ignition 4-valve engine for several different designs of fuel injector including an air-assisted version. A combination of techniques was used to study fuel behaviour, namely high-speed cine photography, image capture with CCD cameras, and a cylinder wall liquid skimming technique. It was concluded that the majority of the liquid fuel entering the cylinder travelled down the cylinder bore and impacted on the piston crown, regardless of what type of injector was employed. The work changed to a study how the fuelling arrangements might be changed to satisfy the even tighter emission legislation that was being implemented. The method chosen was to develop a stratified charge engine by repositioning the injector such that its fuel spray would be deflected off an open inlet valve in the direction of the spark plug. One of the two inlet ports would be de-activated at part load to create axial swirl to stabilise the air/fuel mixture during the compression stroke. Initial development work of this concept was carried out to enable an injector mounting block to be designed that would position the injector at the 'optimum' location when mounted onto a single cylinder research engine. Testing of the concept revolved around high-speed cine tests and the use of a Cambustion HFR400 fast flame ionisation detector to measure real-time in-cylinder HC concentrations at various locations around the combustion chamber. The cine results indicated that the liquid fuel was mainly being deflected in the direction of the spark plug. The gas sampling measurements showed that a mixture of approximately 3 air fuel ratios richer around the spark plug at idle for the optimum -valve injection timing of 135° ATDC and 6 air fuel ratios at 1500 rpm road load condition.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Observation and measurement of fuel distribution within a spark-ignition 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 distribution
URI: https://discovery.ucl.ac.uk/id/eprint/10102252
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