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Details of Grant 

EPSRC Reference: GR/J47002/01
Title: FUNDAMENTAL CHEMICAL AND AERODYNAMIC ASPECTS OF END-GAS AUTOIGNITION AND KNOCK IN GASOLINE ENGINES
Principal Investigator: Sheppard, Professor CGW
Other Investigators:
Berzins, Professor M Griffiths, Professor J
Researcher Co-Investigators:
Project Partners:
Department: Mechanical Engineering
Organisation: University of Leeds
Scheme: Standard Research (Pre-FEC)
Starts: 01 January 1994 Ends: 31 March 1997 Value (£): 184,573
EPSRC Research Topic Classifications:
Combustion
EPSRC Industrial Sector Classifications:
Transport Systems and Vehicles
Related Grants:
Panel History:  
Summary on Grant Application Form
The prescription of metallic anti-knock additives, combined with the necessity for higher engines efficiencies and minimal noxious emissions necessitates new approaches to autoignition and knock. Earlier work at Leeds has enabled cylinder flame transit time to the end gas to be estimated. If autoignition is to be avoided, this must be less that the autoignition time. Collaboration with chemists will provide basic data for different fuels and mixture strengths, that will enable the time to end gas autoignition (if any) to be predicted, as well as the rate of heat release at the end of this time. This rate determines the strength of the pressure pulses generated by autoignition. The chemical data will be incorporated into mathematical models for engine autoignition, flame propagation and pressure pulse generation. Chemical studies, validating experiments with optically accessed engines, and improvements to mathematical models will all occur in parallel. The aims are to identify regimes of engine operation (fuel, mixture strength, spark timing, intake conditions, compression ratio) where: (a) autoignition might be avoided; (b) autoignition occurs but damaging pressure pulses might be avoided; (c) damaging pressure pulses might occur; (d) in addition, numerical aspects of the model of pressure pulse generation will be improved to make it a more reliable chemical and engine performance indicator.
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Organisation Website: http://www.leeds.ac.uk