Fuel Anti-Knock Quality - Part I. Engine Studies Shell Global Solutions

Format:

Conference/Event

Author/Creator:

Kalghatgi, G.T., author.

Conference Name:

SAE 2002 World Congress & Exhibition (2002-03-04 : Detroit, Michigan, United States)

SAE International Fall Fuels & Lubricants Meeting & Exhibition (2001-09-24 : San Antonio, Texas, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2001

Summary:

This is the first part of a two-part study on how to define the anti-knock quality of practical fuels. Knock intensity is measured in two single-cylinder research engines using different fuels at different mixture strengths, throttle settings and two compression ratios. The anti-knock quality of a fuel in a given engine operating condition is defined by its octane index OI = RON - KS where K is a constant for that condition and S is the sensitivity, (RON-MON), and RON and MON are the Research and Motor Octane numbers respectively. The higher the octane index, the better the anti-knock quality of the fuel. K is often assumed to be 0.5 so that OI=(RON+MON)/2. However, it is found that K depends on engine operating conditions and in some cases, K is negative so that for a given RON, a fuel with higher sensitivity (lower MON) has better anti-knock quality. The value of K decreases as the engine becomes more prone to knock id est as its octane requirement increases. In terms of the end-gas properties, K decreases as the temperature decreases for a given pressure

Notes:

Vendor supplied data

Publisher Number:

2001-01-3584

Access Restriction:

Restricted for use by site license