A Study of the Ignition-Delay Character of n-Heptane in the IQT Combustion Bomb Using CFD Modelling Sasol Advanced Fuels Laboratory, University of Cape Town

Format:

Conference/Event

Author/Creator:

Metcalf, Owen J., author.

Conference Name:

2007 Fuels and Emissions Conference (2007-01-23 : Cape Town, South Africa)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2007

Summary:

The ASTM D6890 method predicts cetane numbers of diesel fuels based on the measured ignition delay in a combustion bomb (Ignition Quality Tester). The device is calibrated using n-heptane as the reference fuel. When n-heptane was tested in the IQT device over a range of temperatures and pressures, the measured ignition delay did not correlate with the chemical autoignition delay normally associated with a stoichiometric, homogeneous mixture as predicted by detailed chemical kinetic models. This paper describes an investigation to study and reconcile this discrepancy, using (CFD) techniques to explore the physical conditions prevailing in the IQT device. Significant insights regarding the flow patterns, thermal gradients and air/fuel ratio profiles were obtained from the analysis. The calculation yielded ignition-delay predictions (defined by the first appearance of a local autoignition) that correlated well with IQT experimental data

Notes:

Vendor supplied data

Publisher Number:

2007-01-0021

Access Restriction:

Restricted for use by site license