Multi-component Quantitative PLIF: Robust Engineering and Measurements of Cyclic Variation in a Firing Spray-guided Gasoline Direct Injection Engine

Document Number: 2008-01-1073

Date Published: April 2008

Author(s):
Ben Williams - Univ. of Oxford
Paul Ewart - Univ. of Oxford
Richard Stone - Univ. of Oxford
Hongrui Ma - Shell Global Solutions (UK)
Harold Walmsley - Shell
Roger Cracknell - Shell Global Solutions (UK)
Robert Stevens - Univ. of Oxford
Dave Richardson - Jaguar Cars, Ltd.
Jun Qiao - Jaguar Cars, Ltd.
Stan Wallace - Jaguar Cars, Ltd.

Abstract:
Planar Laser-Induced Fluorescence has been widely accepted and applied to measurements of fuel concentration distributions in IC engines. The need for such measurements has increased with the introduction of Direct Injection (DI) gasoline engines, where it is critical to understand the influence of mixture inhomogeneity on ignition and subsequent combustion, and in particular the implications for cyclic variability.

The apparent simplicity of PLIF has led to misunderstanding of the technique when applied to quantitative measurements of fuel distributions. This paper presents a series of engineering methods for optimizing, calibrating and referencing, which together demonstrate a quantitative measure of fuel concentration with an absolute accuracy of 10%.

PLIF is widely used with single component fuels as carriers for the fluorescent tracers. This paper shows that this method inadequately describes a real fuel spray, and presents instead a method that uses a fully fractionated multi-component fuel for PLIF diagnostics.

A series of measurements is presented of fuel distribution, early injection DI homogeneity and cyclic variation of injector plumes in a DI single-cylinder optical research engine.

File Size: 1663K
Product Status: In Stock

Included in: SP-2178

See other papers presented at SAE World Congress & Exhibition, April 2008, Detroit, MI, USA, Session: Combustion and Flow Diagnostics (Part 2 of 2)

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