Multi-Component Quantitative PLIF: Robust Engineering Measurements of Cyclic Variation in a Firing Spray-Guided Gasoline Direct Injection Engine 2008-01-1073
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.
Citation: Williams, B., Ewart, P., Stone, R., Ma, H. et al., "Multi-Component Quantitative PLIF: Robust Engineering Measurements of Cyclic Variation in a Firing Spray-Guided Gasoline Direct Injection Engine," SAE Technical Paper 2008-01-1073, 2008, https://doi.org/10.4271/2008-01-1073. Download Citation
Ben Williams, Paul Ewart, Richard Stone, Hongrui Ma, Harold Walmsley, Roger Cracknell, Robert Stevens, David Richardson, Jun Qiao, Stan Wallace
University of Oxford, Shell Global Solutions (UK) Ltd, Jaguar Cars Ltd
SAE World Congress & Exhibition
Combustion and Flow Diagnostics and Fundamental Advances inThermal and Fluid Sciences, 2008-SP-2178