Abstract of
CRITICAL APPRAISAL OF CURRENT LASER DIAGNOSTIC TECHNIQUES
FOR G-DI SPRAY KINEMATIC QUANTIFICATION
M.A. Comer, P.J.Bowen, S.M.Sapsford, C.J.Bates
Gasoline direct injection(G-DI) engines are the latest variants
in passenger vehicle engine design in pursuit of fuel economy improvement and
exhaust pollutant reduction. The operational principle of G-DI design means that
now more than ever, detailed information on the transient in-cylinder spray and
associated flow field characteristics are required, not least to provide verification
data for Computational Fluid Dynamic (CFD) models.
At this stage in an ongoing development programme, three contemporary laser-based
spray kinematic diagnostic techniques are critically appraised in respect of their
capacity to provide G-DI CFD verification data. High-speed sheet cinematography,
Particle Image Velocimetry (PIV) and phase averaged laser Doppler anemometry (PA-LDA)
are utilised in attempts to provide suitable data for full-field transient flow
characterization. Their respective strengths and current weaknesses are discussed
in the context of the G-DI application. Various parameters of G-DI sprays are
used for comparative purposes, including head-vortex characteristics, pintle-bounce,
injector delay and fuel penetration.
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Diagnostics in Engineering, Volume 5, Part 1 Contents