Abstract
Laser-induced fluorescence is used to quantify the thickness of liquid films. An optimisation of the fluorescent tracer to make it evaporate at the same ratios as gasoline is performed since the final application is the study of evaporating films, as those found in intake pipes of port-injected spark-ignited engines. The liquid studied is iso-octane and the tracer is a ketone. Because of distillation, the tracer concentration in the liquid film may not remain constant. The most suitable tracers are C6 ketones.
The optical set-up uses a single optical fibre for both laser excitation and fluorescence collection. It is designed for local measurements through transparent walls. A precise liquid wedge is used for calibration. An application is shown on a transparent pipe, with stationary air flow and pulsed low-pressure injection. The technique has proven to be able to show the unstationary phenomena. The impact of the spray, the deposition of a large quantity of fuel and the displacement of liquid waves are quantified and followed with time.
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Le Coz, JF., Baritaud, T. (1996). Application of Laser Induced Fluorescence for Measuring the Thickness of Evaporating Gasoline Liquid Films. In: Adrian, R.J., Durão, D.F.G., Durst, F., Heitor, M.V., Maeda, M., Whitelaw, J.H. (eds) Developments in Laser Techniques and Applications to Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79965-5_8
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DOI: https://doi.org/10.1007/978-3-642-79965-5_8
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