Hydrocarbon-vapor measurements in pulsed fuel sprays

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Abstract
The feasibility of the use of a nonintrusive, line-of-sight averaging, infrared extinction technique for the quantitative measurement of fuel-vapor concentration and flux in transient sprays has been examined. A collinear visible and infrared system with a compact sandwich detector design allows for the detection of radiation at both wavelengths simultaneously. With a controlled simulated fuel spray that consists of styrene spheres and methane vapor, vapor concentrations were measured within 10% of the known input value for a large range of particle loadings. Quantitative measurements were also made in a transient isooctane spray with an automotive-type injector. The time-resolved vapor mole fraction, velocity, and mass flux were compared with the transient liquid-phase characteristics obtained with a phase/Doppler anemometer system. The combined use of both instruments for discerning differences in liquid and vapor transport is discussed.