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• W2897360023 abstract "Experimental measurements are presented for a pressure-atomized hollow cone spray introduced into nonswirling and swirling air flow fields. An ensemble light scattering technique, based on measurement of the polarization ratio, is used to obtain detailed information on mean droplet size and number density in dense regions of the spray. The results reveal that combustion air swirl has a significant influence on the spray structure. Mean droplet size on the spray boundary is found to be larger than that on the centerline for both the nonswirling and swirling cases. Mean droplet size is also found to increase with distance along the centerline and spray boundary; this trend is attributed to the vaporization of smaller droplets and/or possible coalescence between the droplets.In addition to the ensemble technique, measurements have been obtained with the phase/Doppler interferometry and light intensity deconvolution techniques under identical experimental conditions. Measured mean droplet size is significantly different for each technique at all positions in the spray. The general features of the radial profiles obtained with the ensemble and phase/Doppler techniques are similar, but the ensemble approach results in consistently lower values of mean droplet size. The deconvolution technique indicates the presence of smaller size droplets and supports the results obtained with the ensemble technique. The ensemble and phase/Doppler techniques have been found to be applicable to dense sprays; the configuration used in the deconvolution apparatus limited its application only to the dilute regions of the spray. The results reveal that the examined techniques are selectively sensitive to different ranges of droplet size and number density.Experimental measurements are presented for a pressure-atomized hollow cone spray introduced into nonswirling and swirling air flow fields. An ensemble light scattering technique, based on measurement of the polarization ratio, is used to obtain detailed information on mean droplet size and number density in dense regions of the spray. The results reveal that combustion air swirl has a significant influence on the spray structure. Mean droplet size on the spray boundary is found to be larger than that on the centerline for both the nonswirling and swirling cases. Mean droplet size is also found to increase with distance along the centerline and spray boundary; this trend is attributed to the vaporization of smaller droplets and/or possible coalescence between the droplets.In addition to the ensemble technique, measurements have been obtained with the phase/Doppler interferometry and light intensity deconvolution techniques under identical experimental conditions. Measured mean droplet size is significantl..." @default.
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• W2897360023 date "1986-01-01" @default.
• W2897360023 modified "2023-09-27" @default.
• W2897360023 title "Laser diagnostics for characterization of fuel sprays" @default.
• W2897360023 doi "https://doi.org/10.2351/1.5057799" @default.
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