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This paper describes the development of a laser small-angle scattering instrument for size and concentration measurements of sprays at the National Aerospace Laboratory. A multiannular detector array having an optimal configuration for detecting diffractively scattered light signatures has been developed for the instrument. The inner radius of any detector element is exactly equal to the outer radius of the element placed in the immediate inside. Particle size distributions are determined from the measured energy data by nonlinear and linear best-fitting reconstruction methods. Application of the instrument to the diagnostics of a hollow cone spray is presented. The profile of the liquid concentration as well as the size distribution in the spray has been successfully determined by analyzing the line-of-sight integrated scattered energy data.
small-angle scattering, particle sizing, size distribution, particle concentration, spray diagnostics, photodetector array, inversion
Senior researcher, National Aerospace Laboratory, Tokyo,