Effect of Particle Statistics on Measurements of Transient Sprays by Single-Particle Counters

The effect of the single-particle limitation on the response of phase-Doppler instruments is determined for particle distributions which are spatially nonuniform and time-dependent. Poisson statistics are applied to particle positions and arrival times within the phase-Doppler probe volume to determine the probability that a particle is accepted. The results are then applied to a numerical simulation of a diesel spray. The calculated hypothetical response of the instrument provides a quantitative demonstration of the regimes within which measurements can accurately be made in such sprays. (Author) This article is from 'International Symposium on Applications of Laser Techniques to Fluid Mechanics and Workshop on Computers in Flow Measurements (6th) Held in Lisbon, Portugal on July 20-23, 1992', AD-A258 510, p18.4.1-18.4.7.