Study of the droplet size effect coupled with the laser light scattering in sprays for two-color LIF thermometry measurements

摘要: The present paper deals with a new optical diagnostic that aims to perform droplet temperature measurements based on the two-color laser-induced fluorescence (2cLIF). 2cLIF requires single tracer, and intensity is collected two spectral bands. ratio of both intensities measured in case monodisperse droplets depends principle only temperature. However, application polydispere sprays failed. Indeed, dependence size correlated depth field optics, used for collection, induces bias value. This work analyses these coupled effects by using combined LIF Phase Doppler Analyser measurements. device allows achieving per class. study conducted different terms particles density. use third band detection (3cLIF) long distance microscope leads correct effect reduce effect, respectively. These investigations are then demonstrated measuring temperatures an overheated water spray.