含颗粒横射流流动结构和颗粒分布特征的实验研究

he flow structure and particle distribution characteristics of particle-laden transverse jet were experimentally investigated in detail by means of PDA measurement. The mean velocity, turbulence intensity and particle concentration profiles of both phases in various regions were obtained under the experimental conditions of the different velocity ratios R (R=2~10). The experimental results indicate that in the typical experimental run under consideration (H/d=20, R=6), the particles with the mean diameters d=0.07mm have no appreciable effect on the flow structure in near region, whereas the large-scale vortical structures induced by the interaction between the jet and ambient crossflow play an important role in the particle distribution, among which the shear layer vortices, during their formation and evolution, dominate the nonuniformity of the particle distribution in the jet deflection zone within the near region. The preferential accumulation of the particles in the shear layer regions occurs, and with the increasing streamwise distances x/d, the range of the nonuniform particle distribution is consequently expanded to the overall water depth in far region due to the lateral spread and entrainment.