Makoto Yamamoto

Large Eddy Simulation Analysis of Lobed Mixer Nozzle

Large Eddy Simulation (LES) was applied to predict the mixing characteristics of a lobed mixer nozzle analysis. LES was first validated by using experimental data of a convergent-divergent nozzle (CD nozzle) flow. Then, the LES results of the lobed mixer nozzle with a ejector duct were evaluated by comparing with measured data. LES analysis provided more reasonable agreement than Reynolds-averaged Navier Stokes (RANS) analysis.

Proposal of a Reynolds Stress Model for Gas-Particle Turbulent Flows and its Application to Cylone Separators

Abstract A Reynolds stress model for predicting gas-particle two phase turbulent flows has been developed in order to take account of interactions between dispersed particles and fluid turbulence. The effects of dispersed particles on fluid turbulence are added to the Reynolds stress model for single-phase turbulent flows. The model coefficients are determined based on the experimental data of the gas-particle round jet and the fully-developed vertical pipe flow. The proposed model can satisfactorily reproduce the mean flow and turbulent properties of the gas-particle round jet, the fully-developed pipe flow and the swirling flow. Finally, the model is applied to the gas-particle highly swirling flow in the cyclone separator in order to predict the particle collection performance. It is shown that the present model can reproduce the flow field, whereas it slightly underestimates the particle collection efficiency for fine particles.