抄録
The mean flow properties of turbulent free jets issuing from twin circular nozzles with various nozzle spacing were investigated experimentally. The aim of this study is to clarify the effect of the difference in nozzle spacing on the mixing and diffusion processes. The nozzle spacing used in this study was 2,4 and 8 nozzle diameters. Reynolds number based on the nozzle diameter and the mean exit velocity, was kept constant 25,000 through this experiment. Measurements were made using an X-type hot wire probe and the linearized constant temperature anemometers. In this experiment, the quantity measured was longitudinal mean velocity. From the results, the effects of the difference in nozzle spacing on the streamwise variation of the velocity and the length scales were revealed, and the growth rate of volume flux of twin jets was smaller than that of the single circular jet.
