Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2016 - November 13, 2016
The mean flow properties of the multiple circular jets issuing from circular nozzles in a line were investigated experimentally. The aim of this study is to clarify an effect of the arrangement pitch of the circular nozzles on the mixing and the development processes of the jets. In this study, the nozzle arrangement pitch (S/d) was set to 4.2, 2.8 and 1.4. S/d indicates a nozzle arrangement pitch which is normalized with nozzle diameter d. Reynolds number was kept constant at 25000 throughout the present experiment. The experiments were made using an X-type hot wire probe and the linearized constant temperature anemometers to measure the longitudinal mean velocity. From this experiment, it is revealed that the section of which Uox/Ue on the x axis shows the decreasing rate of the two dimensional jet (Uox ∝ (x/d) -0.5), moves toward the upstream region as decreasing with S/d.
