Effect of a lip attached on one side of a two-dimensional nozzle upon free plane jet

This study deals with the free jet from an asymmetrical two-dimensional nozzle whose asymmetry is introduced by a lip attached on one side of the nozzle. Experiments are conducted for three Reynolds numbers; 1000, 3000 and 6000. The aspect ratio of the nozzle exit is fixed at 300, which can be large enough to research the fundamental behaviour of a plane jet. In order to clarify the effect of the lip length, the lip length l varies in a wide range of 0 - 20h, where h denotes the height of the nozzle exit. Then, the authors show such basic characteristics of the jet as mean-velocity and turbulence-intensity profiles at various downstream sections, which suggest a potential in the control of a plane jet especially concerning its deflection angle in far downstream, which vibrates with l . Besides, the authors reveal negligible Reynolds number effects more than 3000, and propose an empirical formula to predict the deflection angle.