Study on Control of Radial Attaching Jet Flow : 3rd Report, Flow before Reattachment Point

Abstract

This paper describes an experimental investigation on the control of a radial turbulent jet flow reattached to an adjacent offset disc plate with an additional control flow. Mean velocity and turbulent velocity distributions were measured with the aid of a hot-wire anemometer, and the effects of step height and control flow rate (ratio of control flow to main jet flow, suction and blowing) on the flow before reattachment point were investigated. The results were compared with those obtained from the pressure distributions. Changes of the maximum jet center velocity, jet half width and turbulence at velocity maxima, and also deflection of jet center axis, depend on the combination of the step height and control flow rate.