FLOW CHARACTERISTICS OF PLANE WALL JET WITH SIDE WALLS ON BOTH SIDES(Wall Jet and Wall Flow)

Flow characteristics of two-dimensional jet with side walls has been studied experimentally. Three kinds of cylindrical walls and a flat wall are provided for the side wall and they are combined and attached to the nozzle. Nine types of side wall conditions are investigated here. Velocity has been measured by a hot wire probe and separation point has been measured by a Pitot tube. Mean velocity profiles, growth of jet half width, decay of jet maximum velocity, and attachment distance are clarified. It is found that when cylindrical walls with different radii are installed, flow pattern changes remarkably depending on the jet velocity. Striking increase in jet half width is found to be related to the flow separation from the smaller cylindrical wall just behind the nozzle by the flow visualization.