EXPERIMENTAL INVESTIGATION OF THE FLOWFIELD OF DUCT FLOW WITH AN INCLINED JET INJECTION - DIFFERENCE BETWEEN FLOWFIELDS WITH AND WITHOUT A GUIDE VANE

摘要

An experimental study is carried out in order to investigate the possibility of deflecting inclined jet flow by means of a guide vane. The present study provides basic knowledge on designing the tunnel ventilation facility. A 7,700-mm-long main duct with a 230 mm × 230 mm square cross section is constructed. The main duct has an injection nozzle with an opening of 92 mm × 20 mm. The nozzle is installed at an angle of 30 degrees 1,780 mm downstream from the beginning of the main duct. Velocity distributions were measured both with and without the guide vane. The velocity distribution without a guide vane revealed a stronger downwash, whereas that with guide vanes showed weaker downwash.