Jet Issuing from 90' Curved Nozzle

Abstract

A jet issuing from a curved nozzle has been investigated experimentally under R_e=4×10⁴. The curved nozzle has a 90° circular bend with a diameter 40 mm and a curvature radius 80 mm. Mean velocity is measured by using an inclined hot wire. The following conclusions are derived from experimental results: (1) The jet axis shifts gradually from the curved nozzle axis ; (2) The maximum axial velocity of a curved nozzle jet decays more rapidly than that of a straight nozzle jet ; (3) The velocity profile, which is skewed by a secondary flow near the curved nozzle, turns out to be similar to that of the axis-symmetric jet in the down stream.