THE AEROACOUSTICS AND AERODYNAMICS OF HIGH-SPEED COANDA DEVICES, PART1 - CONVENTIONAL ARRANGEMENT OF EXIT NOZZLE AND SURFACE

The literature on high-speed Coanda flows and its applications is revi ewed. The lack of basic information for design engineers is noted. The present paper is based on an investigation of the aeroacoustics and a erodynamics of the high-speed Coanda flow that is formed when a supers onic jet issues from a radial nozzle and adheres to a tulip-shaped bod y of revolution. Schlieren and other flow visualization techniques tog ether with theoretical methods are used to reveal the various features of this complex flow field. The acoustic characteristics were obtaine d from measurements with an array of microphones in an anechoic chambe r. The emphasis is placed on those features of the aerodynamics and ae roacoustics which may be of general interest. (C) 1997 Academic Press Limited.