| 摘要 |
<p>A flow discharge device, such as a compressor bleed outlet discharging into a bypass duct (22, fig.1) of a gas turbine engine, comprises an outlet panel 46 having at least one opening which tapers in the downstream direction with respect to the flow B in the bypass duct. The outlet may have a single opening or may be perforated by a number of openings 48, 50 disposed in an array. The configuration of the array of openings 48, 50 creates a plume 60 of tapering form, which enables the bypass flow B to come together downstream of the plume 60 with minimal wake generation, to provide a shield of cooler air so as to avoid contact between the hot gas plume 60 and a wall of (27,fig.1) of the bypass duct 22. The resulting aerofoil-shaped cross section of the plume 60 also reduces any blocking effect in the bypass duct (22), with consequent performance benefits for the engine fan (13, fig. 1).</p> |
