| 摘要 |
<p>A load compressor 18 of a gas turbine engine auxiliary power unit has a radial intake opening 70, adjustable air inlet guide vanes 84 spaced around the opening and walls 64, 66 defining an annular radial-to- axial flow passage 68 through which the gas swirls with a vortex movement imparted thereto by the inclination of respective pivoted guide vane parts 88. Vortex whistle noise is reduced by two radially inwardly projecting baffle members 110a (and 110b, Fig. 4 not shown) mounted on diametrically opposite guide vanes 84a (and 84b) which members extend into the gas flow path to create small regions of random turbulence which act to attenuate the whistle noise. <IMAGE></p> |
