Patent ID: 7597283
Filing Date: 2009-10-06
Classification: B64D,F02C

Abstract:
1. An auxiliary power unit intake duct with aero-acoustic guide vanes for an aircraft, the intake duct comprising an internal straight portion, an internal first bend portion and an internal second bend portion, said internal portions extending between a duct air inlet and a plenum entry of the auxiliary power unit, the second bend having a first side wall having a first side wall curvature and a second side wall having a second side wall curvature, the second side wall being shorter than the first side wall, the first bend portion extending between the straight portion and the second bend portion, said second bend portion having a bend curvature; and wherein the intake duct further comprises a plurality of acoustic guides vanes located in said straight portion of the intake duct, said acoustic guide vanes extending horizontally between opposite side portions of said straight portion; and a plurality of curved aerodynamic guide vanes located in said second bend portion proximate to said plenum inlet, said curved aerodynamic guide vanes extending vertically between a top portion and a bottom portion of said second bend portion; each of said curved aerodynamic guide vanes being concentric with said bend curvature of said second bend portion.