公开(公告)号：WO2015166430A1

公开(公告)日：2015-11-05

申请号：PCT/IB2015/053117

申请日：2015-04-29

Applicant: PIAGGIO AERO INDUSTRIES S.P.A.

Inventor： MAGLIONE, Antonio ,  MANCINI, Michele ,  TRAVOSTINO, Giorgio ,  AVERSANO, Marco ,  SCATI, Damiano

IPC: B64C39/08 ,  B64C39/12 ,  B64D33/04 ,  F02K1/34

CPC classification number: B64C39/08 ,  B64D27/12 ,  B64D33/04 ,  B64D33/06 ,  F02C6/206 ,  F02K1/38 ,  F02K1/46 ,  F05D2220/324 ,  Y02T50/44 ,  Y02T50/671

Abstract: Aircraft (10) of the type comprising: - a fuselage (11); - a main wing (12), a front tab (13) and a horizontal tail plane (15) so as to make three lifting surfaces; - two turboprop units (34) mounted on the main wing (12) on opposite parts with respect to said fuselage (11) equipped with rear exhaust pipes (100); at least the outer section (102) of each exhaust pipe (100) has a curvilinear section with diverging configuration and is equipped with at least one opening (101) for the introduction of external air into said exhaust pipes (100) at said exhaust openings (103); said openings (101) being configured for: - promoting the entry of external air in a direction tangent to the walls of the duct and to the main flow that licks them, so as to reduce the separations of the flow naturally induced by the divergent shape of said outer section (102) of said exhaust pipe (100) and thus reduce the noise produced; and - increasing the efficiency of said exhaust pipe (100) also under subsonic conditions, thus increasing the effective area thereof with an increase of the mass processed by the engine, a reduction of the maximum speeds and the increase of the average speed of the flow.

Abstract translation: 这种类型的飞机（10）包括： - 机身（11）; - 主翼（12），前突片（13）和水平尾翼平面（15），以便形成三个提升表面; - 相对于装备有后排气管（100）的所述机身（11）的相对部分安装在所述主翼（12）上的两个涡轮螺旋桨飞机单元（34）。 至少每个排气管（100）的外部部分（102）具有发散构造的曲线部分，并且配备有至少一个开口（101），用于在所述排气口处将外部空气引入所述排气管（100） （103）; 所述开口（101）构造成： - 促进外部空气沿着与管道壁相切的方向进入，并使其舔它们的主流，从而减少由发散形状自然引起的流动的分离 所述排气管（100）的所述外部部分（102），从而减少所产生的噪音; 以及 - 在亚音速条件下也提高所述排气管（100）的效率，从而随着发动机处理的质量的增加而增加其有效面积，减小最大速度和提高流速的平均速度 。