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1. 发明授权

US06178740B2 Turbo fan engine nacelle exhaust system with concave primary nozzle plug 有权
标题翻译：涡轮风扇发动机机舱排气系统带凹形主喷嘴塞
公开(公告)号：US06178740B2
公开(公告)日：2001-01-30
申请号：US09257408
申请日：1999-02-25
申请人： Michael W. Su , Steve D. Podleski , Thomas A. Gally , Sean A. Newsum
发明人： Michael W. Su , Steve D. Podleski , Thomas A. Gally , Sean A. Newsum
IPC分类号： F02K302
CPC分类号： F02K1/78 , B64D33/06 , F02K1/00 , F02K1/386 , F05D2250/712 , Y02T50/671
摘要： A turbo fan engine nacelle houses an engine which forces engine exhaust through a primary nozzle and a fan nozzle positioned along a common central axis. The primary nozzle is bordered interiorly by a primary nozzle plug and bordered exteriorly by a primary nozzle sleeve. The fan nozzle is bordered interiorly by a core cowl and bordered exteriorly by a fan nozzle sleeve. The primary nozzle plug includes a generally cone shaped outer surface which is concave when viewed in side elevation. The concave outer surface has a radius of curvature (Rc). The core cowl has a distal end which is radially spaced from the outer surface of the primary plug by a distance (&Dgr;H) in a direction perpendicular to the central axis. The primary nozzle plug and core cowl define a ratio Rc/&Dgr;H between approximately 14 and 18. The distal end of the core cowl has a core cowl radius Rp with respect to the central axis. A discharge end of the fan nozzle sleeve has a fan nozzle sleeve radius Rf, wherein a ratio Rp/Rf is between approximately 0.4 and 0.6. The outer surface of the primary plug forms a primary plug angle &phgr;p between approximately 13° and 19° with respect to the central axis at the primary nozzle exit. The proper scaling of these key dimensions thereby defines a primary nozzle which reduces the shock associated noise of the turbo fan engine.
摘要翻译：涡轮风扇发动机机舱容纳发动机，其通过主喷嘴和沿共同的中心轴定位的风扇喷嘴迫使发动机排气。主喷嘴在内部由主喷嘴塞接合并且由主喷嘴套筒外部边界。风扇喷嘴在内部由核心罩盖接合，并由风扇喷嘴套筒外部接合。主喷嘴塞包括大致锥形的外表面，当从侧视图观察时，该外表面是凹形的。凹面外表面具有曲率半径（Rc）。核心整流罩具有远离主体塞的外表面沿垂直于中心轴线的方向径向间隔距离（DELTAH）的远端。主喷嘴塞和芯总成在约14和18之间限定了比率Rc / DELTAH。核心整流罩的远端相对于中心轴线具有一个核心整流罩半径R p。风扇喷嘴套筒的排出端具有风扇喷嘴套筒半径Rf，其中比率Rp / Rf在大约0.4和0.6之间。主塞的外表面在主喷嘴出口处相对于中心轴形成大约13°和19°之间的主要插塞角度。这些关键尺寸的适当缩放因此限定了一个主喷嘴，其减少涡轮风扇发动机的冲击相关噪声。

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