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1. 发明授权

US4288984A Noise suppressing turbofan nozzles and method 失效
标题翻译：噪音抑制涡轮风扇喷嘴及方法
公开(公告)号：US4288984A
公开(公告)日：1981-09-15
申请号：US943973
申请日：1978-09-19
申请人： Waman V. Bhat , Charles P. Wright
发明人： Waman V. Bhat , Charles P. Wright
IPC分类号： F02K1/38 , F02K1/44 , F02K1/46 , F02K3/06
CPC分类号： F02K1/386 , F02K1/44
摘要： Noise perceived below a turbofan is reduced by providing a thicker fan flow below the turbofan primary exhaust flow than is present in conventional turbofans having generally circular and concentric fan and exhaust flows. To thicken the fan flow, the exhaust nozzle is offset upward in the fan nozzle, or the exhaust nozzle discharge end is canted to offset the exhaust flow upward, or the exhaust nozzle is flattened to a generally rectangular or an elliptical shape having a major horizontal axis. In any of these cases, the thickness of the fan flow below the primary exhaust flow is increased and less noise is perceived below the turbofan than if circular concentric fan and exhaust flows were produced. In one embodiment a noise-suppressing thickened fan flow is used in combination with a conventional noise-suppressing multilobe or multitube mixing nozzle to further reduce noise perceived below the turbofan.
摘要翻译：通过在涡轮风扇初级排气流下方提供比现有的具有大致圆形和同心风扇和排气流的常规涡轮风扇中更厚的风扇流，减少了涡轮风扇以下的噪音。为了使风扇流动变厚，排气喷嘴在风扇喷嘴中向上偏移，或者排气喷嘴排出端倾斜以将排气向上偏移，或者排气喷嘴平坦化为具有主要水平的大致矩形或椭圆形轴。在任何这些情况下，如果产生圆形同心风扇和排气流，则风扇流量低于主排气流量的厚度增加，噪音低于涡轮风扇。在一个实施例中，噪声抑制增厚的风扇流与传统的噪声抑制多叶或多管混合喷嘴结合使用，以进一步降低在涡轮风扇下方感知到的噪音。

2. 发明授权

US4280587A Noise-suppressing jet engine nozzles and method 失效
标题翻译：噪声抑制喷气发动机喷嘴和方法
公开(公告)号：US4280587A
公开(公告)日：1981-07-28
申请号：US37381
申请日：1979-05-08
申请人： Waman V. Bhat
发明人： Waman V. Bhat
IPC分类号： F02K1/40 , F02K1/50 , F02K1/34
CPC分类号： F02K1/40 , F02K1/50
摘要： A discharge nozzle of a jet engine has lobes, tubes or deflectors for promoting mixing of the engine discharge flow with ambient air to reduce jet noise. By providing the lobes, tubes or deflectors at only the upper portion of the discharge nozzle, jet noise perceived below the engine is reduced substantially without shifting the noise spectrum to include a higher proportion of piercing and irritating high frequency noise components. Additionally, in a turbofan, the fan or secondary flow is discharged below the primary exhaust flow to further reduce noise perceived below the turbofan.
摘要翻译：喷气发动机的排放喷嘴具有用于促进发动机排出流与环境空气混合以减少喷射噪声的凸角，管或偏转器。通过仅在排放喷嘴的上部提供凸角，管或偏转器，在发动机下方感知的喷气噪声基本上减小，而不会使噪声谱变化，从而包括较高比例的刺穿和刺激的高频噪声分量。此外，在涡轮风扇中，风扇或二次流被排放到主排气流下方，以进一步降低涡轮风扇下方的噪音。

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