Engine Design Studies for a Silent Aircraft
Engine Design Studies for a Silent Aircraft
复制标题
静音飞机的发动机设计研究
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Crichton
中科院分区：
文献类型：
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作者：
C. Hall;D. Crichton
静音飞机计划是剑桥-麻省理工学院资助的一个研究项目，旨在减少飞机噪音，使其在机场周围的城市环境中难以察觉。正在为该项目开发的推进系统具有基于超高涵道比涡轮风扇发动机的热力循环，该发动机与可变面积排气喷嘴和嵌入式装置相结合。该循环已与全升力体机体的飞行使命和推力要求相匹配，并通过可变排气喷管的精确调度，优化了发动机工作条件，以实现爬升顶部的最大推力、巡航期间的最小燃料消耗和低空的最小喷气噪音。本文提出的发动机机械装置，可以满足循环要求，当安装在一个适当的机身，将是安静的相对于目前的涡轮风扇发动机。为了减小发动机重量，提出了具有齿轮箱或一些其它形式的轴减速装置的系统。这与低速风扇和具有高间隙-弦间距的涡轮机相结合，以进一步降低噪声源噪声。还介绍了一种由单个核心驱动的三个风扇的发动机配置，预计这种配置将具有进一步的重量、燃料燃烧和噪声优势。
The Silent Aircraft Initiative is a research project funded by the Cambridge-MIT Institute aimed at reducing aircraft noise to the point where it is imperceptible in the urban environments around airports. The propulsion system being developed for this project has a thermodynamic cycle based on an ultra-high bypass ratio turbofan combined with a variable area exhaust nozzle and an embedded installation. This cycle has been matched to the flight mission and thrust requirements of an all-lifting body airframe, and through precise scheduling of the variable exhaust nozzle, the engine operating conditions have been optimized for maximum thrust at top-of-climb, minimum fuel consumption during cruise and minimum jet noise at low altitude. This paper proposes engine mechanical arrangements that can meet the cycle requirements and, when installed in an appropriate airframe, will be quiet relative to current turbofans. To reduce the engine weight a system with a gearbox, or some other form of shaft speed reduction device, is proposed. This is combined with a low-speed fan and a turbine with high gap-chord spacing to further reduce turbomachinery source noise. An engine configuration with three fans driven by a single core is also presented and this is expected to have further weight, fuel burn and noise benefits.Copyright © 2006 by ASME