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Auxiliary power unit inlet duct assembly for mitigating noise

一种辅助动力单元、入口组件的技术，应用在飞机领域，能够解决增加飞机实质性成本、复杂性和重量、增加入口系统流动阻力等问题

Active Publication Date: 2017-06-27
GULFSTREAM AEROSPACE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these vanes increase the flow resistance of the inlet system and may require larger duct cross-sections in order not to unduly restrict airflow into the APU
therefore, these solutions may add substantial cost, complexity and weight to the aircraft

Method used

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  • Auxiliary power unit inlet duct assembly for mitigating noise
  • Auxiliary power unit inlet duct assembly for mitigating noise
  • Auxiliary power unit inlet duct assembly for mitigating noise

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Embodiment Construction

[0022] The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.

[0023] An improved auxiliary power unit inlet duct assembly is disclosed herein. In a non-limiting embodiment, the auxiliary power unit inlet duct assembly includes an inlet duct door assembly having a sound absorbing member mounted to a portion of the door facing the inlet of the inlet duct assembly. The sound absorbing component is positioned such that sound emanating from the inlet of the inlet duct assembly impinges on and is at least partially absorbed by the sound absorbing component before being redirected to the surrounding environment. In conventional inlet duct assemblies without sound absorbing components on the inlet duct door, the sound emanating from the inlet will s...

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PUM

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Abstract

An auxiliary power unit inlet assembly includes an inlet duct having a first end and a second end. The auxiliary power unit inlet assembly further includes a door associated with the second end of the inlet duct. The door moves between a first position and a second position. The door closes the second end of the inlet duct when in the first position and permits air to enter the second end of the inlet duct when in the second position. The auxiliary power unit inlet assembly further includes a sound absorbing component mounted to the door and disposed proximate the inlet duct. The sound absorbing component is positioned at a location on the door such that a noise generated by the auxiliary power unit will directly impinge on the sound absorbing component.

Description

technical field [0001] The present invention relates generally to aircraft, and more particularly to an APU inlet duct assembly equipped with a door assembly for reducing noise generated by an APU. Background technique [0002] Jet aircraft typically include an auxiliary power unit. The auxiliary power unit provides electrical power to the aircraft primarily during jet engine shutdowns. For example, when passengers board or disembark from an airplane, an auxiliary power unit is often activated to provide power to the airplane's systems. [0003] The auxiliary power unit is a jet engine connected to a generator rather than to the propulsion system. Like all jet engines, the auxiliary power unit requires an air supply. Because the auxiliary power unit is mounted in the fuselage rather than the nacelle, it is not exposed to the ambient air around the aircraft and therefore requires a dedicated path for supplying it with air and a dedicated path for exhausting it. The path f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C7/045
CPCF02C7/045B64D2041/002F05D2220/50B64D41/00B64D2033/0213B64D33/02B64D2033/0206Y02T50/60
Inventor 迈克·卢卡斯
Owner GULFSTREAM AEROSPACE CORP