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Counter-rotating open fan propulsion system

A technology for propulsion systems and fans, used in rotating couplings, high-efficiency propulsion technology, jet propulsion devices, etc.

Active Publication Date: 2018-09-04
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on prior experience in the industry, the effective perceived noise level produced by counter-rotating propellers exceeds the noise threshold set by aircraft regulatory agencies, which renders the use of counter-rotating engine systems problematic for commercial application

Method used

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  • Counter-rotating open fan propulsion system
  • Counter-rotating open fan propulsion system
  • Counter-rotating open fan propulsion system

Examples

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Embodiment Construction

[0018] In the following description, numerous specific details are set forth in order to provide a thorough understanding of various embodiments. However, it will be understood by those skilled in the art that various embodiments may be practiced without the specific details. In other instances, well-known methods, procedures, components, and circuits have not been shown or described in detail so as not to obscure the particular embodiments.

[0019] As noted above, counter-rotating engine systems generate significant noise due at least in part to air turbulence caused by the interaction between the two rows of counter-rotating blades. For example, noise is generated when the rear row of blades traverses the low pressure wake created behind the front row of blades.

[0020] Interaction noise typically consists of a tone resonating at the first vane runner frequency or any integer harmonic of this frequency. The ideal blade runner frequency for a counter-rotating propeller ca...

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PUM

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Abstract

In one aspect, a propulsion system includes an engine and a drive assembly coupled to the engine, the drive assembly including a first drive shaft, a first fan, and a clutch assembly, wherein the first drive shaft in a first direction about a first axis is The first fan is rotatably coupled to the first drive shaft for rotation in a first direction, and the clutch assembly selectively disengages the first fan from the first drive shaft. Other aspects can be described.

Description

technical field [0001] The subject matter described herein relates to aircraft propeller systems, and more particularly, those including counter-rotating propeller systems that may be incorporated into aircraft engines. Background technique [0002] Counter-rotating open fan aircraft engines equipped with counter-rotating propeller systems continue to be of interest to the aviation industry due to their efficiency, especially as fuel prices increase. Counter-rotating propeller systems are of particular interest due to their efficiency and ability to generate sufficient thrust at high speeds. [0003] Based on prior experience in the industry, the effective perceived noise level produced by counter-rotating propellers exceeds noise thresholds set by aircraft regulatory agencies, rendering the use of counter-rotating engine systems problematic for commercial application. Accordingly, techniques for reducing noise levels in rotary engine systems would have utility. Contents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64D27/00
CPCF02C6/206F05D2220/325F02C7/36B64C27/10B64C11/48B64D35/06B64D2027/005F16D33/16Y02T50/60B64D35/00B64C27/12B64D35/04F02C3/36B64C11/46F02C3/067
Inventor G·S·希娜D·M·亨特利A·W·布卢姆T·W·埃里克P·R·托雷特
Owner THE BOEING CO