Flow control method in large expansion angle channel

A technology of flow control and expansion angle, applied in the direction of engine components, machines/engines, stators, etc., can solve the problems of engine weight increase, achieve the effects of reducing axial size and weight, enhancing stability, and improving efficiency

Inactive Publication Date: 2009-12-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Designers have to increase the axial size of the transition section and the turbine to meet the requirements of the radius and blade height of the low-pressure turbine, which will bring another difficult problem to the designer—the increase in engine weight

Method used

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  • Flow control method in large expansion angle channel
  • Flow control method in large expansion angle channel
  • Flow control method in large expansion angle channel

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Embodiment Construction

[0020] The control method of the present invention can be used for the flow control of various fluid machines including aeroengines, gas turbines and other impeller machines and expansion passages inside pipelines.

[0021] Such as Figure 2a-2d and image 3 As shown, in the embodiment of the present invention, a flow guide ring 7 or a flow guide plate 8 is arranged in the expansion channel, that is, between the flow channel outer wall 4 and the flow channel inner wall 5, or a flow guide ring 7 and a flow guide plate 8 are arranged at the same time, Divide the deflector ring 7 into a plurality of segments in the circumferential direction, and one or more segments constitute the deflector 8 . The guide ring 7 or the guide plate 8 is fixed by the support plate 6 . When the expansion angle of the channel is not very large, there is obvious secondary flow in the flow channel, but there is no recirculation zone or the size of the recirculation zone is small, then the deflector pl...

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PUM

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Abstract

A flow control method in a large expansion angle channel comprises that in a divergent channel, a guide ring (7) or a guide plate (8) is arranged between a runner outer wall (4) and a runner inner wall (5) or both are arranged, the guide ring (7) is divided into a plurality of parts in the circumferential direction and the guide plate (8) is composed of one or more parts. The invention can not only increase the expansion angle of a runner but also improve the flow control, thus improving the pneumatic performance of a large bypass ratio turbofan engine and reducing the axial dimension and weight.

Description

technical field [0001] The present invention relates to a flow control method in a channel with a large divergence angle that can be widely used, in particular to a flow control method in a transition section with a large divergence angle in an aero-engine or a gas turbine and a flow control method in a turbine guide channel; the present invention also relates to using the method The designed expansion flow channel and various mechanical devices containing the flow channel. Background technique [0002] For a long time to come, turbofan engines with high bypass ratios will still be the only choice for powering large passenger aircraft. The thrust generated by the fan of a turbofan engine with a large bypass ratio accounts for 60%-80% of the total thrust of the engine. Therefore, keeping the low-pressure turbine that drives the fan working at a high efficiency state is the most important for a civil engine with a large bypass ratio. Critical. [0003] At present, the bypass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/04
Inventor 叶建张伟昊邹正平刘火星
Owner BEIHANG UNIV
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