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Method and system for air compressor rotating stall predication based on first-order modal amplitude slope

A prediction method and technology of rotating stall, which is applied in the fields of instrumentation, calculation, electrical digital data processing, etc., can solve the problems such as the difficulty of rotating stall control, and achieve the effects of fast calculation speed, avoiding loss, and small calculation amount

Inactive Publication Date: 2013-07-10
PEKING UNIV
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Problems solved by technology

[0006] Aiming at the difficulty of rotating stall control, the present invention proposes a method of predicting in advance, which solves the problem of controlling the compressor after it enters the rotating stall

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  • Method and system for air compressor rotating stall predication based on first-order modal amplitude slope
  • Method and system for air compressor rotating stall predication based on first-order modal amplitude slope
  • Method and system for air compressor rotating stall predication based on first-order modal amplitude slope

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing, the present invention will be further described by examples.

[0037] Such as figure 1 As shown, the system adopted in the present invention includes: N dynamic pressure sensors T1~TN, N data processing systems A / D, N hotlines HL1~HLN, and central processing unit CPU; wherein, among the N dynamic pressure sensors Each of them is respectively connected to the data processing system; the N data processing systems are connected to the central processing unit; the N hot lines are connected to the central processing unit.

[0038] In the present embodiment, adopt 5 sensors, the angle between every adjacent two sensors is 72 °, and the setting of sensor is as follows figure 2 shown.

[0039] A method for predicting the rotating stall of a compressor based on the slope of the first-order modal amplitude in this embodiment, such as image 3 shown, including the following steps:

[0040] 1) Sensors collect pressure signals: in...

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Abstract

The invention discloses a method and a system for air compressor rotating stall predication based on first-order modal amplitude slope. Sensors arranged on a wall surface of an air compressor are used for acquiring pressure signals, the pressure signals are converted into digital signals, a central processor obtains flow distribution according to pressure distribution and analyzes to obtain a first-order modal to further obtain a predictive index, the predictive index is compared with a threshold to judge whether rotating stall occurs or not, and accordingly rotating stall is predicated in advance. The method and the system are simple in device, easy to implement, small in computational amount, high in speed and applicable to various working conditions, reduce complexity of independent processing of each working condition and have theoretical bases, a warning signal is sent out before rotating stall so as to achieve advance control, the problem of difficulty in rotating stall control is solved, and accordingly loss is avoided.

Description

technical field [0001] The invention relates to the field of aviation turbofan engines, in particular to a compressor rotation stall prediction method and system based on the first-order modal amplitude slope. Background technique [0002] The aero engine is known as the "heart" of the aircraft. Without high-performance aero engines, there will be no advanced military aircraft and commercially competitive civilian airliners. In the field of aero-engines, there is still a generation gap between my country and the developed aviation powers, and there is still a considerable gap in various performance indicators such as reliability, stability and efficiency. [0003] Rotating stall is one of the systematic instabilities of engine internal flow, which limits the stable operating region of the engine. The engine includes an air inlet, a compressor, a swirl and an air outlet. Rotating stall is a state of non-uniform axial flow along the circumference of the compressor, while its...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 董万静王勇
Owner PEKING UNIV
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