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Stall inception identification method of axial-flow compressor

An identification method and compressor technology, applied in mechanical equipment, non-variable pumps, machines/engines, etc., can solve problems such as component damage, compressor performance deterioration, and severe vibration of compressor blades

Inactive Publication Date: 2013-07-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0002] Stall and surge are serious issues limiting the design of high performance gas turbine compressors
Because the stall and surge not only greatly deteriorate the performance of the compressor, but more seriously, cause the blades of the compressor to vibrate violently so that the blades break and cause component damage

Method used

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  • Stall inception identification method of axial-flow compressor
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  • Stall inception identification method of axial-flow compressor

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Embodiment Construction

[0022] The present invention will be further explained below in conjunction with the accompanying drawings.

[0023] The present invention is a stall warning method for an axial flow compressor. One or more sensors are arranged in the circumferential direction of the impeller of the compressor to detect pulse pressure signals at individual positions, and the obtained signals are analyzed to obtain the adjacent period of the compressor rotor. The change of the correlation coefficient of , so as to accurately reflect the stall precursor.

[0024] The following combination figure 1 The concrete steps of implementation method of the present invention are described in detail, and this method comprises the following steps:

[0025] 1. Perform SWT (Stationary Wavelet Transform; smooth wavelet transform) band-selective filtering on the pulse pressure signal measured by one sensor or one of multiple sensors installed in the compressor

[0026] Since SWT does not perform down-sampling...

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Abstract

The invention provides a stall inception identification method of an axial-flow compressor. Firstly, the pulsating pressure signal of the axial-flow compressor is subjected to band selection and filtering through a stationary wavelet transform; and secondly, the correlation between the filtered pulsating pressure signal at a rotor period and the signal at a previous rotor period is compared, and a cross correlation coefficient is calculated. Through monitoring the change of the cross correlation coefficient, a stall inception characteristic can be effectively identified and monitored, and the aim of stall early warning is achieved.

Description

technical field [0001] The invention belongs to the technical field of axial-flow compressors, and in particular relates to a stall warning identification method of an axial-flow compressor. Background technique [0002] Stall and surge are serious problems that limit the design of high performance gas turbine compressors. Because the stall and surge not only greatly deteriorate the performance of the compressor, but more seriously cause the blades of the compressor to vibrate violently so that the blades break and cause component damage. [0003] The stall precursor of the compressor refers to the airflow disturbance phenomenon related to the stall that appears before the compressor completely enters the stall. This kind of disturbance is different from the air flow when the compressor works in a steady state and when it is stalled. The general performance is that the pressure and amplitude increase and the frequency component changes. [0004] There are two typical types...

Claims

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Application Information

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IPC IPC(8): F04D27/00
Inventor 岳林李俊虎王德友
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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