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Method and device for determining an indicator for a prediction of an instability in a compressor and use thereof

A technology in instability and compressors, applied in mechanical equipment, engine control, machine/engine, etc., can solve problems such as expensive and failure

Active Publication Date: 2019-10-25
TECHNICAL UNIVERSITY OF BERLIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, costly total failure of the compressor under test is accepted when determining the surge limit in the prior art

Method used

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  • Method and device for determining an indicator for a prediction of an instability in a compressor and use thereof
  • Method and device for determining an indicator for a prediction of an instability in a compressor and use thereof
  • Method and device for determining an indicator for a prediction of an instability in a compressor and use thereof

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Experimental program
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Embodiment Construction

[0029] Other embodiments are explained below with reference to the drawings. In the attached picture:

[0030] figure 1 A schematic diagram showing the arrangement of a test rig for testing axial compressors;

[0031] figure 2 A schematic diagram of an axial compressor is shown in cross-section;

[0032] image 3 A schematic diagram of a radial compressor is shown in cross-section;

[0033] Figure 4 shows a graphical representation of the course of the curve for the operating state of the compressor, where the skewness is plotted on the flow coefficient;

[0034] Figure 5 shows a graphical representation of the operating conditions at a rotational speed of 5500 revolutions per minute, where skewness is depicted on the flow coefficient; and

[0035] Figure 6 A graphical representation of the operating conditions at a rotational speed of 9000 revolutions per minute is shown, in which the skewness is plotted on the flow coefficient.

[0036] figure 1 A schematic di...

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Abstract

The invention relates to a method for determining an indicator for a prediction of an instability in a compressor, which is designed as an axial or radial compressor, having the following steps: operating a compressor designed as an axial or radial compressor in operating states, which differ by different values of a characteristic parameter for a flow mass flux of the compressor, wherein the operating states are run through at decreasing flow mass fluxes; determining the values of the characteristic value for the flow mass flux for the operating states; detecting time-resolved pressure measurement values when running through the operating states by means of a pressure sensor (6), which is arranged in a housing of the compressor, upstream adjacent to an entrance plane of a rotor stage (2);determining the skew for the operating states and determining an indicator for an instability of the compressor, if an algebraic sign change of the curve rise is determined for a curve profile of theskew over the characteristic parameter for the flow mass flux for the operating states. The invention further relates to the use of the method and a device for determining an indicator for a prediction of an instability in an compressor.

Description

[0001] The invention relates to a method and a device for determining indicators for predicting instability in compressors and their use. Background technique [0002] Heat turbines can be implemented as axial or radial compressors. [0003] For example, axial compressors represent key components in aircraft drives. In this or other configurations it is difficult to predict the operational behavior of the compressor. Therefore, the performance data of the newly developed compressors are measured on the test bench and then entered into the characteristic curve. The so-called surge limit is an important part of the characteristic curve. When the surge limit is exceeded, instabilities arise in the compressor, which can result in extremely high aerodynamic loads on the compressor and can cause serious structural damage. Knowledge of the surge limit is very important in order to be able to ensure reliable operation of the corresponding compressor. On the test bench, however, th...

Claims

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Application Information

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IPC IPC(8): F04D27/00
CPCF04D27/001F04D27/0261F05D2270/101
Inventor 马里奥·埃克迪埃特尔·派特斯奇
Owner TECHNICAL UNIVERSITY OF BERLIN
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