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Method and apparatus for determining indicators for predicting instability in compressors and use thereof

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

Active Publication Date: 2020-12-08
TECH UNIV 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 apparatus for determining indicators for predicting instability in compressors and use thereof
  • Method and apparatus for determining indicators for predicting instability in compressors and use thereof
  • Method and apparatus for determining indicators for predicting instability in compressors 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 indicators for predicting instabilities in a compressor which is implemented as an axial or radial compressor, the method having the following steps; Compressors of type or radial compressors, these operating states are distinguished by different values ​​of the characteristic variable of the through-flow mass flow of the compressor, wherein an operating state with a reduced through-flow mass flow is experienced here; these operating states are determined Values ​​of the characteristic values ​​of the through-flow mass flow; during these operating states, time-resolved pressure measurements are recorded by means of a pressure sensor (6) arranged in the compressor housing at the rotor stage (2) Adjacent to it upstream of the inlet plane; determine the skewness of these operating states and when the curve trend of this skewness determines the sign change of the slope of the curve for the characteristic variable of the through-flow mass flow in these operating states, determine for An indicator of the instability of the compressor. Furthermore, the use of the method and a device for determining indicators for predicting instability in compressors are proposed.

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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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00
CPCF04D27/001F04D27/0261F05D2270/101
Inventor 马里奥·埃克迪埃特尔·派特斯奇
Owner TECH UNIV BERLIN
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