Abstract
Nowadays, anti-surge protection system based on parametric method is widely used. The disadvantage of this anti-surge system is the fact that it is not possible to fully ensure the safe operation of the compressor at low flow conditions, because large measurement error will occur. Other method of anti-surge protection is indicative method. This method is what it is necessary to detect occurrence of rotating stall in time on the score of information criterion. Further the control decision is accepted in connection with the approach to the danger zone of surge. Indicative method is more complicated and requires special signal analysis such as wavelet analysis, correlation analysis. Also in addition to the methods of analysis, important is the length of the sample for processing unsteady pressure fluctuations and the method of its displacement on time. It is now possible to mathematically pre-simulate unsteady processes in the flow part of centrifugal compressor.
Highlights
The area of operation of centrifugal compressors is strictly limited to the minimum consumption at a fixed rotation frequency, this is due to the presence of surging, which is not permissible in the normal operation of a centrifugal compressor
3.1 The development of a centrifugal compressor protection system against surging with a featuring method based on numerical simulation
An important feature of the simulation of non-stationary processes in a centrifugal compressor is the need for calculations in the 360 degree on a circle, since a replacement in a sector leads to a distortion of the results obtained and is not correct from the standpoint of the physics of the nonstationary process
Summary
The area of operation of centrifugal compressors is strictly limited to the minimum consumption at a fixed rotation frequency, this is due to the presence of surging, which is not permissible in the normal operation of a centrifugal compressor. The boundary of the beginning of surging is determined by the shape of the characteristics of the compressor and the network, and, as a rule, is located in the area of costs lower than the boundary of the phenomenon of rotating stall. 1.1 Classical system of compressor protection against surging. The basic, existing, way of protecting centrifugal compressors from surging is the parametric method. Another way is developing - it is a featuring method [1]
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