Detection of Stall Region during Testing of Compressor
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2015, Vol 5, Issue 2
Abstract
Most of the algorithms for anti surge control for industrial centrifugal compressor work on the data taken from various process parameters . In recent years , some more works have been done to co- relate the compressor stall / surge with machinery vibrations. These features have been applied in some compressor control PLC as well. Compressor stalls are aerodynamic stalls which can result to reduced compression efficiency or complete breakdown in compression. Stall is normally a precursor to surge which cause radial vibration at certain frequencies .Pure surge, on the other hand, is an axisymmetric oscillation of the mass row along the axial length of the compressor. It is more severe than rotating stall and may cause severe damage to compressor. For high speed , high pressure centrifugal compressor, it is imprative to conduct a ASME PTC10 type 1 test before equipment is towed out. For high pressure centrifugal compressor, aerodyanmics induced vibration may lead to Resizing diffuser and return channelleading to enormous delay if issue is not identified at OEM ( Original equipment manufacturer ) test bench itself .This paper provides a road map to draw a surge limit line and locating stall region in compressor map which can help deriving a Real Surge Precursor Algorithm based on vibration and dynmaic pressure analysis at OEM works . These can be used also as a part of diagnostic tool to identify the real source of sub synchronous vibration.
Authors and Affiliations
Mantosh Bhattacharya
Keywords
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