H. Honen et He. Gallus, MONITORING OF AERODYNAMIC LOAD AND DETECTION OF STALL IN MULTISTAGE AXIAL COMPRESSORS, Journal of turbomachinery, 117(1), 1995, pp. 81-86
The unsteady flow in a single-stage axial flow compressor at different
operating conditions has been investigated with hot-wire and hot-film
probes to find out the influence of the aerodynamic compressor load o
n the periodic fluctuations. These results are compared with measureme
nts in the last stages of a multistage high-pressure compressor of a g
as turbine for normal operation and under stall conditions. From the p
atterns of the frequency spectra of the measuring signals a parameter
for the detection of the approach to the stability line of a compresso
r is derived. A method for the on-line monitoring of the aerodynamic l
oad is presented. Based on these results a monitoring system has been
developed. First experiences with this system, applied to two multista
ge compressors, are reported.