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research-article

EXPERIMENTAL INVESTIGATION OF VIBRATIONAL AND ACOUSTIC PHENOMENA FOR DETECTING THE STALL AND SURGE OF A MULTISTAGE COMPRESSOR

[+] Author and Article Information
Enrico Munari

Dipartimento di Ingegneria, Università degli Studi di Ferrara, 44122 Ferrara, Italy
enrico.munari@unife.it

Gianluca Delia

Dipartimento di Ingegneria, Università degli Studi di Ferrara, 44122 Ferrara, Italy
gianluca.delia@unife.it

Mirko Morini

Dipartimento di Ingegneria Industriale, Università degli Studi di Parma, 43121 Parma, Italy
mirko.morini@unipr.it

Emiliano Mucchi

Dipartimento di Ingegneria, Università degli Studi di Ferrara, 44122 Ferrara, Italy
mccmln@unife.it

Michele Pinelli

Dipartimento di Ingegneria, Università degli Studi di Ferrara, 44122 Ferrara, Italy
michele.pinelli@unife.it

Pier Ruggero Spina

Dipartimento di Ingegneria, Università degli Studi di Ferrara, 44122 Ferrara, Italy
pier.ruggero.spina@unife.it

1Corresponding author.

ASME doi:10.1115/1.4038765 History: Received August 10, 2017; Revised October 22, 2017

Abstract

Nowadays, the operative range limit of compressors is still a key aspect of the research into turbomachinery. In particular, the study of the mass flow rate lower limit represents a significant factor in order to predict and avoid the inception of critical working conditions and instabilities such as stall and surge. The identification of the typical precursors of these two phenomena can imply many advantages, in both stationary and aeronautic applications, such as avoiding the loss of production (in industry) and efficiency of systems, and reducing the maintenance and repairing cost. Many approaches can be adopted to achieve this target, but one of the most fascinating is the vibro-acoustic analysis of the compressor response during operation. At the Engineering Department of the University of Ferrara, a test bench, dedicated to the study of the performance of an aeronautic turboshaft engine multistage compressor, has been equipped with a high frequency data acquisition system. A set of triaxle accelerometers and microphones, suitable for capturing broad-band vibration and acoustic phenomena, were installed in strategic positions along the compressor and the test rig. A great amount of vibro-acoustic data were firstly processed through an innovative data analysis technique, and then correlated to the thermodynamic data recorded. Subsequently, the precursor signals of stall and surge were detected and identified demonstrating the reliability of the methodology used for studying compressor instabilities. The experimental data offer a valid alternative way of analyzing and detecting unstable compressor behavior characteristics by means of non-intrusive measurements.

Copyright (c) 2017 by ASME
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