Publication Date

4-2020

Department

Ames Laboratory; Mechanical Engineering

Campus Units

Ames Laboratory, Mechanical Engineering

OSTI ID+

1591617

Report Number

IS-J 10122

DOI

10.1115/1.4045218

Journal Title

Journal of Engineering for Gas Turbines and Power

Volume Number

142

Issue Number

4

First Page

041026

Abstract

Compressor dynamics were studied in a gas turbine—fuel cell hybrid power system having a larger compressor volume than traditionally found in gas turbine systems. This larger compressor volume adversely affects the surge margin of the gas turbine. Industrial acoustic sensors were placed near the compressor to identify when the equipment was getting close to the surge line. Fast Fourier transform (FFT) mathematical analysis was used to obtain spectra representing the probability density across the frequency range (0–5000 Hz). Comparison between FFT spectra for nominal and transient operations revealed that higher amplitude spikes were observed during incipient stall at three different frequencies, 900, 1020, and 1800 Hz. These frequencies were compared to the natural frequencies of the equipment and the frequency for the rotating turbomachinery to identify more general nature of the acoustic signal typical of the onset of compressor surge. The primary goal of this acoustic analysis was to establish an online methodology to monitor compressor stability that can be anticipated and avoided.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

42 ENGINEERING

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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