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)
