Details
| Original language | English |
|---|---|
| Article number | 031003 |
| Journal | Journal of turbomachinery |
| Volume | 130 |
| Issue number | 3 |
| Publication status | Published - 2 May 2008 |
Abstract
Nonharmonic acoustic resonance was detected in the static pressure and sound signals in a four-stage high-speed axial compressor when the compressor was operating close to the surge limit. Based on prior research reported in the literature and measurements of the resonance frequency, Mach number of the mean flow, and the axial and circumferential phase shifts of the pressure signal during resonance, it is shown that the acoustic resonance is an axial standing wave of a spinning acoustic mode with three periods around the circumference of the compressor. This phenomenon occurs only if the aerodynamic load in the compressor is high, because the mode needs a high circumferential Mach number for resonance conditions. Mathematics of existing analyses of acoustic resonances in turbomachinery complex and have therefore rarely resulted in published examples of good agreement with real engine data. The present paper provides suitable, physically based simplifications of the existing mathematical models which are applicable for modes with cirrumferential wavelengths of more than two blade pitches and resonance frequencies considerably higher than the rotor speed.
Keywords
- Acoustic resonance, Axial compressor, Cut-off frequency, Mode trapping, Reflection, Rotating instability, Rotating stall, Transmission
ASJC Scopus subject areas
- Engineering(all)
- Mechanical Engineering
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In: Journal of turbomachinery, Vol. 130, No. 3, 031003, 02.05.2008.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Causes of Acoustic Resonance in a High-Speed Axial Compressor
AU - Hellmich, Bernd
AU - Seume, Joerg R.
PY - 2008/5/2
Y1 - 2008/5/2
N2 - Nonharmonic acoustic resonance was detected in the static pressure and sound signals in a four-stage high-speed axial compressor when the compressor was operating close to the surge limit. Based on prior research reported in the literature and measurements of the resonance frequency, Mach number of the mean flow, and the axial and circumferential phase shifts of the pressure signal during resonance, it is shown that the acoustic resonance is an axial standing wave of a spinning acoustic mode with three periods around the circumference of the compressor. This phenomenon occurs only if the aerodynamic load in the compressor is high, because the mode needs a high circumferential Mach number for resonance conditions. Mathematics of existing analyses of acoustic resonances in turbomachinery complex and have therefore rarely resulted in published examples of good agreement with real engine data. The present paper provides suitable, physically based simplifications of the existing mathematical models which are applicable for modes with cirrumferential wavelengths of more than two blade pitches and resonance frequencies considerably higher than the rotor speed.
AB - Nonharmonic acoustic resonance was detected in the static pressure and sound signals in a four-stage high-speed axial compressor when the compressor was operating close to the surge limit. Based on prior research reported in the literature and measurements of the resonance frequency, Mach number of the mean flow, and the axial and circumferential phase shifts of the pressure signal during resonance, it is shown that the acoustic resonance is an axial standing wave of a spinning acoustic mode with three periods around the circumference of the compressor. This phenomenon occurs only if the aerodynamic load in the compressor is high, because the mode needs a high circumferential Mach number for resonance conditions. Mathematics of existing analyses of acoustic resonances in turbomachinery complex and have therefore rarely resulted in published examples of good agreement with real engine data. The present paper provides suitable, physically based simplifications of the existing mathematical models which are applicable for modes with cirrumferential wavelengths of more than two blade pitches and resonance frequencies considerably higher than the rotor speed.
KW - Acoustic resonance
KW - Axial compressor
KW - Cut-off frequency
KW - Mode trapping
KW - Reflection
KW - Rotating instability
KW - Rotating stall
KW - Transmission
UR - http://www.scopus.com/inward/record.url?scp=49049083550&partnerID=8YFLogxK
U2 - 10.1115/1.2775487
DO - 10.1115/1.2775487
M3 - Article
AN - SCOPUS:49049083550
VL - 130
JO - Journal of turbomachinery
JF - Journal of turbomachinery
SN - 0889-504X
IS - 3
M1 - 031003
ER -