Investigation of non-synchronous vibration mechanism for a high speed axial compressor using delayed DES

Hong Sik Im, GeCheng Zha

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper uses the delayed detached eddy simulation (DDES) of turbulence to investigate the mechanism of non-synchronous vibration (NSV) of a multistage high speed axial compressor. DDES is a hybrid model for turbulence simulation, which uses RANS model within the wall boundary layer and uses large eddy simulation outside of the wall boundary layer. Time accurate Navier-Stokes equations are solved with a 3rd order WENO reconstruction for the inviscid flux and a 2nd order central differencing for the viscous terms. A fully conservative rotor/stator sliding BC is used to resolve the unsteady interaction between the rotor and the stationary blades. A 1/7th annulus sector is employed with the time shifted phase lag BC at the circumferential boundaries. The DDES shows that the NSV of the compressor occurs due to the rotating flow instability in the vicinity of the rotor tip at a stable operation condition. The tornado-like tip vortex causes the NSV of the rotor blades as it propagates to the next blade passage in the counter rotating direction above 80% rotor span. The tornado vortex travels fast on the suction surface of the blade and stays relatively longer at the passage outlet crossing to the next blade leading edge. Such a tornado vortex motion trajectory generates two low pressure regions due to the vortex core positions, one at the leading edge and one at the trailing edge, both are oscillating due to the vortex coming and leaving. These two low pressure regions create a pair of coupling forces that generates a torsion moment causing NSV.

Original languageEnglish (US)
Title of host publication52nd Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102561
StatePublished - 2014
Event52nd Aerospace Sciences Meeting 2014 - National Harbor, United States
Duration: Jan 13 2014Jan 17 2014

Other

Other52nd Aerospace Sciences Meeting 2014
CountryUnited States
CityNational Harbor
Period1/13/141/17/14

Fingerprint

Compressors
Vortex flow
Tornadoes
Rotors
Turbomachine blades
Boundary layers
Turbulence
Large eddy simulation
Torsional stress
Navier Stokes equations
Stators
Trajectories
Fluxes

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Im, H. S., & Zha, G. (2014). Investigation of non-synchronous vibration mechanism for a high speed axial compressor using delayed DES. In 52nd Aerospace Sciences Meeting American Institute of Aeronautics and Astronautics Inc..

Investigation of non-synchronous vibration mechanism for a high speed axial compressor using delayed DES. / Im, Hong Sik; Zha, GeCheng.

52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc., 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Im, HS & Zha, G 2014, Investigation of non-synchronous vibration mechanism for a high speed axial compressor using delayed DES. in 52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc., 52nd Aerospace Sciences Meeting 2014, National Harbor, United States, 1/13/14.
Im HS, Zha G. Investigation of non-synchronous vibration mechanism for a high speed axial compressor using delayed DES. In 52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc. 2014
Im, Hong Sik ; Zha, GeCheng. / Investigation of non-synchronous vibration mechanism for a high speed axial compressor using delayed DES. 52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc., 2014.
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AB - This paper uses the delayed detached eddy simulation (DDES) of turbulence to investigate the mechanism of non-synchronous vibration (NSV) of a multistage high speed axial compressor. DDES is a hybrid model for turbulence simulation, which uses RANS model within the wall boundary layer and uses large eddy simulation outside of the wall boundary layer. Time accurate Navier-Stokes equations are solved with a 3rd order WENO reconstruction for the inviscid flux and a 2nd order central differencing for the viscous terms. A fully conservative rotor/stator sliding BC is used to resolve the unsteady interaction between the rotor and the stationary blades. A 1/7th annulus sector is employed with the time shifted phase lag BC at the circumferential boundaries. The DDES shows that the NSV of the compressor occurs due to the rotating flow instability in the vicinity of the rotor tip at a stable operation condition. The tornado-like tip vortex causes the NSV of the rotor blades as it propagates to the next blade passage in the counter rotating direction above 80% rotor span. The tornado vortex travels fast on the suction surface of the blade and stays relatively longer at the passage outlet crossing to the next blade leading edge. Such a tornado vortex motion trajectory generates two low pressure regions due to the vortex core positions, one at the leading edge and one at the trailing edge, both are oscillating due to the vortex coming and leaving. These two low pressure regions create a pair of coupling forces that generates a torsion moment causing NSV.

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