Damping Characteristics of Non-Synchronous Turbine Blade Vibration

Akiyama, Ryou; Shiohata, Koki; Nakajima, Tomomi; Yamashita, Yutaka

doi:10.1115/detc2015-46416

Cited by 2 publications

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“…Based on the principle of energy transport, blade vibration with an input motion is applied by Spiker et al [ 9 ]. Blade mode damping is taken into consideration [ 10 ]. The limit cycle oscillation (LCO) is determined with a negative damping.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Mechanism and Parametric Description of Non-Synchronous Blade Vibration

Zhang

Hou

Han

2021

Entropy

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In order to explore the mechanism during the process of the non-synchronous vibration (NSV), the flow field formation development is investigated in this paper. Based on the fluid–structure interaction method, the vibration of rotor blades is found to be in the first bending mode with a non-integral order (4.6) of the rotation speed. Referring to the constant inter blade phase angle (IBPA), the appearances of frequency-locking and phase-locking can be identified for the NSV. A periodical instability flow emerges in the tip region with the mixture of separation vortex and tip leakage flow. Due to the nonlinearities of fluid and structure, the blade vibration exhibits a limit cycle oscillation (LCO) response. The separation vortex presenting a spiral structure propagates in the annulus, indicating a pattern as modal oscillation. A flow induced vibration is initiated by the spiral vortex in the tip. The large pressure oscillation caused by the movement of the spiral vortex is regarded as a main factor for the presented NSV. As the oscillation of blade loading occurs with blade rotating pass the disturbances, the intensity of the reverse leakage flow in adjacent channels also plays a crucial role in the blade vibration.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Mechanism and Parametric Description of Non-Synchronous Blade Vibration

Zhang

Hou

Han

2021

Entropy

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“…With the understanding of the non-synchronous vibration of the compressor blade, it is mostly considered that the aerodynamic flow instability caused by the leakage vortex in the tip region is accounted for by this phenomenon [ 20 ]. Blade mode damping is also taken into consideration [ 21 ]. Blade non-synchronous vibration in a transonic compressor was observed by Moller et al [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Flow Field Entropy Structure of Non-Synchronous Blade Vibration in an Axial Turbocompressor

Zhang

Hou

2020

Entropy

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In order to explore the inducing factors and mechanism of the non-synchronous vibration, the flow field structure and its formation mechanism in the non-synchronous vibration state of a high speed turbocompressor are discussed in this paper, based on the fluid–structure interaction method. The predicted frequencies fBV (4.4EO), fAR (9.6EO) in the field have a good correspondence with the experimental data, which verify the reliability and accuracy of the numerical method. The results indicate that, under a deviation in the adjustment of inlet guide vane (IGV), the disturbances of pressure in the tip diffuse upstream and downstream, and maintain the corresponding relationship with the non-synchronous vibration frequency of the blade. An instability flow that developed at the tip region of 90% span emerged due to interactions among the incoming main flow, the axial separation backflow, and the tip leakage vortices. The separation vortices in the blade passage mixed up with the tip leakage flow reverse at the trailing edge of blade tip, presenting a spiral vortex structure which flows upstream to the leading edge of the adjacent blade. The disturbances of the spiral vortexes emerge to rotate at 54.5% of the rotor speed in the same rotating direction as a modal oscillation. The blade vibration in the turbocompressor is found to be related to the unsteadiness of the tip flow. The large pressure oscillation caused by the movement of the spiral vortex is regarded as the one of the main drivers for the non-synchronous vibration for the present turbocompressor, besides the deviation in the adjustment of IGV.

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Damping Characteristics of Non-Synchronous Turbine Blade Vibration

Cited by 2 publications

References 0 publications

Investigation on the Mechanism and Parametric Description of Non-Synchronous Blade Vibration

Investigation on the Mechanism and Parametric Description of Non-Synchronous Blade Vibration

Investigation on the Flow Field Entropy Structure of Non-Synchronous Blade Vibration in an Axial Turbocompressor

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