Vibration of Circular Bladed Disk With Imperfections

Půst, L.; Pešek, Luděk

doi:10.1142/s0218127411030210

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…This experimental work is closely linked to the project dealing with aeroelastic couplings and dynamic behaviour of rotational periodic bodies [5,6]. Vimmr et al [5] carried out a numerical study which uses a simplified model of blade cascade (3 airfoils) which perform harmonic motion and with individual inter-blade phase angle.…”

Section: Introductionmentioning

confidence: 99%

On the effect of moving blade grid on the flow field characteristics

et al. 2018

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The motivation of this paper is the continual development of the blades for the last stage of the steam turbine. The biggest problem is the slenderness of such blades and the extreme sensitivity to aeroelastic vibrations (flutter) caused by the instabilities present in the flow. This experimental research is dealing with the aeroelastic binding of the moving blades located in the blade grid with the flow field and vice versa. A parallelogram is used to ensure one order of freedom of the blade. The grid has five blades in total, three of them are driven by force control using three shakers. The deviation as well as force response is measured by strain gauges and dynamometers. The flow field statistical as well as dynamical characteristics are measured by optical method Particle Image Velocimetry. The grid is connected to the blow-down wind tunnel with velocity range up to 40 m/s. The aeroelastic binding is investigated in dependency on used actuation frequency and maximal amplitude (the intensity of force actuation) and on different Reynolds numbers. The flow field and the wake behind each individual blade are studied and the maximal interaction is examined for individual inter-blade phase angle of the grid.

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Section: Introductionmentioning

confidence: 99%

On the effect of moving blade grid on the flow field characteristics

et al. 2018

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“…[4] revealed that the flow is mainly affected by the changing wing angle and the effect of displacement is rather small. This experimental work is closely linked to the project dealing with aeroelastic couplings and dynamic behaviour of rotational periodic bodies [5,6]. Vimmr et al [5] carried out a numerical study which uses a simplified model of blade cascade (3 airfoils) which perform harmonic motion and with individual inter-blade phase angle.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this study is to determine the aerodynamic damping coefficients caused by the aerodynamic forces acting on the flat plates. Půst et al [6] has described analytically the dynamic properties of the five-blade-cascade excited by the running harmonic external forces and aerodynamic selfexcited forces were investigated.…”

Section: Introductionmentioning

confidence: 99%

On the effect of moving blade grid on the flow field characteristics

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract. The motivation of this paper is the continual development of the blades for the last stage of the steam turbine. The biggest problem is the slenderness of such blades and the extreme sensitivity to aeroelastic vibrations (flutter) caused by the instabilities present in the flow. This experimental research is dealing with the aeroelastic binding of the moving blades located in the blade grid with the flow field and vice versa. A parallelogram is used to ensure one order of freedom of the blade. The grid has five blades in total, three of them are driven by force control using three shakers. The deviation as well as force response is measured by strain gauges and dynamometers. The flow field statistical as well as dynamical characteristics are measured by optical method Particle Image Velocimetry. The grid is connected to the blow-down wind tunnel with velocity range up to 40 m/s. The aeroelastic binding is investigated in dependency on used actuation frequency and maximal amplitude (the intensity of force actuation) and on different Reynolds numbers. The flow field and the wake behind each individual blade are studied and the maximal interaction is examined for individual inter-blade phase angle of the grid.

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“…Zinkovskii and Kruglii [16] used FEM to investigate the effect of possible identity violations of contact interaction between shrouds on the static stress state characteristics of blades. Pust and Pesek [17] investigated the response of circular bladed disk with shrouds. They found that the high of resonance peaks is strongly affected by the nonproportional distribution of damping.…”

Section: Introductionmentioning

confidence: 99%

Based on lacing wires influence of coupling vibration of a multi flexible disks turbine rotor system by two methods

Chiu¹,

Yang²,

Yu³

2017

J. vibroeng.

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This paper explored the blade-bending, disk-transverse and shaft-torsion coupling vibrations phenomenon of a multi flexible disc rotor system, whose blades subsystem was grouped with spring. Being different from the author's previous researches, here we used two methods: one is the assumed mode method (AMM) and the other is the finite element method (FEM), the proposed former one is main, and the latter one is complementary. Then compared the two results generated from them. According to the authors' previous definition, a flexible disc rotor system displays three coupling vibrations' types, inter-blade (BB), shaft-disk-blade (SDB) and disk-blade (DB) modes. In this paper, the authors additionally defined two new types, which were called lacing wires-blade (LB) and lacing wires-disk-blade (LDB) mode. The system change rules of natural frequencies and that of mode shapes would be discussed. Some interesting results are shown in this paper. Firstly, the author pointed out the change rules of the mode shapes and natural frequencies by using the AMM and FEM (including three kinds of softwares). Secondly, numerical calculation results also showed that the distance of disk, the disk with flexible, the constant of spring, and location of spring four phenomena would affect the natural frequencies.

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Vibration of Circular Bladed Disk With Imperfections

Cited by 11 publications

References 5 publications

On the effect of moving blade grid on the flow field characteristics

On the effect of moving blade grid on the flow field characteristics

On the effect of moving blade grid on the flow field characteristics

Based on lacing wires influence of coupling vibration of a multi flexible disks turbine rotor system by two methods

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