Dynamic stability analysis of pretwisted aerofoil cross-section blade packets under rotating conditions

Şakar, Gürkan; Sabuncu, Mustafa

doi:10.1016/j.ijmecsci.2007.06.001

Cited by 18 publications

(3 citation statements)

References 25 publications

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“…Signi cant in uence on hydrodynamic radial forces and pressure uctuations of the recirculation ow pattern under part-load conditions was reported by the study. Dynamic and static stability of the rotating impeller blade was analyzed for axial periodic force by Sakar and Sabuncu [17]. Blade was found to be more stable for increasing rotational speed and disk radius.…”

Section: Introductionmentioning

confidence: 99%

Design of Mixed Flow Pump Impeller Blade using Mean Stream Line Theory and its Analysis

Zindani

Roy

2018

Scientia Iranica

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Given the importance of blade design in the e ective performance of a mixed ow pump, the present work demonstrates the designing of the mixed ow pump impeller blade using the almost unexplored mean streamline theory. The mean streamline theory, though used sparingly, was found suitable to give comparable results to those of other templates of design. The design process was carried out in AutoCAD 2013 and Solid Works Premium 2014 software. The analysis of equivalent stress, equivalent elastic strain, Total deformation, and the directional deformation was carried out in ANSYS 2014 for di erent construction materials of the blade, i.e., stainless steel, titanium alloy, bronze, and copper alloy. Total deformation was found to be maximum for the impeller blade made from titanium alloy, whereas the equivalent stress and strain was found to be the least for the titanium alloyed impeller blade. Further, a comparison analysis of the equivalent stresses in blade designed was carried out using mean streamline theory and free vortex theory. It was observed that the equivalent stress in impeller blade designed using free vortex theory was lower than that designed using mean streamline theory.

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Section: Introductionmentioning

confidence: 99%

Design of Mixed Flow Pump Impeller Blade using Mean Stream Line Theory and its Analysis

Zindani

Roy

2018

Scientia Iranica

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“…So far, the force mistuning has not been studied yet. For example, in studies [12][13][14][15], pre-twist were all assumed identical.…”

Section: Introductionmentioning

confidence: 99%

Vibration Response Localization of Bladed Disk with Pre-Twist Mistuning

Wang

Cao

2012

AMM

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A new mistuning form, pre-twist mistuning was found in the bladed disk based on the engineering practice. Based on a continuous parameter model of bladed disk, the characteristics of bladed disk with pre-twist mistuning and natural parameters mistuning, including stiffness mistuning, mass mistuning and damping mistuning were compared and analyzed, and the effect of pre-twist mistuning on the vibration response localization of bladed disk was researched. The result shows that pre-twist mistuning can lead vibration response localization to bladed disk as well as natural parameters mistuning. The degree of vibration response localization caused by force mistuning is comparative with the natural parameters mistuning. Compared with natural parameters mistuning, the pre-twist mistuning could not change the natural characteristics of bladed disk. As a result, the pre-twist mistuning can not be detected by traditional method, such as the frequency test. The result not only completed the research content of bladed disk, but also conducted the design and manufacture of bladed disk.

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“…Wagner and Griffin [3][4]utilized the discrete theory to study cyclically symmetric sector model of a blade group on a flexible disk and found that characteristics of the system spectra were dependent on the number of blade groups. The dynamic stability of a rotating pre-twisted asymmetric cross-section blade was investigated analytically [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Influence on Coupling Vibration of Rotor System with Grouped Blades due to Mistuned Lacing Wire

Chiu

Chen

Yang³

2011

AMM

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The influence on coupling vibrations among shaft-torsion and blade-bending coupling vibrations of a rotor system with grouped blades was investigated analytically. The natural frequencies and the mode shapes of the system were solved with five- and six-blade cases used as examples. First, numerical results showed how the natural frequencies varied with the wire stiffness and the lacing wire mistuned. The diagrams of the coupling mode shapes were drawn. From the results, it was found that lacing wire did not affect the SB (shaft-blades) coupling modes, but the BB (inter-blades) modes were indeed affected by the lacing wire. At wire stiffness k*=10, the repeated BB modes split into more distinct modes. The BB modes were of (N-1) / 2 and N / 2 multiplicity for odd and even numbered blades. When the system has a mistuned lacing wire, it splits the BB modes and will once more have (N-1) frequencies. In the rotation effect, whatever tuned or mistuned, the lacing wires did not affect the instability. That means the instability preexisted due to rotation and was not induced by lacing wires.

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Dynamic stability analysis of pretwisted aerofoil cross-section blade packets under rotating conditions

Cited by 18 publications

References 25 publications

Design of Mixed Flow Pump Impeller Blade using Mean Stream Line Theory and its Analysis

Design of Mixed Flow Pump Impeller Blade using Mean Stream Line Theory and its Analysis

Vibration Response Localization of Bladed Disk with Pre-Twist Mistuning

Influence on Coupling Vibration of Rotor System with Grouped Blades due to Mistuned Lacing Wire

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