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    An Efficient Aeroelastic Eigenvalue Method for Analyzing Coupled-Mode Flutter in Turbomachinery

    Source: Journal of Turbomachinery:;2021:;volume( 143 ):;issue: 002::page 021010-1
    Author:
    Huang, Huang
    ,
    Liu, Wei
    ,
    Petrie-Repar, Paul
    ,
    Wang, Dingxi
    DOI: 10.1115/1.4048294
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In this paper, a method for analyzing flutter for a turbomachinery row with aerodynamically coupled structural modes is presented. The majority of observed turbomachinery flutter incidents involve only one structural mode family due to high mass ratio, high solidity and significant natural frequency separation for blades of traditional design. However, with the trend of higher aerodynamic loading, the wide usage of light weight composite materials and lower blade counts, the likelihood of coupled-mode flutter increases, particularly for turbofans or open rotors. Under such circumstances, the widely used energy method for flutter analysis is not valid. To model this situation, a novel aeroelastic eigenvalue method that is capable of modeling both single- and coupled-mode flutter is proposed. This method takes into account the aerodynamic coupling effects between different vibration modes through the influence coefficient cross sub-matrices, which can be efficiently computed by a harmonic balance solver. The new method is efficient as the required computational effort is only two times that of the traditional single mode analysis approach. The new method is demonstrated and validated by presenting results for Standard Configuration Eleven and NASA Rotor 67 flutter test cases in this paper.
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      An Efficient Aeroelastic Eigenvalue Method for Analyzing Coupled-Mode Flutter in Turbomachinery

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4276957
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    contributor authorHuang, Huang
    contributor authorLiu, Wei
    contributor authorPetrie-Repar, Paul
    contributor authorWang, Dingxi
    date accessioned2022-02-05T22:07:23Z
    date available2022-02-05T22:07:23Z
    date copyright2/2/2021 12:00:00 AM
    date issued2021
    identifier issn0889-504X
    identifier otherturbo_143_2_021010.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4276957
    description abstractIn this paper, a method for analyzing flutter for a turbomachinery row with aerodynamically coupled structural modes is presented. The majority of observed turbomachinery flutter incidents involve only one structural mode family due to high mass ratio, high solidity and significant natural frequency separation for blades of traditional design. However, with the trend of higher aerodynamic loading, the wide usage of light weight composite materials and lower blade counts, the likelihood of coupled-mode flutter increases, particularly for turbofans or open rotors. Under such circumstances, the widely used energy method for flutter analysis is not valid. To model this situation, a novel aeroelastic eigenvalue method that is capable of modeling both single- and coupled-mode flutter is proposed. This method takes into account the aerodynamic coupling effects between different vibration modes through the influence coefficient cross sub-matrices, which can be efficiently computed by a harmonic balance solver. The new method is efficient as the required computational effort is only two times that of the traditional single mode analysis approach. The new method is demonstrated and validated by presenting results for Standard Configuration Eleven and NASA Rotor 67 flutter test cases in this paper.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAn Efficient Aeroelastic Eigenvalue Method for Analyzing Coupled-Mode Flutter in Turbomachinery
    typeJournal Paper
    journal volume143
    journal issue2
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4048294
    journal fristpage021010-1
    journal lastpage021010-12
    page12
    treeJournal of Turbomachinery:;2021:;volume( 143 ):;issue: 002
    contenttypeFulltext
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