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    Reduction of Secondary Flow Losses in Turbine Cascades by Leading Edge Modifications at the Endwall

    Source: Journal of Turbomachinery:;2001:;volume( 123 ):;issue: 002::page 207
    Author:
    H. Sauer
    ,
    R. Müller
    ,
    K. Vogeler
    DOI: 10.1115/1.1354142
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Experimental results are presented which show the influence on the secondary flow and its losses by a profile modification of the leading edge very close to the endwall. The investigation was carried out with a well-known turbine profile that originally was developed for highly loaded low pressure turbines. The tests were done in a low speed cascade wind tunnel. The geometrical modification was achieved by a local thickness increase; a leading edge endwall bulb. It was expected that this would intensify the suction side branch of the horse-shoe (hs-) vortex with a desirable weakening effect on the passage vortex. The investigated configuration shows a reduction of secondary losses by 2.1 percent points that represents approximately 50 percent of these losses compared to the reference profile. Detailed measurements of the total pressure field behind the cascade are presented for both the reference and the modified profile. The influence of the modified hs-vortex on the overall passage vortex can be clearly seen. The results of a numerical analysis are compared with the experimental findings. A numerical analysis shows that the important details of the experimental findings can be reproduced. Quantitative values are locally different. The theoretical approach taken cannot yet be used for an exact prediction of the loss reduction. However, the analysis of the interaction and the resulting tendencies are considered to be valid. Hence, theoretical investigations as a guideline for the design of a leading edge bulb at the endwall are a valuable tool.
    keyword(s): Pressure , Flow (Dynamics) , Cascades (Fluid dynamics) , Turbines , Vortices , Boundary layers , Suction , Numerical analysis AND Design ,
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      Reduction of Secondary Flow Losses in Turbine Cascades by Leading Edge Modifications at the Endwall

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    http://yetl.yabesh.ir/yetl1/handle/yetl/126042
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    contributor authorH. Sauer
    contributor authorR. Müller
    contributor authorK. Vogeler
    date accessioned2017-05-09T00:06:16Z
    date available2017-05-09T00:06:16Z
    date copyrightApril, 2001
    date issued2001
    identifier issn0889-504X
    identifier otherJOTUEI-28687#207_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/126042
    description abstractExperimental results are presented which show the influence on the secondary flow and its losses by a profile modification of the leading edge very close to the endwall. The investigation was carried out with a well-known turbine profile that originally was developed for highly loaded low pressure turbines. The tests were done in a low speed cascade wind tunnel. The geometrical modification was achieved by a local thickness increase; a leading edge endwall bulb. It was expected that this would intensify the suction side branch of the horse-shoe (hs-) vortex with a desirable weakening effect on the passage vortex. The investigated configuration shows a reduction of secondary losses by 2.1 percent points that represents approximately 50 percent of these losses compared to the reference profile. Detailed measurements of the total pressure field behind the cascade are presented for both the reference and the modified profile. The influence of the modified hs-vortex on the overall passage vortex can be clearly seen. The results of a numerical analysis are compared with the experimental findings. A numerical analysis shows that the important details of the experimental findings can be reproduced. Quantitative values are locally different. The theoretical approach taken cannot yet be used for an exact prediction of the loss reduction. However, the analysis of the interaction and the resulting tendencies are considered to be valid. Hence, theoretical investigations as a guideline for the design of a leading edge bulb at the endwall are a valuable tool.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleReduction of Secondary Flow Losses in Turbine Cascades by Leading Edge Modifications at the Endwall
    typeJournal Paper
    journal volume123
    journal issue2
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.1354142
    journal fristpage207
    journal lastpage213
    identifier eissn1528-8900
    keywordsPressure
    keywordsFlow (Dynamics)
    keywordsCascades (Fluid dynamics)
    keywordsTurbines
    keywordsVortices
    keywordsBoundary layers
    keywordsSuction
    keywordsNumerical analysis AND Design
    treeJournal of Turbomachinery:;2001:;volume( 123 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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