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    Numerical and Experimental Investigation of Aerodynamic Performance for a Straight Turbine Cascade With a Novel Partial Shroud

    Source: Journal of Fluids Engineering:;2016:;volume( 138 ):;issue: 003::page 31206
    Author:
    Liu, Yan
    ,
    Zhang, Tian
    ,
    Zhang, Min
    ,
    Zhang, Meng
    DOI: 10.1115/1.4031556
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A comparative experimental and numerical analysis is carried out to assess the aerodynamic performance of a novel partial shroud in a straight turbine cascade. This partial shroud is designed as a combination of winglet and shroud. A plain tip is employed as a baseline case. A pure winglet tip is also studied for comparison. Both experiments and predictions demonstrate that this novel partial shroud configuration has aerodynamic advantages over the pure winglet arrangement. Predicted results show that, relative to the baseline blade with a plain tip, using the partial shroud can lead to a reduction of 20.89% in the massaveraged total pressure coefficient on the upper halfspan of a plane downstream of the cascade trailing edge and 16.53% in the tip leakage mass flow rate, whereas the pure winglet only decreases these two performance parameters by 11.36% and 1.32%, respectively. The flow physics is explored in detail to explain these results via topological analyses. The use of this new partial shroud significantly affects the topological structures and total pressure loss coefficients on various axial cross sections, particularly at the rear part of the blade passage. The partial shroud not only weakens the tip leakage vortex (TLV) but also reduces the strength of passage vortex near the casing (PVC) endwall. Furthermore, three partial shrouds with widthtopitch ratios of 3%, 5%, and 7% are considered. With an increase in the width of the winglet part, improvements in aerodynamics and the tip leakage mass flow rate are limited.
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      Numerical and Experimental Investigation of Aerodynamic Performance for a Straight Turbine Cascade With a Novel Partial Shroud

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    http://yetl.yabesh.ir/yetl1/handle/yetl/161328
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    contributor authorLiu, Yan
    contributor authorZhang, Tian
    contributor authorZhang, Min
    contributor authorZhang, Meng
    date accessioned2017-05-09T01:29:22Z
    date available2017-05-09T01:29:22Z
    date issued2016
    identifier issn0098-2202
    identifier otherfe_138_03_031206.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/161328
    description abstractA comparative experimental and numerical analysis is carried out to assess the aerodynamic performance of a novel partial shroud in a straight turbine cascade. This partial shroud is designed as a combination of winglet and shroud. A plain tip is employed as a baseline case. A pure winglet tip is also studied for comparison. Both experiments and predictions demonstrate that this novel partial shroud configuration has aerodynamic advantages over the pure winglet arrangement. Predicted results show that, relative to the baseline blade with a plain tip, using the partial shroud can lead to a reduction of 20.89% in the massaveraged total pressure coefficient on the upper halfspan of a plane downstream of the cascade trailing edge and 16.53% in the tip leakage mass flow rate, whereas the pure winglet only decreases these two performance parameters by 11.36% and 1.32%, respectively. The flow physics is explored in detail to explain these results via topological analyses. The use of this new partial shroud significantly affects the topological structures and total pressure loss coefficients on various axial cross sections, particularly at the rear part of the blade passage. The partial shroud not only weakens the tip leakage vortex (TLV) but also reduces the strength of passage vortex near the casing (PVC) endwall. Furthermore, three partial shrouds with widthtopitch ratios of 3%, 5%, and 7% are considered. With an increase in the width of the winglet part, improvements in aerodynamics and the tip leakage mass flow rate are limited.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNumerical and Experimental Investigation of Aerodynamic Performance for a Straight Turbine Cascade With a Novel Partial Shroud
    typeJournal Paper
    journal volume138
    journal issue3
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4031556
    journal fristpage31206
    journal lastpage31206
    identifier eissn1528-901X
    treeJournal of Fluids Engineering:;2016:;volume( 138 ):;issue: 003
    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
    yabeshDSpacePersian