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    Optimization of the Efficiency of Stall Control Using Air Injection for Centrifugal Compressors

    Source: Journal of Engineering for Gas Turbines and Power:;2015:;volume( 137 ):;issue: 007::page 72604
    Author:
    Halawa, Taher
    ,
    Gadala, Mohamed S.
    ,
    Alqaradawi, Mohamed
    ,
    Badr, Osama
    DOI: 10.1115/1.4029169
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Numerical investigation of the optimization of the stall control efficiency for a high speed centrifugal compressor using air injection is presented. External air was injected close to the diffuser entrance at the shroud surface of the vaneless region. Injection was applied with mass flow rates of 0.7%, 1%, and 1.5% of the design inlet mass flow rate with six different angles of 0 deg, 10 deg, 20 deg, 30 deg, 40 deg, and 180 deg measured from the positive tangential direction at the vaneless region. Detailed comparisons were made between the case without using air injection and the different air injection cases by comparing velocity, pressure, and force fluctuations with time. Results showed that as the injection mass flow rate increases, the number of diffuser passages with reversed flow decreases for all cases of injection except for the case of reverse tangent injection. Results indicated that using angle of injection of 30 deg minimized the stall area and provided the least force fluctuations with no reversed flow compared to other injection angles. Finally, it was found that injecting air with mass flow rate of 1.5% of the inlet mass flow rate at an angle of 30 deg resulted in shifting of stall onset to a mass flow rate corresponding to 3.8 kg/s instead of 4 kg/s for a compressor without using air injection control.
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      Optimization of the Efficiency of Stall Control Using Air Injection for Centrifugal Compressors

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    http://yetl.yabesh.ir/yetl1/handle/yetl/157997
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    contributor authorHalawa, Taher
    contributor authorGadala, Mohamed S.
    contributor authorAlqaradawi, Mohamed
    contributor authorBadr, Osama
    date accessioned2017-05-09T01:18:02Z
    date available2017-05-09T01:18:02Z
    date issued2015
    identifier issn1528-8919
    identifier othergtp_137_07_072604.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/157997
    description abstractNumerical investigation of the optimization of the stall control efficiency for a high speed centrifugal compressor using air injection is presented. External air was injected close to the diffuser entrance at the shroud surface of the vaneless region. Injection was applied with mass flow rates of 0.7%, 1%, and 1.5% of the design inlet mass flow rate with six different angles of 0 deg, 10 deg, 20 deg, 30 deg, 40 deg, and 180 deg measured from the positive tangential direction at the vaneless region. Detailed comparisons were made between the case without using air injection and the different air injection cases by comparing velocity, pressure, and force fluctuations with time. Results showed that as the injection mass flow rate increases, the number of diffuser passages with reversed flow decreases for all cases of injection except for the case of reverse tangent injection. Results indicated that using angle of injection of 30 deg minimized the stall area and provided the least force fluctuations with no reversed flow compared to other injection angles. Finally, it was found that injecting air with mass flow rate of 1.5% of the inlet mass flow rate at an angle of 30 deg resulted in shifting of stall onset to a mass flow rate corresponding to 3.8 kg/s instead of 4 kg/s for a compressor without using air injection control.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOptimization of the Efficiency of Stall Control Using Air Injection for Centrifugal Compressors
    typeJournal Paper
    journal volume137
    journal issue7
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4029169
    journal fristpage72604
    journal lastpage72604
    identifier eissn0742-4795
    treeJournal of Engineering for Gas Turbines and Power:;2015:;volume( 137 ):;issue: 007
    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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