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    Experimental Study of Load Variations on Pressure Fluctuations in a Prototype Reversible Pump Turbine in Generating Mode

    Source: Journal of Fluids Engineering:;2017:;volume( 139 ):;issue: 007::page 74501
    Author:
    Zhang, Yuning
    ,
    Chen, Ting
    ,
    Li, Jinwei
    ,
    Yu, Jixing
    DOI: 10.1115/1.4036161
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The characteristics of pressure fluctuations in a prototype reversible pump turbine (RPT) is investigated within a wide range of load conditions with a focus on the low-load condition (e.g., 25% of rated power) with the aid of pressure signals obtained at several typical recording points (i.e., spiral casing, vaneless space, draft tube cone, and draft tube elbow). Our findings reveal that at the low-load condition, the pressure fluctuation is quite significant (e.g., above 12% in terms of nondimensional values), especially in the vaneless space and spiral casing with the dominant frequency being the blade passing frequency. Furthermore, based on the characteristics of pressure fluctuation, the investigated load range is divided into three zones. For zone I (with low load), the amplitude of pressure fluctuation is highest and the dominant mechanism is the rotor–stator interaction in the vaneless space with the blade passing frequency. For zone II (with medium load), the amplitude of pressure fluctuation is less prominent (below 5%) and the dominant mechanism is the low-frequency fluctuations induced by the swirling vortex rope. For zone III (with high load), the amplitude of pressure fluctuation is quite limited (less than 3%) and the dominant mechanism is still the rotor–stator interaction but with the dominant frequency being the harmonics of blade passing frequency. Detailed examples for all three zones are given and discussed with quantitative descriptions of propagation mechanism of fluctuation.
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      Experimental Study of Load Variations on Pressure Fluctuations in a Prototype Reversible Pump Turbine in Generating Mode

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4234043
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    contributor authorZhang, Yuning
    contributor authorChen, Ting
    contributor authorLi, Jinwei
    contributor authorYu, Jixing
    date accessioned2017-11-25T07:16:29Z
    date available2017-11-25T07:16:29Z
    date copyright2017/27/4
    date issued2017
    identifier issn0098-2202
    identifier otherfe_139_07_074501.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4234043
    description abstractThe characteristics of pressure fluctuations in a prototype reversible pump turbine (RPT) is investigated within a wide range of load conditions with a focus on the low-load condition (e.g., 25% of rated power) with the aid of pressure signals obtained at several typical recording points (i.e., spiral casing, vaneless space, draft tube cone, and draft tube elbow). Our findings reveal that at the low-load condition, the pressure fluctuation is quite significant (e.g., above 12% in terms of nondimensional values), especially in the vaneless space and spiral casing with the dominant frequency being the blade passing frequency. Furthermore, based on the characteristics of pressure fluctuation, the investigated load range is divided into three zones. For zone I (with low load), the amplitude of pressure fluctuation is highest and the dominant mechanism is the rotor–stator interaction in the vaneless space with the blade passing frequency. For zone II (with medium load), the amplitude of pressure fluctuation is less prominent (below 5%) and the dominant mechanism is the low-frequency fluctuations induced by the swirling vortex rope. For zone III (with high load), the amplitude of pressure fluctuation is quite limited (less than 3%) and the dominant mechanism is still the rotor–stator interaction but with the dominant frequency being the harmonics of blade passing frequency. Detailed examples for all three zones are given and discussed with quantitative descriptions of propagation mechanism of fluctuation.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Study of Load Variations on Pressure Fluctuations in a Prototype Reversible Pump Turbine in Generating Mode
    typeJournal Paper
    journal volume139
    journal issue7
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4036161
    journal fristpage74501
    journal lastpage074501-4
    treeJournal of Fluids Engineering:;2017:;volume( 139 ):;issue: 007
    contenttypeFulltext
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