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    On the Prediction and Theory of the Temperature Increase of Low Pressure Last Stage Moving Blades During Low Volume Flow Conditions, and Limiting it Through Steam Extraction Methods

    Source: Journal of Turbomachinery:;2015:;volume( 137 ):;issue: 010::page 101002
    Author:
    Beevers, Adam
    ,
    Havakechian, Said
    ,
    Megerle, Benjamin
    DOI: 10.1115/1.4030258
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: During extreme low volume flow conditions, the last stages of a low pressure steam turbine operate in ventilation conditions that can cause a significant temperature increase of critical regions of the last stage moving blade (LSB). Under some conditions, the blade temperature may rise above a safe operating temperature, requiring the machine to be shut down. Limiting the heating effect on the LSB increases the allowable operating range of the low pressure turbine. One common method is to spray water droplets into the low pressure exhaust. As the length of LSBs continues to increase, this method reaches its limit of practical operating effectiveness due to the amount of water required and its impact on the erosion of the LSB. An investigation into complimentary solutions to limit the temperature increase was conducted using CFD. An appropriate CFD setup was chosen from a sensitivity study on the effects from geometry, mesh density, turbulence model, and time dependency. The CFD results were verified against steam turbine data from a scaled test facility. The proposed solutions include low temperature steam extraction, targeted for critical regions of the moving blade. From the test turbine and CFD results, the drivers of the temperature increase during ventilation conditions are identified and described.
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      On the Prediction and Theory of the Temperature Increase of Low Pressure Last Stage Moving Blades During Low Volume Flow Conditions, and Limiting it Through Steam Extraction Methods

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    http://yetl.yabesh.ir/yetl1/handle/yetl/159974
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    contributor authorBeevers, Adam
    contributor authorHavakechian, Said
    contributor authorMegerle, Benjamin
    date accessioned2017-05-09T01:24:45Z
    date available2017-05-09T01:24:45Z
    date issued2015
    identifier issn0889-504X
    identifier otherturbo_137_10_101002.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/159974
    description abstractDuring extreme low volume flow conditions, the last stages of a low pressure steam turbine operate in ventilation conditions that can cause a significant temperature increase of critical regions of the last stage moving blade (LSB). Under some conditions, the blade temperature may rise above a safe operating temperature, requiring the machine to be shut down. Limiting the heating effect on the LSB increases the allowable operating range of the low pressure turbine. One common method is to spray water droplets into the low pressure exhaust. As the length of LSBs continues to increase, this method reaches its limit of practical operating effectiveness due to the amount of water required and its impact on the erosion of the LSB. An investigation into complimentary solutions to limit the temperature increase was conducted using CFD. An appropriate CFD setup was chosen from a sensitivity study on the effects from geometry, mesh density, turbulence model, and time dependency. The CFD results were verified against steam turbine data from a scaled test facility. The proposed solutions include low temperature steam extraction, targeted for critical regions of the moving blade. From the test turbine and CFD results, the drivers of the temperature increase during ventilation conditions are identified and described.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOn the Prediction and Theory of the Temperature Increase of Low Pressure Last Stage Moving Blades During Low Volume Flow Conditions, and Limiting it Through Steam Extraction Methods
    typeJournal Paper
    journal volume137
    journal issue10
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4030258
    journal fristpage101002
    journal lastpage101002
    identifier eissn1528-8900
    treeJournal of Turbomachinery:;2015:;volume( 137 ):;issue: 010
    contenttypeFulltext
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