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    Supercritical Carbon Dioxide Mixing Loss Characteristics Near the Critical Point

    Source: Journal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 005::page 51020-1
    Author:
    Wang, Jinhong
    ,
    Cao, Teng
    ,
    Martinez-Botas, Ricardo
    DOI: 10.1115/1.4066603
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper aims to study the mixing loss characteristic of supercritical carbon dioxide (sCO2) near the critical point and shed light on the nonideal fluid effect on the mixing losses. As a simplified model of the mixing process in the trailing edge or tip leakage flow in turbomachines, a case of mixing in a constant area adiabatic duct involving two streams of parallel flows is studied by control volume analysis. Both perfect gas and nonideal fluid calculations are carried out for comparisons. The isolated and coupled effects of the two mixing streams' temperature, velocity, and pressure differences on the loss are investigated. The study shows that nonideal fluid mixing produces significantly higher losses when compared to the equivalent perfect gas estimation. It also reveals that the nonideal fluid mixing loss is sensitive to the average thermodynamic states of the mixing streams. A general trend is that the closer the temperature is to the critical point, the higher the loss is observed. This is particularly apparent for the temperature and pressure mixings, while the mixing loss due to the velocity difference is less affected. A significant variation of the mixing loss coefficient is reported if the static state of any of the two streams is near the critical point, which is mainly caused by the significant variation of the temperature gradient regarding the entropy along the isobar. In addition, a positive combined effect of the temperature, velocity, and pressure differences was found for mixing loss. The results also show that the change in the mixing loss due to the variation of one property difference between mixing streams is almost independent of the other property difference. This behavior matches the conclusion drawn in literature for perfect gases (Denton, J. D., 1993, “The 1993 IGTI Scholar Lecture: Loss Mechanisms in Turbomachines,” ASME J. Turbomach., 115(4), pp. 621–656). The results from this simple case contribute to understanding the mixing loss behavior differences between perfect gas and nonideal fluids in sCO2 turbomachinery and hold significance for the development of mean-line models.
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      Supercritical Carbon Dioxide Mixing Loss Characteristics Near the Critical Point

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4306555
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorWang, Jinhong
    contributor authorCao, Teng
    contributor authorMartinez-Botas, Ricardo
    date accessioned2025-04-21T10:36:56Z
    date available2025-04-21T10:36:56Z
    date copyright11/22/2024 12:00:00 AM
    date issued2024
    identifier issn0742-4795
    identifier othergtp_147_05_051020.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306555
    description abstractThis paper aims to study the mixing loss characteristic of supercritical carbon dioxide (sCO2) near the critical point and shed light on the nonideal fluid effect on the mixing losses. As a simplified model of the mixing process in the trailing edge or tip leakage flow in turbomachines, a case of mixing in a constant area adiabatic duct involving two streams of parallel flows is studied by control volume analysis. Both perfect gas and nonideal fluid calculations are carried out for comparisons. The isolated and coupled effects of the two mixing streams' temperature, velocity, and pressure differences on the loss are investigated. The study shows that nonideal fluid mixing produces significantly higher losses when compared to the equivalent perfect gas estimation. It also reveals that the nonideal fluid mixing loss is sensitive to the average thermodynamic states of the mixing streams. A general trend is that the closer the temperature is to the critical point, the higher the loss is observed. This is particularly apparent for the temperature and pressure mixings, while the mixing loss due to the velocity difference is less affected. A significant variation of the mixing loss coefficient is reported if the static state of any of the two streams is near the critical point, which is mainly caused by the significant variation of the temperature gradient regarding the entropy along the isobar. In addition, a positive combined effect of the temperature, velocity, and pressure differences was found for mixing loss. The results also show that the change in the mixing loss due to the variation of one property difference between mixing streams is almost independent of the other property difference. This behavior matches the conclusion drawn in literature for perfect gases (Denton, J. D., 1993, “The 1993 IGTI Scholar Lecture: Loss Mechanisms in Turbomachines,” ASME J. Turbomach., 115(4), pp. 621–656). The results from this simple case contribute to understanding the mixing loss behavior differences between perfect gas and nonideal fluids in sCO2 turbomachinery and hold significance for the development of mean-line models.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSupercritical Carbon Dioxide Mixing Loss Characteristics Near the Critical Point
    typeJournal Paper
    journal volume147
    journal issue5
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4066603
    journal fristpage51020-1
    journal lastpage51020-12
    page12
    treeJournal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 005
    contenttypeFulltext
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