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Investigation of the flowfield on a vaneless counter-rotating turbine with seal cavity flow ejection.

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Title: Investigation of the flowfield on a vaneless counter-rotating turbine with seal cavity flow ejection.
Authors: Sui, Xiuming1,2 (AUTHOR), Zhao, Wei1,2,3 (AUTHOR) zhaowei@iet.cn, Xiang, Xiaorong1,2 (AUTHOR), Pi, Te1,2 (AUTHOR), Zhao, Qingjun1,2,3 (AUTHOR)
Source: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power & Energy (Sage Publications, Ltd.). Dec2021, Vol. 235 Issue 8, p1864-1876. 13p.
Subject Terms: *Coolants, Turbine efficiency, Turbines, Shock waves, Unsteady flow, Aerodynamic load
Abstract: The sealing of the rotor-rotor gap and rotor disk cooling are vital to the safe operation of the vaneless counter-rotating turbine(VCRT). In order to quantifies the influence of the wheel-space cavity flow on the VCRT aerodynamic performance, and to improve turbine efficiency of the VCRT at certain rim seal ejection rates, numerical studies which considered the effects of rotor-rotor rim seal flow ejection are carried out in this paper. The three dimensional unsteady computational fluid dynamic analysis of a VCRT at the engine conditions are performed, and the seal flow ejected downstream of the high pressure rotor row at six sealing flow rate are modeled. The interaction among the high pressure rotor trailing shock wave, the downstream secondary flow and the seal flow has been studied and quantitatively characterized as a function of the purge ejection rate. Numerical results show that seal flow- mainstream flow interaction is entirely dominated by the high pressure rotor trailing edge shock at the hub, low pressure hub passage vortex and the mixing of the sealing flow from wheelspace and mainstream. When the mass flow rate of the coolant is smaller than some threshold value, the shock loss of the high pressure rotor and hub secondary flow loss of the low pressure rotor are decreased with the increasing of the coolant mass flow rate. It causes that the VCRT efficiency is gradually increased. On condition that the amount of the seal flows is beyond the threshold value, the key roles in modification of the VCRT performance are changed. The increment of the hub secondary flow loss and the mixing loss are gradually larger than the decrement of the shock loss. As a result, the turbine efficiency gradually decreases. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power & Energy (Sage Publications, Ltd.) is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Investigation of the flowfield on a vaneless counter-rotating turbine with seal cavity flow ejection.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Sui%2C+Xiuming%22">Sui, Xiuming</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Wei%22">Zhao, Wei</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> zhaowei@iet.cn</i><br /><searchLink fieldCode="AR" term="%22Xiang%2C+Xiaorong%22">Xiang, Xiaorong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pi%2C+Te%22">Pi, Te</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Qingjun%22">Zhao, Qingjun</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Proceedings+of+the+Institution+of+Mechanical+Engineers%2C+Part+A%3A+Journal+of+Power+%26+Energy+%28Sage+Publications%2C+Ltd%2E%29%22">Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power & Energy (Sage Publications, Ltd.)</searchLink>. Dec2021, Vol. 235 Issue 8, p1864-1876. 13p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Coolants%22">Coolants</searchLink><br /><searchLink fieldCode="DE" term="%22Turbine+efficiency%22">Turbine efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Turbines%22">Turbines</searchLink><br /><searchLink fieldCode="DE" term="%22Shock+waves%22">Shock waves</searchLink><br /><searchLink fieldCode="DE" term="%22Unsteady+flow%22">Unsteady flow</searchLink><br /><searchLink fieldCode="DE" term="%22Aerodynamic+load%22">Aerodynamic load</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The sealing of the rotor-rotor gap and rotor disk cooling are vital to the safe operation of the vaneless counter-rotating turbine(VCRT). In order to quantifies the influence of the wheel-space cavity flow on the VCRT aerodynamic performance, and to improve turbine efficiency of the VCRT at certain rim seal ejection rates, numerical studies which considered the effects of rotor-rotor rim seal flow ejection are carried out in this paper. The three dimensional unsteady computational fluid dynamic analysis of a VCRT at the engine conditions are performed, and the seal flow ejected downstream of the high pressure rotor row at six sealing flow rate are modeled. The interaction among the high pressure rotor trailing shock wave, the downstream secondary flow and the seal flow has been studied and quantitatively characterized as a function of the purge ejection rate. Numerical results show that seal flow- mainstream flow interaction is entirely dominated by the high pressure rotor trailing edge shock at the hub, low pressure hub passage vortex and the mixing of the sealing flow from wheelspace and mainstream. When the mass flow rate of the coolant is smaller than some threshold value, the shock loss of the high pressure rotor and hub secondary flow loss of the low pressure rotor are decreased with the increasing of the coolant mass flow rate. It causes that the VCRT efficiency is gradually increased. On condition that the amount of the seal flows is beyond the threshold value, the key roles in modification of the VCRT performance are changed. The increment of the hub secondary flow loss and the mixing loss are gradually larger than the decrement of the shock loss. As a result, the turbine efficiency gradually decreases. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power & Energy (Sage Publications, Ltd.) is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1177/09576509211018307
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1864
    Subjects:
      – SubjectFull: Coolants
        Type: general
      – SubjectFull: Turbine efficiency
        Type: general
      – SubjectFull: Turbines
        Type: general
      – SubjectFull: Shock waves
        Type: general
      – SubjectFull: Unsteady flow
        Type: general
      – SubjectFull: Aerodynamic load
        Type: general
    Titles:
      – TitleFull: Investigation of the flowfield on a vaneless counter-rotating turbine with seal cavity flow ejection.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Sui, Xiuming
      – PersonEntity:
          Name:
            NameFull: Zhao, Wei
      – PersonEntity:
          Name:
            NameFull: Xiang, Xiaorong
      – PersonEntity:
          Name:
            NameFull: Pi, Te
      – PersonEntity:
          Name:
            NameFull: Zhao, Qingjun
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 12
              Text: Dec2021
              Type: published
              Y: 2021
          Identifiers:
            – Type: issn-print
              Value: 09576509
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            – Type: volume
              Value: 235
            – Type: issue
              Value: 8
          Titles:
            – TitleFull: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power & Energy (Sage Publications, Ltd.)
              Type: main
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