Conjugate heat transfer measurements and predictions for the vane endwall of a high-pressure turbine with upstream purge flow

Xing Yang, Zhansheng Liu, Qiang Zhao, Zhao Liu, Zhenping Feng, Fushui Guo, Liang Ding, Terrence W Simon

Research output: Contribution to journalArticle

Abstract

In this study, overall cooling effectiveness of a vane endwall for a high-pressure turbine of an aero-engine is investigated using combined experimental and numerical methods. In particular, the influence of purge flow upstream of the endwall is examined on the conjugate endwall for various coolant mass flow rates and mainstream flow Reynolds numbers of 1.4 × 105–4.2 × 105. The cooling configuration investigated incorporates internal jet impingement cooling and external purge flow and film cooling. Purge flow is injected at an inclination angle of 20 deg from a slot at 12% axial chord length upstream of the vane leading edge and film coolant is injection from three rows of discrete holes within the vane passage on the endwall. Geometric and flow parameters of the engine turbine vane are matched to engine conditions to obtain engine-relevant non-dimensional temperatures. Computational results with and without purge flow are compared to the experimental data, showing good agreement with one another, with an overall averaged error of less than 5.0%. Both measurements and predictions indicate that purge flow has profound enhancement effects on endwall overall cooling effectiveness, particularly improving cooling uniformity. Improvement due to purge flow increases with increases of purge flow rate. Since Reynolds number impacts the external and internal heat transfer simultaneously, the Reynolds number effects depend on which one dominates, but passage inlet Reynolds number globally has little effects on endwall overall cooling performance compared to the effects of coolant mass flow rates. In addition, the numerical results are analyzed to better describe thermal fields in the solid and fluid and, mixing between coolant injection and mainstream flows.

Original languageEnglish (US)
Pages (from-to)634-647
Number of pages14
JournalInternational Journal of Heat and Mass Transfer
Volume140
DOIs
StatePublished - Sep 1 2019

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vanes
turbines
upstream
Turbines
heat transfer
Heat transfer
Cooling
coolants
Coolants
predictions
cooling
Reynolds number
engines
Flow rate
Engines
mass flow rate
turbine engines
injection
jet impingement
film cooling

Keywords

  • Conjugate heat transfer
  • High-pressure turbine endwall
  • Measurements
  • Numerical simulations
  • Purge flow

Cite this

Conjugate heat transfer measurements and predictions for the vane endwall of a high-pressure turbine with upstream purge flow. / Yang, Xing; Liu, Zhansheng; Zhao, Qiang; Liu, Zhao; Feng, Zhenping; Guo, Fushui; Ding, Liang; Simon, Terrence W.

In: International Journal of Heat and Mass Transfer, Vol. 140, 01.09.2019, p. 634-647.

Research output: Contribution to journalArticle

Yang, Xing ; Liu, Zhansheng ; Zhao, Qiang ; Liu, Zhao ; Feng, Zhenping ; Guo, Fushui ; Ding, Liang ; Simon, Terrence W. / Conjugate heat transfer measurements and predictions for the vane endwall of a high-pressure turbine with upstream purge flow. In: International Journal of Heat and Mass Transfer. 2019 ; Vol. 140. pp. 634-647.
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AB - In this study, overall cooling effectiveness of a vane endwall for a high-pressure turbine of an aero-engine is investigated using combined experimental and numerical methods. In particular, the influence of purge flow upstream of the endwall is examined on the conjugate endwall for various coolant mass flow rates and mainstream flow Reynolds numbers of 1.4 × 105–4.2 × 105. The cooling configuration investigated incorporates internal jet impingement cooling and external purge flow and film cooling. Purge flow is injected at an inclination angle of 20 deg from a slot at 12% axial chord length upstream of the vane leading edge and film coolant is injection from three rows of discrete holes within the vane passage on the endwall. Geometric and flow parameters of the engine turbine vane are matched to engine conditions to obtain engine-relevant non-dimensional temperatures. Computational results with and without purge flow are compared to the experimental data, showing good agreement with one another, with an overall averaged error of less than 5.0%. Both measurements and predictions indicate that purge flow has profound enhancement effects on endwall overall cooling effectiveness, particularly improving cooling uniformity. Improvement due to purge flow increases with increases of purge flow rate. Since Reynolds number impacts the external and internal heat transfer simultaneously, the Reynolds number effects depend on which one dominates, but passage inlet Reynolds number globally has little effects on endwall overall cooling performance compared to the effects of coolant mass flow rates. In addition, the numerical results are analyzed to better describe thermal fields in the solid and fluid and, mixing between coolant injection and mainstream flows.

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