Cooling effectiveness and aerodynamic performance in a 2D-Contoured endwall passage with different mass flow ratios

Pingting Chen, Mahmood Alqefl, Xueying Li, Jing Ren, Hongde Jiang, Terrence W Simon

Research output: Contribution to journalArticle

Abstract

Endwall 2D-contouring is a presently-employed design feature for reducing the strength of secondary flows within gas turbine passages. Such contouring can lead to significant changes of passage flow, making the flow field different from that of the widely-studied flat-endwall passage. Also, there is an interface, or leakage slot, on the endwall between the combustor and the turbine affecting the passage flow. Though introduced for eliminating ingression of passage gas into the cavity, leakage flow through it, which has bypassed the combustor, can be used to cool the endwall and vane surfaces. Moreover, this leakage flow interacts with the main flow resulting in a change of aerodynamic losses. In this study, a 3D RANS method using an SST γ-θ transition model was employed to investigate endwall adiabatic cooling effectiveness values, η, and passage total pressure loss coefficients, TPLC, in a nozzle guide vane passage with a 2D-contoured endwall. Cases of differing mass flow ratios, MFRs, for flow through the slot were evaluated and compared. The numerical method employed was validated by comparing its computed results with experimental data. The results show how cooling effectiveness, aerodynamic performance and vortex structures near the endwall are significantly affected by passage flows of various MFR values. An appropriate range of MFR was found for gaining high adiabatic cooling effectiveness values and low aerodynamic losses while avoiding hot gas ingression into the slot.

Original languageEnglish (US)
Pages (from-to)233-246
Number of pages14
JournalInternational Journal of Thermal Sciences
Volume142
DOIs
StatePublished - Aug 1 2019

Fingerprint

mass flow
aerodynamics
Aerodynamics
Cooling
Combustors
cooling
slots
Secondary flow
Leakage (fluid)
leakage
Gases
combustion chambers
Gas turbines
Nozzles
Numerical methods
Flow fields
Vortex flow
Turbines
guide vanes
vanes

Keywords

  • Aerodynamic loss
  • Contoured endwall
  • Film cooling
  • MFR

Cite this

Cooling effectiveness and aerodynamic performance in a 2D-Contoured endwall passage with different mass flow ratios. / Chen, Pingting; Alqefl, Mahmood; Li, Xueying; Ren, Jing; Jiang, Hongde; Simon, Terrence W.

In: International Journal of Thermal Sciences, Vol. 142, 01.08.2019, p. 233-246.

Research output: Contribution to journalArticle

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