A comparison of oscillating sweeping jet and steady normal jet in cooling gas turbine leading edge: Numerical analysis

Mohammed S. Khan, Mohammad O. Hamdan, Salah A.B. Al-Omari, Emad Elnajjar

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Impinging jets have emerged as a prominent cooling technology in the gas turbine industry. With the addition of fluidic oscillators as heat removal devices, steady-state impinging jets can be converted to sweeping impinging jets, presenting an opportunity to improve the heat transfer performance of current impinging jets by covering a larger cooling surface area on the leading edge of a gas turbine blade. Sweeping jets are self-oscillating devices that operate based on the Coanda effect, making them self-sustaining. In this study, the flow and heat transfer performance of an array of seven steady and sweeping impinging jets were investigated using the unsteady Reynolds-averaged Navier-Stokes turbulent SST k-ω model. The sweeping jet impingement improved the heat removal performance by cooling a larger surface area of the leading edge with a constant heat flux and by improving the overall time-averaged cooling effectiveness. Compared with the steady jet case, the sweeping jet case shows an improvement in heat transfer of 12.2%. Further, the use of fluidic oscillators (sweeping jets) produced a more uniform mass flow rate distribution from all jets compared with a simple jet.

Original languageEnglish
Article number124041
JournalInternational Journal of Heat and Mass Transfer
Volume208
DOIs
Publication statusPublished - Jul 2023

Keywords

  • Fluidic oscillator
  • Gas Turbine blade leading edge
  • Impingement cooling
  • SST k-ω model
  • Steady jet
  • Sweeping jet

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Fingerprint

Dive into the research topics of 'A comparison of oscillating sweeping jet and steady normal jet in cooling gas turbine leading edge: Numerical analysis'. Together they form a unique fingerprint.

Cite this