TY - JOUR
T1 - A comparison of oscillating sweeping jet and steady normal jet in cooling gas turbine leading edge
T2 - Numerical analysis
AU - Khan, Mohammed S.
AU - Hamdan, Mohammad Omar
AU - Al-Omari, Salah A.B.
AU - Elnajjar, Emad
N1 - Funding Information:
FUNDING: This work was supported by the United Arab Emirates University (UPAR No. G00003683 [Grant Number: 2N088 ].
Publisher Copyright:
© 2023
PY - 2023/7
Y1 - 2023/7
N2 - 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.
AB - 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.
KW - Fluidic oscillator
KW - Gas Turbine blade leading edge
KW - Impingement cooling
KW - SST k-ω model
KW - Steady jet
KW - Sweeping jet
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U2 - 10.1016/j.ijheatmasstransfer.2023.124041
DO - 10.1016/j.ijheatmasstransfer.2023.124041
M3 - Article
AN - SCOPUS:85149827813
SN - 0017-9310
VL - 208
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
M1 - 124041
ER -