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NUMERICAL INVESTIGATION OF FILM-COOLING EFFECTIVENESS DOWNSTREAM OF A MICRO RAMP

Volume 10, Issue 2, 2018, pp. 151-165
DOI: 10.1615/ComputThermalScien.2017020468
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ABSTRACT

Gas turbine blades operate under high temperatures and thermal stresses caused by hot combustion gases issuing from the combustion chamber. A film-cooling technique is usually used to protect the surfaces of the blades and to avoid turbine damage. This paper investigates numerically the effect of a micro ramp (MR) on film-cooling performance in a jet-crossflow configuration. The configuration comprises an inclined coolant jet at 35° interacting with a hot crossflow. The micro ramp is placed downstream of the jet, where different heights of MR are investigated. The numerical simulations are carried out using Reynolds-averaged Navier-Stokes (RANS) technique with realizable k-ε as a turbulence closure model. Validations of the computational model with the experimental data are performed, and good agreement is found. The flow field and vortices downstream of the jet are analyzed for baseline and MR configurations. Results reported that the counter-rotating vortex pair (CRVP) is present for the baseline configuration and is not found inMR configurations. In addition, the flow field shows significant changes at each height of MR. Furthermore, the film-cooling effectiveness is analyzed and discussed according to the thickness, width, and inclination angle of the thermal layer (coolant jet) on the flat plate. It is found that the highest MR used is the most reliable and it enhances significantly the film-cooling effectiveness compared with the other MR configurations. Finally, the effect of two blowing ratios (M = 1 and M = 1.5) on film-cooling effectiveness is investigated. Results indicated that the maximum effectiveness is found at M = 1.5 with the highest MR (Ramp C).

CITED BY
  1. Settar Abdelhakim, Mansouri Zakaria, Nebbali Rachid, Madani Brahim, Abboudi Said, Impact of Ni-based catalyst patterning on hydrogen production from MSR: External steam reformer modelling, International Journal of Hydrogen Energy, 44, 22, 2019. Crossref

  2. Zhang C., Bai L. C., Zhang P. F., Sensitivity Analysis of the Film-Cooling Effectiveness of an Upstream Crescent-Shaped Vortex Generator to Geometric Parameters, Journal of Engineering Physics and Thermophysics, 94, 5, 2021. Crossref

  3. Mansouri Zakaria, Aerodynamic and heat transfer performances of a highly loaded transonic turbine rotor with upstream generic rim seal cavity, Propulsion and Power Research, 10, 4, 2021. Crossref

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