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Open AccessArticle

On the Influence of High Turbulence on the Convective Heat Flux on the High-Pressure Turbine Vane LS89

1
Von Karman Institute for Fluid Dynamics, 1640 Sint-Genesius-Rode, Belgium
2
Safran Tech, Modelling & Simulation, 78114 Magny-Les-Hameaux, France
*
Author to whom correspondence should be addressed.
Int. J. Turbomach. Propuls. Power 2019, 4(4), 37; https://doi.org/10.3390/ijtpp4040037
Received: 12 August 2019 / Revised: 13 October 2019 / Accepted: 4 November 2019 / Published: 8 November 2019
High-pressure turbine vanes and blades are subjected to a turbulent combustor flow affecting the heat transfer and boundary layer transition, hence, the temperature distribution. The accurate prediction of the temperature distribution is crucial for a reliable design and cooling implementation. Engine-representative measurements are hence mandatory for improving design tools. Recently, convective heat transfer measurements were conducted on a high-pressure turbine inlet guide vane (VKI LS89 airfoil) in the Isentropic Compression Tube (CT-2) facility at the von Karman Institute. This contribution focuses on the effect of high freestream turbulence generated by a new turbulence grid allowing a range of turbulence intensities in excess of 10% with representative length scales of the order of 1–2 cm. Three cases with varying turbulence levels are discussed in this paper. The different flow conditions are exit isentropic Mach numbers of 0.70–0.97, Reynolds numbers of 0.53 × 106 and 1.15 × 106 and a constant temperature ratio equal to 1.36. The heat transfer distributions along the vane suction side indicate a clear link between boundary layer transition and the stream-wise pressure gradients even at high levels of freestream turbulence intensity. Differences are put in evidence in the dynamics of the transition development. Future developments will focus also on the contribution of the other flow parameters under high turbulence. Heat transfer predictions from the boundary layer code TEXSTAN and Reynolds-Averaged Navier–Stokes code elsA (ensemble logiciel pour la simulation en Aérodynamique) are additionally compared to the experiments. Inherent difficulties associated with high turbulence modelling are clear from this early numerical work. View Full-Text
Keywords: elevated turbulence intensity; convective heat transfer measurements; boundary layer transition; high-pressure turbines; linear cascade; boundary layer code; Reynolds-Averaged Navier Stokes (RANS) elevated turbulence intensity; convective heat transfer measurements; boundary layer transition; high-pressure turbines; linear cascade; boundary layer code; Reynolds-Averaged Navier Stokes (RANS)
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MDPI and ACS Style

Cação Ferreira, T.S.; Arts, T.; Croner, E. On the Influence of High Turbulence on the Convective Heat Flux on the High-Pressure Turbine Vane LS89. Int. J. Turbomach. Propuls. Power 2019, 4, 37.

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