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3D Measurements of coupled freestream turbulence and secondary flow effects on film cooling

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Abstract

The effect of freestream turbulence on a single round film cooling hole is examined at two turbulence levels of 5 and 8% and compared to a baseline low freestream turbulence case. The hole is inclined at 30\(^{\circ }\) and has length to diameter ratio \(L/D=4\) and unity blowing ratio. Turbulence is generated with grid upstream of the hole in the main channel. The three-dimensional, three-component mean velocity field is acquired with magnetic resonance velocimetry (MRV) and the three-dimensional temperature field is acquired with magnetic resonance thermometry (MRT). The 8% turbulence grid produces weak mean secondary flows in the mainstream (peak crossflow velocities are 7% of \(U_\mathrm{bulk}\)) which push the jet close to the wall and significantly change the adiabatic effectiveness distribution. By contrast, the 5% grid has a simpler structure and does not produce a measurable secondary flow structure. The grid turbulence causes little change to the temperature field, indicating that the turbulence generated in the shear layers around the jet dominates the freestream turbulence. The results suggest that secondary flows induced by complex turbulence generators may have caused some of the contradictory results in previous works.

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Acknowledgements

This work was made possible with support from Honeywell Aerospace. We are grateful to Jan F. Heyse for his contributions to the project

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Authors and Affiliations

  1. Flow Physics and Computational Engineering, Department of Mechanical Engineering, Stanford University, 488 Escondido Mall, Stanford, CA, 94305, USA

    David S. Ching, Haosen H. A. Xu, Christopher J. Elkins & John K. Eaton

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  1. David S. Ching
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  2. Haosen H. A. Xu
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  3. Christopher J. Elkins
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  4. John K. Eaton
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Correspondence to David S. Ching.

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Ching, D.S., Xu, H.H.A., Elkins, C.J. et al. 3D Measurements of coupled freestream turbulence and secondary flow effects on film cooling. Exp Fluids 59, 99 (2018). https://doi.org/10.1007/s00348-018-2555-7

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  • DOI: https://doi.org/10.1007/s00348-018-2555-7

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