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Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control

Hickling, Tom; Ingram, Grant

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Authors

Tom Hickling



Abstract

S-duct diffusers are used in aircraft with embedded engines to route ambient air to the fan face. Sizing and stealth considerations drive a need for high curvature ducts, but the curvature causes complex secondary flows that lead to total pressure distortion and swirl velocities at the engine face. These must be controlled for stable engine operation. In this paper, tubercles, a novel bio-inspired passive flow control method, are analysed numerically in a duct with transonic flow. The results are compared to experimental data obtained as part of a campaign at the Royal Military College, Canada to investigate the effects of S-duct geometry and novel passive flow control devices on the performance of transonic S-ducts. The performance of RANS turbulence models in the S-ducts is assessed - Menter's SST model predicts excessive losses due to the over-activity of its stress limiter. The realisable k-ε model gives a significant improvement in the prediction of static pressure distributions, but losses and distortion characteristics are predicted poorly due to the model's inability to resolve the effects of unsteadiness in separated regions. Large tubercle geometries are found to trigger earlier separation in the centre of the duct by concentrating low momentum fluid in valleys, but they also act as boundary layer fences away from the duct centre. Smaller geometries are found to generate vortices that re-energise the boundary layer, delaying flow separation. Methods are recommended for future computational analyses of S-ducts and new designs of tubercles.

Citation

Hickling, T., & Ingram, G. (2020). Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 234(1), 31-45. https://doi.org/10.1177/0957650919845765

Journal Article Type Article
Acceptance Date Mar 13, 2019
Publication Date Feb 1, 2020
Deposit Date May 13, 2019
Publicly Available Date May 14, 2019
Journal Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Print ISSN 0957-6509
Electronic ISSN 2041-2967
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 234
Issue 1
Pages 31-45
DOI https://doi.org/10.1177/0957650919845765
Public URL https://durham-repository.worktribe.com/output/1330777

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Copyright Statement
Hickling, Tom & Ingram, Grant (2020). Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234(1): 31-45. Copyright © IMechE 2019. DOI: https://doi.org/10.1177/0957650919845765





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