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Open AccessArticle

Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges

Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
Department of Aerospace Engineering, IIT Madras, Chennai 600036, Tamil Nadu, India
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Proceedings of the 13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, Lausanne, Switzerland, 8–12 April 2019; Paper No. 265.
Int. J. Turbomach. Propuls. Power 2019, 4(3), 25;
Received: 4 June 2019 / Revised: 24 July 2019 / Accepted: 6 August 2019 / Published: 13 August 2019
This paper studies the computational modelling of the flow separation over the engine nacelle lips under the off-design condition of significant crosswind. A numerical framework is set up to reproduce the general flow characteristics under crosswinds with increasing engine mass flow rate, which include: low-speed separation, attached flow and high speed shock-induced separation. A quasi-3D (Q3D) duct extraction method from the full 3D (F3D) simulations has been developed. Results obtained from the Q3D simulations are shown to largely reproduce the trends observed (isentropic Mach number variations and high-speed separation behaviour) in the 3D intake, substantially reducing the simulation time by a factor of 50. The agreement between the F3D and Q3D simulations is encouraging when the flow either fully attached or with modest levels of separation but degrades when the flow fully detaches. Results are shown to deviate beyond this limit since the captured streamtube shape (and hence the corresponding Q3D duct shape) changes with the mass flow rate. Interestingly, the drooped intake investigated in the current study is prone to earlier separation under crosswinds when compared to an axisymmetric intake. Implications of these results on the industrial nacelle lip design are also discussed. View Full-Text
Keywords: crosswind; nacelle; distortion; shock; boundary layer; quasi 3D design crosswind; nacelle; distortion; shock; boundary layer; quasi 3D design
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Yeung, A.; Vadlamani, N.R.; Hynes, T.; Sarvankar, S. Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges. Int. J. Turbomach. Propuls. Power 2019, 4, 25.

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