Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges
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 incl...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-08-01
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| Series: | International Journal of Turbomachinery, Propulsion and Power |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-186X/4/3/25 |
| _version_ | 1828190205746610176 |
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| author | Alex Yeung Nagabhushana Rao Vadlamani Tom Hynes Sumit Sarvankar |
| author_facet | Alex Yeung Nagabhushana Rao Vadlamani Tom Hynes Sumit Sarvankar |
| author_sort | Alex Yeung |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T08:17:34Z |
| format | Article |
| id | doaj.art-6343c2f077734d63bfc21370c8f34723 |
| institution | Directory Open Access Journal |
| issn | 2504-186X |
| language | English |
| last_indexed | 2024-04-12T08:17:34Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Turbomachinery, Propulsion and Power |
| spelling | doaj.art-6343c2f077734d63bfc21370c8f347232022-12-22T03:40:42ZengMDPI AGInternational Journal of Turbomachinery, Propulsion and Power2504-186X2019-08-01432510.3390/ijtpp4030025ijtpp4030025Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and ChallengesAlex Yeung0Nagabhushana Rao Vadlamani1Tom Hynes2Sumit Sarvankar3Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UKDepartment of Aerospace Engineering, IIT Madras, Chennai 600036, Tamil Nadu, IndiaDepartment of Engineering, University of Cambridge, Cambridge CB2 1PZ, UKDepartment of Aerospace Engineering, IIT Madras, Chennai 600036, Tamil Nadu, IndiaThis 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.https://www.mdpi.com/2504-186X/4/3/25crosswindnacelledistortionshockboundary layerquasi 3D design |
| spellingShingle | Alex Yeung Nagabhushana Rao Vadlamani Tom Hynes Sumit Sarvankar Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges International Journal of Turbomachinery, Propulsion and Power crosswind nacelle distortion shock boundary layer quasi 3D design |
| title | Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges |
| title_full | Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges |
| title_fullStr | Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges |
| title_full_unstemmed | Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges |
| title_short | Quasi 3D Nacelle Design to Simulate Crosswind Flows: Merits and Challenges |
| title_sort | quasi 3d nacelle design to simulate crosswind flows merits and challenges |
| topic | crosswind nacelle distortion shock boundary layer quasi 3D design |
| url | https://www.mdpi.com/2504-186X/4/3/25 |
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