Abstract
A numerical investigation of the flow field in a short, diffusing S-duct inlet was conducted. The study was carried out in the turbulent flow where Reynolds number is 777,000, and the inlet duct had a length-to-hydraulic diameter ratio of 5.8. The primary discussion herein focuses on flow analysis and development of secondary flow in the S-duct diffuser inlet. The flow field exhibited massive flow separations and shear layer formations at both turns of the compact inlet. Moreover, secondary flow structures along the duct’s lower surface and along the duct’s side walls were identified. It was shown that the two counter-rotating flow structures along the duct’s lower surface resulted in high levels of total pressure loss at the aerodynamic interface plane. A commercial CFD code, ANSYS Fluent, is used for the simulations. In this numerical study, three different RANS turbulence models (k-e Realizable, k-w SST, and Spalart-Allmaras) were selected to capture fully turbulent flow field. Numerical results, including surface static pressure and total pressure recovery at outlet, are compared with the experimental results carried out in the literature, and fairly good agreement is apparent.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Abbreviations
- AIP:
-
Aerodynamic interface plane (duct engine face)
- H:
-
Offset [m]
- L:
-
Length [m]
- M:
-
Mach number
- ṁ:
-
Mass flow rate [kg/s]
- p:
-
Static pressure [Pa]
- P:
-
Total pressure [Pa]
- PR:
-
Pressure recovery
- q:
-
Dynamic pressure [Pa]
- s:
-
Centerline length [m]
- T:
-
Temperature [K]
References
Wellborn, S.R., Reichert, B.A., Okiishi, T.H. (1992). An experimental investigation of the flow in a diffusing S-duct. 28th Joint Propulsion Conference and Exhibit. 6–8 July, Nashville, AIAA-92-3622.
Harloff, G.J., Reichert, B.A., Wellborn, S.R. (1992). Navier-Stokes analysis and experimental data comparison of compressible flow in a diffusing s-duct. AIAA Paper 92–2699.
Harloff, G.J., Reichert, B.A., Wellborn, S.R. (1992). Navier-Stokes analysis and experimental data comparison of compressible flow in a diffusing s-duct. 13th International Conference on Numerical Methods in Fluid Dynamics. 6–10 July, Rome, AIAA-92-3622.
Wellborn, S. R., Reichert, B. A., & Okiishi, T. H. (1993). A study of the compressible flow through a diffusing s-duct. Washington, DC: National Aeronautics and Space Administrations., NASA TM-10641.
Wellborn, S. R., Reichert, B. A., & Okiishi, T. H. (1994). Study of the compressible flow in a diffusing S-duct. Journal of Propulsion and Power, 10(5), 668–675.
Aslan S., Yilmazturk S., Kurtulus D.F. (2015). Aerodynamic investigation of a serpentine inlet design for a micro-turbojet engine powered aircraft, International Symposium on Sustainable Aviation, Istanbul.
Air intakes for high speed vehicles, AGARD-AR-270, September 1991.
Application of CFD to high offset intake diffusers, GARTEUR AD/AG-43, October 2012.
Wendt, J. F., & Anderson, J. D. (2009). Computational fluid dynamics: An introduction (3rd ed.pp. 15–51). Berlin: Springer.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG
About this chapter
Cite this chapter
Aslan, S., Kurtulus, D.F., Hepkaya, E., Yilmazturk, S. (2018). Numerical Investigation of a Serpentine Inlet Validated with Experimental Results for Different Turbulence Models. In: Karakoç, T., Colpan, C., Şöhret, Y. (eds) Advances in Sustainable Aviation. Springer, Cham. https://doi.org/10.1007/978-3-319-67134-5_9
Download citation
DOI: https://doi.org/10.1007/978-3-319-67134-5_9
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-67133-8
Online ISBN: 978-3-319-67134-5
eBook Packages: EnergyEnergy (R0)