Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-22T06:32:59.399Z Has data issue: false hasContentIssue false
  • English
  • Français

Some aspects of the flow in S-shaped diffusing ducts

Published online by Cambridge University Press:  04 July 2016

S. C. M. Yu  and
E. L. Goldsmith
S. C. M. Yu
Affiliation:
School of Mechanical and Production EngineeringNanyang Technological University, Singapore
E. L. Goldsmith
Affiliation:
Formerly Royal Aerospace Establishment Bedford, UK
Get access Rights & Permissions [Opens in a new window]

Extract

The circular cross-sectional Royal Aerospace Establishment (RAE) 2129 S-shaped intake diffusing duct series, shown in Fig. 1, which has an offset of the inlet and exit centerline of 0·3 and 0·45 of the axial length of the duct, was designed at the RAE (Bedford) and tested at British Aerospace Filton, at low forward speeds (freestream Mach no. range from 0 – 0·2 but a range of duct inlet Mach numbers up to choking speeds) in the last two decades to fulfil the objectives of collecting systematic experimental data on engine face pressure recovery, total pressure flow distortion and wall static pressures for computational fluid dynamics validation. Some of the measurements have been presented, as for example, by Willmer, Brown & Goldsmith. The measurements from one version of Model 2129 (the 0·3 length offset S-duct geometry) have been used to compare with calculated results from a number of CFD programs, as for example, by Anderson, Horton and by the AGARD Working Group 13. The series of comparison also highlight the need for measurements other than the engine face total pressure and wall static pressure which have already been made.

Type
Technical Note
Information
The Aeronautical Journal , Volume 98 , Issue 978 , October 1994 , pp. 305 - 310
Copyright
Copyright © Royal Aeronautical Society 1994 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Willmer, A.C., Brown, W.R. and Goldsmith, E.L. Effects of intake geometry on circular pitot intake performance at zero and low forward speeds, Aerodynamics of Power Plant Installation, AGARD CP 301, Paper No. 5, 1981.Google Scholar
2. Anderson, B. CFD Application to subsonic inlet airframe integration, VKI Lecture Series on Intake Aerodynamics, 1988.Google Scholar
3. Horton, G.C. Prediction of viscous flow in combat aircraft engine air intake ducts, RAE TM PI 152, 1989.Google Scholar
4. Fluid Dynamics Panel Working Group 13: Air Intakes for High Speed Vehicles AGARD Advisory Report 270, 1991.Google Scholar
5. Whitelaw, J.H. and Yu, S.C.M. Turbulent flow characteristics in an S-shaped diffusing duct, Flow Measurements and Instrumentation, 1993, 4, (3), pp 171–179.Google Scholar
6. Whitelaw, J.H. and Yu, S.C.M. Velocity measurements in an S-shaped diffusing duct, Experiments in Fluids, 1993, 15, (4), pp 364–367.Google Scholar
7. Rojas, J., Whitelaw, J.H. and Yianneskis, M. Flow in sigmoid diffusers of moderate curvature, 4th Symposium on Turbulent Shearflows, 1983, Karlsruhe, Germany Google Scholar
8. Schmidt, M.C., Whitelaw, J.H. and Yianneskis, M. Flow in out-of- plane double S-bends, NASA CR 176981, 1986.Google Scholar
9. Yu, S.C.M. Flow Characteristics in S-Shaped Diffusing Ducts, PhD thesis, Imperial College of Science, Technology and Medicine, University of London, 1991.Google Scholar
10. Yu, S.C.M. Turbulent flow calculation in S-shaped diffusing ducts using a viscous marching technique, In: Computational Methods and Experimental Measurements, 1993, Ed. Brebbia, C.A. et al, Elsevier Applied Science, pp. 302–322.Google Scholar
11. Lee, K.M. and Yu, S.C.M. Computational studies of flows in the RAE 2129 S-shaped diffusing duct. 32th AeroScience Meeting and Exhibit, AIAA Paper no 940658, 1994.Google Scholar
12. Ho, S.S.H., Myrino, D.F. and Livesey, J.L. Flow development in S-shaped intake ducts. Proceedings of the Fourth Asian Congress of Fluid Mechanics, 1989, 11, Hong Kong.Google Scholar
13. Harloff, G.J., Smith, C.F., Bruns, J.E. and Debonis, J.R. Navier- Stokes analysis of three-dimensional S-ducts, J Aircr, 1993, 30, (4), pp. 526–533.Google Scholar
14. So, R.M.C. and Mellor, G.L. Experiments on convex curvature effects in turbulent boundary layers, J Fluid Mech, 1973, 60, pp 43–62.Google Scholar
15. Cumming, H.G. The secondary flow in curved pipes, NPL, UK Reports No. 2880, 1952.Google Scholar
16. Chang, S.M., Humphrey, J.A.C. and Modavi, A. Turbulent flow in a strongly U-bend and downstream tangent of square cross-sections. Physiochemical Hydrodynamics, 1983, 4, pp. 243–269.Google Scholar
17. Azzola, J., Humphrey, J.A.C, Iacovides, H. and Launder, B.E. Developing turbulent flow in a U-bend of circular cross-section measurements and computation, ASME J Fluids Engineering, 1986, 108, pp 214–221.Google Scholar
18. Anderson, B.H., Taylor, A.K.M.P., Whitelaw, J.H. and Yianneskis, M. Developing flow in S-shaped ducts. In: Proc Second International Symposium on the Application of L.D.A. to Fluid Mechanics, Lisbon, Portugal, 1982.Google Scholar