Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-22T10:18:20.607Z Has data issue: false hasContentIssue false
  • English
  • Français

Numerical modelling of unsteady flow in a twin side-by-side intake system

Published online by Cambridge University Press:  04 July 2016

D. M. Causon  and
D. M. Ingram
D. M. Causon
Affiliation:
Centre for Mathematical Modelling and Flow AnalysisThe Manchester Metropolitan UniversityManchester, UK
D. M. Ingram
Affiliation:
Centre for Mathematical Modelling and Flow AnalysisThe Manchester Metropolitan UniversityManchester, UK
Get access Rights & Permissions [Opens in a new window]

Abstract

The unsteady flowfield in a twin side-by-side intake arrangement arising as a result of a surge in one of the engines has been studied numerically by solving the Euler equations. Unsteadiness was introduced by prescribing a pressure disturbance at the exit plane of one of the intakes. The two cases considered correspond to static ground-running of the engines and a flight Mach number of 0.6 with a single rapidly increasing exit plane pressure disturbance representative of a pop surge. The amplitude of the imposed pressure disturbance varied between 100% and 200% of the mean exit static pressure. In the cases considered, the results indicate that static pressure attenuation of the propagating hammer shock occurs upstream of the intake entry plane, resulting in a relatively weak rarefaction wave travelling down the adjacent intake. No evidence of increased dynamic flow distortion likely to lead to a complementary surge in the adjacent engine was observed. These conclusions have been confirmed by available test data thus demonstrating the value of CFD techniques for modelling complex unsteady transient flow phenomena of this type.

Type
Research Article
Information
The Aeronautical Journal , Volume 101 , Issue 1008 , October 1997 , pp. 365 - 370
Copyright
Copyright © Royal Aeronautical Society 1997 

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. Marshall, F.I. Prediction of inlet overpressure resulting from engine surge, J Aircr, May 1973, 10, (5), pp 274–278.Google Scholar
2. Evans, P.J. and Truax, P.O. YF-16 air induction system design loads associated with engine surge, J Aircr, April 1975, 12, (4), pp 205–209.Google Scholar
3. Soeder, R.H. and Moss, J.E. Investigation of the stall hammer shock at the engine inlet, J Aircr, April 1975, 12, (4), pp 198–204.Google Scholar
4. Lotter, K., Mackrodt, P.A. and Scherbaum, R. Engine surge simulation in wind tunnel model inlet ducts, Paper 4.11.4, ICAS, 1988.Google Scholar
5. Hsieh, T., Wardlaw, A.B., Collins, P. and Coakley, T. Numerical investigation of unsteady inlet flowfields, J A1AA, 1987, 25, (1), pp 75–81.Google Scholar
6. Hsieh, T. and Wardlaw, A.B. Numerical simulation of unsteady flow in a ramjet inlet, 14th Congress of the International Council of the Aeronautical Sciences (ICAS), ICAS, 1984, ICAS Paper No 84-1.9.2, pp 1005–1014.Google Scholar
7. Bogar, T.J., Sajben, M. and Kroutil, J.C. Characteristic frequencies of transonic diffuser flow, J AIAA, 1983, 21, (9), pp 1232–1240.Google Scholar
8. Liou, M.S. and Coakley, T.J. Numerical simulation of unsteady transonic flow in diffusers, Paper 82-1000, AIAA, 1982.Google Scholar
9. Liou, M.S., Coakley, T.J. and Bergmann, M.Y. Numerical simulation of transonic flow in diffusers. Paper 81-1240, AIAA, 1981.Google Scholar
10. Sajben, M., Bogar, T.J. and Kroutil, J.C. Forced oscillation experiments in supercritical diffuser flows with applications to ramjet instabilities, Paper 81-1487, AIAA, 1981.Google Scholar
11. Salman, J.T., Bogar, T.J. and Sajben, M. Laser velocimeter measurements in unsteady separated transonic diffuser flows, Paper 81-1197, AIAA, 1981.Google Scholar
12. Thompson, J.F., Warsi, Z.A.U. and Wayne-Mastin, C. Numerical Grid Generation: Foundation and Applications, Elsevier Science Publishing, 1985.Google Scholar
13. Van Leer, B. On the relation between the upwind-differencing schemes of Godunov, Engquist-Osher and Roe, SIAM J Sci Stat Comput, March 1984, 5, (1), pp 1–20.Google Scholar
14. Harten, A., Lax, P.D. and Van Leer, B. On upstream differencing and Godunov-type schemes for hyperbolic conservation laws, SIAM Review, 1983, 25, (1), pp 35–61.Google Scholar
15. Batten, P., Ingram, D.M., Saunders, R. and Causon, D.M. A time-splitting approach to solving the Navier-Stokes equations, Comps and Fluids, 1996, 25, (4), pp 421–431.Google Scholar
16. Davis, R.L. and Dannenhoffer, J.F. Three dimensional adaptive grid embedding Euler technique, J AIAA, 1994, 32, (6), pp 1167–1174.Google Scholar
17. British Aerospace, Private communication.Google Scholar