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CFD based study of unconventional aeroengine exhaust systems

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conference contribution
posted on 2012-08-30, 09:10 authored by Tim Coates, Gary J. Page
The effect of upstream duct curvature on the exhaust plume of a jet engine is cur- rently undocumented. Here, three different upstream curvatures are simulated using CFD to investigate the effect of upstream duct curvature on the over-expanded exhaust plume emanating from a rectangular nozzle of aspect ratio 5.8:1 at a nozzle pressure ratio of 2.5 and Reynolds number of 7.61 × 105. Due to the lack of available experimental data for curved ducts connected to high speed jets, the initial work was to validate the methodol- ogy for separate S-bend and rectangular nozzle high speed jet cases. These showed that RANS methods were poor for predicting secondary flows in the S-bend and for predicting mixing and potential core length in the rectangular jet. However, LES did show signifi- cant improvements for the rectangular jet and correctly predicts the shear layer mixing. Calculations were carried out using an unstructured, median-dual CFD solver with pre- dominantly hexahedral elements containing approximately 65.5−67.5 million nodes. For the combined S-bend and nozzle cases it was seen that increasing upstream duct curvature re- duces the potential core length and increases losses in the upstream duct. Transverse total pressure gradients were also observed at the nozzle exit plane in both k-ǫ and WALE LES turbulence models, however to a significantly smaller degree in the latter. The upstream duct curvature was also seen to have an impact on the shock cell development, altering both number and location.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Aeronautical and Automotive Engineering


COATES, T.D. and PAGE, G.J., 2012. CFD based study of unconventional aeroengine exhaust systems. 30th AIAA Applied Aerodynamics Conference, New Orleans, 2012, AIAA 2012-2775 27 pp.


Published by the American Institute of Aeronautics and Astronautics, Inc. © the author(s)


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This paper was presented at the 30th AIAA Applied Aerodynamics Conference 25 - 28 June 2012, New Orleans, Louisiana.


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