Computational assessment of flow through a high-flow nacelle bypass

Nishan Jain, Revathi Jambunathan, Daniel J. Bodony

Research output: Contribution to conferencePaperpeer-review


Sonic boom minimization is a challenge faced by the aviation community to enable highspeed civilian aircraft flying supersonically over populated land. One of the concepts proposed to reduce sonic boom incorporates a high-flow secondary nacelle bypass, to enclose the engine and its protrusions, to divert the flow around a gearbox through a set of inlet and exit guide vanes. To assess the flow quality within the bypass, computational and experimental studies were conducted and the present study focuses on the computational portion using traditional RANS-based methods. Three levels of geometric complexity were considered - the full engine, the aft vane sections, and one channel from the aft section - to evaluate global and local flow characteristics and to evaluate the influence of different turbulence models on the flow solutions. The aft vane calculations were conducted in "clean" and "vaned" configurations which correspond to experimental models whose data were used for validation purposes. Comparisons between the full engine and detailed single channel calculations show a weak dependence on the turbulence model used for the mean flow predictions as well as strong turbulence-shock interactions. The clean and vaned aft bypass section predictions exhibit reasonable agreement with the experimental data but show a stronger influence of the turbulence model on predictive accuracy due to a laminar-turbulent transition.

Original languageEnglish (US)
StatePublished - 2012
Event50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Nashville, TN, United States
Duration: Jan 9 2012Jan 12 2012


Other50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
Country/TerritoryUnited States
CityNashville, TN

ASJC Scopus subject areas

  • Aerospace Engineering


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