Turbulence Modelling of the Aerodynamic Interaction of OGV Wakes and Diffuser Flow
In this paper different turbulence closures are used to predict the flow interaction between the wakes created by compressor Outlet Guide Vanes (OGVs) and a downstream annular pre-diffuser. Two statistical turbulence models are tested based on the classical Reynolds-Averaged Navier-Stokes (RANS) approach. Both high Re and low Re (Launder-Sharma) versions of the k-e model are applied to a selected test problem for OGV wake/diffuser flows. The test problem was specifically chosen because experimentally determined inlet conditions and both profile and performance data were available to validate predictions. A preliminary study is also reported of the more advanced Large Eddy Simulation (LES) approach. The LES Sub-Grid-Scale (SGS) model was the basic Smagorinsky eddy viscosity assumption, with a Van-Driest damping function for improved capture of near-wall viscous behaviour. Comparison between the two RANS models showed little difference in terms of velocity contours at OGV trailing edge and diffuser exit In terms of overall diffuser performance (static pressure recovery and total pressure loss coefficients), the high Re model is shown to agree well with experimental data. The preliminary LES study indicates the highly unsteady character of the OGV wake flow, but requires improved treatment of inlet conditions.
OGV wakes diffuser flow rans and les modelling
Jinghua Li Gary Page Jim McGuirk
Dept.of Aero, and Auto.Eng., Loughborough Univ.,Loughborough, LE11 3TU, UK
国际会议
The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)
南京
英文
218-225
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）