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Assessment of Transition Models in Predicting Skin Frictions and Flow Field of a Full-Scale Tilt Rotor in Hover

Chunhua Sheng, Qiuying Zhao, The University of Toledo

May 17, 2016

https://doi.org/10.4050/F-0072-2016-11389

Abstract:
Two transition modeling methods are assessed for predicting the skin frictions and flow field of a full-scale, hovering XV-15 tiltrotor using an unsteady Reynolds-averaged Navier-Stokes (RANS) flow solver. The rotor Figure of Merit (FM) is predicted over a range of collective pitch angles at two tip Mach numbers: a design tip Mach number of 0.69 and a reduced tip Mach number of 0.56. Computed skin frictions are compared with the measured data at selected collective pitch angles of 3°, 10°, 14° and 16.6°. The Langtry-Menter γ - Reθt transition model is integrated into Spalart-Allmaras's one-equation turbulence model (SA-TM) as well as Menter's shear stress transport two-equation turbulence model (SST-TM). Both SATM and SST-TM transition models are assessed for predicting the laminar separation-induced transition and the mid-chord flow separation phenomena on the XV-15 rotor. A method to correct premature flow separation is introduced to improve the model's behavior in predicting the hover performance and flow field for the XV-15 rotor at high thrust levels. Predicted skin frictions and hover performance show strong conformity with the wind tunnel measurements.


Assessment of Transition Models in Predicting Skin Frictions and Flow Field of a Full-Scale Tilt Rotor in Hover

  • Presented at Forum 72
  • 20 pages
  • SKU # : F-0072-2016-11389
  • Aerodynamics

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Assessment of Transition Models in Predicting Skin Frictions and Flow Field of a Full-Scale Tilt Rotor in Hover

Authors / Details:
Chunhua Sheng, Qiuying Zhao, The University of Toledo