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Blade‐Vortex Interaction Airloads Prediction Using Coupled Computational Fluid and Structural Dynamics

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Abstract:

Correlations using a computational fluid dynamics code and rotorcraft computational structural dynamics code were made in order to calculate the helicopter rotor blade‐vortex interaction airloads for descending forward flight. An iterative loosely coupled trim methodology was used to couple the computational fluid dynamics (OVERFLOW‐2) and computational structural dynamics (CAMRAD II) codes. The OVERFLOW‐2 code used a high‐fidelity Reynolds averaged Navier‐Stokes, overset grid methodology. Several descending flight cases were used for correlation including UH‐60A, HART I and HART II at an advance ratio of 0.15. The computational fluid dynamics grid resolution effect on airloads was also examined. Results were compared with flight data or wind tunnel data, and the computational fluid dynamics/computational structural dynamics coupled trim methodology was found to be stable, convergent, and robust with coupling of normal force, pitching moment, and chord force. In comparison with the measured data, the normal forces were well predicted, and the higher harmonic blade‐vortex interaction loading predictions were excellent, especially for the HART II rotor. Overall, the use of a computational fluid dynamics code provides a noteworthy improvement over the lifting line aerodynamics used in the rotorcraft comprehensive analysis codes.

Document Type: Research Article

DOI: http://dx.doi.org/10.4050/JAHS.52.318

Affiliations: Aeroflightdynamics Directorate (AMRDEC), US Army Research, Development and Engineering Command, Ames Research Center, Moffett Field, CA

Publication date: October 1, 2007

More about this publication?
  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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    Authors can find submission guidelines and related information on the AHS website.

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