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Technical Note: Simulation of Tiltrotor Fountain Flow Field Effects Using a Finite Volume Technique — An Aero‐Acoustic Study

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This paper presents the results from an aero‐acoustics analysis for a tiltrotor obtained by coupling an efficient Navier‐Stokes solver, RO'ITILT, with the acoustic code WOPWOP. The flow solver is finite volume based and solves the three dimensional, steady, laminar, incompressible equations in Cartesian coordinales. The acoustic code WOPWOP is an implementation of Farassat's linearized formulation 1A. Predicted and measured fountain velocities are presented for a 15 percent V‐22 semispan model. Predicted and measured aerodynamic performance and noise results are presented are for an XV‐15 tiltrotor vehicle in hover. A semi‐span configuration which includes the fuselage, wing, and nacelle is used to model a full vehicle. The trimmed solution includes the combined effect of the rotor and body. Thus the computation of rotor hlade airloads are determined for a given thrust, which includes this combined effect. The computed high resolution airloads are used as the input to the noise prediction program WOPWOP. The accuracy of the computed airloads, flow and noise are evaluated by comparing with measured acoustic flight data. The predicted results show fair but promising correlation with the available data.

Document Type: Research Article


Affiliations: The Boeing Company, Mesa, Arizona 85205-9797

Publication date: 1999-04-01

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  • 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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