Flowfield of a Lifting Hovering Rotor: A Navier-Stokes Simulation PDF Download
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Author:
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Category : Navier-Stokes equations
Languages : en
Pages : 30
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Author:
Publisher:
ISBN:
Category : Navier-Stokes equations
Languages : en
Pages : 30
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Author: Ian G. Fejtek
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Category :
Languages : en
Pages : 162
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 866
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Author:
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Category : Military research
Languages : en
Pages : 274
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Author: Earl P. N. Duque
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Category : Navier-Stokes equations
Languages : en
Pages : 20
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Abstract: "This paper describes a new method for computing the flowfield and acoustic signature of arbitrary rotors in forward flight. The overall scheme uses a finite-difference Navier-Stokes solver to compute the aerodynamic flowfield near the rotor blades. The equations are solved on a system of overset grids that allow for prescribed cyclic and flapping blade motions and capture the interactions between the rotor blades and wake. The far-field noise is computed with a Kirchhoff integration over a surface that completely encloses the rotor blades. Flowfield data are interpolated onto this Kirchhoff surface using the same overset-grid techniques that are used for the flowfield solution. As a demonstration of the overall prediction scheme, computed results for far-field noise are compared with experimental data for both high-speed impulsive (HSI) and blade-vortex interaction (BVI) cases. The HSI case showed good agreement with experimental data while a preliminary attempt at the BVI case did not. The computations clearly show that temporal accuracy, spatial accuracy and grid resolution in the Navier-Stokes solver play key roles in the overall accuracy of the predicted noise. These findings will be addressed more closely in future BVI computations. Overall, the overset-grid CFD scheme provides a powerful new framework for the prediction of helicopter noise."
Author: United States. Superintendent of Documents
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Category : Government publications
Languages : en
Pages : 664
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Author:
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Category : Aeronautics
Languages : en
Pages : 538
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Author: J. F. Brouckaert
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Category : Wind turbines
Languages : en
Pages : 606
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1638
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