Navier-Stokes Flowfield Computation of Wing/Rotor Interaction for a Tilt Rotor Aircraft in Hover
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Navier-Stokes Flowfield Computation of Wing/Rotor Interaction for a Tilt Rotor Aircraft in Hover

Navier-Stokes Flowfield Computation of Wing/Rotor Interaction for a Tilt Rotor Aircraft in Hover


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About the Book

The download on the wing produced by the rotor-induced downwash of a tilt rotor aircraft in hover is of major concern because of its severe impact on payload-carrying capability. A method has been developed to help gain a better understanding of the fundamental fluid dynamics that causes this download, and to help find ways to reduce it. In particular, the method is employed in this work to analyze the effect of a tangential leading edge circulation-control jet on download reduction. Because of the complexities associated with modeling the complete configuration, this work focuses specifically on the wing/rotor interaction of a tilt rotor aircraft in hover. The three-dimensional, unsteady, thin-layer compressible Navier-Stokes equations are solved using a time-accurate, implicit, finite difference scheme that employs LU-ADI factorization. The rotor is modeled as an actuator disk which imparts both a radical and an azimuthal distribution of pressure rise and swirl to the flowfield. A momentum theory blade element analysis of the rotor is incorporated into the Navier-Stokes solution method. Solution blanking at interior points of the mesh has been shown here to be an effective technique in introducing the effects of the rotor and tangential leading edge jet. Results are presented both for a rotor alone and for wing/rotor interaction. The overall mean characteristics of the rotor flowfield are computed including the flow acceleration through the rotor disk, the axial and swirl velocities in the rotor downwash, and the slipstream contraction. Many of the complex tilt rotor flow features are captured including the highly three-dimensional flow over the wing, the recirculation fountain at the plane of symmetry, wing leading and trailing edge separation, and the large region of separated flow beneath the wing. Mean wing surface pressures compare fairly well with available experimental data, but the time-averaged download/thrust ratio is 20-30 percent higher than the measur...


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Product Details
  • ISBN-13: 9781723230240
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 164
  • Spine Width: 9 mm
  • Width: 216 mm
  • ISBN-10: 1723230243
  • Publisher Date: 18 Jul 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 395 gr


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Navier-Stokes Flowfield Computation of Wing/Rotor Interaction for a Tilt Rotor Aircraft in Hover
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