Viscous Flowfields and Airframe Forces Induced by Two-Dimensional Lift Jets in Ground Effect.
Interim technical rept. 1 Feb 76-28 Feb 77,
MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
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The interaction of the lift jets and the ground is an important consideration with regard to the design of VTOL aircraft. A key element of this ground effect problem is turbulent jet entrainment, which causes otherwise static air to be set into motion and leads to aerodynamic loads on airframe surfaces. As a first step toward gaining an understanding of this phenomenon, a theoretical analysis of two-dimensional planar turbulent jet impingement flowfields has been undertaken. Lift jets emanating from flat and curved surfaces jets in close ground effect have been modeled using the the incompressible Reynolds equations in combination with a one-equation turbulence model. Distributions of the flow properties are computed as functions of Reynolds number based on jet exit properties and height of the jet exit plane above ground. Author
- Fluid Mechanics