The interaction of the lift jets and the ground is important consideration with regard to the design of VTOL aircraft. A key element of this ground effect problem is turbulent 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 combined theoretical and experimental analysis of two-dimensional turbulent jet impingement flowfields has been undertaken. Both planar and axisymmetric jets in close ground effect have been modeled using 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 hight of the jet exit plane above ground. For the planar impinging jet, flowfield properties are presented for various flow configurations, and comparisons are made with the computed distributions. (DePo)
Computations and measurements of two-dimensional turbulent jet impingement flowfields
Berechnung und Messung zweidimensionaler Stroemungsfelder turbulenter und aufprallender Luftstroemungen
TURBULENT SHEAR FLOWS. SYMPOSIUM ; 1 ; 3-8
1977
8 Seiten, 14 Bilder, 8 Quellen
Aufsatz (Konferenz)
Englisch
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