Viscous Flowfields and Airframe Forces Induced by Two-Dimensional Lift Jets in Ground Effect.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1977
- Accession Number
- ADA043518
Entities
People
- D. R. Kotansky
- W. W. Bower