Accession Number : ADA117427

Title :   Viscous Flowfields Induced by Three-Dimensional Lift Jets in Ground Effect.

Descriptive Note : Final technical rept. 1 Jul 79-30 Jun 80,

Corporate Author : MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO

Personal Author(s) : Bower,W W ; Peters,G R

PDF Url : ADA117427

Report Date : 01 Jul 1980

Pagination or Media Count : 71

Abstract : An important consideration for VTOL aircraft design is the aerodynamic interaction between the lift jets and the ground plane. In an effort to predict this phenomenon for two jets, a finite-difference solution of the three-dimensional conservation equations of fluid mechanics, in combination with a turbulence model, has been developed for the case of incompressible flow. The solution technique is applied to the normal and oblique impingement of equal- and unequal-strength jets in ground effect with fountain formation. Fluid properties that characterize the flowfields are presented, and computed results are compared with data for the ground plane pressure distribution, fountain flow direction, wall-jet properties, and stagnation line shape.

Descriptors :   *Vertical takeoff aircraft, *Short takeoff aircraft, *Ground effect, *Flow fields, *Lift, *Jet flow, Viscosity, Turbulence, Finite difference theory, Mathematical models

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE