Accession Number : ADP006968

Title :   Boundary Layer Transition : Prediction, Application to Drag Reduction,

Corporate Author : OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES TOULOUSE (FRANCE)

Personal Author(s) : Arnal, D.

Report Date : MAR 1992

Pagination or Media Count : 59

Abstract : This paper describes the practical calculation methods which are currently available to predict the transition location in two- and three-dimensional flows. Emphasis is given to the problem of skin friction drag reduction on swept wings at subsonic and transonic speeds. The so-called en method, which is deduced from the linear stability theory is widely used in the case of natural transition, but simpler techniques (empirical criteria) are useful in more complex situations such as boundary layer tripping or leading edge contamination. The simulation of flight in wind tunnels is also discussed. Wind tunnel/flight correlation includes comparisons between the free stream disturbance environment, the transition Reynolds number and the n factor at transition onset.

Descriptors :   *DRAG REDUCTION, *SKIN FRICTION, *SWEPT WINGS, *BOUNDARY LAYER TRANSITION, BOUNDARIES, BOUNDARY LAYER, COMPARISON, CONTAMINATION, CORRELATION, DRAG, EDGES, ENVIRONMENTS, FLIGHT, FREE STREAM, FRICTION, LAYERS, LEADING EDGES, NUMBERS, PAPER, REDUCTION, REYNOLDS NUMBER, SIMULATION, STABILITY, STREAMS, THEORY, THREE DIMENSIONAL, TRANSITIONS, TUNNELS, VELOCITY, WIND, WIND TUNNELS, WINGS, COMPUTATIONS, TWO DIMENSIONAL FLOW, THREE DIMENSIONAL FLOW.

Subject Categories : Fluid Mechanics
      Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE