Accession Number : AD0756801

Title :   Simulation D'un Accroissement du Nombre de Reynolds a L'aide de Rugosites sur une Maquette D'avion en Transsonique (Simulation on an Increased Reynolds Number by Roughness on Aircraft Models in Transonic Flow),

Corporate Author : OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES CHATILLON-SOUS-BAGNEUX (FRANCE)

Personal Author(s) : Vaucheret,Xavier

Report Date : 21 OCT 1971

Pagination or Media Count : 13

Abstract : A high level of Reynolds number is necessary for obtaining in a wind tunnel the aerodynamic characteristics of a transport aircraft in the transonic range. Simulating an increased Reynolds number with roughness set on an aircraft model is an inexpensive way to make use of existing wind tunnels. The influence of this roughness on the shock-boundary layer interaction pattern contributes to increase the lift gradient and to carry rearwards the neutral point. The parietal visualization technique using fluid paints, of which a few examples are shown in colour, is a practical means for investigating flow separation. This method helps to understand the working of roughness. (Author Modified Abstract)

Descriptors :   (*TRANSONIC WIND TUNNELS, OPERATION), (*TRANSPORT AIRCRAFT, *AERODYNAMIC CHARACTERISTICS), MODEL TESTS, REYNOLDS NUMBER, SIMULATION, SURFACE ROUGHNESS, BOUNDARY LAYER, FLOW SEPARATION, FLOW VISUALIZATION, PARTICLES, PAINTS, FRANCE

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE