Accession Number : ADA118894

Title :   An Interferometric Investigation of the Near Design Point Flow over Supercritical Aerofoil BGK-1,

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Pollock,N

PDF Url : ADA118894

Report Date : Jan 1982

Pagination or Media Count : 45

Abstract : A recently developed laser interferometer was used to study the upper surface flow over supercritical aerofoil BGK-1 near its design condition. The tests were carried out at a chord Reynolds number of 1.65 x 1000000 with transition free and artificially fixed at various chordwise locations. The interferograms were analysed to produce instantaneous surface pressure distributions for comparison with conventional time averaged distributions obtained from surface tappings. The results show that the upper surface flow is unsteady with both fixed and free transition. They also indicate that artificially fixing transition in low Reynolds number tests does not produce an accurate simulation of the high Reynolds number flow for conditions near the design point. (Author)

Descriptors :   *Optical interferometers, *Supercritical airfoils, Transonic flow, Two dimensional flow, Wind tunnel tests, Flow visualization, Australia

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE