Papers by Efstratios Saliveros
This dissertation describes an experimental investigation of the blade-vortex interaction (BVI) p... more This dissertation describes an experimental investigation of the blade-vortex interaction (BVI) phenomenon conducted at the University of Glasgow, Scotland, using a single blade, non-lifting rotor. The vortex is generated by a fixed split-wing mounted vertically upstream of the rotor disc and five circulatory vortex strengths are considered; 1.10, 2.20, 3.40, 5.10 and 6.70m2/s. The rotor blade is instrumented with highly sensitive miniature pressure transducers which assist in measuring time-dependent surface pressures as the blade passes through or very close to the vortex. Numerous "Parallel" BVI tests are carried out by altering the geometry of the test set-up in order to study the effects of blade-vortex proximity (Yv/c), circulatory vortex strength (T) and blade-radial variations (r/R). "Oblique" BVI tests are also performed, though of a much lesser extent, using similar test set-ups but for a vortex strength of 6.70m2/s. The blade-vortex proximity distance ...
In this experimental investigation, the performance and the boundary layer characteristics of the... more In this experimental investigation, the performance and the boundary layer characteristics of the NACA-4415 aerofoil section were examined for an incidence range of-5.10o~a~22.90o and for the Reynolds number range of 50,OOO~Re~600,OOO. Chordwise static pressure distributions were obtained, from which aerodynamic force and moment coefficients, namely CN, CT, and CMc/4, were calculated using a simple Trapezoidal Rule method. These pressure distributions proved to be useful for the identification and location of the various boundary layer phenomena which occurred around the aerofoil. The "surface oil" flow visualisation technique was also used and photographs were obtained to record the various flow states over the upper surface of the aerofoil. The nominal two-dimensional data obtained in this study were compared with those from other facilities and previously tested aerofoils at the University of Glasgow. These latter comparisons were for the GU25-5(11)8, GA(W)-l and NACA-0015 aerofoil sections.
Experiments in Fluids, 1993
The results of a Blade-Vortex Interaction (BVI) experiment are presented. The experiments were th... more The results of a Blade-Vortex Interaction (BVI) experiment are presented. The experiments were the second series to be carried out at Glasgow University (see Kokkalis and Galbraith 1986, 1987), and reflect improvement to the facility. These improvements have resulted in sufficient resolution to observe clear evidence of vortex passage and propagative disturbances caused by the BVI. Additionally the quality of the pressure data permitted a meaningful assessment of force and moment coefficients, and a clear correspondence between their detailed time histories was observed. The data obtained are also compared with the results of previous studies, and qualitative and quantitative similarities are discussed.
Flap System For An Aircraft, Method For Adjusting The Lift Of An Aircraft And Aircraft Comprising A Main Wing And At Least One Flap System
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Papers by Efstratios Saliveros