A theory for the lift and pitching moment coefficients due to two-dimensional normal spoilers only erofoile flow na8 developed from that of Woods. in incompressible By making use of experiments on a symmetrical aerofoll fitted with epoilere, the displacement thickness of the boundary layer at the spoiler position and a measure of the pressure in the separated region behind the spoiler were take...

peace accords signed between 1988 and 1998, thirty-one failed to last more than three years.1 Contributing to their failure was the behavior of so-called spoilers: those who use violence or other means to undermine negotiations in the expectation that a settlement will threaten their power or interests.2 The stakes for understanding spoiler behavior are high. Where parties kept spoilers at bay,...

Abstract. A wind turbine blade equipped with root spoilers is analysed using time domain aeroelastic element momentum (BEM) simulations to assess the impact of passive devices on annual energy production (AEP) and lifetime. Previous 2D computational fluid dynamics (CFD) showed a large unsteadiness in aerodynamic coefficients associated spoiler, such behaviour captured by OpenFAST when all degre...

SUMMARY Two experimental glide path and flare systems are described, one using spoilers installed in the aircraft to provide direct lift control. The various longitudinal control modes, altitude hold, glide path and flare, have similar feedback control gains whose values were determined by parameter optimisation. An assessment of the performance of these two systems is described. Using elevator...