Sökning: "unsteady"
Visar resultat 6 - 10 av 176 avhandlingar innehållade ordet unsteady.
6. Accurate physical and numerical modeling of complex vortex phenomena over delta wings
Sammanfattning : With this contribution to the AVT-113/VFE-2 task group it was possible to prove the feasibility of high Reynolds number CFD computations to resolve and thus better understand the peculiar dual vortex system encountered on the VFE-2 blunt leading edge delta wing. Initial investigations into this phenomenon seemed to undermine the hypothesis, that the formation of the inner vortex system relies on the laminar state of the boundary layer at separation onset. LÄS MER
7. Numerical simulation of viscous compressible flows applied to turbomachinery blade flutter
Sammanfattning : .... LÄS MER
8. Numerical computations of the unsteady flow in turbochargers
Sammanfattning : Turbocharging the internal combustion (IC) engine is a common technique to increase the power density. If turbocharging is used with the downsizing technique, the fuel consumption and pollution of green house gases can be decreased. LÄS MER
9. Numerical and Experimental study of shock boundary layer interaction in unsteady transonic flow
Sammanfattning : A prerequisite for aeroelastic stability prediction inturbomachines is the understanding of the fluctuatingaerodynamic forces acting on the blades. Unsteady transonicflows are complex because of mutual interactions betweentravelling pressure waves, outlet disturbances, shock motion,and fluctuating turbulent boundary layers. LÄS MER
10. Modelling of unsteady aerodynamics for aircraft design
Sammanfattning : This thesis present a simple mathematical prediction model for high angles of attack aerodynamics, including dynamic effects over delta wings, and an extension to full configuration. The model presented is intended for application in conceptual design and is extended to parameters identifications in preliminary design with validation against experimental data. LÄS MER