Modeling and control for axial ow compression systems have received great attention in recent years. The objectives are to suppress rotating stall and surge, to extend the stable operating range of the compressor system, and to enlarge domains of attraction of stable equilibria using feedback control methods. The success of this research eld will signiicantly improve compressor performance and ...

Herein, the pressure-sensitive paint (PSP) was used to quantitatively investigate aerodynamic effect of an alula-like vortex generator, which is a bio-inspired passive flow control structure. The global pressure distributions on upper surface at different angles attack were measured determine strength sectional suction forces wing. An generator equipped leading edge wing enlarged area region (n...

In order to explore the internal relationship between stall core propagation and flange leakage flow in rotating of a mixed-flow pump, based on k-? turbulence model, SIMPLEC algorithm hexahedral structured grid are used simulate field pump. By setting clearance as 0.2 mm, 0.5 mm 0.8 characteristics unsteady pump under condition near studied, influence pressure fluctuation is analyzed. The resul...

The use of Active Flow Control (AFC) technologies to modify the forces acting on streamlined bodies is one most active research fields in aerodynamics. For each particular application, finding optimum set AFC parameters which maximises lift, minimises drag or lift-to-drag ratio (aerodynamic efficiency), has become a necessary design requirement. In present paper, technology was applied Selig-Do...

This paper proposes a linear parameter varying (LPV) model reference-based control for fixed-wing unmanned aerial vehicles (UAVs), which achieves agile and high performance tracking objectives in extended flight envelopes, e.g. when near stall or deep stall flight conditions are considered. Each of the considered control loops (yaw, pitch and airspeed) delivers an error model that can be reshap...

The unsteady separated turbulent flow around an oscillating airfoil pitching in a sinusoidal pattern in the regime of low Reynolds number is investigated numerically employing the URANS approach with two advanced turbulence models, namely the RNG kmode and Transition SST model, and the DES approach based on the SST kmodel. A comparison with experimental data shows that the SST kbased D...

Deciphering the mechanisms by which proteins fold remains a substantial challenge for structural biology. In particular, very little is known about cotranslational folding, a process in which folding begins as the nascent protein is still emerging from the ribosome. Recognizing the dearth of methods to study this early folding event, Clark and colleagues present a strategy to stall protein tran...