The development and upgrade of test installations, instrumentation and the data acquisition system of an existing turbofan engine test rig are described for an experimental program which was planned and initiated to investigate the transient unsteady operation of gas turbine engines with an emphasis on compressor operation. The objective of the program was to examine aerodynamic instabilities s...

A detailed numerical study has been carried out to investigate the effects of leadingedge protuberance as a novel flow-separation control-technique for vertical-axis-windturbine (VAWT). The aerodynamic performance stationary protuberanced blade and an associated H-type Darrieus VAWT made three blades were investigated using unsteady Reynolds-Averaged-Navier-Stokes (URANS) Implicit Large Eddy Si...

We propose a more conservative, physically-intuitive criterion, namely, the boundary enstrophy flux ( $BEF$ ), to characterise leading-edge-type dynamic stall onset in incompressible flows. Our results are based on wall-resolved large-eddy simulations of pitching aerofoils, with fine spatial and temporal resolution around onset. observe that $|BEF|$ reaches maximum within regime identified. By ...

Airfoil dynamic stall in incompressible flow is characterized by two interacting viscous phenomena: time-varying trailing-edge separation and the shedding of intermittent leading-edge-vortex structures. In current work, a physics based low-order method capable modeling interactions between phenomena developed with aim predicting only few empirical tuning parameters. Large computational datasets...

This research analyzes the dynamic stall progression in cross-flow turbine blades demonstrating effects of flow curvature and induced caused by 360 degree rotation along an axis perpendicular to freestream. knowledge contributes low-order modeling through a proper orthogonal decomposition velocity fields, also explores alternative control strategy intracycle variation rate that modifies propert...