Aerofoils with a sinusoidal leading edge pattern have been the subject of the study during the recent decade due to its considerable effect on the aerodynamics performance. The leading edge variation results in the formation of streamwise counterrotating vortices which affect the boundary layer development on aerofoils. To understand the influence of the leading edge variation to the boundary l...

A scheme is proposed for correcting the hot-wire attenuation in turbulence measurements in both frequency and time domains. The scheme is tested for simulated hot-wire signals under velocity impulse and sinusoidal perturbations of various frequencies. It is found that the frequency response of the hotwire system and the calculated central moments, after applying the correction, can be greatly i...

The development of pre-set wavelength Görtler vortices are studied in the boundary-layer flows on concave surfaces of 1.0 and 2.0 m radius of curvature. The wavelengths of the vortices were pre-set by thin wires of 0.2 mm diameter placed 10 mm upstream and perpendicular to the concave surface leading edge. Velocity contours were obtained from velocity measurements using a single hot-wire anemom...

The present work considers the turbulent air flow inside an annular high speed rotor-stator cavity opened to the atmosphere at the periphery. The interdisk-spacing is sufficiently large so that the boundary layers developed on each disk are separated and the flow belongs to the regime IV of Daily and Nece (1960). In such a system, the solid body rotation of the core predicted by Batchelor in ca...

This paper describes HoLiSwap a method to reduce L1 cache wire energy, a significant fraction of total cache energy, by swapping hot lines to the cache way nearest to the processor. We observe that (i) a small fraction (<3%) of cache lines (hot lines) serve over 60% of the L1 cache accesses and (ii) the difference in wire energy between the nearest and farthest cache subarray can be over 6×. Ou...

To control the Karman vortex street formed behind a thin airfoil at a certain incidence, a control cylinder was placed at the suction side apart from the airfoil in the downstream region. Both smoke visualization and hot-wire measurements confirmed that the Karman vortex street was completely suppressed. The mechanism for suppression of the vortex street was examined with a hot-wire survey.

Abstract. The dynamic inflow effect denotes the unsteady aerodynamic response to fast changes in rotor loading due a gradual adaption of wake. This does lead load overshoots. objective paper was increase understanding that based on pitch step experiments 1.8 m diameter model wind turbine, which are performed large open jet tunnel ForWind – University Oldenburg. flow plane is measured with 2D la...

A synthetic jet is a flow that created by an actuator vibrating at specific frequency and amplitude. In this study the velocities propagation of jets have been measured using both circular single-wave orifice geometries. Axial velocity measurements in direction taken PCE 423 model hot wire anemometer. Also visualization has performed TiO2 surface oil to determine distributions radial direction....