An experimental study of the two-dimensional transition from turbulent boundary layer over small backward-facing steps is presented in order to investigate the effect of the separation bubble behind the back-step on the aero-optical environment, as well as to demonstrate the capacity for characterizing complex flow fields using non-intrusive optical measurement techniques such as the Malley Pro...

Here we describe the implementation of a large-scale multicamera particle image velocity (PIV) measurement to resolve the large range of spatial scales prevalent in moderate to high Reynolds number turbulent boundary layers. The objective of these experiments is to capture instantaneous snapshots of recently discovered large coherent structures which are known to inhabit the log and outer regio...

The flow field of a radial wall jet created by the impingement of a round synthetic jet normal to a flat surface was characterized using hot-wire anemometry. In the synthetic wall jets the width of the outer layer was observed to increase linearly with the radial distance along the wall, while the local maximum velocity varied inversely. The synthetic wall jet exhibits self-similar behavior as ...

Fluid flow and convective heat transfer in rotor-stator configurations, which are of great importance in different engineering applications, are treated in details in this review. The review focuses on convective heat transfer in predominantly outward air flow in the rotor-stator geometries with and without impinging jets and incorporates two main parts, namely, experimental/theoretical methodo...

This study focuses on the flow field of a round synthetic jet issuing into a crossflow. Six cases are investigated in which the jet-to-freestream velocity ratios range between 2.8 and 8.3. This corresponds to a medium-to-strong transverse jet, which is characterized using both two-dimensional hot-wire anemometry and particle image velocimetry techniques. A self-similar model is developed for th...

Scaling laws and intermittency in the wall region of a turbulent flow are addressed by analyzing moderate Reynolds number data obtained by single component hot wire anemometry in the boundary layer of a flat plate. The paper aims in particular at the experimental validation of a new form of refined similarity recently proposed for the shear dominated range of turbulence, where the classical Kol...

Abstract. The evolution of the mean velocity and turbulence downstream wind turbine wakes within atmospheric boundary layer has been studied over past decades, but an analytical description is still missing. One possibility to improve comprehension this look into modeling turbulent bluff body wakes. There, by means streamwise scaling centerline deficit, nature inside a wake can be classified. I...

OBJECTIVES Our previous work has shown that the symmetric, smooth, convergent shape of the subglottis reduces turbulent airflow at the glottal entrance. Medialization thyroplasty may alter the glottal shape and is very likely to introduce some degree of glottal asymmetry, which could result in increased turbulence and a reduction in voice quality. This study reports the effects of medializing a...

An appealing concept for jet engine combustors is the Lean Premixed Prevaporized (LPP) combustor, which operates at high pressures. The low NO x emissions achieved by lean combustion are one of targets modern aircraft engines. However, these types can introduce thermoacoustic instabilities that potentially damage and reduce its lifespan. Since potential on fuel spray characteristics, i.e. mass ...

High-aspect-ratio (HAR) rectangular jets have attracted attention in automobile air conditioning (A/C) systems and turbulent jet applications owing to their excellent delivery mixing attractive interior design. Active flow control (AFC) of using plasma actuators (PAs) has proven be a promising technique because the actuator is simple, low energy consumption, can create features without interfer...