Assessment of propeller induced properties and active flow control using multiple image-based measurement systems

Multiple optical measurement techniques have been applied for the investigation of a propeller-wing wind tunnel model. The (half) wind tunnel model is equipped with a nine bladed propeller and its wing has active Coanda blowing over the whole span of the wing. The aim of the investigation is to gain understanding of the flow phenomena,...

Wing Wake Measurements at High Reynolds Numbers by Means of Cryo PIV

The wake flow of a high-lift aircraft model has been measured in the cryogenic transonic wind tunnel ETW using PIV. The wind tunnel, providing a 2.4 m wide and 2 m high test section, allows for measurements at the design point of the landing configuration, i.e. at a Reynolds number of 16.7 million and a Mach number of 0.2. To capture the wake...

Dual-Volume and Four-Pulse Tomo PIV using polarized laser light

A demonstration experiment and first assessment of a dual-volume and four-pulse tomo PIV system operating with two pairs of perpendicularly polarized laser light pulses and respective polarizing filters for separation of the scattered particle light is presented. The polarizing filters are placed in front of eight sCMOS double-frame cameras...

Three-Dimensional Flow Field Investigations on Pitching Low Aspect Ratio Wings at Low Reynolds Numbers

Three-dimensional, unsteady flow fields of a pitching low aspect ratio wing were measured by tomographic PIV [6] in air. The analysis of the vortex dominated flow field provides a deeper understanding of vortex interaction and three-dimensionality of the low Reynolds number (Re ? 10,000) flow. In order to recover the complete flow field the...

Tracking of vortices in a turbulent boundary layer

Eulerian and Lagrangian views of a turbulent boundary layer flow using time-resolved tomographic PIV

Coherent structures and their time evolution in the logarithmic region of a turbulent boundary layer investigated by means of 3D space–time correlations and time-dependent conditional averaging techniques are the focuses of the present paper. Experiments have been performed in the water tunnel at TU Delft measuring the particle motion within a...

Lagrangian and Eulerian views into a turbulent boundary layer flow using time-resolved tomographic PIV

Investigation of a turbulent spot and a tripped turbulent boundary layer flow using time-resolved tomographic PIV

In this feasibility study the tomographic PIV technique has been applied to time resolved PIV recordings for the study of the growth of a turbulent spot in a laminar flat plate boundary layer and to visualize the topology of coherent flow structures within a tripped turbulent flat plate boundary layer flow. The experiments are performed around ...