Subsonic heated open-loop wind tunnel with temperature up to 400°C and a test section 0,250 x0,250 x 1,500m.
A flow rate of 50 m/s in the test section can be obtained at standard room temperature.
Analysis of atomization and evaporation of droplets in multiphase flow by use of Phase Dopler Anemometry (PDA) and shadowgraph imaging technique. The two sides are made of quartz glass to provide the best signal transmission quality for usage with any optical equipment e.g. PDA
Image shows a Custom build wind tunnel (in collaboration with Dinex A/S)
Phase Doppler Anemometry (Dantec - PDA) is a laser based measurement system to determine the droplet size- and velocity in a spray.
PDA is a technique based on the principle of light scattering interferometry. Two incident laser beams intersect and create a measurement volume. The frequency of the laser beams is proportional to the velocity of the particles, and the phase shift is physically linked to the particle diameter.
Particle Image Velocimetry (PIV) system for water is an optical measurement technique to determine the velocity field in a fluid.
The fluid is seeded by tracer particles, which is illuminated by a laser sheet, and the particles then scatter light towards a camera.
The camera records two images and the software are using cross-correlation to measure the displacement of the seeding particles in the flow plane and then calculate a velocity map for the whole field.
Figure shows Velocity pattern and distribution in a spray - Dantec Dynamics A/S
Shadowgraph imaging technique (Pyro Optic) is an optical technique for analyzing the morphology, shape and sizes of individual particles.
Close-up image of droplets in sprays
High speed camera analysis of jet break-up through an orifice at different time steps