Laser Doppler Anemometry
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Integrated solutions in Laser Doppler Anemometry

Laser Doppler Anemometry (LDA) is the ideal measurement technique for the non-intrusive investigation of velocity and turbulence in gas or liquid flows. The applications described in this brochure demonstrate the wide relevance of LDA across the spectrum of scientific and industrial research. Aerodynamics Hydrodynamics Rotating machinery Combustion processes Verification of CFD models With the introduction of the new processors and the enhancements that have been added to BSA Flow Software, Dantec Dynamics maintains its leading position in flow measurement. With additional modules,...

The principles of Laser Doppler Anemometry A) LDA is a non-intrusive optical measurement technique for investigating velocities at a point in a flow. LDA can be used in any gas or liquid flow with optical access to the measurement point provided that micron-sized seeding particles are present. B) The measurements are performed at the intersection of two laser beams, where there is an interference fringe pattern of alternating light and dark planes. Seeding particles scatter the light, which appears to flash, as the particles pass through the bright planes of the interference pattern....

Aerodynamic experiments are often undertaken in wind tunnels. The objectives are measuring and reducing drag, minimising energy consumption, reduction of wind noise, optimisation of cooling and validation of Computational Fluid Dynamics (CFD) code. Applications include: • Car-body aerodynamics • Airflows in passenger compartments • Engine compartment flows • Aircraft model testing • Flows around helicopter rotors • Airflows around buildings and other structures Turbulence research • Industrial process flows Detailed information about field around the object under test can be obtained by...

Aircraft model testing New aircraft designs are extensively tested with models in wind tunnels before full-scale prototypes are built. Flow separation and wing-tip vortices are among the flow details studied. Airflows around buildings and other structures LDA measures flow reversals and three velocity components, making it an ideal method for studying the complex flows around ships, bridges, buildings and offshore structures. Flows around helicopter rotors Studies include the effect of different inflow characteristics and noise generation from the rotor blades. LDA measurements can be...

Hydrodynamics, rotating machinery and combustion Hydrodynamic experiments include the optimisation of the efficiency of fluid machinery, the avoidance of cavitation and the simulation of flows in rivers and along coasts, and many other applications. Applications include: ● Channel flows ● Pipe flows ● Sediment transport ● Mixing phenomena ● Ship hull design ● Cavitation studies on propellers/pump impellers ● Propulsion efficiency ● Wave research ● Coastal engineering Measurement in a hydrodynamic tunnel. Photo courtesy of ONERA, France. Channel flows Hydrodynamic channels and tunnels can be...

Measurement in an engine using Laser Doppler Anemometry. Photo courtesy of AVL-List GmbH, Austria. Investigation of the flow between the impeller blades of a pump. Photo courtesy of Grundfos A/S, Denmark. Flow-field analysis in the reaction zone of a wood-burning stove. Photo courtesy of the University of Stuttgart, Germany Measuring the velocity profile in the inlet of a flowmeter calibration rig.

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