Flow development behind a swirl generator in a hot-water standard measuring facility for large volume rates

• The flow development behind a swirl generator is shown.
• The prevailing flow condition is evaluated by means of characteristic values.
• Clear influences can still detect at a distance of 87 pipe diameters.
• The velocity field is measured by means of a Stereo Particle Image System.
• A gravimetric cold- and hot-water standard measuring facility is used.

The flow development behind a swirl generator according to EN 14154 of a gravimetric cold- and hot-water standard measuring facility is shown at different positions by measurements carried out using Stereoscopic Particle Image Velocimetry (SPIV). Hereby, the effects of the swirl generator downstream are shown, and the prevailing flow condition is evaluated by means of characteristic values.SPIV is suited as a fast and accurate measurement procedure for the high-resolution determination – temporally and spatially – of 3C velocity profiles in piping.