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Direct measurement of velocity correlation functions using the Erdmann-Gellert rate correlation technique

1979; IOP Publishing; Volume: 12; Issue: 2 Linguagem: Inglês

10.1088/0022-3735/12/2/013

2051-5685

R. Vehrenkamp, Klaus Schätzel, G. Pfister, E. O. Schulz-DuBois,

Meteorological Phenomena and Simulations

By use of a modified laser Doppler anemometer set-up and a commercial digital correlator, velocity auto- and cross-correlation functions are measured directly. These functions determine time scales of velocity fluctuations as well as their first- and second-order statistics. The technique is demonstrated with flows of perfect time periodicity, i.e. Taylor vortices between rotating cylinders, and of a highly random nature, i.e. turbulence in an open flow channel.