Abstract
A three-component LDV system was built with the following features: 1. Three colors, 2. Forward scattering, 3. Direction determination, 4. Avalanche photodiodes, 5. Transient recorder, 6. Fast Fourier transform. With this equipment measurements in a free air jet and a turbulent methane nitrogen diffusion flame were made. The following quantities were determined on the axis and on some levels: velocities ui, spreading rate r(0.5·uc)/d, centerline velocity-decay u0/uc, Reynolds-stress tensor u′iu′j and all third order moments u′iu′ju′k. These quantities were normalized and compared with literature data and with Reynolds-stress model calculations. One of the main objectives of these measurements was the supply of exit velocity profiles because the predictions below the similarity region depend crucially on the boundary conditions. In this paper details of the equipment and of the data processing are explained and new results are shown.
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