Temperature, Concentration Velocity and Turbulence Measurements in Jets and Flames.

摘要

The recently developed Laser Raman, Laser Doppler Velocimetry and Coherent Antistokes Raman Scattering are applied to the diagnostics of flow fields and flames. The concentration of species in a cold jet, and the velocities are measured and compared to measurements using standard techniques. The Raman and LDV techniques are then applied to diffusion flames. Experimental results concerning concentration of species, temperature, velocities and turbulent intensities are obtained simultaneously. The latter are obtained from the LDV data as well as the concentration data. It is seen that by proper processing of the concentration data an indication and a measure of the turbulent intensity may be obtained. It is further shown that from the simultaneously acquired concentration data a parameter of major importance in turbulence modeling, the mixedness parameter or the cross correlation function may be directly measured. (Author)