Effect of Particle Dynamics on Turbulence Measurements with the Laser Doppler Velocimeter
Final rept. 30 Jun 1984-30 Dec 1985
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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A numerical model for evaluating seed requirements for accurate turbulence measurements with the LV has been developed. A Monte Carlo turbulence model was developed which included an elementary description of the internal structure of an eddy. The model was applied to two simple turbulent flows, grid generated turbulence and a subsonic axisymmetric jet, to evaluate particle response and to establish particle size requirements for accurate LV measurements in these flows. Large monodisperse particles were found to cause the turbulence quantities to be underestimated, leading to a requirement for very small particles for meaningful turbulence measurements with the L.V. Rule of thumb criteria for particle size selection are developed. Keywords Velocity data Computer code Turbulence measurements laser velocimeter.
- Test Facilities, Equipment and Methods
- Fluid Mechanics