Pointwise and scanning laser anemometer measurements in steady and unsteady separated turbulent boundary layersThe physical features of steady and unsteady freestream separating turbulent boundary layers that have been determined by pointwise laser anemometer measurements are outlined. It is seen that the large-scale structures control the outer region's backflow behavior. Near the wall, the mean backflow velocity profile for both the steady and unsteady cases is found to scale on the maximum negative mean velocity and its distance from the wall. A description is given of a scanning laser anemometer that produces nearly instantaneous velocity profiles for examing the temporal features of these large-scale structures. Also described is a 'zero-wake' seeder that supplies particles to the outer shear layer and freestream flow with a minimal disturbance.
Document ID
19840045938
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simpson, R. L. (Southern Methodist Univ. Dallas, TX, United States)
Chehroudi, B. (Southern Methodist Univ. Dallas, TX, United States)
Shivaprasad, B. G. (Southern Methodist University Dallas, TX, United States)