TY - JOUR
AU - Flack, R D
AB - A method is described for discrete sampling type instruments to analyse the periodically time-dependent velocity fields found in turbomachines with elements rotating at different speeds. Velocity samples that are measured in the stationary frame are translated into the relative rotating frame and then organized by the relative angular position between all the independent elements of the turbomachine. At the instant of data acquisition the angular position of all independently rotating elements must be measured. Since the flow field is periodic, large velocity sample sizes can be obtained for every angular position combination of the elements of the turbomachine. By correct grouping and averaging the recorded samples, the unsteady flow field interaction of two or more components can be visualized. The technique was demonstrated for the turbine inlet flow field of an automotive torque converter using laser velocimetry. A torque converter has three components that are relevant to the flow field and which rotate at different angular speeds: pump, turbine and stator. The torque converter was tested for a turbine/pump speed ratio of 0.800. Throughflow velocity plots of the unsteady flow field are presented to demonstrate the method. A jet/wake region migrating through the turbine inlet plane at the pump-turbine blade interaction frequency is identified.
TI - A method to measure periodic velocity fields in multi-element turbomachines with discrete sampling
JF - Measurement Science and Technology
DO - 10.1088/0957-0233/5/4/016
DA - 1994-04-01
UR - https://www.deepdyve.com/lp/iop-publishing/a-method-to-measure-periodic-velocity-fields-in-multi-element-k0trN6BRLc
SP - 418
VL - 5
IS - 4
DP - DeepDyve
ER -