Transient velocity measurements in a turbomachine with independently rotating components

Klaus Brun; Ronald D. Flack

doi:10.1117/12.150533

6 August 1993 Transient velocity measurements in a turbomachine with independently rotating components

Klaus Brun, Ronald D. Flack

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150533
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

Abstract

A method was developed for burst type laser velocimeter systems to be used for the highly unsteady but periodic velocity fields found in multi-component turbomachines, in which the components rotate at different speeds. Velocity signals are measured in the stationary frame, translated into the rotating frame, and organized by the relative angular positions of all independent components of the turbomachine. This method requires the angular position of all rotating components of the turbomachine to be measured at the instant a velocity signal is processed by the LV system. Because the flow field is periodic, large sample sizes can be obtained for every instantaneous registration of the components of the turbomachine. By properly 'sorting' the recorded data, one is able to correlate unsteady interaction of two or more components. The method was applied to an automotive torque converter turbine inlet. A torque converter has three components that rotate at different speeds: pump, turbine, and stator. Tests were run for a turbine speed of 881 rpm and a pump speed of 1100 rpm. Results from the tests were used to produce a 'movie' with 37 'frames' of the time dependent three- directional velocity vector fields at a rotating turbine inlet passage as the upstream pump blade passed. A strong influence of the pump on the turbine inlet velocity field is shown. Namely, the jet-wake region generated by the pump is identified as an unsteady inlet condition to the turbine.

Citation Download Citation

Klaus Brun and Ronald D. Flack "Transient velocity measurements in a turbomachine with independently rotating components", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150533

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