Observations of Velocity Conditions near a Hydroelectric Turbine Draft Tube Exit using ADCP Measurements

Journal Article · Mon Oct 01 00:00:00 EDT 2007 · Flow Measurement and Instrumentation, 18:148-155

DOI:https://doi.org/10.1016/j.flowmeasinst.2007.04.002· OSTI ID:920202

Cook, Christopher B; Richmond, Marshall C; Serkowski, John A

Measurement of flow characteristics near hydraulic structures is an ongoing challenge because of the need to obtain rapid measurements of time-varying velocity over a relatively large spatial domain. This paper discusses use of an acoustic Doppler current profiler (ADCP) to measure the rapidly diverging flow exiting from an operating hydroelectric turbine draft tube exit. The resolved three-dimensional velocity vectors show a highly complex and helical flow pattern developed near to and downstream of the exit. Velocity vectors were integrated across the exit and we computed an uneven percentage of flow (67%/33%) passing through the two draft tube barrels at a mid-range turbine discharge, consistent with physical model results. In addition to the three-dimensional velocity vectors, the individual one-dimensional velocities measured by each of the four ADCP beams can be separately used as calibration and validation datasets for numerical and physical models. This technique is demonstrated by comparing along-beam ADCP velocity measurements to data collected in a scaled physical model.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 920202
• Report Number(s): PNNL-SA-52539; 400403209
• Journal Information: Flow Measurement and Instrumentation, 18:148-155, Journal Name: Flow Measurement and Instrumentation, 18:148-155
• Country of Publication: United States
• Language: English