Physical Modeling to Develop Approach Velocities at Trashrack Intakes

摘要

Three phases of testing were undertaken, each beginning with the as-built trashrack in place to establish baseline intake velocity and head loss conditions. Each phase of testing incorporated different river tail-water, pump bay discharges and/or pump bay geometry. In each phase of testing, baseline conditions were used to inform researchers where areas of noncompliant velocity zones were located and to subsequently design and install backer plate arrangements for testing. This iterative process was repeated until a compliant velocity field and head loss conditions were achieved. The findings of this study can be used in operational logic of the future pumps to limit flows and maintain inlet trashrack criteria. This has not yet been implemented at Priest Rapids Dam.