Model Study of the Inlet and Sump of the Clinton First Avenue Pump Station,
Abstract
A 1:7 - scale model of the inlet and sump of the Clinton First Avenue Pump Station was constructed, comprising the new approach channel to the station, the pump bays and forebay, the pump sumps and bells, and the approach conduit to the existing station. It was found that the 45-degree angle at which the flow is diverted from the approach channel into the two new pump sumps produces a large dead-water zone in the forebay and results in pronounced dips in the magnitude of the velocity in the pump bays and sumps, occurring toward the centerwall dividing the bay area. Captive eddies in the pump sumps due to this velocity nonuniformity were not detected, however, and neither were vortices originating at the free surface. On the other hand, thin vortices originating off the converging side walls of the sumps were visualized. The vortices were rather stable in position and somewhat intermittent in time. The pressure fluctuations on the side walls associated with the vortices were found to be considerable, but pressure fluctuations elsewhere on the sumps boundaries were negligible. Baffle arrangements using only few baffles and avoiding narrow passages where trash accumulations could result in obstruction of the flow were developed to improve the uniformity of the approach flows to the sumps. The baffle arrangements did not eliminate completely the side wall vortices, whose strength, frequency of occurrence, and duration of persistence were found to be related to the conditions of the approach flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1976
- Accession Number
- ADA035343
Entities
People
- Cesar Farell
Organizations
- University of Iowa