National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Hydraulic Model Vortex Study Grand Coulee Third Powerplant.

PB253138

Publication Date	1976
Personal Author	Ziegler, E. R.
Page Count	44
Abstract	Hydraulic model studies of the Grand Coulee Third Powerplant forebay indicated detailed vortex studies should be made. Vortex modeling is difficult because of lack of similitude between model and prototype. A literature search disclosed an Equal Velocity Method of vortex modeling and this method was used in this study. Without model trashracks, air-entraining vortices readily formed, and with model trashracks vortex action was reduced. Rafts, either floating or submerged, suppressed vortex formation. Investigations were made to determine the prototype area in the forebay that may be susceptible to vortex action and need raft protection. The report has 35 figures and gives a detailed description of the investigation.
Keywords	Hydroelectric power generation Water intakes Vortices Hydraulic models Penstocks Water filters Forebays Air entrainment Washington(State) Trashracks Grand Coulee Dam Columbia River
Source Agency	Bureau of Reclamation
NTIS Subject Category	50B - Civil Engineering
Corporate Authors	Bureau of Reclamation, Denver, Colo. Engineering and Research Center.
Document Type	Technical Report
NTIS Issue Number	197617

Hydraulic Model Vortex Study Grand Coulee Third Powerplant.

Hydraulic Model Vortex Study Grand Coulee Third Powerplant.
PB253138

Publication Date	1976
Personal Author	Ziegler, E. R.
Page Count	44
Abstract	Hydraulic model studies of the Grand Coulee Third Powerplant forebay indicated detailed vortex studies should be made. Vortex modeling is difficult because of lack of similitude between model and prototype. A literature search disclosed an Equal Velocity Method of vortex modeling and this method was used in this study. Without model trashracks, air-entraining vortices readily formed, and with model trashracks vortex action was reduced. Rafts, either floating or submerged, suppressed vortex formation. Investigations were made to determine the prototype area in the forebay that may be susceptible to vortex action and need raft protection. The report has 35 figures and gives a detailed description of the investigation.
Keywords	Hydroelectric power generation Water intakes Vortices Hydraulic models Penstocks Water filters Forebays Air entrainment Washington(State) Trashracks Grand Coulee Dam Columbia River
Source Agency	Bureau of Reclamation
NTIS Subject Category	50B - Civil Engineering
Corporate Authors	Bureau of Reclamation, Denver, Colo. Engineering and Research Center.
Document Type	Technical Report
NTIS Issue Number	197617