Accession Number : ADA289681

Title :   Oxygen Transfer Similitude for a Vented Hydroturbine. Water Operations Technical Support Program.

Descriptive Note : Final rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF CIVIL AND MINING ENGINEERING

Personal Author(s) : Thompson, Eric J.

PDF Url : ADA289681

Report Date : DEC 1994

Pagination or Media Count : 100

Abstract : Discharge from large impoundments of water, such as those found behind hydroelectric installations, can have major impacts on downstream water quality. Discharges from surface layers over spillways can significantly improve dissolved oxygen (DO) levels in tail waters. Conversely, discharges from lower hypolimnetic regions in a reservoir can release anoxic waters whose low DO can result in large-scale environmental damage. A new technology has been developed called the auto-venting turbine that aspirates air into hydroelectric turbine discharges in order to substantially improve release DO when it is needed. There is a great deal of research involved in determining the limits of effectiveness of oxygen transfer through auto-venting turbines, and improving the performance of early prototypes. Many preliminary investigations at several different locations failed to reveal a single best design for the auto-venting turbine. As a result current research efforts have gone toward designing and testing of turbine models and evaluation of the effectiveness of model runner configurations. (jg)

Descriptors :   *OXYGEN, *TURBINES, *TRANSFER, *HYDROELECTRICITY, *VENTS, ENVIRONMENTS, DAMAGE, MODELS, LAYERS, TAIL ASSEMBLIES, PROTOTYPES, SURFACES, INSTALLATION, RELEASE, WATER QUALITY, DISSOLVING, ANALOGIES, ANOXIA, SPILLWAYS.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE