Optimization of a diffuser/ejector for ultra low-head hydroelectric systems. Final report
An investigation of head augmentation for ultra low-head hydroelectric systems by use of an ejector in the diffuser, or draft tube, is described. A detailed analytical and experimental study of flow in the ejector, which consisted of a conical diffuser with a peripheral wall jet, was conducted. Based on these results, an overall system analysis was developed and compared with experimental results from a small, axial-flow turbine. Finally, a brief economic analysis was made to determine the advantage, if any, of the ejector system. It was determined that an appreciable increase in head could be achieved and predicted by the analysis. Under certain circumstances where excess flow is available, the increase in head would result in a significant decrease in turbine size and cost for a fixed power. However, for a limited flow rate, the increase in head would be offset by a decrease in output power, and there would be no economic advantage.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Mechanical Engineering
- DOE Contract Number:
- FC07-80ID12208
- OSTI ID:
- 6284967
- Report Number(s):
- DOE/ID/12208-T1; ON: DE83011251
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DIFFUSERS
OPTIMIZATION
LOW-HEAD HYDROELECTRIC POWER PLANTS
SMALL-SCALE HYDROELECTRIC POWER PLANTS
AUGMENTATION
CAPITALIZED COST
HYDRAULIC TURBINES
JETS
PENSTOCKS
COST
HYDROELECTRIC POWER PLANTS
MACHINERY
PIPES
POWER PLANTS
TURBINES
TURBOMACHINERY
130300* - Hydro Energy- Plant Design & Operation