Two Ideas to Regain the Power Otherwise Lost in Run-off River Schemes with Elevated Powerhouses
For run-off schemes, floods often require powerhouses to be set back from the riverbanks. This raising of the level of the powerhouse frequently curtails much of the potential head. Two low-cost proposals for such run-off schemes are presented. One proposal is a draft tube combined with a longitudinal baffle wall in the tailrace, which regains much of the power otherwise lost in the tailrace. The second proposal described is a new way of controlling the water level inside draft tubes. Both methods increase the output power for a given head.
Series: Practical Answers
Published: 2025
Pages: 8
eBook: 9781835768938
| Introduction | |||
|---|---|---|---|
| 1. Background | |||
| 1.1 Conicity of Draft Tubes | |||
| 1.2. Clearance below Draft-Tubes | |||
| 1.3. Use of Rounded Edge Draft Tubes | |||
| 2. Stabilizing Water Level in the Tailrace | |||
| 2.1. Joining the Tailrace to the River Further Downstream | |||
| 2.2. Flooding | |||
| 2.3. Settling of debris below draft tube | |||
| 3. Stabilizing the Water Level in the Draft Tube Using Cross-flow Turbines | |||
| 3.1. An Alternative Float Based Control System | |||
| 4. Conclusion | |||
| 8. References |
Steen Carlsen
Steen Carlsen is an electronics engineer, and founder of Carlsen Power Electronics.
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