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Classical Lanchester -Betz theory An oversight An additional calculation Resolving these problems

Betz revisited Prof. Guy Houlsby Department of Engineering Science Oxford Tidal Energy Workshop sponsored by the Oxford Martin School 30 th March 2012. Classical Lanchester -Betz theory An oversight An additional calculation Resolving these problems Betz for an open channel. Calculation.

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Classical Lanchester -Betz theory An oversight An additional calculation Resolving these problems

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  1. Betz revisited Prof. Guy Houlsby Department of Engineering ScienceOxford Tidal Energy Workshopsponsored by the Oxford Martin School30th March 2012

  2. Classical Lanchester-Betz theory • An oversight • An additional calculation • Resolving these problems • Betz for an open channel

  3. Calculation Results

  4. Optimal conditions as

  5. PLAN view of channel

  6. Conclusions • Anomalies in the original Betz calculation can be resolved by treating it as the limiting case of a confined flow • Efficiency can be calculated • An “inner and outer” calculation is proposed for flow in a channel

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