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Second Oxford Tidal stream Workshop 2013 Are Nearly all Tidal Stream Turbines Designs Wrong? Stephen Salter Institute for Energy Systems University of.

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Presentation on theme: "Second Oxford Tidal stream Workshop 2013 Are Nearly all Tidal Stream Turbines Designs Wrong? Stephen Salter Institute for Energy Systems University of."— Presentation transcript:

1 Second Oxford Tidal stream Workshop 2013 Are Nearly all Tidal Stream Turbines Designs Wrong? Stephen Salter Institute for Energy Systems University of Edinburgh

2 No names, no pack drill.

3 ... just like wind turbines but under water. Frederick Lanchester Albert Betz

4 Unswept flow passage ≡ leaky pipes ≡ Vortex wake pollution ≡ Ignorance of flow angles

5 O’Doherty DM. Mason-Jones A, Morris C, O’DohertyT, Bryne C, Pricket PW, Grosvenor RI. Interaction of marine turbines in close proximity. EWTEC 2011

6 O’Doherty DM. Mason-Jones, Morris, O’DohertyT, Bryne, Pricket, Grosvenor. Interaction of Marine Turbines in Close Proximity. EWTEC 2011

7 R.A. McAdam, G.T. Houlsby, M.L.G Oldfield. Structural and Hydrodynamic Model Testing of the Transverse Horizontal Axis Water Turbine. EWTEC 2011

8 R.A. McAdam, G.T. Houlsby, M.L.G. Oldfield Structural and Hydrodynamic Model Testing of the Transverse Horizontal Axis Water Turbine EWTEC 2011

9 Open flow field Duct

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11 Bending moment at blade root s=en&tbm=isch&tbo=u&source=univ&sa=X&ei=BOBOUbPSJY6o0wXh2ICIBw&ved=0CE IQsAQ&biw=1042&bih=1505

12 GOOGLE IMAGES

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14 NASA

15 Edinburgh vertical-axis, variable-pitch with rim power take off. EWTEC Patras 1998

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17 Pitch variation gives control of rotor forces Contra-rotation cancels cross force and torque reaction in wake

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22 Work goes through restricted passage to congested generation space

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31 Second Oxford Tidal stream Workshop 2013 Are Nearly all Tidal Stream Turbines Designs Wrong? Stephen Salter Institute for Energy Systems University of Edinburgh

32 Google images

33 Speed up x 30 Range up x 6000 Payload up x 20,000 Cost per ton-mile down ÷ 100 Google images

34 Something for the simpletons

35 Laminaria Hyperborea (kelp) are found along the edges of the Pentland Firth at depths up to 30 m. Length can reach 3.5 metres. Cf = ? Google images.

36 Pentland bed stills. P Hayes. Fisheries Research Aberdeen mm bob

37 Friction coefficients for Fshear = 0.5 ρ U 2 Cf TW x 0.04 = 247 GW

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39 Edinburgh vertical-axis, variable-pitch with rim power take off. EWTEC Patras 1998

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