Are Nearly all Tidal Stream Turbines Designs Wrong for the Pentland Firth? Stephen Salter Institute for Energy Systems University of Edinburgh

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Presentation transcript:

Are Nearly all Tidal Stream Turbines Designs Wrong for the Pentland Firth? Stephen Salter Institute for Energy Systems University of Edinburgh

No names, no pack drill.

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

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

Turbine in a duct:

Open flow field Duct

McAdam RA, Houlsby GT, Oldfield MLG. Experimental measurements of the hydrodynamic performance and structural loading of the transverse horizontal axis water turbine: part 1. Renewable Energy vol. 59 pp

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

NASA

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

Flow Impedance The determination of the water to flow despite the introduction of obstacles.

Flow Impedance The determination of the water to flow despite the introduction of obstacles. Ratio of head increase to flow-rate reduction.

Flow Impedance The determination of the water to flow despite the introduction of obstacles. Ratio of head increase to flow-rate reduction.

Flow Impedance The determination of the water to flow despite the introduction of obstacles. Ratio of head increase to flow-rate reduction.

Flow Impedance The determination of the water to flow despite the introduction of obstacles. Ratio of head increase to flow-rate reduction.

Flow Impedance The determination of the water to flow despite the introduction of obstacles. Ratio of head increase to flow-rate reduction.

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 = ?

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

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

GOOGLE IMAGES MoD order the stretcher bearers to be at the same end ?

No tip-to-hub velocity reduction No squeezing torque through a bearing. On-line shirt-sleeve access at the surface. Thousands of force lines. Contact-free gutter seal. Lots of space.

Are Nearly all Tidal Stream Turbines Designs Wrong for the Pentland Firth? Stephen Salter Institute for Energy Systems University of Edinburgh

Google images

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

Something for the simpletons

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

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

No names, no pack drill.

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