Download - 018 Pro-Tide Presentation - Nijhuis€¦ · Title: 018 Pro-Tide Presentation - Nijhuis Author: lklip Created Date: 9/23/2013 10:14:25 AM Keywords ()

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Low Head Fish Friendly Turbine Design

for

Static and Dynamic Tidal Power

September 2013

FLOW TECHNOLOGIES – FAIRBANKS NIJHUIS

PENTAIR 2

FISH FRIENDLY TIDAL TURBINES

FAIRBANKS NIJHUIS‘ FISH-FRIENDLY TURBINE

• Bi-directional operation

• High efficiency at head differences ranging from 0. 2 – 3 [m]

• Minimal impact on marine life (fish, eel)

• Minimal impact of marine environment (corrosion, fo uling)

• High energy production

• Low manufacturing cost (modular design)

• Low operational cost (maintenance)

• High ratio of yield versus cost for the system

Turbine requirements for low head tidal power

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PENTAIR 3



Fish collision model

( )[ ] ][14

3 2)sin( −−≈ − δωeQ

Lnp

o

b

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Example prediction fish mortality

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First prototype developed by Pentair - Nijhuis

Fish-friendly (patented) turbine

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Mortality rates eels

Group Control Turbine, guide vane 30°

Turbine, guide vane open

Trial order 3 5 2 4 1 6

N eels recovered after trial 73 63 79 70 80 93

Fraction wild caught eel 0.64 0.73 0.71 0.69 0.70 0.71

Mean length [cm] 42.0 40.7 40.6 40.3 41.3 42.8

Length range (cm) 32-75 31-64 31-76 28-60 31-75 31-84

Direct mortality % 0 % 0 % 0 % 0 % 0 % 0 %

Normal swimming % * 100 % 100 % 100 % 100 % 100 % 100 %

Mortality after 96 h % 1.5 % 0 % 1.2 %

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Measured performance prototype

PENTAIR



Scale model ultra-low head tidal turbine

Design Properties:- Diameter = 0.5 [m]- Head = 1 ± 0.75 [m]- Flow = 1.40 ± 0.8 [m³/s]- Speed = 300 ± 100 [rpm]- Blade angles – fixed- Rotor pitch - ± 180 [degrees]

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Bi-directional rotor design

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Expected performance prototype

antconstQHQH ssss =⇒∝ 22 /,

antconstQHNQNH tttt =⇒∝∝ 22 /,,

System characteristic:

Turbine characteristic:

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PENTAIR 11



Prototype system and turbine

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FLOW TECHNOLOGIES – FAIRBANKS NIJHUIS