Hydraulic Water Pump Fishway Attraction Nozzle
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Solution Overview
Problem
Fish struggle to find hydroelectric power station fishways due to high water flow turbulence and velocity, which deters some species and makes ascent difficult, while increasing water flow to fishways reduces power plant efficiency and causes turbulence.
Innovation Solution
A hydraulically operated water pump system with a lure current nozzle aligned with a Venturi nozzle in the fishway channel, providing a controlled, high flow rate without excessive turbulence, using a small amount of headwater to create a guiding current for fish without significantly impacting power plant efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water flow from headwater is fed into the fishway to increase flow rate, then fish attraction is improved, but power plant performance is reduced and turbulence increases
Solution Approach 1:
A hydraulically operated water pump with attraction flow nozzle is introduced as an intermediary device in the transition from underwater to outlet channel. This pump uses a small amount of headwater (minimal energy loss) to create a concentrated jet flow that amplifies water movement in the fishway, achieving high flow rate without proportionally sacrificing power plant performance.
Solution Approach 2:
The invention employs hydraulic principles through the water pump and attraction flow nozzle system. The nozzle converts pressure energy into kinetic energy, creating a high-velocity jet that draws in surrounding water (entrainment effect), thereby multiplying the effective flow rate in the fishway while consuming minimal headwater.
2Quantity of substance
If additional water is fed into the fishway to create attraction effect, then fish guidance is improved, but turbulence increases which deters some fish species
Solution Approach 1:
The attraction flow nozzle creates a localized zone of controlled turbulence and high velocity precisely at the transition from underwater to outlet channel where fish need guidance. The turbulence is concentrated in this specific location rather than being distributed throughout the entire fishway, allowing fish to be attracted and guided without being overwhelmed by excessive turbulence during ascent.
Solution Approach 2:
The nozzle design changes the parameters of water flow by converting pressure into high-velocity jet flow. This creates a focused attraction current with specific velocity and turbulence characteristics that guide fish effectively while minimizing harmful turbulence effects in the broader fishway environment.
3Quantity of substance
If high flow rate is achieved in the fishway, then fish attraction is improved, but flow velocity becomes too high for fish to overcome
Solution Approach 1:
The attraction flow nozzle introduces flow in a specific directional dimension (focused jet along the fishway axis) that guides fish movement. By concentrating flow in this particular dimension rather than creating uniform high velocity throughout, the system achieves high flow rate for attraction while maintaining manageable velocity that fish can overcome during ascent.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Increases the flow rate in the fishway by a factor of at least 10, enhancing fish attraction and ascent probability while minimizing turbulence and maintaining power plant efficiency.
Implementation Method 1
a hydraulically operated water pump is provided in the transition from the underwater to the outlet channel, the hydraulically operated water pump comprising an attraction flow nozzle
Implementation Method 2
the axis of the jet from the lure current nozzle is aligned with the central longitudinal axis of a venturi nozzle in the channel or pipe section
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a system for amplifying the guiding flow in a fish ascent or descent device, wherein the system comprises a fish pass, the fish pass having an outlet channel (1) to the downstream area, wherein a water-carrying connection (3) in the form of a channel or pipe section (2) is provided between the downstream area and the outlet channel (1) of the fish ascent or descent device, the connection opening laterally into the outlet channel (1), wherein at least one hydraulically operated water pump (10) is provided in the transition from the downstream area to the outlet channel (1), wherein the hydraulically operated water pump (10) comprises an attraction stream nozzle (20), the attraction stream nozzle (20) being arranged upstream of the channel or pipe section (2) such that the axis of the jet from the attraction stream nozzle (20) is aligned with the central longitudinal axis of a Venturi nozzle in the channel or pipe section (2).and that the cross-section of the free jet of the attraction stream nozzle (20) corresponds approximately to the smallest cross-section in the venturi nozzle of the channel or pipe section (2).