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Perforated slat trawl door

A perforated plate and net plate technology, which is applied in the field of trawl net plates, can solve problems such as unsatisfactory dynamic stall control methods, and achieve the effects of increased stability, low noise generation, and increased opening force

Inactive Publication Date: 2010-03-31
HAMPIDJAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aforementioned '331 patent states that all previously proposed methods of dynamic stall control are unsatisfactory

Method used

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  • Perforated slat trawl door
  • Perforated slat trawl door
  • Perforated slat trawl door

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] figure 1 The perspective view in FIG. 2 shows an improved trawl panel generally indicated by the reference numeral 20 in accordance with the invention disclosed herein. The trawl panel 20 includes a main deflector 22 having a leading edge 24 and a trailing edge 26, such as figure 2 The profile of the trawl panel 20 depicted in . shown in Figure 1-3 In the embodiment of the trawl mesh panel 20, the main deflector 22 is formed by an arched steel plate. For the figure 2 For a particular profile, the maximum thickness 28 of the primary deflector 22 is approximately midway between the leading edge 24 and the trailing edge 26 . The steel plates forming the main deflector 22 have an arcuate inner surface 32 and an outer arcuate surface 34 which respectively span a chord 36 of the main deflector 22 which extends between the leading edge 24 and the trailing edge 26 . The trawl panel 20 also preferably includes a leading edge lift stiffening structure consisting of a pair...

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PUM

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Abstract

A trawl door (20, 60) or a paravane (120, 140) having at least one main deflector (22, 22U, 22L) includes a permeable structure disposed adjacent to and separated from an outer surface (34) of the main deflector (22, 22U, 22L). The permeable structure extends from near a trailing edge (26, 26U, 26L) of the main deflector (22, 22U, 22L) over and separated from the outer surface (34) toward the maindeflector's leading edge (24, 24U, 24L). In one embodiment of the permeable structure, a plurality of apertures (54, 56) pierce a perforated slat (52, 52U, 52L) thereby establishing a porous surfaceadjacent to the outer surface (34) of the main deflector (22, 22U, 22L). Adding the permeable structure perforated slat (52, 52U, 52L) to a trawl door (20, 60) increases the trawl door's stability when the trawl door is towed through water at a high angle of attack, and also reduces the trawl door's drag when operating at a high angle of attack.

Description

technical field [0001] The invention disclosed herein relates generally to trawl panels, and more particularly to trawl panels configured to operate stably and more efficiently at high angles of attack. Background technique [0002] A trawl is a large net, in the shape of a truncated cone, that is dragged through the water column or along the seafloor to collect marine life, including fish. Various methods and apparatus for deploying a trawl net behind a moving tugboat are well known, such apparatus being sometimes referred to as "trawl panels". Typically, the trawl panel is attached to the tugboat by a single main towing cable or other towing line fastened to the trawl panel near or at the midpoint of the trawl panel. The trawl net is then attached to the trawl panel at or near its opposite ends by a pair of traction chains, ie upper and lower traction chains, fastened respectively to the trawl panel. Trawl panels are sometimes called by other names, the most common being...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K73/045
CPCA01K73/045
Inventor V·G·佩列沃希科夫S·A·萨夫瓦特
Owner HAMPIDJAN
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