JP2001328587A - Hull structure and air resistance reducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reducing load to a device generating power by suppressing air resistance to a low degree without changing an upper structure and a hull structure. SOLUTION: The hull structure constituted of a main hull partitioned by a wall on the outside of a soup and a deck and the upper structure for receiving air resistance flowing from a bow to a stern on the deck is the hull structure in which a resistance member for controlling air flow is installed on the deck in front of the bow side of the upper structure. The method is one for reducing air resistance generated by the navigation of the ship and is an air resistance reducing method for the hull in which the resistance member for controlling air flow is installed in front of the bow side of the upper structure for receiving air resistance on the deck in the navigation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hull structure for reducing air resistance and a method for reducing air resistance of the hull.

[0002]

2. Description of the Related Art When a ship sails, one receives resistance due to water and waves, and the other receives resistance due to air and wind (air resistance and aerodynamic resistance). Therefore, it is important to design a ship in consideration of the balance between these resistance and power. In terms of ship air resistance,
Both natural winds in the atmosphere and the relative winds generated by navigation create drag on structures above the water surface. In general, when the air resistance is large, problems such as deterioration of fuel consumption (fuel efficiency), reduction of the maximum speed, and deterioration of maneuverability may occur. In particular, when wind is blowing from the side opposite to the traveling direction of the ship, these problems due to an increase in air resistance become significant. And
As a method for reducing these air resistances, the following methods have conventionally been proposed.

That is, air resistance in a ship is generated in a portion above the water surface. Therefore, air resistance caused by a portion of a main hull partitioned by an outer wall and a deck, and air resistance caused by a portion of an upper structure. The dominant air resistance is often the air resistance acting on the superstructure. Therefore, there have been proposed (i) a method of reducing air resistance by changing the shape of the upper structure itself, for example, a streamlined shape, and (ii) a method of providing a movable portion or a detachable portion. However, all of the above methods change the design of the superstructure itself, which is also the living space of the ship's crew. Therefore, there is a problem that a significant change in the design of the ship is required due to the relationship with the living quarters, or the added structure tends to be large-scale, which is disadvantageous in terms of cost and space. In addition, in order to be movable or detachable, a mechanism and a power source for performing such movement and the like are separately required.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present inventors have reduced the load on a device that generates power by suppressing air resistance without changing the upper structure. In order to develop a method and hull structure
We studied diligently. As a result, the present inventors have found that the above problem can be solved by installing a resistance member for controlling the flow of air in front of the upper structure which is a resistor. The present invention has been completed from such a viewpoint.

[0005]

That is, the present invention provides a hull structure comprising a main hull partitioned by an outer wall and a deck, and an upper structure receiving resistance of air flowing from the bow to the stern on the deck. The present invention provides a hull structure, wherein a resistance member for controlling air flow is provided on a deck in front of the upper structure on the bow side. Further, according to the present invention, in a hull structure composed of a similar main hull and an upper structure, a resistance member for controlling the flow of air to the upper structure on the rear side on the stern side is installed in a part of the upper structure. The present invention provides a hull structure characterized by: Further, the present invention is a method for reducing air resistance (aerodynamic drag) generated by the navigation of a ship, and controls the air flow to the forward side of the superstructure receiving the air resistance on the deck during navigation. Another object of the present invention is to provide a method for reducing air resistance of a hull, which comprises installing a resistance member. In addition, the upper structure in this air resistance reduction method includes a part of the upper structure that receives a large amount of air resistance.
It may be provided on the deck or in a part of the superstructure.

As shown in FIG. 5, when there is no resistance member (a), the air flowing from the direction of the bow on the ship directly hits the upper structure 3 and flows upward or sideways in such a way as to obstruct the course. After that, it flows to the rear of the ship on the stern side. Therefore, behind the upper structure 3 with respect to the traveling direction,
A large space (stagnation area) with a small flow of air is generated, and a pulling force is generated rearward for a ship that is going forward, which increases resistance. In contrast, FIG.
When the structure (method) of the present invention is used as shown in (b), the flow of air is controlled by the resistance member 1 before the air collides with the upper structure 3. Accordingly, the amount of air that is obstructed by the upper structure 3 from moving backward is reduced, and the stagnation area generated behind the upper structure 3 is also reduced. Therefore, the backward pulling force on the ship moving forward is also reduced, and as a result, the resistance is reduced.

According to the present invention, it is possible to reduce the load on a device for generating power by suppressing the air resistance to a low level without making a major change to the superstructure of the ship. In the present invention as described above, a resistance member that changes the flow of air is installed in a stage preceding the upper structure that receives a large amount of air resistance. According to the present invention, since the air resistance on the sea surface can be reduced, excellent effects in navigation such as improvement in fuel consumption (fuel efficiency), increase in maximum speed, and improvement in maneuverability are produced. . Hereinafter, the present invention will be described in detail based on illustrated embodiments.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an external view showing an example of a ship employing a hull structure according to the present invention. Since the air resistance in the ship is generated in all the parts above the water surface, the main hull 2 separated by the outer wall and the deck
And the air resistance caused by the upper structure 3. Of these air resistances, the dominant resistance is not the air resistance acting on the main hull 2 but the air resistance acting on the upper structure 3 in many cases. Here, the upper structure 3 is a portion that receives the resistance of the air flowing from the bow to the stern on the deck, and specifically, the main hull 2
Structures such as living quarters and wheelhouses mounted above.

In the present invention, in order to reduce the air resistance of the upper structure 3, the upper structure 3 itself, which is a resistance factor, is not changed at all, and is placed on the deck (A) ahead of the upper structure 3. The resistance member 1 for controlling the flow of air is installed. The resistance member 1 can change and control the flow of air (wind) around the upper structure 3 to reduce the air resistance generated by the upper structure 3. When the upper structure on the deck is composed of two or more components, the resistance member 1 is usually installed in front of the upper structure on the bow side which receives the most air resistance to reduce the flow of air. Control.

The embodiment shown in FIG. 1 will be described as an example of a hull structure. Here, on the deck and in front of the upper structure 3, a triangular prism-shaped resistance member 1 is mounted on the deck with its one rectangular surface facing downward. With respect to the installation location (part A), an optimal location is appropriately selected in consideration of the size of the hull, the size of the superstructure, the shape of the resistance portion of the superstructure, the position of the superstructure on the deck, and the like. For example, when the height of the upper structure 3 from the deck is H, the height of the resistance member 1 from the deck is generally set in the range of 0.1H to 0.5H, and preferably 0.1H to 0.3H. It is. Similarly, when the height of the upper structure 3 from the deck is H, the distance between the upper structure 3 and the resistance member 1 provided in the front is usually determined in the range of 1H to 5H, and 1H to 3H is preferable. It is. The shape of the resistance member 1 is not particularly limited, and in addition to a triangular prism, a polygonal prism as shown in FIG. 2 or a part thereof having a curved surface, a planarly drawn arc, or And a flat plate or a curved plate that is inclined and set up.

The ship to which the hull structure of the present invention is applied is not particularly limited, and includes various ships having any superstructure. For example, in some ships, a wave breaker for preventing a wave from flowing backward on the deck may be installed. However, by installing a resistance member as shown in FIG. The function of the drop plate can also be shared.

In addition, in a ship having a large upper structure as shown in FIG. 4, the resistance member 1 is not applied to the entire upper structure, but is installed only in a part of the upper structure 3 so as to reduce the air resistance. It is also possible. For example, in the case of a cruise ship or the like, since the upper structure 3 is a large-sized structure, the resistance member 1 is usually installed in front of a portion where air resistance is most generated. Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the spirit of the present invention. is there.

[0013]

In the ship using the structure of the present invention, separation of the airflow around the superstructure is suppressed, and the resistance acting on the superstructure is significantly reduced. This reduces the air resistance in the hull without significant design changes.
It can be provided simply and inexpensively. Further, according to the present invention, since the air resistance on the sea surface can be reduced,
Excellent navigational effects, such as improved fuel consumption (fuel efficiency), increased maximum speed, and improved maneuverability, can be obtained. In particular, when the wind is generated from the side opposite to the traveling direction of the ship, the effect due to the decrease in the resistance increases.

[Brief description of the drawings]

FIG. 1 is an external view showing a ship employing an example of a hull structure according to the present invention.

FIG. 2 is a diagram showing an example of a resistance member used in the present invention.

FIG. 3 is an external view showing a boat employing another example of the hull structure according to the present invention.

FIG. 4 is an external view showing a ship employing another example of the hull structure according to the present invention.

5A and 5B are diagrams schematically illustrating a situation in which air resistance occurs in a ship, wherein FIG. 5A illustrates a case of a conventional ship, and FIG. 5B illustrates a case of a ship having the resistance member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resistance member 2 Hull 3 Upper structure

Claims (3)

[Claims] 1. A hull structure comprising: a main hull partitioned by an outer wall and a deck; and an upper structure receiving resistance of air flowing from a bow to a stern on the deck.
A hull structure, wherein a resistance member for controlling air flow is installed on a deck in front of a bow side of the upper structure. 2. A hull structure comprising: a main hull partitioned by an outer wall and a deck; and an upper structure receiving resistance of air flowing from a bow to a stern on the deck.
A hull structure characterized by further comprising a resistance member for controlling air flow to the upper structure on the rear side on the stern side, provided in a part of the upper structure. 3. A method for reducing air resistance caused by navigation of a ship, comprising: installing a resistance member for controlling air flow in front of a bow side of a superstructure receiving air resistance on a deck during navigation. A method for reducing air resistance of a hull.