JP2955076B2 - Hydrofoil ship - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of hydrofoils in the longitudinal direction.
The present invention relates to a hydrofoil ship having :

[0002]

2. Description of the Related Art A wing type of a hydrofoil ship is classified into a water-penetrating type as shown in a perspective view and a front view in FIG. 4 and a perspective view and a front view in FIG. The submersion type is roughly divided into In any of the hydrofoil types, a plurality of wing supports 2A and 2F for supporting the hydrofoil are installed in parallel with the hull center line as shown in the front view and the horizontal sectional view of FIG.

[0003]

Generally, two or more hydrofoils of this type are provided with a plurality of hydrofoils, and the flow of water behind the front wing during the wing running is as shown in FIG. 7 front view and plan view. In addition, the wing vortex 6 generated from the end of the front wing 3F and the pressure drop at the upper part of the front wing surface cause the horizontal flows 7 to be slightly inward from each other. In the rear wing strut placed under such a flow field, since the rear wing strut 2A is installed at an equal distance from the hull center line and parallel to the hull center line, the flow of water to the rear wing strut 2A is inward. Therefore, not only is the water resistance of the rear wing column large, which is disadvantageous, but also there is a problem that an inner lift, that is, a bending moment acts on the rear wing column.

The present invention has been made in view of such circumstances, and has as its object to provide a hydrofoil ship having a hydrofoil with low water resistance.

[0005]

Means for Solving the Problems] The present invention For this purpose, before
For hydrofoils with multiple hydrofoils in the rearward direction,
Of the hydrofoil (hereinafter referred to as the front wing) of the
Parallel and symmetrically side by side, the hull and
Attached to the wing and each of the left and right wing struts
The horizontal section is a symmetrical streamline or airfoil, while
The rear strut of the hydrofoil (rear wing) is located at the centerline of the hull.
It is installed symmetrically side by side with respect to the hull and rear wing.
And each horizontal section of the left and right wing struts
Is a streamlined or airfoil type, and water flowing inward
Open slightly in front of each other in the shape of an octagon so as to follow the flow of
And features.

[0006]

[Function] As described above, the wing support of the foremost wing, as in the past,
Parallel to the hull center line and symmetrically side by side,
And a streamlined or aerofoil of symmetrical, with respect to water flowing approximately parallel towards the Tsubasa支 <br/> pillars from the front, of the wing strut Water resistance
The resistance does not increase. Moreover, the rear wing support,
Slightly alternate in an octagonal shape along the flow of water flowing inward
It is open front, and the flow of water to the rear wing support is smooth
The water resistance of the rear wing support is reduced and the lateral external force is also reduced.
It will be cheap.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a fully submerged hydrofoil will be described with reference to the drawings. FIG. 1 is a rear view showing a rear wing and a rear wing column, and FIG. 2 is a rear wing column of FIG. FIG. 3 is a diagram showing the relationship between the directional angle β of the water flow generated by the front wing and its wing column and the lift coefficient. In the upper drawing, the same reference numerals as those in FIG. 4 denote the same members as those in the drawing. First, in FIG. 1, reference numeral 2 denotes a pair of right and left rear wing columns, and a horizontal sectional view thereof is shown in FIG. In this way, the entire rear wing column is installed at an angle β with respect to the hull center line 5 so as to follow the flow of the water flowing inward, and the rear wing column 2a is outwardly opened forward, that is, in the shape of an octagon. It is. In the case where it is difficult to install the entire rear wing support with its front opening open due to the mounting structure between the rear wing support and the rear wing 3A or the hull 1, the rear wing support 2a 'as shown in FIG. Although the second half is parallel from the middle in the chord length direction, the first half may be installed with the front open. The front opening angles β and β ′ of the cross sections of the rear wing columns 2a and 2a ′ can be determined by the flow angle β of the water flow generated by the front wing and its columns. According to the research of the present inventors, β is shown in FIG. As shown, it varies depending on the boat speed, so it is important to determine β in the range of 0.5 ° to 4.0 ° based on the standard boat speed. By the way, the wing support of the front wing is
As before, it is parallel to the hull center line and symmetrical
And are attached to the hull and hydrofoil
In addition, each horizontal section of the right and left columns is a symmetrical streamline
Shape or airfoil. The present invention is also applicable to a rear wing support of a water-penetrating hydrofoil ship. The present invention can be applied to rear wing posts other than the foremost wing even when more than two wings of the hydrofoil are installed.

[0008]

According to such a hydrofoil ship, regardless of the type of hydrofoil ship of a water penetration type or a fully submerged type, the front wing ship
The wing struts are parallel to the hull center line as before.
Symmetrically arranged and symmetrical streamline or
Is a wing type, and flows almost parallel from the front toward the wing support.
The water resistance of the wing support does not increase
No. Moreover, the water resistance of the rear wing column can be reduced by installing the rear wing column of the hydrofoil ship slightly forward so as to follow the flow of water flowing inward. In particular, when the length of the rear strut chord is long, the effect of the present invention can be greatly exerted. did
As a result, both the front and rear wing struts flow in
It follows the flow of water and reduces the water resistance of the wing support.
Can be

[Brief description of the drawings]

FIG. 1 is a rear view of a hydrofoil ship showing an embodiment in which the present invention is applied to a fully submerged hydrofoil.

FIG. 2 is a horizontal sectional view showing a rear wing column of FIG. 1;

FIG. 3 is a diagram showing a relationship between a directional angle of a water flow generated by a front wing and its support and a lift coefficient;

FIG. 4 is an overall perspective view and a front view showing a known semi-submerged hydrofoil.

FIG. 5 is an overall perspective view and a front view showing a known submerged hydrofoil.

FIG. 6 is a horizontal sectional view showing a rear wing column of the hydrofoil ship shown in FIGS. 4 and 5;

FIG. 7 is a plan view showing a water flow behind a front wing in the hydrofoil ship shown in FIGS. 4 and 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 2a, 2a 'Rear wing column 2F Front wing column 3A Rear wing 3F Front wing 4 Water surface 5 Hull center line 6 Wing tip vortex 7 Water flow behind front wing

Claims (1)

(57) [Claims] 1. A hydrofoil having a plurality of hydrofoils in a longitudinal direction.
Is the front hydrofoil wing column of the ship parallel to the hull centerline?
Symmetrically side by side, on the hull and the front hydrofoil
Mounted, and each horizontal of its left and right wing struts
The cross section is a symmetrical streamline or airfoil, while the rear hydrofoil wing post is at the left of the hull centerline.
Installed on the hull and hydrofoil on the rear side symmetrically side by side
And each horizontal section of the left and right wing struts
Is a streamlined or airfoil type, and water flowing inward
Open slightly in front of each other in the shape of an octagon so as to follow the flow of
A hydrofoil ship characterized by the following.