JPS6157490A - Wind resistance recoverer in ships - Google Patents

Abstract

PURPOSE:To utilize wind resistance positively as well as to improve propulsion capacity ever so better, by installing a rotor in a corner part in front of a structure, where the wind resistance in a ship or the like is produced, while rotating the rotor and generating lift toward a forward direction. CONSTITUTION:On an upper deck 5 of a ship, there are provided with a starboard rotor 1 and a port side rotro 2, and an upper rotor 3 is installed in the upper front of a sperstruacure 4. Now, if the ship goes forward in a 8 direction, the ship receives wind pressure in a 9 direction. At this time each of rotors 1-3 rotates in the specified direction each, whereby lift is produced in a direction being orthogonal with an air stream owing to a Magnus effect. And, since this lift has a propulsion directional component of the ship, this propulsion directional component is utilized and ship's propulsion capacity is improved. With this constitution, the wind resistance is positively utilized, thus the propulsion capacity is improvable.

Description

[Detailed Description of the Invention] (Related Industrial Field) With the trend toward energy conservation, ships are shifting to lower power output of main engines and lower ship speeds. For this reason, the influence of wind pressure resistance on the propulsion performance and seakeeping performance of ships tends to gradually increase.

The present invention relates to a technique for recovering wind pressure resistance generated in structures on the upper deck of a ship and utilizing this to improve propulsion performance and seaworthiness.

(Conventional technology) As shown in "New Technologies and the Future of Shipping Shipbuilding in Countries Around the World" published by Japan Marine Engineers Association on July 1, 1980, wind pressure resistance was conventionally reduced by making the superstructure smaller and more streamlined. Although there are technologies that attempt to reduce wind resistance, there is no technology that actively attempts to recover wind resistance. In addition, reducing wind pressure resistance through miniaturization is accompanied by restrictions on placement and cannot be applied to all cases.

(Problems to be Solved by the Invention) The problems of the prior art described above are overcome, and the wind resistance exerted by structures on the upper deck of a ship is actively used to improve propulsion performance and seaworthiness. It lies in trying to make it work.

(Means for solving the problem) One or more rotors are installed near the left, right, and upper corners of the front of a structure that generates wind pressure resistance, such as a ship, and the rotors are rotated to generate lift in the forward direction by the Magnus effect. This feature is characterized in that it is made to occur.

(Example) The present invention will be explained in detail below with reference to the drawings. Figure 1 is a side view of the upper part of the ship, Figure 2 is a plan view, and Figure 3 is a top view of the ship.
The figure also shows a front view. 1 is the starboard rotor and 2 is the port rotor, which are installed upright on the upper deck S. Reference numeral 3 denotes an upper rotor, which is installed horizontally on the upper front surface of the upper structure 4. 6 is the outer shell of the ship. 7 is the sea level and the ship is moving in the direction of arrow 8 and is subjected to wind pressure in the direction of arrow 9. In FIG. 2, the starboard rotor 1 is rotated clockwise, the port rotor 2 is rotated counterclockwise, and the upper rotor 3 is rotated counterclockwise in FIG.

(Function) When the cylinder 1o is inserted vertically into a uniform flow and rotated, a pressure difference is created between the top and bottom of the cylinder as shown in FIG. 6, and lift is generated due to the Magnus effect. Let the air density be ρ(k(Hse
c"/m'), the radius of the cylinder is r (m), the angular velocity of one rotation is CIJ (rad/5ecL, the uniform flow velocity is U (m/5
ec), the lift force per unit length of one cylinder is expressed by the following formula.

L= 2-rc p U r” +11 (kg/
m) This lifting force is caused by a uniform flow velocity U from left to right in the horizontal direction as shown in Figure 6, and when the cylinder rotates clockwise,
Work upward.

When a ship receives wind from the front in the direction of travel while sailing, an air flow 11 as shown in FIGS. 4 and 5 occurs. That is, the air hitting the upper structure 4 is divided into left and right sides in a plan view (FIG. 5).

In the stacking direction, the airflow blows upward from the bottom.

I mean, the top too! Air flows from the center to the side at both ends of the front surface of the gift 4, and from bottom to top at the upper part of the front surface of the upper structure 4.

When the rotors 1 to 3 shown in Figs. 1 to 3 are rotated in the directions mentioned above, lift is generated in a direction perpendicular to the airflow due to the Magnus effect explained in Fig. 6, but this lift is It naturally has a component in the propulsion direction of the ship.6 (Effect of the invention) As described above, rotors are installed upright on the left and right sides of the structure on the upper deck, further rotors are installed horizontally on the upper part, and these rotors are rotated. By doing so, part or most of the wind pressure resistance generated on the structure can be recovered as lifting force.

The lift force generated by the port rotor and starboard rotor has a certain angle to the ship's propulsion direction, and the propulsion direction component of this lift force can be used to improve the ship's propulsion performance and seaworthiness.

[Brief explanation of drawings]

Figure 1 is a side view of the ship. Figure 2 is also a plan view. Figure 3 is also a front view. Figures 4 and 5 are streamline diagrams of the wind around structures on the upper deck of the ship. FIG. 6 is an explanatory diagram of the Magnus effect. In the diagram; 1 starboard rotor 2 port rotor 3 upper rotor 4 upper structure 5 upper deck 6 ship side shell 7 sea surface 8 ship speed V 1 (m/5ec)
9 Wind speed V,? (m/5ec) 10 Cylinder 11
Flow velocity around the structure Figure 1 Figure 3

Claims (1)

[Claims] This device is equipped with one or more rotors near the left, right, and upper corners of the front of a structure that generates wind resistance, such as a ship, and rotates the rotor to generate lift in the forward direction using the Magnus effect. A wind pressure resistance recovery device for ships, etc., characterized by: