JP2012224111A - Frictional resistance reduction type ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frictional resistance reduction type ship capable of efficiently reducing frictional resistance while suppressing energy consumption when supplying air to gas blow-out units at a plurality of positions with different water depths from the draft line of a still water surface.SOLUTION: The frictional resistance reduction type ship 1 includes a plurality of gas blow-out units 41, 51 and a plurality of gas supply devices 60, 70. The plurality of gas blow-out units 41, 51 are formed at a plurality of positions with different water depths from the draft line DL of the still water surface in the ship 1, and capable of blowing out gas. The plurality of gas supply devices 60, 70 are provided corresponding to the plurality of gas blow-out units 41, 51, and supply gas to the plurality of gas blow-out units 41, 51.

Description

  The present invention relates to a ship, and more particularly to a frictional resistance reduced ship.

  As a technique for reducing the resistance acting on the hull of a ship, a method is known in which air (bubbles) is blown out from the ship bottom or the ship side, and the entire ship bottom is covered with bubbles. A ship using such a technique is also called a ship with reduced frictional resistance. In the ship having reduced frictional resistance, an air blowing portion for blowing out air is provided on the ship bottom or the ship side. In order to blow out air from the air blowing portion, it is necessary to use air compressed by a blower or a compressor. This is because the air needs to have a pressure corresponding to the water pressure at the ship bottom or on the ship side.

  As a related technique, Japanese Patent Laying-Open No. 2010-120612 (Patent Document 1) discloses a hull frictional resistance reduction device. The hull frictional resistance reduction device includes a plurality of air outlets, air supply means, air supply amount adjustment means, water pressure detection estimation means, and control means. The plurality of air outlets are provided along the width direction on the bottom surface of the hull. The air supply means supplies air to the plurality of air outlets. The air supply amount adjusting means adjusts the air supply amount to the plurality of air outlets by the air supply means. The water pressure detection estimating means detects or estimates the water pressure at the plurality of air outlets. The control means controls the air supply amount adjustment means based on the detection estimation result of the water pressure detection estimation means so that the air blowing flow rates at the plurality of air blowing openings are constant.

  In the technique of this Patent Document 1, in view of the fact that the water pressures at the plurality of air outlets in the width direction of the ship bottom differ from each other due to the inclination of the hull, the flow rate is set so that the air blowing flow rate at the plurality of air outlets is constant. The air supply amount is adjusted using an adjustment valve (air supply amount adjusting means). Thereby, the distribution of the air flowing along the outer surface of the ship bottom is made uniform in the width direction regardless of the navigation state of the ship.

JP 2010-120612 A

However, the following facts became clear for the first time this time by recent research by the inventors.
In the technique of Patent Document 1 described above, all of the plurality of air outlets are provided on the ship bottom. That is, the water depth from the water line when floating on the still water surface is the same at the plurality of air outlets. Therefore, the difference in water pressure between the air outlets due to the inclination of the hull is not so great. Therefore, it is considered that there is not so much energy loss caused by adjusting the flow rate (pressure) by each flow rate adjusting valve (air supply amount adjusting means). As a result, even if air is distributed from a single blower (air supply means) to a plurality of air outlets, energy by flow rate adjustment (or pressure adjustment) by a plurality of flow rate adjustment valves (multiple air supply amount adjustment means) The loss of is considered not to be so great.

  Here, let us consider a case where a part of the plurality of air outlets is provided on the ship side and the other is provided on the ship bottom. In this case, the water depth from the water line when floating on the still water surface is greatly different between the ship side air outlet and the ship bottom air outlet. Therefore, regardless of the inclination of the hull, the water pressure differs greatly between the ship side air outlet and the ship bottom air outlet. As a result, when air is distributed from one blower (air supply means) to the air outlet on the ship side and the air outlet on the bottom of the ship, if no adjustment is made, the air will be easily discharged from the air outlet on the ship side. It is thought that air is difficult to blow out from the air outlet. In order to avoid this state, if the flow adjustment valve for the air outlet on the ship side is adjusted so that it is difficult for the air to blow out from the air outlet on the ship side, it is considered that the energy loss due to the flow adjustment increases. Since the pressure of the supplied air is set according to the deep water depth (high water pressure) at the bottom of the ship, the pipe flow resistance is increased by the flow adjustment valve on the ship side at low water depth (low water pressure), and the air pressure is lowered. Because.

  An object of the present invention is to efficiently carry out energy saving when supplying air to each gas blowing portion in a ship provided with gas blowing portions at a plurality of positions having different water depths from the waterline of the still water surface. The object is to provide a ship with reduced frictional resistance. Further, in a ship in which gas blowing portions are provided at a plurality of positions having different water depths from the waterline of the still water surface, a frictional resistance reduction ship capable of sending gas in a balanced manner from each gas blowing portion is provided. It is in. In a ship where gas blowing parts are provided at a plurality of positions at different water depths from the waterline of the still water surface, each gas blowing part suppresses energy consumption even if the hull tilts and the water depths from the sea surface differ. An object of the present invention is to provide a ship with reduced frictional resistance capable of delivering gas in a balanced manner.

  These objects and other objects and benefits of the present invention can be easily confirmed by the following description and the accompanying drawings.

  Hereinafter, means for solving the problem will be described using the numbers and symbols used in the embodiments for carrying out the invention. These numbers and symbols are added with parentheses in order to clarify the correspondence between the description of the claims and the mode for carrying out the invention. However, these numbers and symbols should not be used for interpreting the technical scope of the invention described in the claims.

  The ship with reduced frictional resistance according to the present invention includes a plurality of gas blowing portions (41, 51) and a plurality of gas supply devices (60, 70). The plurality of gas blowing portions (41, 51) are provided at a plurality of positions having different water depths from the draft line of the still water surface in the ship (1), and can blow out the gas. The plurality of gas supply devices (60, 70) are provided corresponding to the plurality of gas blowing sections (41, 51), and supply gas to the plurality of gas blowing sections (41, 51).

  In the ship with reduced frictional resistance, the plurality of gas blowing portions (41, 51) include a ship bottom gas blowing portion (41), a starboard gas blowing portion (51a), and a portside gas blowing portion (51b). Is preferred. The ship bottom gas blowing part (41) is provided on the ship bottom (5) of the ship (1) and is capable of blowing gas. The starboard gas blowing part (51a) and the portside gas blowing part (51b) are provided on the ship sides (4a, 4b) of both sides of the ship (1) at a position where the water depth is different from that of the ship bottom gas blowing part (41). Gas can be blown out. The plurality of gas supply devices (60, 70) preferably include a ship bottom gas supply device (60) and a ship side gas supply device (70). The ship bottom gas supply device (60) supplies gas to the ship bottom gas blowing section (41) via the ship bottom gas flow path (43). The ship-side gas supply device (70) includes ship-side gas flow paths (53 / 53a and 53b / 53) different from the ship-bottom gas flow path (43) in the starboard gas blow-out section (51a) and the port-side gas blow-out section (51b). The gas is supplied through the ship bottom gas supply device (60).

  In the above-described ship for reducing frictional resistance, the ship-side gas supply device (70) includes a ship-side gas delivery unit (55), a starboard gas flow rate adjustment unit (54a), a starboard supply unit (52a), and a portside gas flow rate adjustment unit ( 54b) and a port supply part (52b). A ship side gas delivery part (55) sends out gas. The starboard gas flow rate adjusting unit (54a) adjusts the gas flow rate to the starboard side among the gases sent from the ship side gas sending unit (55). The starboard supply unit (52a) supplies the gas adjusted from the starboard gas flow rate adjusting unit (54a) to the starboard gas blowing unit (51a). The port gas flow rate adjusting unit (54b) adjusts the gas flow rate to the port side of the gas sent from the ship side gas sending unit (55). The port supply unit (52b) supplies the gas adjusted by the port gas flow rate adjustment unit (54b) to the port gas blowing unit (51b).

  In the ship with reduced frictional resistance, the bottom gas supply device (60) preferably includes a bottom gas delivery unit (45), a bottom gas flow rate adjustment unit (44), and a bottom supply unit (42). . The ship bottom gas delivery part (45) delivers gas and is different from the ship side gas delivery part (55). The ship bottom gas flow rate adjusting unit (44) adjusts the flow rate of the gas sent from the ship bottom gas sending unit (45). The ship bottom supply unit (42) supplies the gas adjusted by the ship bottom gas flow rate adjustment unit (44) to the ship bottom gas blowing unit (41).

  In the above-described ship for reducing frictional resistance, the ship-side gas supply device (70) includes a starboard gas delivery unit (55a), a starboard gas flow rate adjustment unit (54a), a starboard supply unit (52a), and a portside gas delivery unit (55b). ), A port gas flow rate adjustment unit (54b), and a port supply unit (52b). The starboard gas delivery part (55a) delivers gas. The starboard gas flow rate adjusting unit (54a) adjusts the flow rate of the gas sent from the starboard gas sending unit (55a). The starboard supply unit (52a) supplies the gas adjusted by the starboard gas flow rate adjusting unit (54a) to the starboard gas blowing unit (51a). The port gas delivery section (55b) delivers gas. The port gas flow rate adjusting unit (54b) adjusts the flow rate of the gas sent from the port gas sending unit (55b). The port supply unit (52b) supplies the gas adjusted by the port gas flow rate adjustment unit (54b) to the port gas blowing unit (51b).

  In the ship with reduced frictional resistance, the bottom gas supply device (60) preferably includes a bottom gas delivery unit (45), a bottom gas flow rate adjustment unit (44), and a bottom supply unit (42). . The ship bottom gas delivery part (45) delivers gas and is different from the ship side gas delivery part (55). The ship bottom gas flow rate adjusting unit (44) adjusts the flow rate of the gas sent from the ship bottom gas sending unit (45). The ship bottom supply unit (42) supplies the gas adjusted by the ship bottom gas flow rate adjustment unit (44) to the ship bottom gas blowing unit (41).

  In the ship with reduced frictional resistance, the bottom gas supply device (60) preferably includes a bottom gas delivery unit (45), a bottom gas flow rate adjustment unit (44), and a bottom supply unit (42). . The ship bottom gas delivery unit (45) delivers gas. The ship bottom gas flow rate adjusting unit (44) adjusts the flow rate of the gas sent from the ship bottom gas sending unit (45). The ship bottom supply unit (42) supplies the gas adjusted by the ship bottom gas flow rate adjustment unit (44) to the ship bottom gas blowing unit (41). The ship-side gas supply device (70) includes a pressure adjustment unit (58), a starboard gas flow rate adjustment unit (54a), a starboard supply unit (52a), a portside gas flow rate adjustment unit (54b), and a portside supply unit (52b). ). The pressure adjusting unit (58) regulates and sends the gas sent from the ship bottom gas sending unit (45). The starboard gas flow rate adjustment unit (54a) adjusts the gas flow rate to the starboard side of the gas sent from the pressure adjustment unit (58). The starboard supply unit (52a) supplies the gas adjusted by the starboard gas flow rate adjusting unit (54a) to the starboard gas blowing unit (51a). The port gas flow rate adjustment unit (54b) adjusts the gas flow rate to the port side of the gas sent from the pressure adjustment unit (61). The left supply unit (52b) supplies the gas adjusted by the port gas flow rate adjustment unit (54b) to the port gas blowing unit (51b).

  In the ship with reduced frictional resistance, the ship bottom gas supply device (60) preferably further includes a first tank (47) for storing the gas sent from the ship bottom gas sending part (45). It is preferable that the gas stored in the first tank (47) is supplied to the ship bottom gas flow rate adjusting unit (44) and the pressure adjusting unit (58). It is preferable that the ship side gas supply apparatus (70) is further provided with the 2nd tank (57) which stores the gas sent out from the pressure adjustment part (58). It is preferable that the gas stored in the second tank (57) is supplied to the starboard gas flow rate adjusting unit (54a) and the port gas flow rate adjusting unit (54b).

  According to the present invention, when supplying air to each gas blowing portion in a ship where gas blowing portions are provided at a plurality of positions having different water depths from the waterline of the still water surface, energy consumption can be reduced and efficiently implemented. Become. Further, in a ship provided with gas blowing portions at a plurality of positions having different water depths from the draft line on the still water surface, it becomes possible to send out gas from each gas blowing portion in a balanced manner. In a ship where gas blowing parts are provided at a plurality of positions at different water depths from the waterline of the still water surface, each gas blowing part suppresses energy consumption even if the hull tilts and the water depths from the sea surface differ. It is possible to deliver gas in a well-balanced manner.

FIG. 1A is a schematic side view showing an example of the configuration of a frictional resistance reduction ship according to the first embodiment of the present invention. FIG. 1B is a schematic bottom view showing an example of the configuration of the frictional resistance reduction ship according to the first embodiment of the present invention. FIG. 2 is a schematic diagram showing details of the configuration of the gas blowing device according to the first embodiment of the present invention. FIG. 3 is a schematic diagram showing the tilt angle θ of rolling. FIG. 4 is a schematic diagram showing details of the configuration of the gas blowing device according to the second embodiment of the present invention. FIG. 5 is a schematic side view showing an example of the configuration of a frictional resistance reduction ship according to the third embodiment of the present invention. FIG. 6 is a schematic diagram showing details of the configuration of the gas blowing device according to the third embodiment of the present invention.

  Hereinafter, a frictional resistance reduction type ship according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
A configuration of the frictional resistance reduction type ship according to the first embodiment of the present invention will be described.
1A and 1B are a schematic side view and a schematic bottom view showing an example of a configuration of a frictional resistance reduction type ship according to the first embodiment of the present invention. In this figure, the ship length direction (front-rear direction), the ship width direction (left-right direction) of the hull 20 of the frictional resistance reduction type ship 1, and the directions perpendicular to them are shown as the x direction, the y direction, and the z direction, respectively. ing. A line in contact with the water surface of the hull 20 floating on the still water surface is defined as a draft line DL. The center line of the hull 20 in the length direction (x direction) is defined as a hull center line C.

  The frictional resistance reduction type ship 1 includes a hull 20 and a gas blowing device 30. The hull 20 includes a bow portion 2 including a tip portion 6, an intermediate portion 8, a stern portion 3, a propeller 21, and a rudder 22. Here, the hull 20 is divided into approximately three equal parts in the direction of the hull center line C, the bow side portion is the bow portion 2, the stern side portion is the stern portion 3, and the portion in between is the intermediate portion 8. The propeller 21 and the rudder 22 are provided in the stern part 3 on the hull center line C. The gas blowing device 30 is provided inside the hull 20.

  The gas blowing device 30 is configured to gas from the gas blowing portion provided on the ship side 4 and the ship bottom 5 of the bow 2 into the water so that the ship bottom 5 and the ship side 4 of the hull 20 are covered with bubbles during navigation (eg, air, main engine). Etc.). The gas blowing device 30 includes a plurality of gas supply devices. The plurality of gas supply devices are provided corresponding to a plurality of gas blowing portions provided at a plurality of positions at different water depths from the draft line DL of the hydrostatic surface in the hull outer plate 10, and gas is supplied to the plurality of gas blowing portions. Supply. In the present embodiment, the gas blowing device 30 includes a ship side gas supply device 70 and a ship bottom gas supply device 60. The ship side gas supply device 70 is provided corresponding to the ship side gas blowing part 51 provided on the ship side 4. The ship bottom gas supply device 60 is provided corresponding to the ship bottom gas blowing part 41 provided on the ship bottom 5. The ship side gas blowing part 51 and the ship bottom gas blowing part 41 are provided at positions where the water depths from the water line DL are different from each other, and the difference in water depth is H0. The gas blowing device 30 further includes a control device 59 that controls the ship side gas supply device 70 and the ship bottom gas supply device 60. The control device 59 is provided, for example, in a control room (or a steering room) of the frictional resistance reduction type ship 1.

  The ship side gas blowing section 51 is provided on the hull outer plate 10 of the ship side 4 of both sides in the bow section 2 and can blow out gas into the water. The starboard gas blowing section 51a provided on the starboard side 4a can blow gas into the water on the starboard side 4a. The port gas blowing part 51b provided on the port side 4b can blow gas into the water on the port side 4b. If ship side gas blowing-out part 51 is provided in ship side 4, there will be no restriction in particular. For example, one or a plurality of slits, circles, ellipses, oval holes, etc., through which gas can be blown out may be provided. The ship side gas supply device 70 includes a ship side gas delivery part 55, a ship side gas flow path 53, and a ship side gas supply part 52. The ship side gas delivery part 55 compresses and sends out gas. The ship-side gas flow channel 53 is a pipe that supplies the gas from the ship-side gas delivery unit 55 to the ship-side gas supply unit 52. The ship-side gas supply unit 52 is a gas supply chamber provided on the ship-side gas blowing unit 51. The gas supply chamber is provided for each of one or a plurality of holes. The gas supplied through the ship-side gas flow channel 53 is blown out from the ship-side gas blowing part 51 into the water.

  The ship bottom gas blowing part 41 is provided on the hull outer plate 10 of the ship bottom 5 in the bow part 2 and can blow gas into the water. If the ship bottom gas blowing part 41 is provided in the ship bottom 5, there will be no restriction | limiting in particular. For example, one or a plurality of slits, circles, ellipses, oval holes, etc., through which gas can be blown out may be provided. The ship bottom gas supply device 60 includes a ship bottom gas delivery part 45, a ship bottom gas flow path 43, and a ship bottom gas supply part 42. The ship bottom gas delivery unit 45 compresses and delivers the gas. The ship bottom gas channel 43 is a pipe that supplies the gas from the ship bottom gas delivery unit 45 to the ship bottom gas supply unit 42. The ship bottom gas supply unit 42 is a gas supply chamber provided on the ship bottom gas blowing unit 41. The gas supply chamber is provided for each of one or a plurality of holes. The gas supplied through the ship bottom gas flow path 43 is blown out into the water from the ship bottom gas blowing portion 41.

FIG. 2 is a schematic diagram showing details of the configuration of the gas blowing device 30.
The ship-side gas supply device 70 includes a ship-side gas delivery unit 55, a flow meter 56, a starboard gas flow rate adjustment unit 54 a, a portside gas flow rate adjustment unit 54 b, and a starboard supply unit 52 a and a starboard supply unit as the shipside gas supply unit 52. 52b and a ship-side gas flow path 53 are provided. The gas blowing device 30 may further include an inclination sensor 80.

  The ship side gas delivery unit 55 is exemplified by a compressor, a blower, or a fan, and compresses and delivers the gas. It is controlled by the ship side control unit 59S of the control device 59. The ship-side gas flow channel 53 is a pipe connected to the ship-side gas delivery unit 55, the starboard gas supply unit 52a, and the portside gas supply unit 52b. The gas from the ship side gas delivery part 55 is supplied to the starboard gas supply part 52a and the portside gas supply part 52b. The ship-side gas flow channel 53 is branched into a starboard gas supply unit 52a and a portside gas supply unit 52b at a midway node N1. The flow meter 56 is provided in the middle of the ship-side gas flow channel 53. The flow rate of the gas flowing through the ship side gas passage 53 is measured and output to the ship side control unit 59S. The starboard gas flow rate adjusting portion 54a is provided in the middle of the ship side gas flow channel 53 branched to the starboard side. The gas flow rate to the starboard side among the gases sent from the ship side gas delivery unit 55 is adjusted. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship side control unit 59S of the control device 59. The starboard supply unit 52a is a gas supply chamber provided on the starboard gas blowing unit 51a. The gas adjusted by the starboard gas flow rate adjusting unit 54a is supplied to the starboard gas blowing unit 51a and blown out from there. The port side gas flow rate adjusting part 54b is provided in the middle of the ship side gas flow channel 53 branched to the port side. The gas flow rate to the port side of the gas sent from the ship side gas delivery unit 55 is adjusted. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship side control unit 59S of the control device 59. The port supply unit 52b is a gas supply chamber provided on the port gas blowing unit 51b. The gas adjusted by the port gas flow rate adjusting unit 54b is supplied to the port gas blowing unit 51b and blown out from there.

  The ship bottom gas supply device 60 includes a ship bottom gas delivery part 45, a flow meter 46, a ship bottom gas flow rate adjustment part 44, a ship bottom supply part 42, and a ship bottom gas flow path 43.

  The ship bottom gas delivery unit 45 is exemplified by a compressor, a blower, or a fan, and delivers gas. Unlike the ship side gas delivery part 55, it is provided separately. It is controlled by the ship bottom controller 59B of the control device 59. The ship bottom gas channel 43 is a pipe connected to the ship bottom gas delivery part 45 and the ship bottom gas supply part 42. The gas from the ship bottom gas delivery unit 45 is supplied to the ship bottom gas supply unit 42. The flow meter 46 is provided in the middle of the ship bottom gas flow path 43. The flow rate of the gas flowing through the ship bottom gas channel 43 is measured and output to the ship bottom control unit 59B. The ship bottom gas flow rate adjusting unit 44 is provided in the middle of the ship bottom gas flow path 43. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship bottom controller 59B of the control device 59. The flow rate of the gas sent from the ship bottom gas sending part 45 is adjusted. The ship bottom supply unit 42 is a gas supply chamber provided on the ship bottom gas blowing unit 41. The gas adjusted by the ship bottom gas flow rate adjusting unit 44 is supplied to the ship bottom gas blowing unit 41 and blown out into the water therefrom.

  The ship bottom gas supply device 60 supplies gas at a relatively high pressure in order to supply gas to the ship bottom gas blowing part 41 at a relatively deep water depth. On the other hand, since the ship-side gas supply device 70 supplies gas to the ship-side gas blowing part 51 (starboard gas blowing part 51a and portside gas blowing part 51b) at a relatively shallow depth, the gas is supplied at a relatively low pressure. Supply. At this time, since the difference in water depth between the ship bottom gas blowing portion 41 and the ship side gas blowing portion 51 is H0, for example, the ship bottom gas supply device 60 and the ship side gas are set so as to have a pressure difference corresponding to the difference in water depth H0. It is preferable to control the pressure of the gas in the supply device 70.

  The tilt sensor 80 detects the rolling tilt angle θ of the hull 20. For example, the rolling inclination angle θ of the hull 20 with respect to the vertical direction is detected. As shown in FIG. 3, the rolling inclination angle θ is defined to be positive when the hull 20 rolls so that the port side 4b is lowered. The detected rolling inclination angle θ is output to the control device 59.

  As described above, the control device 59 includes the ship side control unit 59S and the ship bottom control unit 59B. The ship-side control unit 59S is configured to supply a desired gas flow rate to the starboard gas blowing unit 51a and the portside gas blowing unit 51b based on the navigation conditions and sea conditions, and the starboard gas flow rate adjusting unit 54a. And the port gas flow rate adjusting unit 54b. Similarly, the ship bottom control unit 59B controls the ship bottom gas delivery unit 45 and the ship bottom gas flow rate adjustment unit 44 so as to supply a desired gas flow rate to the ship bottom gas blowing unit 41 based on navigation conditions and sea conditions. To do. The ship side control unit 59S and the ship bottom control unit 59B may perform control in cooperation with each other, or may perform control independently of each other.

  For example, the ship-side control unit 59S is set in advance based on the navigation speed v (speedometer of the ship 1), the rolling inclination angle θ (inclination sensor 80), and the wave height h (input of the observation equipment and crew of the ship 1). The motor rotation speed of the ship side gas delivery unit 55 or starboard gas so that the gas flow rate corresponding to the value of (v, θ, h) in the table or function is supplied to the starboard gas blowing unit 51a and the portside gas blowing unit 51b. The opening degree of the valve of the flow rate adjusting unit 54a and the opening degree of the valve of the port gas flow rate adjusting unit 54b are controlled. The ship-side control unit 59S performs feedback control using the gas flow rate value of the flow meter 56. Similarly, the ship bottom control unit 59B generates a gas flow rate corresponding to the value of (v, θ, h) in a predetermined table or function based on the navigation speed v, the rolling inclination angle θ, and the wave height h, and the ship bottom gas blowing unit 41. The motor rotation speed of the ship bottom gas delivery part 45 and the opening degree of the valve of the ship bottom gas flow rate adjustment part 44 are controlled so as to be supplied to the engine. The ship bottom control unit 59B performs feedback control using the gas flow rate value of the flow meter 46.

  As the control, the amount of gas supply (gas flow rate) is increased as the navigation speed v of the frictional resistance reduced ship 1 is increased, and the gas is blown out from the starboard gas blowing portion 51a, the portside gas blowing portion 51b, and the bottom gas blowing portion 41. It is preferable to increase the generated bubbles. Further, when the frictional resistance-reducing ship 1 is tilted by rolling, the water pressure at the gas blowing part on the ship side at the lower side of the inclination becomes relatively high, and the water pressure at the gas blowing part on the ship side at the upper side of the inclination is relatively high. Lower. As a result, the amount of gas sent out from the starboard gas blowing section 51a and the amount of bubbles sent out from the port gas blowing section 51b become unbalanced. Therefore, in order to prevent this, the gas flow rate adjustment part connected to the gas blowing part on the ship side on the lower side of the inclination is relatively opened to increase the gas supply amount, or the gas connected to the gas blowing part on the ship side on the upper side of the inclination. It is preferable to relatively close the flow rate adjusting unit to reduce the gas supply amount or both.

The frictional resistance reduction ship 1 operates as follows, for example.
During the operation of the ship 1 with reduced frictional resistance, the ship-side control unit 59S corresponds to the values (v, θ, h) from a preset table based on the navigation speed v, the rolling inclination angle θ, and the wave height h. The gas flow rate for the starboard gas blowing part 51a and the port gas blowing part 51b is extracted. And the motor rotation speed of the ship side gas delivery part 55 and the starboard gas flow rate adjustment part 54a are supplied so that the ship side gas supply apparatus 70 supplies the gas of the gas flow rate extracted to the starboard gas blowing part 51a and the port gas blowing part 51b. And the opening degree of the valve of the port gas flow rate adjusting unit 54b is controlled. At that time, the ship-side control unit 59S acquires the measured value of the gas flow rate from the flow meter 56 as a feedback signal, and performs feedback control. For example, the flow rate of the flow meter 56 is controlled to be a predetermined flow rate, and the table corresponding to the predetermined flow rate is used. Similarly, the ship bottom control unit 59B determines the gas flow rate for the ship bottom gas blowing unit 41 corresponding to the values of (v, θ, h) from a predetermined table based on the navigation speed v, the rolling inclination angle θ, and the wave height h. Extract. Then, the motor rotational speed of the ship bottom gas delivery unit 45 and the opening degree of the valve of the ship bottom gas flow rate adjusting unit 44 are set so that the ship bottom gas supply device 60 supplies the gas with the gas flow rate extracted to the ship bottom gas blowing unit 41. Control. At that time, the ship bottom control unit 59B acquires the measured value of the gas flow rate from the flow meter 46 as a feedback signal, and performs feedback control. For example, the flow rate of the flow meter 46 is controlled to be a predetermined flow rate, and the table corresponding to the predetermined flow rate is used as the table. Thereby, the amount of gas sent out from the starboard gas blowing section 51a and the amount of bubbles sent out from the portside gas blowing section 51b are balanced, and the amount of bubbles sent out from the ship bottom gas blowing section 41 is also changed to starboard gas blowing. It is controlled to an appropriate value in relation to the amount of bubbles from the part 51a and the port gas blowing part 51b.

  Bubbles formed by the gas blown into the water from the ship-side gas blowing part 51 and the ship-bottom gas blowing part 41 flow so as to cover the ship-side 4 and the ship bottom 5, and the frictional resistance is reduced. At this time, in this Embodiment, with respect to the ship side gas blowing part 51 and the ship bottom gas blowing part 41 which were provided in the position where the water depth (namely, water pressure) from a water line differs, different ship side gas supply apparatuses 70 and ship bottom gas supply apparatuses are provided. 60 is used to supply gas. In this way, by providing different gas supply devices for the gas blowing parts with different water depths (water pressures), one gas sending part (compressor, blower, etc.) supplies gas to the gas blowing parts that are not so different in water pressure. can do. Thereby, it is not necessary to adjust the pressure due to the pressure loss in the gas flow rate adjustment unit, and the energy consumption of the gas delivery unit is suppressed, and efficient gas blowing is enabled.

  Moreover, as the ship side gas blowing part 51 (starboard gas blowing part 51a and portside gas blowing part 51b), it can respond with one gas delivery part, and can suppress manufacturing cost low.

  In addition, it is preferable that the width | variety d judged that the water depth (water pressure) at the time of providing a different gas supply apparatus differs is small from a viewpoint of suppressing the energy consumption of a gas delivery part. However, it is preferable that the gas supply device is large in view of the installation cost of the gas supply device and the influence on the hull 20 accompanying the installation. Considering both, it is considered that at least the gas blowing unit on the ship side and the gas blowing unit on the bottom of the ship are preferably provided with different gas supply devices due to the difference in water depth (water pressure) between the two. Further, for example, assuming that the expected maximum rolling inclination angle is θmax and the maximum width of the frictional resistance reduced ship 1 is Wmax, it is considered that d = Wmax · sin θmax is a preferable range. Each flow path may be provided with other valves (eg, shut-off valve, relief valve) to ensure the reliability and safety of the operation.

(Second Embodiment)
A configuration of the frictional resistance reduction type ship according to the second embodiment of the present invention will be described.
In the present embodiment, in the ship-side gas supply device 70, the ship-side gas delivery part 55, the flow meter 56, and the ship-side gas flow path 53 are provided separately on the starboard side and the port side. This is different from the case of the embodiment. In the following, differences from the first embodiment will be mainly described.

FIG. 4 is a schematic diagram showing details of the configuration of the gas blowing device 30.
The ship-side gas supply device 70 includes a starboard starboard gas supply device 70a and a portside port gas supply device 70b. The starboard gas supply device 70a includes a starboard side starboard gas delivery section 55a, a flow meter 56a, a starboard gas flow rate adjustment section 54a, a starboard gas flow path 53a, and a starboard supply section 52a. The port gas supply device 70b includes a port side gas delivery unit 55b, a flow meter 56b, a port gas flow rate adjustment unit 54b, a port gas channel 53b, and a starboard supply unit 52b.

  The starboard gas supply device 70a will be described. The starboard gas delivery unit 55a is exemplified by a compressor, a blower or a fan, and compresses and delivers the gas. It is controlled by the ship side control unit 59S of the control device 59. The starboard gas passage 53a is a pipe connected to the starboard gas delivery part 55a and the starboard gas supply part 52a. The gas from the starboard gas delivery unit 55a is supplied to the starboard gas supply unit 52a. The flow meter 56a is provided in the middle of the starboard gas passage 53a. The flow rate of the gas flowing through the starboard gas passage 53a is measured and output to the ship-side control unit 59S. The starboard gas flow rate adjusting unit 54a is provided in the middle of the starboard gas flow path 53a. The flow rate of the gas delivered from the starboard gas delivery part 55a is adjusted. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship side control unit 59S of the control device 59. The starboard supply unit 52a is a gas supply chamber provided on the starboard gas blowing unit 51a. The gas adjusted by the starboard gas flow rate adjusting unit 54a is supplied to the starboard gas blowing unit 51a and blown out from there.

  The port gas supply device 70b will be described. The port gas delivery unit 55b is exemplified by a compressor, a blower, or a fan, and compresses and delivers the gas. It is controlled by the ship side control unit 59S of the control device 59. The port gas channel 53b is a pipe connected to the port gas delivery unit 55b and the port gas supply unit 52b. The gas from the port gas delivery unit 55b is supplied to the port gas supply unit 52b. The flow meter 56b is provided in the middle of the port side gas passage 53b. The flow rate of the gas flowing through the port gas flow path 53b is measured and output to the ship side control unit 59S. The port gas flow rate adjusting unit 54b is provided in the middle of the port gas flow channel 53b. The flow rate of the gas sent from the port gas sending part 55b is adjusted. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship side control unit 59S of the control device 59. The port supply unit 52b is a gas supply chamber provided on the port gas blowing unit 51b. The gas adjusted by the port gas flow rate adjusting unit 54b is supplied to the port gas blowing unit 51b and blown out from there.

  As described above, the control device 59 includes the ship side control unit 59S and the ship bottom control unit 59B. The ship-side control unit 59S is configured to supply a desired gas flow rate to the starboard gas blowing unit 51a and the portside gas blowing unit 51b based on the navigation conditions and sea conditions, and the portside gas sending unit 55b. The starboard gas flow rate adjusting unit 54a and the starboard gas flow rate adjusting unit 54b are controlled.

  For example, the ship-side control unit 59S is set in advance based on the navigation speed v (speedometer of the ship 1), the rolling inclination angle θ (inclination sensor 80), and the wave height h (input of the observation equipment and crew of the ship 1). In order to supply the gas flow rate corresponding to the value of (v, θ, h) in the table or function to the starboard gas blowing part 51a and the portside gas blowing part 51b, The number of revolutions of the motor of the delivery part 55b, the opening degree of the valve of the starboard gas flow rate adjustment part 54a, and the opening degree of the valve of the port side gas flow rate adjustment part 54b are controlled. The ship-side control unit 59S performs feedback control using the gas flow rate values of the flow meter 56a and the flow meter 56b. For example, the flow rate of each of the flow meters 56a and 56b is controlled to be a predetermined flow rate, and the table or function corresponding to the predetermined flow rate is used as the table or function.

In this case, the same effect as that of the first embodiment can be obtained.
In addition, the starboard gas blowing portion 51a and the portside gas blowing portion 51b in the ship side gas blowing portion 51 have separate starboard gas supply devices 70a and port gas supply devices 70b. Thereby, when the hull 20 is tilted by rolling or the like and the water depth (water pressure) is different between the starboard gas blowing portion 51a and the portside gas blowing portion 51b, the starboard gas sending portion 55a is connected to the starboard gas blowing portion 51a. A gas having a pressure corresponding to the water depth can be supplied, and the port gas sending section 55b can supply a gas having a pressure corresponding to the water depth of the port gas blowing section 51b. That is, it is not necessary to adjust the pressure due to the pressure loss at the gas flow rate adjusting unit, and the energy consumption of the gas delivery unit is further suppressed, and more efficient gas blowing is possible.

(Third embodiment)
A configuration of a frictional resistance reduction type ship according to the third embodiment of the present invention will be described.
In the present embodiment, in the ship-side gas supply device 70, the ship-side gas delivery unit is not a compressor or a blower, but is a pressure adjusting unit 58 that reduces the pressure of the gas in the ship-bottom gas supply device 60. This is different from the case of the embodiment. In the following, differences from the first embodiment will be mainly described.

  FIG. 5 is a schematic side view showing an example of the configuration of a frictional resistance reduction ship according to the third embodiment of the present invention. In this figure, the configuration of the frictional resistance reduction type ship 1 is basically the same as that of the first embodiment (FIG. 1A). However, the configurations of the upstream portions of the ship-side gas supply device 70 and the ship-bottom gas supply device 60 in the gas blowing device 30 are different.

  The ship bottom gas supply device 60 includes a ship bottom gas delivery part 45, a first tank 47, a ship bottom gas flow path 43, and a ship bottom gas supply part 42. The ship bottom gas delivery unit 45 compresses and delivers the gas. The first tank 47 stores the gas sent from the ship bottom gas sending unit 45. The ship bottom gas flow path 43 is a pipe that supplies the gas in the first tank 47 (the gas from the ship bottom gas delivery unit 45) to the ship bottom gas supply unit 42. The ship bottom gas supply unit 42 is a gas supply chamber provided on the ship bottom gas blowing unit 41. The gas supply chamber is provided for each of one or a plurality of holes provided in the ship bottom gas blowing portion 41. The gas supplied through the ship bottom gas flow path 43 is blown out into the water from the ship bottom gas blowing portion 41.

  The ship-side gas supply device 70 includes a pressure adjusting unit 58, a second tank 57, a ship-side gas flow channel 53, and a ship-side gas supply unit 52. The pressure adjusting unit 58 depressurizes the gas in the first tank 47 and sends it to the second tank 57. The second tank 57 stores a low-pressure gas whose pressure is lower than that of the gas in the first tank 47. The ship-side gas flow channel 53 is a pipe that supplies the gas in the second tank 57 (the gas from the pressure adjusting unit 58) to the ship-side gas supply unit 52. The ship-side gas supply unit 52 is a gas supply chamber provided on the ship-side gas blowing unit 51. The gas supply chamber is provided for each of one or a plurality of holes provided in the ship-side gas blowing portion 51. The gas supplied through the ship-side gas flow channel 53 is blown out from the ship-side gas blowing part 51 into the water.

FIG. 6 is a schematic diagram showing details of the configuration of the gas blowing device 30.
The ship bottom gas supply device 60 includes a ship bottom gas delivery part 45, a first tank 47, a flow meter 46, a ship bottom gas flow rate adjustment part 44, a ship bottom supply part 42, and a ship bottom gas flow path 43. .

  The ship bottom gas delivery unit 45 is exemplified by a compressor, a blower, or a fan, and delivers gas. It is controlled by the ship bottom controller 59B of the control device 59. The first tank 47 stores the gas (relatively high pressure) delivered from the ship bottom gas delivery unit 45. The ship bottom gas channel 43 is a pipe connected to the ship bottom gas delivery part 45 and the ship bottom gas supply part 42. A first tank 47 is connected on the way. The gas stored in the first tank 47 is supplied from the ship bottom gas delivery unit 45 to the ship bottom gas supply unit 42. The flow meter 46 is provided in the middle of the ship bottom gas flow path 43. The flow rate of the gas flowing through the ship bottom gas channel 43 is measured and output to the ship bottom control unit 59B. The ship bottom gas flow rate adjusting unit 44 is provided in the middle of the ship bottom gas flow path 43. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship bottom controller 59B of the control device 59. The flow rate of the gas stored in the first tank 47 and supplied to the ship bottom supply unit 42 is adjusted. The ship bottom supply unit 42 is a gas supply chamber provided on the ship bottom gas blowing unit 41. The gas adjusted by the ship bottom gas flow rate adjusting unit 44 is supplied to the ship bottom gas blowing unit 41 and blown out into the water therefrom.

  The ship-side gas supply device 70 includes a pressure adjustment unit 58, a second tank 57, a flow meter 56, a starboard gas flow rate adjustment unit 54a, a portside gas flow rate adjustment unit 54b, a starboard supply unit 52a, and a starboard supply unit 52b. The ship side gas passage 53 is provided.

  The pressure adjustment unit 58 is exemplified by a pressure adjustment valve (regulator), and depressurizes the gas (relatively high pressure) in the first tank 47 and sends the gas (relatively low pressure) to the second tank 57. It is controlled by the ship side control unit 59S of the control device 59. The second tank 57 stores a relatively low-pressure gas obtained by reducing the pressure in the first tank 47. The ship-side gas flow channel 53 is a pipe connected to the pressure adjusting unit 58, the starboard gas supply unit 52a, and the portside gas supply unit 52b. The gas supplied from the pressure adjustment unit 58 via the second tank 57 is supplied to the starboard gas supply unit 52a and the portside gas supply unit 52b. The ship-side gas flow channel 53 is branched into a starboard gas supply unit 52a and a portside gas supply unit 52b at a midway node N1. The flow meter 56 is provided in the middle of the ship-side gas flow channel 53. The flow rate of the gas flowing through the ship side gas passage 53 is measured and output to the ship side control unit 59S. The starboard gas flow rate adjusting portion 54a is provided in the middle of the ship side gas flow channel 53 branched to the starboard side. The gas flow rate to the starboard side of the gas sent from the second tank 57 is adjusted. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship side control unit 59S of the control device 59. The starboard supply unit 52a is a gas supply chamber provided on the starboard gas blowing unit 51a. The gas adjusted by the starboard gas flow rate adjusting unit 54a is supplied to the starboard gas blowing unit 51a and blown out from there. The port side gas flow rate adjusting part 54b is provided in the middle of the ship side gas flow channel 53 branched to the port side. The gas flow rate to the port side of the gas sent from the second tank 57 is adjusted. Examples include butterfly valves, needle valves or gate valves. It is controlled by the ship side control unit 59S of the control device 59. The port supply unit 52b is a gas supply chamber provided on the port gas blowing unit 51b. The gas adjusted by the port gas flow rate adjusting unit 54b is supplied to the port gas blowing unit 51b and blown out from there.

  As described above, the control device 59 includes the ship side control unit 59S and the ship bottom control unit 59B. The ship bottom control unit 59B controls the ship bottom gas delivery unit 45 and the ship bottom gas flow rate adjustment unit 44 so as to supply a desired gas flow rate to the ship bottom gas blowing unit 41 based on navigation conditions and sea conditions. Similarly, the ship-side control unit 59S controls the pressure adjustment unit 58 and the starboard gas flow rate adjustment so as to supply a desired gas flow rate to the starboard gas blowing unit 51a and the portside gas blowing unit 51b based on the navigation conditions and sea conditions. The unit 54a and the port gas flow rate adjusting unit 54b are controlled.

  For example, the ship-side control unit 59S is set in advance based on the navigation speed v (from the speedometer of the ship 1), the rolling inclination angle θ (inclination sensor 80), and the wave height h (input of the observation equipment and crew of the ship 1). The secondary pressure (second tank) of the pressure adjusting unit 58 so as to supply the gas flow rate corresponding to the value of (v, θ, h) in the table or function to the starboard gas blowing unit 51a and the portside gas blowing unit 51b. 57), the opening degree of the valve of the starboard gas flow rate adjustment unit 54a, and the opening degree of the valve of the port side gas flow rate adjustment unit 54b. The ship-side control unit 59S performs feedback control using the gas flow rate value of the flow meter 56. For example, the flow rate of the flow meter 56 is controlled to be a predetermined flow rate, and the table or function corresponding to the predetermined flow rate is used as the table or function. Similarly, the ship bottom control unit 59B generates a gas flow rate corresponding to the value of (v, θ, h) in a predetermined table or function based on the navigation speed v, the rolling inclination angle θ, and the wave height h, and the ship bottom gas blowing unit 41. The motor rotation speed of the ship bottom gas delivery part 45 and the opening degree of the valve of the ship bottom gas flow rate adjustment part 44 are controlled so as to be supplied to the engine. The ship bottom control unit 59B performs feedback control using the gas flow rate value of the flow meter 46. For example, the flow rate of the flow meter 46 is controlled to be a predetermined flow rate, and the table or function corresponding to the predetermined flow rate is used as the table or function.

In this case, the same effect as that of the first embodiment can be obtained.
In addition, the configuration of the gas blowing device 30 can be simplified. In addition, the number of gas delivery units (compressor, blower, etc.) can be reduced to one, and the cost can be reduced.

  It should be noted that another pressure adjusting unit 58 ′ is connected to the first tank 47, and another pressure adjusting unit 58 ′, another second tank 57 ′, another flow meter 57 ′, and port gas are used for the port gas blowing unit 51b. Another ship-side gas flow path 53 ′ connected to the flow rate adjusting unit 54b and the port side supply unit 52b is provided, and the original pressure adjusting unit 58, the second tank 57, the flow meter 57, the starboard gas flow rate adjusting unit 54a, and the starboard supply are provided. It is also possible to use the ship side gas flow path 53 connected to the part 52a for the starboard gas blowing part 51a. In that case, the effect which combined the effect of this Embodiment and the effect of 2nd Embodiment can be acquired.

  The present invention is not limited to the embodiments described above, and it is obvious that the embodiments can be appropriately modified or changed within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Friction resistance reduction type ship 2 Bow part 3 Stern part 4 Ship side 4a Starboard ship side 4b Port side ship side 5 Ship bottom 6 Tip part 8 Middle part 10 Hull outer plate 20 Hull 21 Propeller 22 Rudder 30 Gas blowing device 41 Bottom gas blowing part 42 Ship bottom gas Supply part 43 Gas flow path for ship bottom 44 Ship bottom gas flow rate adjustment part 45 Ship bottom gas delivery part 46 Flowmeter 47 First tank 51 Ship side gas blowing part 51a Starboard gas blowing part 51b Portside gas blowing part 52 Ship side gas supply part 52a Starboard supply part 52b Starboard supply section 53 Ship side gas flow path 53a Starboard gas flow path 54a Starboard gas flow rate adjustment part 54b Port side gas flow rate adjustment part 55 Ship side gas delivery part 55a Starboard gas delivery part 55b Port side gas delivery part 56, 56a, 56b 57 Second tank 58 Pressure adjusting unit 59 Control device 59S Ship side control 59B ship bottom control unit 60 the ship bottom gas supply device 70 side skin gas supply apparatus 70a starboard gas supply apparatus 70b port gas delivery system 80 tilt sensor

Claims (8)

A plurality of gas blowing portions provided at a plurality of positions at different water depths from the draft line of the still water surface in the ship, and capable of blowing out the gas;
A frictional resistance-reducing ship, comprising: a plurality of gas supply devices that are provided corresponding to the plurality of gas blowing portions and supply gas to the plurality of gas blowing portions. In the frictional resistance reduction ship according to claim 1,
The plurality of gas blowing portions are
A ship bottom gas blowing section provided on the ship bottom of the ship and capable of blowing gas;
The ship bottom gas blowing part is provided at the ship side of both sides of the ship, which is at a position where the water depth is different, and comprises a starboard gas blowing part and a port gas blowing part capable of blowing gas,
The plurality of gas supply devices include:
A ship bottom gas supply device for supplying gas to the ship bottom gas blowing part via a ship bottom gas flow path;
Friction that supplies gas to the starboard gas blowing section and the portside gas blowing section via a ship-side gas flow path different from the ship-bottom gas flow path, and includes a ship-side gas supply apparatus that is different from the ship-bottom gas supply apparatus. Resistance reduction ship. In the frictional resistance reduction ship according to claim 2,
The ship-side gas supply device is
A ship-side gas delivery section for delivering gas;
A starboard gas flow rate adjusting unit for adjusting the gas flow rate to the starboard side of the gas sent from the ship side gas delivery unit,
A starboard supply unit for supplying the gas adjusted from the starboard gas flow rate adjustment unit to the starboard gas blowing unit;
A port gas flow rate adjusting unit that adjusts the gas flow rate to the port side of the gas sent from the ship side gas sending unit, and
A friction resistance-reducing ship comprising: a port supply unit that supplies the gas adjusted by the port gas flow rate adjustment unit to the port gas blowing unit. In the frictional resistance reduction ship according to claim 3,
The ship bottom gas supply device comprises:
Sending out gas, and a ship bottom gas sending part different from the ship side gas sending part;
A ship bottom gas flow rate adjusting unit for adjusting a flow rate of the gas sent from the ship bottom gas sending unit;
A ship for reducing frictional resistance, comprising: a ship bottom supply part that supplies the gas adjusted by the ship bottom gas flow rate adjustment part to the ship bottom gas blowing part. In the frictional resistance reduction ship according to claim 2,
The ship-side gas supply device is
Starboard gas delivery section for delivering gas;
A starboard gas flow rate adjustment unit for adjusting the flow rate of the gas sent from the starboard gas delivery unit;
A starboard supply unit for supplying the gas adjusted by the starboard gas flow rate adjustment unit to the starboard gas blowing unit;
A port gas delivery section for delivering gas;
A port gas flow rate adjusting unit for adjusting the flow rate of the gas sent from the port gas sending unit;
A friction resistance-reducing ship comprising: a port supply unit that supplies the gas adjusted by the port gas flow rate adjustment unit to the port gas blowing unit. In the frictional resistance reduction ship according to claim 5,
The ship bottom gas supply device comprises:
Sending out gas, and a ship bottom gas sending part different from the ship side gas sending part;
A ship bottom gas flow rate adjusting unit for adjusting a flow rate of the gas sent from the ship bottom gas sending unit;
A ship for reducing frictional resistance, comprising: a ship bottom supply part that supplies the gas adjusted by the ship bottom gas flow rate adjustment part to the ship bottom gas blowing part. In the frictional resistance reduction ship according to claim 2,
The ship bottom gas supply device comprises:
A ship bottom gas delivery section for delivering gas;
A ship bottom gas flow rate adjusting unit for adjusting a flow rate of the gas sent from the ship bottom gas sending unit;
A ship bottom supply part for supplying the gas adjusted by the ship bottom gas flow rate adjustment part to the ship bottom gas blowing part,
The ship-side gas supply device is
A pressure adjusting unit that regulates and delivers the gas delivered from the ship bottom gas delivery unit;
A starboard gas flow rate adjustment unit that adjusts the gas flow rate to the starboard side of the gas sent from the pressure adjustment unit, and
A starboard supply unit for supplying the gas adjusted by the starboard gas flow rate adjustment unit to the starboard gas blowing unit;
A port gas flow rate adjustment unit that adjusts the gas flow rate to the port side of the gas sent from the pressure adjustment unit, and
A friction resistance-reducing ship comprising: a port supply unit that supplies the gas adjusted by the port gas flow rate adjustment unit to the port gas blowing unit. In the frictional resistance reduction ship according to claim 7,
The ship bottom gas supply device comprises:
A first tank for storing the gas sent from the ship bottom gas delivery unit;
The gas stored in the first tank is supplied to the ship bottom gas flow rate adjustment unit and the pressure adjustment unit,
The ship-side gas supply device is
A second tank for storing the gas sent from the pressure adjusting unit;
The friction resistance reducing ship in which the gas stored in the second tank is supplied to the starboard gas flow rate adjustment unit and the portside gas flow rate adjustment unit.

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