Gas shunting and releasing device and gas layer resistance reduction ship

Abstract

The utility model relates to the technical field of ships, and particularly discloses a gas shunting and deflating device and a gas layer resistance reduction ship. The device is defined by an inner side face, an outer side face and two end faces, the two end faces are oppositely arranged in the first direction, and the inner side face and the outer side face are oppositely arranged; the outer side face is a smooth curved face protruding outwards, and the inner side face is a plane. The inner side face and the outer side face are in transition through a transition straight edge, one end face, a transition arc-shaped edge and the other end face which are connected end to end, the transition straight edge extends in the first direction, and in the first direction, the transition arc-shaped edge firstly gets away from the transition straight edge and then gets close to the transition straight edge; from one end face to the other end face in the first direction, the projection of the gas flow dividing and discharging device in a plane perpendicular to the first direction is enlarged and then reduced, and the projection shape is not changed; and the gas shunting and releasing devices are symmetrically arranged about the central longitudinal section. The structure of the device is improved, a pressure difference with high middle and low two sides is locally formed, a local flow field is changed, and air flow is shunted and guided.

Description

Technical Field

[0001] The utility model relates to the technical field of ships, in particular to a gas diversion and deflation device and an air layer drag reduction ship. Background Art

[0002] Ship air layer drag reduction technology refers to the purpose of reducing the friction resistance of the ship by introducing gas into the bottom of the ship so that the gas covers the outer plate of the bottom of the ship and changes the fluid medium around the hull. In the application of this technology, as the gas is continuously ejected and the ship sails forward, the gas diffused backward from the downstream will have a significant impact on the stern flow field, and even enter the propeller working area, reducing the propeller propulsion efficiency and having a negative impact on the ship's energy efficiency.

[0003] Therefore, there is an urgent need for a device suitable for ship jet drag reduction technology to play a role in diverting and guiding the airflow and reduce the impact of downstream gas on the ship's propeller. Utility Model Content

[0004] The utility model aims to provide a gas diversion and deflation device and an air layer drag reduction ship, which are used to form a pressure difference with a high middle and low two sides locally, so as to change the local flow field and divert and guide the airflow.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A gas diversion and degassing device, the gas diversion and degassing device is surrounded by an inner side surface, an outer side surface and two end surfaces, the two end surfaces are arranged opposite to each other in a first direction, and the inner side surface is arranged opposite to the outer side surface; the outer side surface is a smooth curved surface convex outward, and the inner side surface is a plane; the inner side surface and the outer side surface are transitioned through a transition straight edge connected end to end, one end surface, a transition arc edge and another end surface, the transition straight edge extends along the first direction, and in the first direction, the transition arc edge first moves away from and then approaches the transition straight edge; along the first direction from one end surface to another end surface, the projection of the gas diversion and degassing device in a plane perpendicular to the first direction first expands and then shrinks, and the projection shape remains unchanged; the gas diversion and degassing device is symmetrically arranged with respect to a first section, and the first section is the central longitudinal section of the gas diversion and degassing device and is perpendicular to the first direction.

[0007] As a preferred technical solution of the gas diversion and degassing device, the projection of the gas diversion and degassing device in a plane perpendicular to the first direction is a half-water drop shape.

[0008] As a preferred technical solution for the gas diversion and venting device, in a plane perpendicular to the first direction, the point on the projection curve of the outer side surface in the plane perpendicular to the first direction that is farthest from the projection straight line of the inner side surface is defined as the highest point, and the distance between the highest point and the projection point of the transition arc edge is smaller than the distance between the highest point and the projection point of the transition straight edge.

[0009] As a preferred technical solution for the gas diversion and degassing device, the gas diversion and degassing device is composed of a three-dimensional smooth curved surface extending to a predetermined thickness.

[0010] As a preferred technical solution of the gas diversion and degassing device, the gas diversion and degassing device is integrally formed.

[0011] As a preferred technical solution of the gas diversion and degassing device, the inner side surface is provided with a connection area, and the gas diversion and degassing device is connected to an external device at the connection area.

[0012] An air layer drag reduction ship comprises a ship body, a propeller installed on the bottom plate of the ship body, the above-mentioned gas diversion and degassing device and two cavitation skirts, the two cavitation skirts are symmetrically arranged with respect to a second section, the propeller and the gas diversion and degassing device are symmetrically arranged with respect to the second section, the second section is the central longitudinal section of the ship body, and the projections of the cavitation skirts, the gas diversion and degassing device and the propeller on the central longitudinal section are spaced in sequence along the direction from the bow of the ship body to the stern of the ship body.

[0013] As a preferred technical solution for air layer drag reduction ships, the thickness of the gas diversion and air release device is a, the thickness of the cavitation skirt is b, and b≤a≤1.5b.

[0014] As a preferred technical solution for air layer drag reduction ships, in the second direction, the distance between the gas diversion and venting device and the cavitation skirt is c, 2b≤c≤5b, and the second direction is the length direction of the ship body.

[0015] As a preferred technical solution for air layer drag reduction ships, in the third direction, the width of the gas diversion and venting device is d, the distance between the ends of the two cavitation skirts is e, 0.9e≤d≤1.1e, and the third direction is the width direction of the ship body.

[0016] Beneficial effects of the utility model:

[0017] The gas diversion and degassing device adopts a three-dimensional curved surface structure, which is higher in the middle and lower on both sides in the thickness direction; in the first direction, the middle is protruding and the two sides are flat, and the entire three-dimensional curved surface has a smooth transition. This allows the gas diversion and degassing device to gradually rise from the end faces at both ends to the first section in the center, thereby forming a pressure difference in the thickness direction. In the first direction, the gas diversion and degassing device gradually increases from the first end to the central longitudinal section, and similarly, the second end to the end faces at both ends to the first section in the center gradually increases, thereby providing space for the gas to escape from both sides. The above specific structure enables the gas diversion and degassing device to locally form a pressure difference with a high middle and low sides, and change the local flow field to achieve the diversion and guidance of the airflow.

[0018] The air layer drag reduction ship is designed to install a gas diversion and air release device at the bottom of the ship body, and to set a special configuration component at the tail end of the ship bottom air cavity to concentrate the middle pressure and release the pressure on both sides, so as to change the local flow field and form a pressure difference in the lateral and vertical directions, so that the gas at the bottom of the ship is diverted to the two sides of the ship body when passing through the gas diversion and air release device, and leaks through the gap between the gas diversion and air release device and the front air cavity skirt, thereby achieving the purpose of diverting and air release of the downstream gas of the ship bottom air layer, avoiding the situation that the downstream gas continues to flow backward into the propeller area, eliminating the negative impact of the downstream gas on the propulsion efficiency of the ship body, and improving the application effect of the air layer drag reduction technology. In addition, the diversion and air release device is installed at the tail of the bottom plate of the ship body, and a certain gap is left between it and the air cavity skirt. By setting this structure on the flow path of the gas, it is possible to further inhibit the airflow from flowing directly to the propeller, and guide the airflow to leak from the two sides of the hull, thereby reducing the influence of the air layer drag reduction system on the propeller propulsion and improving the overall navigation performance of the air layer drag reduction ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a gas diversion and deflation device and a ship provided by an embodiment of the utility model in a first-person perspective;

[0020] Figure 2 It is a structural schematic diagram of a gas diversion and deflation device and a ship provided by an embodiment of the utility model at a second viewing angle;

[0021] Figure 3 It is a structural schematic diagram of a gas diversion and degassing device provided in an embodiment of the utility model.

[0022] In the figure:

[0023] 100. Ship body; 110. Cavitation skirt; 120. Gas diversion and venting device; 121. End face; 122. First section; 124. Outer side face; 125. Transition straight edge; 126. Transition arc edge; 130. Propeller; 140. Second section. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the prior art, a cavitation skirt is installed at the bottom of a ship using jet drag reduction technology. The cavitation skirt has a certain height, so that the air layer on the bottom surface of the ship body is enclosed within its internal range and will not escape from the side, thereby producing a good drag reduction effect. The cavitation skirt is generally arranged on both sides of the bottom of the ship body and is symmetrical about the second section.

[0029] As the ship sails forward, water and air will flow backward. In the absence of other interference, the gas in the air pocket at the bottom of the ship will naturally flow along the surface of the hull to the stern of the ship and enter the working area of ​​the propeller, which will have a negative impact on the propulsion efficiency of the ship and is not conducive to the overall navigation performance of the ship.

[0030] like Figures 1 to 3 As shown, this embodiment provides an air layer drag reduction ship, including a ship body 100 and a propeller 130 installed on the bottom plate of the ship body 100, a gas diversion and degassing device 120 and two cavitation skirts 110, the two cavitation skirts 110 are symmetrically arranged about the second section 140, the propeller 130 and the gas diversion and degassing device are symmetrically arranged about the second section 140, the second section 140 is the central longitudinal section of the ship body 100, and the projections of the cavitation skirt 110, the gas diversion and degassing device and the propeller 130 on the central longitudinal section are spaced in sequence along the direction from the bow of the ship body 100 to the stern of the ship body 100.

[0031] The air layer drag reduction ship is designed to install a gas diversion and venting device 120 at the bottom of the ship body 100, and to set a special configuration component at the tail end of the ship bottom air cavity to concentrate the middle pressure and release the pressure on both sides, so as to change the local flow field and form a pressure difference in the horizontal and vertical directions, so that the ship bottom gas is diverted to the two sides of the ship body 100 when passing through the gas diversion and venting device 120, and leaks through the gap between the gas diversion and venting device 120 and the front air cavity skirt 110, thereby achieving the purpose of diverting and venting the downstream gas of the ship bottom air layer, avoiding the situation that the downstream gas continues to flow backward into the propeller 130 area, eliminating the negative impact of the downstream gas on the propulsion efficiency of the ship body 100, and improving the application effect of the air layer drag reduction technology. In addition, the diversion and venting device 120 is installed at the tail of the bottom plate of the ship body 100, and a certain gap is left between it and the air cavity skirt 110. By setting this structure on the gas flow path, the airflow can be further suppressed from flowing directly to the propeller 130, and the airflow can be guided to leak from the sides of the hull, thereby reducing the impact of the air layer drag reduction system on the propulsion of the propeller 130 and improving the overall navigation performance of the air layer drag reduction ship.

[0032] The present embodiment further provides a gas diversion and degassing device 120, which is applied to the above-mentioned air layer drag reduction ship. The gas diversion and degassing device 120 is surrounded by an inner side surface, an outer side surface 124 and two end surfaces 121. The two end surfaces 121 are arranged opposite to each other in the first direction, and the inner side surface and the outer side surface 124 are arranged opposite to each other; the outer side surface 124 is a smooth curved surface convex outward, and the inner side surface is a plane; the inner side surface and the outer side surface 124 are connected by a transition straight edge 125 connected end to end, an end surface 121, a transition arc edge 126 and another The end face 121 transitions, and the transition straight edge 125 extends along the first direction. In the first direction, the transition arc edge 126 first moves away from and then approaches the transition straight edge 125; along the first direction from one end face 121 to another end face 121, the projection of the gas diversion and degassing device in the plane perpendicular to the first direction first expands and then shrinks, and the projection shape remains unchanged; the gas diversion and degassing device 120 is symmetrically arranged about the first section 122, and the first section 122 is the central longitudinal section of the gas diversion and degassing device 120 and is perpendicular to the first direction.

[0033] The gas diversion and degassing device 120 adopts a three-dimensional curved surface structure, which is higher in the middle and lower on both sides in the thickness direction; in the first direction, the middle is protruding and the two sides are flat, and the entire three-dimensional curved surface has a smooth transition. This allows the gas diversion and degassing device 120 to gradually rise from the end faces 121 at both ends to the first section 122 in the center, thereby forming a pressure difference in the thickness direction. In the first direction, the gas diversion and degassing device 120 gradually grows from the first end 121 to the central longitudinal section 122, and similarly, the second end 123 to the end faces 121 at both ends to the first section 122 in the center gradually grows, thereby providing space for gas to escape from both sides. The above specific structure enables the gas diversion and degassing device 120 to form a pressure difference with a high middle and low sides locally, and change the local flow field to achieve diversion and guidance of the airflow.

[0034] In this embodiment, the first direction is parallel to the third direction, and the thickness direction is perpendicular to the inner side surface.

[0035] In this embodiment, the projection of the gas diversion and degassing device 120 in a plane perpendicular to the first direction is a semi-water drop shape. The semi-water drop shape has a simple and reliable structure, high structural stability and good stress resistance, which can meet the structural requirements of the gas diversion and degassing device 120, reduce the production difficulty of the gas diversion and degassing device 120, and ensure that the gas diversion and degassing device 120 can operate stably for a long time.

[0036] Further, in a plane perpendicular to the first direction, the point on the projection curve of the outer side surface 124 in the plane perpendicular to the first direction that is farthest from the projection straight line of the inner side surface is defined as the highest point, and the distance between the highest point and the projection point of the transition arc edge 126 is smaller than the distance between the highest point and the projection point of the transition straight edge 125. The above definition plans the specific structure of the gas diversion and degassing device 120, limits the degree of outward protrusion of the outer side surface 124, and ensures the diversion and degassing capacity of the gas diversion and degassing device 120.

[0037] Exemplarily, the gas diversion and degassing device 120 is formed by extending a three-dimensional smooth curved surface with a predetermined thickness. The above definition allows the entire device surface of the gas diversion and degassing device 120 to smoothly transition through the three-dimensional curved surface, which can minimize the ridge structure on the surface of the diversion and degassing device 120 downstream of the gas layer, thereby reducing the resistance of the device 120 to water and improving the working effect of the gas diversion and degassing device 120.

[0038] In this embodiment, the gas diversion and degassing device 120 is integrally formed. The integrally formed design improves the structural strength of the gas diversion and degassing device 120, ensures the structural stability, reduces the risk of accidental damage to the gas diversion and degassing device 120, and prolongs the service life.

[0039] Exemplarily, a connection area is provided on the inner side, and the gas diversion and degassing device is connected to the external equipment at the connection area. The above definition enables the convex guide structure at the tail of the gas diversion and degassing device 120 to be fixed on the surface of the bottom plate of the ship body 100, which helps to ensure that the gas diversion and degassing device 120 is located at the tail end of the bottom plate of the ship body 100, and the symmetrical arrangement of the gas diversion and degassing device 120 about the second section 140 ensures that the gas diversion and degassing device 120 is arranged in the downstream direction of the cavitation skirt 110 on both sides of the bottom of the air layer drag reduction system, and realizes the smooth installation of the gas diversion and degassing device 120 on the air layer drag reduction ship.

[0040] In this embodiment, the thickness of the gas diversion and deflation device 120 is a, and the thickness of the cavitation skirt 110 is b, where b≤a≤1.5b. The above definition realizes the optimized design of the thickness of the gas diversion and deflation device 120 and the thickness of the cavitation skirt 110. Considering that if a is too small, the diversion and guiding effect of the gas is not obvious, and if a is too large, it will cause the ship resistance to increase, b≤a≤1.5b is the optimal value range.

[0041] Further, in the second direction, the distance between the gas diversion and venting device 120 and the cavitation skirt 110 is c, 2b≤c≤5b, and the second direction is the length direction of the ship body 100. The above definition realizes the optimal design of the distance between the gas diversion and venting device 120 and the cavitation skirt 110, considering that if c is too large, it may affect the drag reduction effect of the upstream air layer, and if c is too small, it will hinder the gas from leaking on both sides, and 2b≤c≤5b is the optimal value range.

[0042] In this embodiment, in the third direction, the width of the gas diversion and deflation device 120 is d, the distance between the ends of the two cavitation skirts 110 is e, 0.9e≤d≤1.1e, and the third direction is the width direction of the ship body 100. The above definition realizes the optimized design of the length of the gas diversion and deflation device 120 and the distance between the ends of the two cavitation skirts 110. Considering that if d is too small, the gas after diversion may still enter the propeller working area, if d is too large, it will cause the ship resistance to increase, 0.9e≤d≤1.1e is the optimal value range.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A gas diversion and deflation device, characterized in that: The gas diversion and degassing device is surrounded by an inner side surface, an outer side surface (124) and two end surfaces (121); the two end surfaces (121) are arranged opposite to each other in a first direction, and the inner side surface is arranged opposite to the outer side surface (124); the outer side surface (124) is a smooth curved surface convex outward, and the inner side surface is a plane; the inner side surface and the outer side surface (124) are transitioned by a transition straight edge (125) connected end to end, one end surface (121), a transition arc edge (126) and the other end surface (121); the transition straight edge (125) 125) extends along the first direction, and in the first direction, the transition arc edge (126) first moves away from and then approaches the transition straight edge (125); along the first direction from one end surface (121) to another end surface (121), the projection of the gas diversion and degassing device in a plane perpendicular to the first direction first expands and then shrinks, and the projection shape remains unchanged; the gas diversion and degassing device is symmetrically arranged with respect to a first section (122), and the first section (122) is the central longitudinal section of the gas diversion and degassing device and is perpendicular to the first direction.

2. The gas diversion and deflation device according to claim 1, characterized in that: In a plane perpendicular to the first direction, the point of the outer side surface (124) on the projection curve in the plane perpendicular to the first direction that is farthest from the projection straight line of the inner side surface is defined as the highest point, and the distance between the highest point and the projection point of the transition arc edge (126) is smaller than the distance between the highest point and the projection point of the transition straight edge (125).

3. The gas diversion and deflation device according to claim 1, characterized in that: The gas diversion and degassing device is composed of a three-dimensional smooth curved surface extending to a predetermined thickness.

4. The gas diversion and deflation device according to claim 1, characterized in that: The gas diversion and degassing device is integrally formed.

5. The gas diversion and deflation device according to any one of claims 1 to 4, characterized in that: The inner side surface is provided with a connection area, and the gas diversion and air release device is connected to external equipment at the connection area.

6. Air layer drag reduction ship, characterized in that: The invention comprises a ship body (100), a propeller (130) installed on the bottom plate of the ship body (100), a gas diversion and degassing device according to any one of claims 1 to 5, and two cavitation skirts (110), wherein the two cavitation skirts (110) are symmetrically arranged with respect to a second section (140), the propeller (130) and the gas diversion and degassing device are symmetrically arranged with respect to the second section (140), the second section (140) is a central longitudinal section of the ship body (100), and the projections of the cavitation skirts (110), the gas diversion and degassing device and the propeller (130) on the central longitudinal section are spaced in sequence along the direction from the bow of the ship body (100) to the stern of the ship body (100).

7. The air layer drag reduction ship according to claim 6, characterized in that: The thickness of the gas diversion and degassing device is a, the thickness of the cavitation skirt (110) is b, and b≤a≤1.5b.

8. The air layer drag reduction ship according to claim 7, characterized in that: In the second direction, the distance between the gas diversion and degassing device and the cavitation skirt (110) is c, 2b≤c≤5b, and the second direction is the length direction of the ship body (100).

9. The air layer drag reduction ship according to claim 6, characterized in that: In the third direction, the width of the gas diversion and degassing device is d, the distance between the ends of the two cavitation skirts (110) is e, 0.9e≤d≤1.1e, and the third direction is the width direction of the ship body (100).

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