Gas diversion and venting apparatus and air-layer drag-reduction ship

Abstract

A gas diversion and venting apparatus and an air-layer drag-reduction ship. The apparatus is enclosed and defined by an inner side surface (123), an outer side surface (124), and two end surfaces (121), the two end surfaces (121) being opposite to each other in a first direction, and the inner side surface (123) being opposite to the outer side surface (124). The outer side surface (124) is a smooth curved surface which protrudes outwards, and the inner side surface (123) is a planar surface. Transition between the inner side surface (123) and the outer side surface (124) is achieved via a transition straight edge (125), one end surface (121), a transition arc edge (126), and the other end surface (121) which are connected to form a closed structure. The transition straight edge (125) extends in the first direction, and in the first direction, the transition arc edge (126) first moves away from the transition straight edge (125) and then approaches the transition straight edge (125). From one end surface (121) to the other end surface (121) along the first direction, a projection of the gas diversion and venting apparatus onto a plane perpendicular to the first direction first expands and then contracts while the shape of the projection remains unchanged. The gas diversion and venting apparatus is symmetrically arranged with respect to a central longitudinal section.

Description

Gas diversion and deflation device and air layer drag reduction ship

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 11, 2024, with application number 202410040501.6, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of ship technology, for example, to a gas diversion and deflation device and an air layer drag reduction ship. Background Art

[0003] Ship air layer drag reduction technology involves introducing gas into the bottom of the ship, allowing it to cover the outer plating and change the fluid medium around the hull to reduce the ship's frictional resistance. In this application, as the gas is continuously ejected and the ship moves forward, the gas diffuses backward downstream, significantly affecting the stern flow field and even entering the propeller operating area, reducing propeller propulsion efficiency and negatively affecting the ship's energy efficiency.

[0004] Summary of the Invention

[0005] The present application provides a gas diversion and deflation device and an air layer drag reduction ship, which are used to form a pressure difference with high pressure in the middle and low pressure on both sides locally, so as to change the local flow field and divert and guide the airflow.

[0006] The present application provides a gas diversion and degassing device, which is surrounded by an inner side surface, an outer side surface and two end surfaces, and 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 by a transition straight edge connected end to end, one end surface, a transition arc edge and another end surface, and 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] In one or more embodiments, a projection of the gas diversion and leaking device in a plane perpendicular to the first direction is a half-tear drop shape.

[0008] In one or more embodiments, in a plane perpendicular to the first direction, the farthest point from the projection straight line of the inner side surface on the projection curve of the outer side surface in the plane perpendicular to the first direction 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] In one or more embodiments, the gas diversion and degassing device is composed of a three-dimensional smooth curved surface extending to a predetermined thickness.

[0010] In one or more embodiments, the gas diversion and deflation device is integrally formed.

[0011] In one or more embodiments, 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] The present application also provides an air layer drag reduction ship, comprising a ship body and 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 sequentially along the direction from the bow of the ship body to the stern of the ship body.

[0013] In one or more embodiments, the thickness of the gas diversion and degassing device is a, the thickness of the cavitation skirt is b, and b≤a≤1.5b.

[0014] In one or more embodiments, in the second direction, the distance between the gas diversion and degassing device and the cavitation skirt is c, 2b≤c≤5b, and the second direction is the length direction of the ship body.

[0015] In one or more embodiments, 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 is e, 0.9e≤d≤1.1e, and the third direction is the width direction of the ship body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic structural diagram of a gas diversion and deflation device and a ship provided in an embodiment of the present application from a first perspective;

[0017] FIG2 is a schematic structural diagram of a gas diversion and deflation device and a ship provided in an embodiment of the present application from a second perspective;

[0018] FIG3 is a schematic structural diagram of a gas diversion and degassing device provided in an embodiment of the present application;

[0019] FIG4 is a schematic structural diagram of the gas diversion and deflation device and the ship provided in an embodiment of the present application from a third perspective.

[0020] In the picture:

[0021] 100. Ship body; 110. Cavitation skirt; 120. Gas diversion and venting device; 121. End surface; 122. First section; 123. Inner side surface; 124. Outer side surface; 125. Transition straight edge; 126. Transition curved edge; 127. Highest point; 130. Propeller; 140. Section. DETAILED DESCRIPTION

[0022] The technical solution of the present application will be described below in conjunction with the accompanying drawings. The described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0023] In the description of this application, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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 being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] In the description of this application, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. The meanings of the above terms in this application can be understood based on actual circumstances.

[0025] The following describes embodiments of the present application. 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 intended only to explain the present application and are not to be construed as limiting the present application.

[0026] In one embodiment, a vessel employing air jet drag reduction technology is equipped with cavitation skirts at the bottom. These cavitation skirts are of a certain height, confining the air layer on the bottom surface of the vessel's hull within their interior, preventing it from escaping laterally, thereby achieving a good drag reduction effect. The cavitation skirts are generally arranged on both sides of the vessel's hull bottom, symmetrically about the second cross-section.

[0027] 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.

[0028] As shown in Figures 1 to 4, this embodiment provides an air layer drag reduction ship, including a ship body 100 and a propeller 130, a gas diversion and degassing device 120 and two cavitation skirts 110 installed on the bottom plate of the ship body 100. The two cavitation skirts 110 are symmetrically arranged about the section 140, and the propeller 130 and the gas diversion and degassing device are symmetrically arranged about the section 140. The section 140 is the central longitudinal section of the ship body 100. The projections of the cavitation skirts 110, the gas diversion and degassing device and the propeller 130 on the central longitudinal section are spaced sequentially along the direction from the bow of the ship body 100 to the stern of the ship body 100 (the length direction of the ship body 100).

[0029] This air layer drag reduction vessel utilizes a design in which a gas diversion and venting device 120 is installed at the bottom of the vessel's hull 100. By providing a special configuration component at the rear end of the hull's bottom air pocket, which concentrates pressure in the middle and releases pressure on both sides, the vessel alters the local flow field, creating a pressure differential in the lateral and vertical directions. This diversion causes the bottom gas to flow toward the sides of the vessel's hull 100 as it passes through the gas diversion and venting device 120, and then escapes through the gap between the gas diversion and venting device 120 and the forward air pocket skirt 110. This achieves the purpose of diverting and venting the downstream gas in the hull's bottom air layer, preventing the downstream gas from continuing to flow backward into the propeller 130 area, eliminating the negative impact of the downstream gas on the propulsion efficiency of the vessel's hull 100, and improving the application effect of the air layer drag reduction technology. Furthermore, the gas diversion and venting device 120 is installed at the rear end of the bottom plate of the vessel's hull 100, with a certain gap between it and the air pocket 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 escape 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.

[0030] This embodiment also 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 123, 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 123 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 123 is a plane; the inner side surface 123 and the outer side surface 124 are connected by a transition straight edge 125 connected end to end, an end surface 121, and a transition arc edge 125. 26 transitions to the other end face 121, the transition straight edge 125 extends along the first direction, and in the first direction, the transition arcuate edge 126 first moves away from and then approaches the transition straight edge 125; along the first direction from one end face 121 to the other end face 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 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.

[0031] 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 cross-section 122 in the center, thereby forming a pressure difference in the thickness direction. In the first direction, the projection of the gas diversion and degassing device 120 from one end face 121 (first end) to the first cross-section 122 (central longitudinal cross-section) gradually increases, and similarly, the projection from the other end face 121 (second end) to the end faces 121 at both ends to the first cross-section 122 in the center gradually increases, thereby providing space for gas to escape from both sides. The above structure enables the gas diversion and degassing device 120 to form a pressure difference with a high middle and low sides in a local area, and change the local flow field to achieve diversion and guidance of the airflow.

[0032] In this embodiment, the first direction is parallel to the third direction, and the thickness direction is perpendicular to the inner side surface 123 .

[0033] In this embodiment, the projection of the gas diverter and degassing device 120 on a plane perpendicular to the first direction is a semi-teardrop shape. The semi-teardrop shape has a simple and reliable structure, high structural stability, and good stress resistance. It can meet the structural requirements of the gas diverter and degassing device 120, reduce the production difficulty of the gas diverter and degassing device 120, and ensure the long-term stable operation of the gas diverter and degassing device 120.

[0034] In one or more embodiments, the point on the projected curve of the outer side surface 124 in the plane perpendicular to the first direction, which is farthest from the projected straight line of the inner side surface 123, is defined as a peak point 127. The distance between the peak point 127 and the projected point of the transition arcuate edge 126 is smaller than the distance between the peak point 127 and the projected point of the transition straight edge 125. The above definition defines the structure of the gas diverter and degassing device 120, limits the degree of outward protrusion of the outer side surface 124, and ensures the gas diverter and degassing capability of the gas diverter and degassing device 120.

[0035] For example, the gas diverter / degassing device 120 is constructed from a three-dimensional, smooth curved surface extending through a predetermined thickness. This allows the entire surface of the gas diverter / degassing device 120 to smoothly transition through the three-dimensional curved surface, minimizing ridges on the surface of the gas diverter / degassing device 120 downstream of the gas layer. This reduces the water resistance of the gas diverter / degassing device 120 and improves its performance.

[0036] In this embodiment, the gas diverter and deflation device 120 is integrally formed. The integrally formed design improves the structural strength of the gas diverter and deflation device 120, ensures structural stability, reduces the risk of accidental damage to the gas diverter and deflation device 120, and extends its service life.

[0037] For example, inner side 123 is provided with a connection area (the entire inner side 123 is the connection area), and the gas diverter and degassing device is connected to the external equipment at the connection area. The above definition allows the outward-convex guide structure at the rear of the gas diverter and degassing device 120 to be fixed to the surface of the bottom plate of the ship body 100, which helps to ensure that the gas diverter and degassing device 120 is located at the rear end of the bottom plate of the ship body 100. The symmetry of the gas diverter and degassing device 120 with respect to the cross-section 140 ensures that the gas diverter and degassing device 120 is arranged downstream of the cavitation skirt 110 on both sides of the bottom of the air layer drag reduction system, thereby achieving smooth installation of the gas diverter and degassing device 120 on the air layer drag reduction ship.

[0038] In this embodiment, the thickness of the gas diverter and deflation device 120 is a, and the thickness of the cavitation skirt 110 is b, where b≤a≤1.5b. The above limitations optimize the design of the thicknesses of the gas diverter and deflation device 120 and the cavitation skirt 110. Considering that if a is too small, the gas diversion and guidance effect is not significant, and if a is too large, it will increase the resistance of the ship, b≤a≤1.5b is a more optimal value range.

[0039] In one or more embodiments, the distance between the gas diverter and degassing device 120 and the cavitation skirt 110 in the second direction is c, and 2b≤c≤5b, where the second direction is the length direction of the vessel body 100. The above definition optimizes the design of the distance between the gas diverter and degassing 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 escape of gas on both sides, 2b≤c≤5b is a preferred numerical range.

[0040] In this embodiment, in the third direction, the width of the gas diverter and deflation device 120 is d, the distance between the ends of the two cavitation skirts 110 is e, and 0.9e≤d≤1.1e. The third direction is the width of the ship body 100. The above definition achieves an optimized design of the length of the gas diverter and deflation device 120 and the distance between the ends of the two cavitation skirts 110. Considering that if d is too small, the diverted gas may still enter the propeller operating area, and if d is too large, it will increase the ship's resistance, 0.9e≤d≤1.1e is a preferred numerical range.

Claims

1. A gas diversion and relief device, which is surrounded by an inner side surface (123), 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. The inner side surface (123) is arranged opposite to the outer side surface (124). The outer side surface (124) is a smooth convex curved surface, and the inner side surface (123) is a plane. The inner side surface (123) and the outer side surface (124) are transitioned by a transition straight edge (125) connected end to end, one of the end surfaces (121), a transition arc edge (126) and the other end surface (121). 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 surface (121) to the other end surface (121), the projection of the gas diversion and relief device in a plane perpendicular to the first direction first expands and then shrinks, and the projection shape remains unchanged. The gas diversion and relief 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 relief device and is perpendicular to the first direction.

2. The gas diversion and pressure relief device according to claim 1, wherein, The projection of the gas diversion and relief device in a plane perpendicular to the first direction is semi-drop-shaped.

3. The gas splitting and bleeding device according to claim 2, wherein In a plane perpendicular to the first direction, the farthest point from the projection straight line of the inner side surface (123) on the projection curve of the outer side surface (124) in the plane perpendicular to the first direction is defined as the highest point (127). The distance between the highest point (127) and the projection point of the transition arc edge (126) is less than the distance between the highest point (127) and the projection point of the transition straight edge (125).

4. The gas diversion and pressure relief device according to claim 1, wherein, The gas diversion and relief device is formed by extending a three-dimensional smooth curved surface by a predetermined thickness.

5. The gas splitting and deflating device according to claim 1, wherein, The gas diversion and relief device is integrally formed.

6. The gas shunt and bleed device according to any one of claims 1 to 5, wherein, The inner side surface (123) is provided with a connection area, and the gas diversion and relief device is connected to an external device at the connection area.

7. An air layer drag reduction ship, including a ship body (100), a propeller (130) installed on the ship body (100), the gas diversion and relief device according to any one of claims 1 to 6, and two cavitation skirts (110). The two cavitation skirts (110) are symmetrically arranged with respect to a section (140). The propeller (130) and the gas diversion and relief device are symmetrically arranged with respect to the section (140). The section (140) is the central longitudinal section of the ship body (100). The projections of the cavitation skirt (110), the gas diversion and relief 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).

8. The air layer drag reduction ship according to claim 7, wherein, The thickness of the gas diversion and relief device is a, and the thickness of the cavitation skirt (110) is b, where b ≤ a ≤ 1.5b.

9. The air layer drag reduction ship according to claim 8, wherein, In a first direction, the distance between the gas diversion and degassing device and the cavitation skirt (110) is c, 2b≤c≤5b, and the first direction is the length direction of the ship body (100).

10. The air layer drag reduction ship according to claim 7, wherein, In the second 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 second direction is the width direction of the ship body (100).

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