Gas classification and discharge device, and air layer resistance reduction vessel

Abstract

The present application provides a gas classification and discharge device and an air layer resistance reduction vessel. The device is configured to be enclosed by an inner surface (123), an outer surface (124), and two end surfaces (121), the two end surfaces (121) are arranged opposite each other in a first direction, and the inner surface (123) and the outer surface (124) are arranged opposite each other; the outer surface (124) is a smooth curved surface that is convex outward, and the inner surface (123) is a flat surface; the inner surface (123) and the outer surface (124) are connected through a symmetrical transition straight side (125), one end surface (121), a transition arc side (126), and another end surface (121), the transition straight side (125) extends along a first direction, and in the first direction, the transition arc side (126) first moves away from the transition straight side (125) and then moves closer again; As moving from one end plane (121) to another end plane (121) along the first direction, the projection of the gas classification and discharge device in a plane perpendicular to the first direction is first enlarged and then reduced again, and the projection shape does not change; the gas classification and discharge device is arranged symmetrically with respect to the central cross-section.

Description

Technology Field

[0001] The present application claims priority to a Chinese patent application with application number 202410040501.6 filed with the Chinese Intellectual Property Office on January 11, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of marine technology, for example, to a gas diversion and venting apparatus and a vessel with reduced air layer resistance. Background Technology

[0003] Ship air layer drag reduction technology is a technology aimed at reducing frictional resistance of a ship by changing the fluid medium around the hull through the induction of gas into the bottom of the ship to cover the bottom plating. In the application of this technology, as gas is continuously ejected and the ship moves forward, the gas diffusing from downstream to aft has a significant effect on the stern flow field and even flows into the propeller operating area, thereby reducing propeller propulsion efficiency and having a negative impact on the ship's energy efficiency.

[0004] The present application provides a gas classification and discharge device used to classify and guide airflow by forming a local pressure difference that is high in the middle and low on both sides, thereby changing the local flow field, and an air layer resistance reduction vessel.

[0005] The present application provides a gas classification and discharge device, wherein the gas classification and discharge device is enclosed by an inner surface, an outer surface, and two end surfaces, wherein the two end surfaces are arranged opposite each other in a first direction, and the inner surface and the outer surface are arranged opposite each other; wherein the outer surface is a smooth curved surface convex outwardly, and the inner surface is a flat surface; wherein the transition between the inner surface and the outer surface is made through a symmetrical transition straight side, one end surface, a transition arc side, and another end surface, wherein the transition straight side extends along the first direction, and in the first direction, the transition arc side moves away from the transition straight side first and then moves closer again; wherein, as moving from one end surface to another end surface along the first direction, the projection of the gas classification and discharge device in a plane perpendicular to the first direction is first enlarged and then reduced again, and the projection shape remains unchanged; The above gas classification and discharge device is arranged symmetrically with respect to a first cross section, and the first cross section is the central longitudinal section of the gas classification and discharge device and is perpendicular to the first direction.

[0006] In one or more embodiments, the projection of the gas classification and discharge device in a plane perpendicular to the first direction is half-droplet shaped.

[0007] In one or more embodiments, within a plane perpendicular to the first direction, the point furthest from the projection line of the inner surface in the projection curve of the outer surface within the plane perpendicular to the first direction is defined as the highest point, and the interval between the highest point and the projection point of the transition arc side is smaller than the interval between the highest point and the projection point of the transition straight side.

[0008] In one or more embodiments, the gas classification and discharge device is configured such that a three-dimensional smooth curved surface extends to a predetermined thickness.

[0009] In one or more embodiments, the gas classification and discharge device is integrally molded.

[0010] In one or more embodiments, a connection area is provided on the inner surface, and the gas classification and discharge device is connected to an external facility in the connection area.

[0011] The present application further provides an air layer resistance reduction vessel, wherein the air layer resistance reduction vessel comprises a vessel body and a propeller mounted on the bottom plate of the vessel body, the gas sorting and exhaust device, and two air cavity skirt plates, wherein the two air cavity skirt plates are arranged symmetrically with respect to a second cross section, and the propeller and the gas sorting and exhaust device are arranged symmetrically with respect to the second cross section, wherein the second cross section is a central longitudinal cross section of the vessel body, and the projections of the air cavity skirt plates, the gas sorting and exhaust device, and the propeller in the central longitudinal cross section are arranged sequentially spaced apart along the direction from the bow of the vessel body to the stern of the vessel body.

[0012] In one or more embodiments, the thickness of the gas classification and discharge device is a, the thickness of the air cavity skirt plate is b, and b ≤ a ≤ 1.5 b.

[0013] In one or more embodiments, in the second direction, the distance between the gas classification and discharge device and the air cavity skirt plate is c, 2b≤c≤5b, and the second direction is the longitudinal direction of the ship body.

[0014] In one or more embodiments, in the third direction, the width of the gas classification and discharge device is d, and the distance between the ends of the two air cavity skirt plates is e, 0.9e≤d≤1.1e, and the third direction is the width direction of the ship body. Brief explanation of the drawing

[0015] FIG. 1 is a structural schematic diagram of a gas classification and discharge device and a ship at a first viewing angle according to an embodiment of the present application. FIG. 2 is a structural schematic diagram of a gas classification and discharge device and a ship at a second viewing angle according to an embodiment of the present application. FIG. 3 is a structural schematic diagram of a gas classification and exhaust device according to an embodiment of the present application. FIG. 4 is a structural schematic diagram of a gas classification and discharge device and a ship at a third viewing angle according to an embodiment of the present application. Specific details for implementing the invention

[0016] The technical solution of the present application is described below in conjunction with the attached drawings. The described embodiments are only some embodiments of the present application and not all embodiments.

[0017] In the description of this application, the directional or positional relationships indicated by terms such as "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," etc., are based on the directional or positional relationships depicted in the attached drawings. This is intended merely to facilitate and simplify the description of this application and does not imply or suggest that the mentioned device or component must have a specific direction or be configured and operated in a specific direction; therefore, it should not be interpreted as a limitation to this application. Furthermore, the terms "first" and "second" are used solely for illustrative purposes and should not be interpreted as indicating or implying relative importance. Here, the terms "first position" and "second position" refer to two distinct positions, and the statement that the first feature is "above," "upper," and "upper plane" of the second feature includes cases where the first feature is located directly above and diagonally above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The statement that the first feature is "below," "downward," and "underside" of the second feature includes cases where the first feature is located directly below and diagonally downward of the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0018] In the description of this application, unless otherwise specified or limited, the terms “mounting,” “connecting to one another,” and “connection” are to be understood in a broad sense and may, for example, be a fixed connection, a detachable connection, or an integral connection; may be a mechanical connection, an electrical connection; may be directly connected, indirectly connected through an intermediate medium, or communication within two components. The meaning of the above terms in this application may be understood according to the actual circumstances.

[0019] Embodiments of the present application are described below, and examples of said embodiments are illustrated in the drawings, wherein identical or similar reference numerals throughout the drawings indicate identical or similar components or components performing identical or similar functions. The embodiments described below with reference to the attached drawings are merely illustrative and are intended only to explain the present application and should not be understood as limiting the present application.

[0020] In one embodiment, an air cavity skirt plate is installed on the bottom of a ship to which air jet drag reduction technology is applied. Since the air cavity skirt plate has a certain height, it traps the air layer on the surface of the bottom of the ship's main body within the internal range of the air cavity skirt plate, thereby preventing leakage to the sides and obtaining an excellent drag reduction effect. The air cavity skirt plate is generally positioned on both sides of the bottom of the ship's main body and is symmetrical with respect to the second cross section.

[0021] As the ship's hull moves forward, both water and air currents flow backward, and in the absence of other interference, the gas in the air cavity at the bottom of the ship's hull naturally flows along the hull surface toward the tail of the ship and enters the operating area of ​​the propeller, which has a negative effect on the ship's propulsion efficiency and is detrimental to the ship's overall navigation performance.

[0022] As illustrated in FIGS. 1 to 4, the present embodiment provides an air layer resistance reduction vessel, comprising a vessel body (100) and a propeller (130) mounted on the bottom plate of the vessel body (100), a gas sorting and discharge device (120), and two air cavity skirt plates (110), wherein the two air cavity skirt plates (110) are symmetrically arranged with respect to a cross section (140), and the propeller (130) and the gas sorting and discharge device are symmetrically arranged with respect to a cross section (140), wherein the cross section (140) is a central longitudinal section of the vessel body (100), and the projections of the air cavity skirt plates (110), the gas sorting and discharge device and the propeller (130) in the central longitudinal section are sequentially spaced apart along the direction from the bow of the vessel body (100) to the stern of the vessel body (100) (the longitudinal direction of the vessel body (100)).

[0023] The above air layer resistance reduction vessel adopts a design method in which a gas classification and discharge device (120) is installed on the bottom of the vessel body (100), and by placing a special component at the tail end of the air cavity at the bottom of the vessel, in which pressure is concentrated in the middle and pressure is discharged to both sides, the local flow field is changed to form a pressure difference in the transverse and vertical directions, so that when the gas at the bottom of the vessel passes through the gas classification and discharge device (120), it is classified to the sides of the vessel body (100), and also discharged through the gap between the gas classification and discharge device (120) and the front air cavity skirt plate (110), thereby achieving the purpose of classifying and discharging the downstream gas of the bottom air layer, preventing the downstream gas from continuing to flow backward and entering the propeller (130) area, and by eliminating the negative effect that the downstream gas has on the propulsion efficiency of the vessel body (100), the application effect of the air layer resistance reduction technology is improved. Additionally, the gas classification and discharge device (120) is mounted on the tail portion of the bottom plate of the ship body (100) and is positioned at a certain distance from the air cavity skirt plate (110). By placing this structure in the gas flow path, the direct flow of airflow to the propeller (130) can be further suppressed, and the airflow can be guided to be discharged toward both sides of the hull, thereby reducing the influence of the air layer drag reduction system on the propeller (130) propulsion and improving the overall navigation performance of the air layer drag reduction ship.

[0024] In this embodiment, a gas classification and discharge device (120) applied to the air layer resistance reduction vessel is further provided, wherein the gas classification and discharge device (120) is configured to be surrounded by an inner surface (123), an outer surface (124), and two end surfaces (121), the two end surfaces (121) are arranged to face each other in a first direction, and the inner surface (123) and the outer surface (124) are arranged to face each other; the outer surface (124) is a smooth curved surface that is convex outward, and the inner surface (123) is a flat surface; The transition between the inner surface (123) and the outer surface (124) is made through a symmetrical transition straight side (125), one end surface (121), a transition arc-shaped side (126), and another end surface (121), the transition straight side (125) extends along the first direction, and in the first direction, the transition arc-shaped side (126) first moves away from the transition straight side (125) and then moves closer again; as it goes from one end surface (121) to another end surface (121) along the first direction, the projection of the gas classification and discharge device in a plane perpendicular to the first direction is first enlarged and then reduced again, and the projection shape does not change; the gas classification and discharge device (120) is arranged symmetrically with respect to the first cross-section (122), the first cross-section (122) is the central longitudinal cross-section of the gas classification and discharge device (120) and is perpendicular to the first direction.

[0025] The above gas classification and discharge device (120) adopts a three-dimensional curved surface structure in the thickness direction, with the middle being high and the sides being low; in the first direction, the middle is protruding, the sides are gentle, and the entire three-dimensional curved surface transitions smoothly. As a result, the gas classification and discharge device (120) gradually rises from the end surfaces (121) at both ends toward the first cross section (122) at the center, causing a pressure difference in the thickness direction. In the first direction, the projection of the gas classification and discharge device (120) from one end surface (121) (first end) toward the first cross section (122) (central longitudinal cross section) gradually increases, and similarly, the projection of the gas classification and discharge device (120) from the other end surface (121) (second end) toward the first cross section (122) at the center gradually increases, thereby providing space for gas to be discharged from both sides. Due to the above structure, the gas classification and discharge device (120) forms a local pressure difference that is high in the middle and low on both sides, and changes the local flow field to implement classification and guidance for the airflow.

[0026] In this embodiment, the first direction is parallel to the third direction, and the thickness direction is perpendicular to the inner surface (123).

[0027] In this embodiment, the projection of the gas classification and discharge device (120) in a plane perpendicular to the first direction is a half-tear shape. The half-tear shape structure is simple and reliable, has excellent structural stability and excellent stress conditions, and can satisfy the structural requirements of the gas classification and discharge device (120), lowers the difficulty of production of the gas classification and discharge device (120), and ensures that the gas classification and discharge device (120) can operate stably for a long period of time.

[0028] In one or more embodiments, within a plane perpendicular to the first direction, the point furthest from the projection line of the inner surface (123) in the projection curve of the outer surface (124) within the plane perpendicular to the first direction is defined as the highest point (127), and the distance between the highest point (127) and the projection point of the transition arc side (126) is smaller than the distance between the highest point (127) and the projection point of the transition straight side (125). The above limitation defines the structure of the gas classification and discharge device (120) and guarantees the classification and discharge capability of the gas classification and discharge device (120) by limiting the degree of protrusion to the outside of the outer surface (124).

[0029] For example, the gas classification and discharge device (120) is configured such that a three-dimensional smooth curved surface extends to a predetermined thickness. Through this limitation, the entire surface of the gas classification and discharge device (120) is smoothly transitioned through the three-dimensional curved surface, thereby minimizing the ridge structure of the surface of the gas classification and discharge device (120) downstream of the air layer, and furthermore, the resistance of the gas classification and discharge device (120) to water can be reduced and the working effect of the gas classification and discharge device (120) can be improved.

[0030] In this embodiment, the gas classification and exhaust device (120) is integrally molded. The integral molding design improves the structural strength of the gas classification and exhaust device (120), ensures structural stability, reduces the risk of damage due to accidents of the gas classification and exhaust device (120), and extends the service life.

[0031] For example, a connection area (the entire inner surface (123) is a connection area) is provided on the inner surface (123), and the gas classification and discharge device is connected to an external facility in the connection area. Through the above limitation, the outer protruding flow guide structure of the tail portion of the gas classification and discharge device (120) is fixed to the surface of the bottom plate of the ship body (100), which helps to position the gas classification and discharge device (120) at the tail end of the bottom plate of the ship body (100), and also ensures that the gas classification and discharge device (120) is positioned symmetrically with respect to the cross section (140), thereby ensuring that the gas classification and discharge device (120) is positioned downstream of the air cavity skirt plate (110) located on both sides of the bottom of the air layer resistance reduction system, thereby enabling smooth installation of the gas classification and discharge device (120) in the air layer resistance reduction ship.

[0032] In this embodiment, the thickness of the gas classification and discharge device (120) is a, and the thickness of the air cavity skirt plate (110) is b, with b ≤ a ≤ 1.5b. Through the above limitation, an optimized design for the thickness of the gas classification and discharge device (120) and the thickness of the air cavity skirt plate (110) is implemented. Considering that if a is too small, the classification and guiding action for the gas is not distinct, and if a is too large, the ship resistance increases, b ≤ a ≤ 1.5b is a desirable value range.

[0033] In one or more embodiments, in the second direction, the distance between the gas classification and discharge device (120) and the air cavity skirt plate (110) is c, 2b ≤ c ≤ 5b, and the second direction is the longitudinal direction of the ship body (100). Through the above limitation, an optimized design for the distance between the gas classification and discharge device (120) and the air cavity skirt plate (110) is implemented. Considering that if c is excessively large, it may affect the resistance reduction effect on the upstream air layer, and if c is excessively small, it may hinder gas discharge to both sides, 2b ≤ c ≤ 5b is a preferred value range.

[0034] In this embodiment, in the third direction, the width of the gas classification and discharge device (120) is d, and the distance between the ends of the two air cavity skirt plates (110) is e, 0.9e ≤ d ≤ 1.1e, and the third direction is the width direction of the ship body (100). Through the above limitation, an optimized design for the length of the gas classification and discharge device (120) and the distance between the ends of the two air cavity skirt plates (110) is implemented. If d is too small, there is a possibility that the gas after classification will still enter the propeller operating area, and if d is too large, the ship resistance will increase, so 0.9e ≤ d ≤ 1.1e is a relatively desirable value range. Explanation of the symbols

[0035] 100, ship body; 110, air cavity skirt plate; 120, gas classification and discharge device; 121, end face; 122, first section; 123, inner face; 124, outer face; 125, transition straight side; 126, transition arc side; 127, highest point; 130, propeller; 140, section.

Claims

Claim 1 In a gas classification and discharge device, the gas classification and discharge device is configured to be surrounded by an inner surface (123), an outer surface (124), and two end surfaces (121), wherein the two end surfaces (121) are arranged to face each other in a first direction, and the inner surface (123) and the outer surface (124) are arranged to face each other; the outer surface (124) is a smooth curved surface that is convex outward, and the inner surface (123) is a flat surface; The space between the inner surface (123) and the outer surface (124) is transitioned through a symmetrical transition straight side (125), one end surface (121), a transition arc side (126), and another end surface (121), the transition straight side (125) extends along the first direction, and in the first direction, the transition arc side (126) moves away from the transition straight side (125) first and then moves closer; as it goes from one end surface (121) to another end surface (121) along the first direction, the projection of the gas classification and discharge device in a plane perpendicular to the first direction is first enlarged and then reduced again, and the projection shape does not change; the gas classification and discharge device is arranged symmetrically with respect to the first cross section (122), the first cross section (122) is the central longitudinal cross section of the gas classification and discharge device and is perpendicular to the first direction. Claim 2 In claim 1, the projection of the gas classification and discharge device in a plane perpendicular to the first direction is a half-droplet shape. Claim 3 In claim 2, the point furthest from the projection line of the inner surface (123) in the projection curve of the outer surface (124) in the plane perpendicular to the first direction is defined as the highest point (127), and the distance between the highest point (127) and the projection point of the transition arc side (126) is smaller than the distance between the highest point (127) and the projection point of the transition straight side (125) gas classification and discharge device. Claim 4 In claim 1, the gas classification and discharge device is a gas classification and discharge device configured such that a three-dimensional smooth curved surface extends to a predetermined thickness. Claim 5 In claim 1, the gas classification and discharge device is a gas classification and discharge device that is integrally molded. Claim 6 In any one of claims 1 to 5, a connection area is provided in the inner surface (123), and the gas classification and discharge device is connected to an external facility in the connection area. Claim 7 An air layer resistance reduction vessel comprising a ship body (100) and a propeller (130) mounted on the ship body (100), a gas classification and discharge device according to any one of claims 1 to 6, and two air cavity skirt plates (110), wherein the two air cavity skirt plates (110) are arranged symmetrically with respect to a cross section (140), and the propeller (130) and the gas classification and discharge device are arranged symmetrically with respect to the cross section (140), wherein the cross section (140) is a central longitudinal section of the ship body (100), and the projections of the air cavity skirt plates (110), the gas classification and discharge device, and the propeller (130) in the central longitudinal section are arranged sequentially spaced apart along the direction from the bow of the ship body (100) to the stern of the ship body (100). Claim 8 In claim 7, the thickness of the gas classification and discharge device is a, the thickness of the air cavity skirt plate (110) is b, and b≤a≤1.5b, an air layer resistance reduction vessel. Claim 9 In claim 8, in the first direction, the distance between the gas classification and discharge device and the air cavity skirt plate (110) is c, 2b≤c≤5b, and the first direction is the longitudinal direction of the ship body (100), an air layer resistance reduction ship. Claim 10 In claim 7, in the second direction, the width of the gas classification and discharge device is d, and the distance between the ends of the two air cavity skirt plates (110) is e, 0.9e≤d≤1.1e, and the second direction is the width direction of the ship body (100), an air layer resistance reduction ship.

Images