Novel rigid airfoil sail having airflow suction function

Abstract

A novel rigid airfoil sail having an airflow suction function, the novel rigid airfoil sail comprising a sail body (100); the upper end face of the sail body (100), which is a tubular component, is provided with an end plate (1). Of the side wall of the sail body (100), one side is a sail body protruding face (101) while the other side is a sail body recessed face (102), the sail body protruding face (101) being provided with air suction holes (3), and the end plate (1) being provided with air discharge holes (5). Airflow entering through the air suction holes (3) is discharged through the air discharge holes (5). The air suction holes (3) are arranged at intervals in the horizontal and vertical directions of the sail body recessed face (102). The rigid airfoil sail having an airflow suction function has a simple structure, and the ‌thrust performance of the rigid airfoil sail can be significantly improved, thereby greatly improving energy efficiency.

Description

Novel hard wing sail with air flow suction function TECHNICAL FIELD

[0001] The present application belongs to the field of hard wing sail, and relates to a novel hard wing sail with air flow suction function. BACKGROUND

[0002] At present, the ship boosting device represented by the hard wing sail has a significantly different working principle from traditional resistance sails, sky sails and spin cylinder sails because the wing profile of the hard wing sail is similar to the wing of an airplane. According to Bernoulli's principle, the pressure drop caused by high-speed airflow, the airflow speed on the convex surface of the wing sail is fast, the airflow speed on the concave surface is slow, and the pressure difference is caused by the speed difference of the airflow on both sides of the convex surface and the concave surface, thereby generating lift. The lift and drag generated by air power constitute the propelling force of the sail in the sailing direction. The wing sail is widely used in the field of ship boosting, and the wind wing developed by the COSCO Group, the Kai Lili sail installed by the Dalian Shipbuilding Industry Group and the wind challenger developed by the MOL and Oshima Shipbuilding are all hard wing sails.

[0003] As can be seen from the Bernoulli principle used by the hard wing sail, the hard wing sail belongs to passive wind resistance. It basically divides the external wind energy through its special wing profile, converts the wind energy into the lift of the sail through the pressure difference caused by the speed difference of the airflow on both sides of the sail, and further converts it into the propelling power of the ship.

[0004] The hard wing sail of the prior art only converts external wind energy into thrust. Since the forward direction of the ship, the running speed of the ship and the absolute direction and speed of the external wind field may have a reverse reduction vector relationship, there is a great energy loss in the process, resulting in unsatisfactory thrust effect of the hard wing sail, thereby greatly reducing the energy saving efficiency of the hard wing sail, and prolonging the return on investment of the hard wing sail.

[0005] SUMMARY

[0006] The present application is to solve the problems of low thrust effect and low energy saving efficiency of the hard wing sail of the prior art, and provides a novel hard wing sail with air flow suction function, which is characterized by comprising a sail body, the sail body being a cylindrical component, an end plate being arranged on the upper end surface of the sail body cylindrical component, the side wall of the sail body being one convex surface and one concave surface, the speed difference of the airflow flowing through the convex surface and the concave surface of the sail body generating a pressure difference, air suction holes being arranged on the convex surface of the sail body to increase the airflow speed, air exhaust holes being arranged on the end plate, the airflow entering the air suction holes being exhausted from the air exhaust holes, and the air suction holes being arranged in the horizontal and vertical directions of the convex surface of the sail body.

[0007] The new hard wing sail with air flow suction function has the characteristics that the cross section of the sail body is in U wing type.

[0008] The new hard wing sail with air flow suction function has the characteristics that the air flow rising channels are arranged in the sail body and are in communication with the air suction holes and the air exhaust holes.

[0009] The new hard wing sail with air flow suction function has the characteristics that the number of the air suction holes arranged on the convex surface of the sail body is the same as the number of the air exhaust holes arranged on the concave surface of the sail body, each air suction hole is connected with an air exhaust hole through an independent air flow rising channel, and the number of the air flow rising channels is the same as the number of the air suction holes.

[0010] The new hard wing sail with air flow suction function has the characteristics that the several air suction holes arranged on the convex surface of the sail body are in communication with each other and are connected with the air exhaust hole through the independent air flow rising channel.

[0011] The new hard wing sail with air flow suction function has the characteristics that only one air exhaust hole is arranged on the end plate, and all the air suction holes are connected with the air exhaust hole through the independent air flow rising channel.

[0012] The new hard wing sail with air flow suction function has the characteristics that the air exhaust device is arranged between the air exhaust hole and the air flow rising channel, and the air exhaust device comprises an air exhaust fan.

[0013] The new hard wing sail with air flow suction function has the characteristics that the air exhaust grille is arranged on the air exhaust hole to prevent foreign matters from entering the air exhaust hole.

[0014] The new hard wing sail with air flow suction function has the characteristics that the fan equipment room is in inverted conical shape.

[0015] The new hard wing sail with air flow suction function has the characteristics that the positions and sizes of the air suction holes arranged on the convex surface of the sail body and the air exhaust holes arranged on the end plate are determined through CFD numerical simulation or wind tunnel test analysis results.

[0016] Compared with the prior art, the new hard wing sail with air flow suction function has the following advantages:

[0017] 1. The sail cross section of the application adopts a U-shaped wing type, combined with the settings of the sail end plate, the sail convex surface air suction hole, the sail internal airflow upward channel and the sail top end plate exhaust hole, utilizes the natural pressure difference, greatly accelerates the airflow speed of the sail convex surface relative to the concave surface, thereby amplifying the aerodynamic pressure difference of the convex surface and the concave surface, improving the thrust effect of the hard wing type sail, and further improving the energy saving efficiency.

[0018] 2. The sail of the application is combined with the settings of the sail end plate, the sail convex surface air suction hole, the sail internal airflow upward channel and the sail top end plate exhaust hole, and further accelerates the airflow speed of the sail convex surface relative to the concave surface through the forced suction of the wind power suction equipment arranged between the sail top exhaust hole and the airflow upward channel, thereby amplifying the aerodynamic pressure difference of the convex surface and the concave surface, significantly improving the thrust effect of the hard wing type sail, and further greatly improving the energy saving efficiency. According to the CFD analysis verification, the new hard wing type sail with airflow suction function can effectively improve the lift coefficient of the sail leaf to 6-7, which is 3-4 times that of the existing hard wing type sail.

[0019] 3. A plurality of air suction holes are arranged at different heights on the convex surface from the bottom of the wing type sail leaf to the top end plate. The arrangement information of the height of the air suction hole, the size and relative position of each air suction hole is comprehensively obtained from the CFD numerical simulation and wind tunnel test analysis results, thereby maximizing the lift improvement effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a structural schematic diagram of a new hard wing type sail with airflow suction function.

[0021] Fig. 2 is a thrust principle diagram of the existing hard wing type sail.

[0022] Fig. 3 is a thrust principle diagram of a new hard wing type sail with airflow suction function.

[0023] Fig. 4 is an axial side view of a structural schematic diagram of an embodiment one of a new hard wing type sail with airflow suction function.

[0024] Fig. 5 is a side view of a structural schematic diagram of an embodiment one of a new hard wing type sail with airflow suction function.

[0025] Fig. 6 is a front view of a structural schematic diagram of an embodiment one of a new hard wing type sail with airflow suction function.

[0026] Fig. 7 is a top view of a structural schematic diagram of an embodiment one of a new hard wing type sail with airflow suction function.

[0027] Fig. 8 is an axial side view of a structural schematic diagram of an embodiment two of a new hard wing type sail with airflow suction function.

[0028] Figure 9 is a schematic diagram of the structure of the third embodiment of the new hard wing sail with air flow suction function.

[0029] Figure 10 is a schematic diagram of the structure of the exhaust device of the new hard wing sail with air flow suction function.

[0030] Figure 11 is a schematic diagram of the structure of the first embodiment of the new hard wing sail with air flow suction function with an exhaust device.

[0031] Figure 1: end plate; 3: air suction hole; 4: air flow rising channel; 5: exhaust hole; 6: exhaust grid; 7: exhaust fan; 8: fan equipment room; 100: sail body; 101: sail body convex surface; 102: sail body concave surface; 200: exhaust device. DETAILED DESCRIPTION

[0032] Preferred embodiment one

[0033] The new hard wing sail with air flow suction function includes a sail body 100; the sail body 100 is a cylindrical component; the upper end face of the sail body 100 cylindrical component is provided with an end plate 1; the side wall of the sail body 100 is one sail body convex surface 101 and one sail body concave surface 102, and the speed difference of the air flow passing through the sail body convex surface 101 and the sail body concave surface 102 generates a pressure difference; the sail body convex surface 101 is provided with air suction holes 3 for increasing the flow speed of the air flow; the end plate 1 is provided with exhaust holes 5; the air flow entering from the air suction holes 3 is discharged from the exhaust holes 5; the air suction holes 3 are arranged in the horizontal and vertical directions along the sail body convex surface 101.

[0034] The end plate 1 separates the air flow below the end plate 1 from the air flow above the end plate 1, reduces the mutual influence between the air flow below and the discharged air flow above, and maximizes the lift enhancement effect.

[0035] The sail body 100 cross section adopts a U wing type.

[0036] The air suction holes 3 and the exhaust holes 5 are connected to each other through an air flow rising channel 4, and the air flow rising channel 4 is arranged inside the sail body 100.

[0037] As shown in Figures 4-7: at different heights from the bottom of the sail body 100 to the top end plate, a plurality of air suction holes 3 are arranged at the convex surface, and the arrangement information such as the height of the air suction holes 3, the size and relative position of each air suction hole 3 needs to be confirmed comprehensively in combination with the CFD numerical simulation or wind tunnel test analysis results.

[0038] The end plate 1 is arranged at the top of the sail body 100, and a plurality of exhaust holes 5 are arranged above the end plate 1, and the arrangement information such as the size and relative position of each exhaust hole 5 needs to be confirmed comprehensively in combination with the CFD numerical simulation or wind tunnel test analysis results.

[0039] Each air inlet hole 3 at each horizontal height is connected to a separately arranged air flow upward channel 4, the air flow upward channel 4 is arranged vertically upward, the air flow upward channel 4 is arranged inside the sail body 100, the air flow upward channel 4 is connected to the air outlet hole 5 arranged above the end plate 1, the air flow upward channels 4 of each air inlet hole 3 at each horizontal height are independent of each other.

[0040] Since the height of the sail body 100 is usually tens of meters, there is a large height difference between the air inlet hole 3 and the air outlet hole 5, and the air pressure at the air outlet hole 5 is lower than that at the air inlet hole 3. Under the action of the natural air pressure difference, the air below is sucked in through the air inlet hole 3, rises to the air outlet hole 5 through the air flow upward channel 4, and is discharged through the air outlet hole 5. This embodiment has high requirements for the size of the sail body 100, the size of the air flow upward channel 4, and the size and arrangement of the air inlet hole 3 and the air outlet hole 5. The principle is simple, no additional power consumption is required, and only the natural pressure difference between the air inlet hole 3 and the air outlet hole 5 is utilized to achieve air flow suction, thereby increasing the lift between the convex surface 101 of the sail body and the concave surface 102 of the sail body, and increasing the sail boosting effect.

[0041] Preferred embodiment two

[0042] As shown in FIG. 8: In order to improve the air flow upward effect of the air flow upward channel 4, the air inlet hole 3 distributed at each horizontal height on the sail body 100 is connected to an air flow upward channel 4 through an inclined upward air flow channel 4. The air inlet hole 3 at each horizontal height is connected to the same air flow upward channel 4, the diameter of the air flow upward channel 4 is larger than that of the air inlet hole 3, the air flow upward channels 4 connected by the air inlet holes 3 at different heights do not interfere with each other, and the air flow upward channel 4 is connected to the air outlet hole 5 at the end plate 1 to discharge the air flow. By using this air flow upward channel arrangement scheme, the diameter of the air flow upward channel 4 is larger than that of the air inlet hole 3, which can greatly reduce the upward resistance of the air flow along the air flow upward channel 3, thereby ensuring the effect of increasing the air flow velocity of the convex surface 101 of the sail body, improving the lift of the sail, and ensuring the true thrust effect of the sail. Although the specific embodiment is changed, this embodiment still has high requirements for the size of the sail body 100, the size of the air flow upward channel 4, and the size and arrangement of the air inlet hole 3 and the air outlet hole 5. The principle is simple, no additional power consumption is required, and air flow suction is still achieved by utilizing the natural pressure difference between the air inlet hole 3 and the air outlet hole 5, thereby increasing the lift between the convex surface 101 of the sail body and the concave surface 102 of the sail body, and increasing the sail boosting effect.

[0043] Preferred embodiment three

[0044] As shown in FIGS. 9-11: Each air inlet hole 3 distributed at each horizontal height on the sail body 100 is connected to an air outlet hole 5 at the end plate 1 through an inclined upward air flow upward channel 4 to discharge the air flow.

[0045] The exhaust port 5 is arranged at the end plate 1 of the sail body 100, and the conical fan equipment room 8 is arranged in the sail body 100 at the top of the airflow ascending channel 4. The fan equipment room 8 is used to place the exhaust fan 7, the exhaust fan 7 is installed in the fan equipment room 8, and is fixed in the interior of the sail body 100. The exhaust grille 6 is installed above the exhaust fan 7, and the exhaust grille 6 can hinder foreign matters from entering the exhaust fan 7, and prevent the exhaust fan 7 from being affected.

[0046] The exhaust fan 7 is opened to draw air. The airflow at different height positions enters the airflow ascending channel 4 through the air inlet hole 3, and is discharged to the upper side of the end plate 1 through the exhaust port 5. The forced suction of the airflow does not require overcoming the airflow ascending resistance, is beneficial to the design of the size and arrangement of the sail body 100, the airflow ascending channel 4, the air inlet hole 3 and the exhaust hole 5, although the exhaust fan 7 needs to consume a certain power, but can significantly improve the lift between the sail convex surface 101 and the sail concave surface 102, thereby significantly increasing the boosting effect of the sail blade.

Claims

1. A new type of hard wing sail with air flow suction function, characterized in that: The wind sail includes a sail body (100), the sail body (100) is a cylindrical component, an end plate (1) is arranged on the upper end surface of the cylindrical component of the sail body (100), the side wall of the sail body (100) is provided with a sail convex surface (101) and a sail concave surface (102), a pressure difference is generated by the speed difference of airflow flowing through the sail convex surface (101) and the sail concave surface (102), air suction holes (3) for increasing the airflow speed are arranged on the sail convex surface (101), air exhaust holes (5) are arranged on the end plate (1), the airflow entering from the air suction holes (3) is exhausted from the air exhaust holes (5), and the air suction holes (3) are arranged in the horizontal and vertical directions of the sail convex surface (101) at intervals.

2. The new hard wing sail with air flow suction function according to claim 1, characterized in that: The cross section of the sail body (100) adopts a U wing type.

3. The new hard wing sail with air flow suction function according to claim 1 or 2, characterized in that: The air suction holes (3) and the air exhaust holes (5) are connected to each other through airflow rising channels (4) arranged in the sail body (100).

4. The new hard wing sail with air flow suction function according to claim 3, characterized in that: The number of the air suction holes (3) arranged on the sail convex surface (101) is the same as the number of the air exhaust holes (5) arranged on the sail concave surface (102), each air suction hole (3) is connected to an air exhaust hole (5) through an independent airflow rising channel (4), and the number of the airflow rising channels (4) is the same as the number of the air suction holes (3).

5. The new hard wing sail with air flow suction function according to claim 3, characterized in that: The plurality of air suction holes (3) arranged on the sail convex surface (101) are connected to one air exhaust hole (5) through one independent airflow rising channel (4).

6. The new hard wing sail with air flow suction function according to claim 3, characterized in that: Only one air exhaust hole (5) is arranged on the end plate (1), and all the air suction holes (3) are connected to the air exhaust hole (5) through one independent airflow rising channel (4).

7. The new hard wing sail with air flow suction function according to any one of claims 4-6, characterized in that: An air exhaust device (200) is arranged between the air exhaust hole (5) and the airflow rising channel (4) on the end plate (1), and the air exhaust device (200) includes an air exhaust fan (7) arranged in a fan equipment room (8) connected between the air exhaust hole (5) and the airflow rising channel (4).

8. The new hard wing sail with air flow suction function according to claim 7, characterized in that: An air exhaust grille (6) is arranged on the air exhaust hole (5) to prevent foreign matters from entering the air exhaust hole (5).

9. The novel hard wing type wind sail with airflow suction function according to claim 8, characterized in that the fan equipment room (8) is a reverse cone.

10. The new hard wing sail with air flow suction function according to claim 1 or 9, characterized in that: The positions and sizes of the air suction holes (3) arranged on the sail convex surface (101) and the air exhaust holes (5) arranged on the end plate (1) are determined through CFD numerical simulation or wind tunnel test analysis results.

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