A wind-assisted rotor aerodynamic characteristics experimental device

Abstract

The present invention belongs to the field of fluid mechanics experimental technology, and specifically relates to an experimental device for the aerodynamic characteristics of a wind-assisted rotor. The present invention can simulate the deck pitch, roll, heave and other motion states by controlling the hydraulic rod, and can accurately measure the time history curves of the resistance and lift of the rotor under the action of the lateral wind force. The present invention can automatically adjust the speed and direction of the rotor. Through the coupling on the rotating shaft, different forms of rotors including changing the aspect ratio, disc diameter ratio or surface roughness can be replaced according to experimental requirements to conduct a series of experimental comparative studies. The present invention uses a set of experimental equipment to complete the study of the aerodynamic characteristics of the booster rotor in the ship's swaying motion environment, providing an experimental basis for later actual sea area tests, greatly reducing the experimental cost, simple operation, and has the advantages of comprehensiveness and economy, and has broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid mechanics experiments, and in particular relates to an experimental device for aerodynamic characteristics of a wind-assisted rotor. Background Art

[0002] As the energy and environmental issues facing mankind become increasingly prominent, the use of wind power to propel ships has regained attention. Wind-assisted propulsion rotors are one of the innovative energy-saving technologies with significant energy-saving effects, high feasibility, and strong application prospects. They are currently one of the most effective technical means to meet the three-stage requirements of the Ship Design Energy Efficiency Index (EEDI). Its working principle is based on the Magnus effect: a rotating cylinder will be subjected to a lateral force perpendicular to the flow direction under the action of the incoming flow. By installing a wind-assisted propulsion rotor on board, the rotor is driven to rotate in the wind to generate a force perpendicular to the wind speed direction, thereby providing the ship with a forward-assisting force.

[0003] In recent years, people have studied the aerodynamic characteristics of wind-assisted propulsion rotors mainly through numerical calculations and real sea tests on 100-ton ships. Although real sea tests are the most realistic experimental method, they are costly and difficult to implement, especially the uncontrollable severe sea conditions, which cause certain damage to the experiment. Therefore, it is particularly important to conduct aerodynamic characteristic experiments on wind-assisted propulsion rotors under simulated sea conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a wind-assisted rotor aerodynamic characteristics experimental device.

[0005] The object of the present invention is achieved through the following technical scheme: it includes a motion platform 1 and a rotor 5; a servo motor 2 is installed in the center of the bottom surface of the motion platform 1, and hydraulic telescopic rods are provided at the four corners of the bottom surface of the motion platform 1. The pitch, roll and heave motion states of the deck are simulated by controlling the length of the hydraulic telescopic rods, and a measuring device 3 is installed on the top surface of the motion platform 1; the measuring device 3 includes a bearing and a pressure sensor 7; the bearing is installed in the center of the top surface of the motion platform 1 through a fixed disc support 6; the bearing includes an inner ring 9 and an outer ring 11, and a cylindrical rolling body 10 is arranged between the inner ring 9 and the outer ring 11; there are four groups of pressure sensors 7, and the four groups of pressure sensors 7 are arranged around the outer ring 11 of the bearing and connected thereto, and the positions of adjacent pressure sensors 7 are spaced 90° apart, and the sensing part of the pressure sensor 7 is an arc groove type; the output end of the servo motor 2 is connected to the transmission shaft 8, and the transmission shaft passes through the motion platform 1 and cooperates with the inner ring 9 of the bearing; the rotor 5 is connected to the upper end of the transmission shaft 8 through a coupling 4.

[0006] The beneficial effects of the present invention are:

[0007] The present invention can simulate the deck pitch, roll, heave and other motion states by controlling the hydraulic rod, and can accurately measure the time history curves of the resistance and lift of the rotor under the action of lateral wind force. The present invention can automatically adjust the speed and direction of the rotor. Through the coupling on the rotating shaft, different forms of rotors including changing the aspect ratio, disc diameter ratio or surface roughness can be replaced according to experimental requirements to conduct a series of experimental comparative studies. The present invention uses a set of experimental equipment to complete the study of the aerodynamic characteristics of the booster rotor in the ship's swaying motion environment, providing an experimental basis for later actual sea area tests, greatly reducing the experimental cost, simple operation, and having the advantages of comprehensiveness and economy, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is the overall layout diagram of the present invention.

[0009] FIG. 2( a ) is a state diagram of the motion platform simulating pitch motion in the present invention.

[0010] FIG. 2( b ) is a state diagram of the motion platform simulating the rolling motion in the present invention.

[0011] FIG. 2( c ) is a state diagram of the motion platform simulating heave motion in the present invention.

[0012] Figure 3 Schematic diagram of the measuring device in the present invention.

[0013] Figure 4 It is a schematic diagram of the pressure sensor in the present invention.

[0014] Figure 5 It is a schematic diagram of the bearing in the present invention.

[0015] FIG6( a ) is a force diagram of a wind-assisted rotor subjected to lateral force (front view).

[0016] FIG6( b ) is a force diagram of the wind-assisted rotor when subjected to lateral force (top view). DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings.

[0018] The present invention belongs to the field of fluid mechanics experimental technology, and specifically relates to an experimental device for the aerodynamic characteristics of a wind-assisted rotor. The experimental device mainly includes a motion platform, a servo motor, a measuring device, a coupling, and a rotor system. The motion platform can simulate the motion states of the deck such as pitch, roll, and heave by controlling the hydraulic rod. The servo motor is installed under the motion platform and is connected to the measuring device, the coupling, and the rotor system in sequence. The present invention can accurately measure the time history curve of the resistance and lift of the rotor under the action of the lateral wind force; the speed and direction of the rotor can be automatically adjusted; through the coupling on the rotating shaft, different forms of rotors including changing the aspect ratio, disc diameter ratio, or surface roughness can be replaced according to the experimental requirements to carry out a series of experimental comparative studies; the present invention uses a set of experimental devices to complete the aerodynamic characteristics study of the booster rotor in the ship's swaying motion environment, provides an experimental basis for later real sea area tests, greatly reduces the experimental cost, is simple to operate, has the advantages of comprehensiveness and economy, and has broad application prospects.

[0019] A wind-assisted rotor aerodynamic characteristics experimental device comprises a motion platform 1 and a rotor 5; a servo motor 2 is installed at the center of the bottom surface of the motion platform 1, hydraulic telescopic rods are provided at the four corners of the bottom surface of the motion platform 1, and the pitch, roll and heave motion states of the deck are simulated by controlling the length of the hydraulic telescopic rods, and a measuring device 3 is installed on the top surface of the motion platform 1; the measuring device 3 comprises a bearing and a pressure sensor 7; the bearing is installed at the center of the top surface of the motion platform 1 through a fixed disc support 6; the bearing comprises an inner ring 9 and an outer ring 11, and a cylindrical rolling body 10 is arranged between the inner ring 9 and the outer ring 11; there are four groups of pressure sensors 7, and the four groups of pressure sensors 7 are arranged around the outer ring 11 of the bearing and connected thereto, the positions of adjacent pressure sensors 7 are spaced 90 degrees apart, and the sensing part of the pressure sensor 7 is an arc groove type; the output end of the servo motor 2 is connected to the transmission shaft 8, and the transmission shaft passes through the motion platform 1 and cooperates with the inner ring 9 of the bearing; the rotor 5 is connected to the upper end of the transmission shaft 8 through a coupling 4.

[0020] The invention is beneficial in that:

[0021] The present invention can simulate the deck pitch, roll, heave and other motion states by controlling the hydraulic rod; the servo motor is installed under the motion platform, and is connected to the measuring device, the coupling and the rotor system in sequence, so as to accurately measure the time history curve of the resistance and lift of the rotor under the action of the lateral wind force; the rotation speed and direction of the rotor can be automatically adjusted; through the coupling on the rotating shaft, different forms of rotors including changing the aspect ratio, disc diameter ratio or surface roughness can be replaced according to experimental requirements to carry out a series of experimental comparative studies; the present invention uses a set of experimental equipment to complete the study of the aerodynamic characteristics of the booster rotor in the ship's swaying motion environment, provides an experimental basis for later actual sea area tests, greatly reduces the experimental cost, is simple to operate, has the advantages of comprehensiveness and economy, and has broad application prospects.

[0022] Embodiment 1:

[0023] The present invention completes the study on the aerodynamic characteristics of the booster rotor in the ship's swaying motion environment by simulating the deck's pitch, roll, heave and other motion states and the sea conditions of lateral wind. It can be regarded as an experimental technology between numerical calculation and actual sea area testing, which provides an experimental basis for later actual sea area testing, greatly reduces the experimental cost, and has a good practical application prospect.

[0024] A wind-assisted rotor aerodynamic characteristics experimental device comprises a motion platform 1, a servo motor 2, a measuring device 3, a coupling 4 and a rotor 5. The motion platform 1 can simulate the motion states of the deck such as pitch, roll, heave and the like by controlling a hydraulic rod. The servo motor 2 is installed below the motion platform and is sequentially connected to the measuring device 3, the coupling 4 and the rotor 5 to complete the study of the aerodynamic characteristics of the rotor under the ship's swaying motion environment.

[0025] The motion platform 1 meets the motion state output required by the test through the lifting and lowering coordination of four hydraulic rods. The heave amplitude range is 0-0.1m, the roll angle range is 0-25° and the pitch angle range is 0-10°, so that the motion platform can simulate the swaying motion of a ship in the ocean.

[0026] The servo motor 2 is installed below the motion platform and transmits the uniform rotation to the booster rotor through the measuring device and the coupling.

[0027] The measuring device 3 includes components such as a bearing, a pressure sensor, and a fixed disc support. The bearing and the rotating shaft are transitionally matched, and the pressure sensor and the fixed disc support are sequentially connected from the inside to the outside.

[0028] There are four pressure sensors, which are arranged around the bearing and connected thereto, and the interval between adjacent sensor positions is 90°. The sensing part of the pressure sensor is an arc groove type.

[0029] The bearing comprises an inner ring, a rolling element, an outer ring, and a seal, wherein the rolling element is in the shape of a cylinder.

[0030] As attached Figure 1 As shown, it is the overall layout diagram of the present invention; a wind-assisted rotor aerodynamic characteristics experimental device, including a motion platform 1, a servo motor 2, a measuring device 3, a coupling 4 and a rotor 5. When the experimental device is working, the motion platform 1 can simulate the deck pitch, roll, heave and other motion states by controlling the hydraulic rod. The servo motor 2 is installed under the motion platform, and is sequentially connected to the measuring device 3 and the coupling 4 and transmits the rotation speed to the rotor 5, driving the rotor 5 to rotate in the crosswind to generate a force perpendicular to the wind speed direction, and the measuring device 3 obtains the measurement data. According to the experimental requirements, different rotors can be replaced by the coupling 4, and the servo motor 2 can be changed to automatically adjust the rotation speed and direction of the rotor, thereby completing the aerodynamic characteristics study of the rotor in the ship's swaying motion environment.

[0031] As shown in Figure 2(a), it is a state diagram of the pitch motion of the motion platform, which simulates the pitch motion of the deck by simultaneously controlling the up and down motion of the front and rear hydraulic rods, and the pitch angle range is 0 to 10°; as shown in Figure 2(b), it is a state diagram of the roll motion of the motion platform, which simulates the roll motion of the deck by simultaneously controlling the up and down motion of the left and right hydraulic rods, and the roll angle range is 0 to 25°; as shown in Figure 2(c), it is a state diagram of the heave motion of the motion platform, which simulates the heave motion of the deck by simultaneously controlling the up and down motion of all hydraulic rods, and the heave amplitude range is 0 to 0.1m.

[0032] As attached Figure 3 As shown in FIG. 1 , it is the overall layout diagram of the measuring device, including the transmission shaft 8, the inner ring 9, the rolling element 10, the outer ring 11, the pressure sensor 7, the fixed disc support 6 and other components; as shown in FIG. Figure 4 As shown in the figure, it is a three-dimensional diagram of the pressure sensor. The force-bearing part is an arc groove type. This design is to ensure that it is closely connected with the outer ring, increasing its load and strength in the device. Figure 5 The figure shows a three-dimensional diagram of a transmission bearing, which includes an inner ring, rolling elements, an outer ring, and a seal. The rolling elements are cylindrical. This design is to ensure the force transmission performance by evenly distributing the load, reduce the wear of components, and increase the service life.

[0033] As shown in Figures 6(a) and 6(b), which are force analysis diagrams of the experimental device, when the device is working, the rotating cylinder will be subjected to lateral lift perpendicular to the flow direction and resistance in the flow direction under the action of the lateral flow, wherein the lateral force provides a propulsion force for the ship to move forward. When the cylinder is subjected to a uniformly distributed load in a certain direction, it can be simplified as a cantilever beam subjected to a uniformly distributed load q, one end of the cantilever beam is a fixed support, i.e., a measuring device, and the other end is a free end. Under the action of the load, it can be known from the force balance condition that the support reaction force F=qL at the fixed end of the cantilever beam, so the force measured by the measuring device is the support reaction force F, i.e., the lateral lift perpendicular to the flow direction or the resistance in the flow direction.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind-assisted rotor aerodynamic characteristics experimental device, characterized by: The invention comprises a motion platform (1) and a rotor (5); a servo motor (2) is installed at the center of the bottom surface of the motion platform (1); hydraulic telescopic rods are provided at the four corners of the bottom surface of the motion platform (1); the pitch, roll and heave motion of the deck are simulated by controlling the length of the hydraulic telescopic rods; a measuring device (3) is installed on the top surface of the motion platform (1); the measuring device (3) comprises a bearing and a pressure sensor (7); the bearing is installed at the center of the top surface of the motion platform (1) through a fixed disc support (6); the bearing comprises an inner ring (9) and an outer ring (11); the inner ring ( 9) and an outer ring (11) are arranged with a cylindrical rolling body (10); the pressure sensors (7) are arranged in four groups, and the four groups of pressure sensors (7) are arranged around the outer ring (11) of the bearing and connected thereto, and the position intervals of adjacent pressure sensors (7) are 90°, and the sensing parts of the pressure sensors (7) are arc groove-shaped; the output end of the servo motor (2) is connected to the transmission shaft (8), and the transmission shaft passes through the motion platform (1) and cooperates with the inner ring (9) of the bearing; the rotor (5) is connected to the upper end of the transmission shaft (8) through a coupling (4); When working, the motion platform (1) simulates the pitch, roll and heave motion of the deck by controlling the length of the hydraulic telescopic rod, and the servo motor (2) drives the rotor (5) to rotate in the transverse wind, generating a force perpendicular to the wind speed direction, and the measurement data is obtained by the measuring device (3); according to the experimental requirements, different rotors are replaced through the coupling (4), and the rotation speed and direction of the rotor (5) are adjusted by the servo motor (2), thereby completing the study of the aerodynamic characteristics of the rotor in the ship's swaying motion environment.

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