Wind tunnel testing apparatus for repeatedly measuring the adhesion of ice layers to object surfaces.

Abstract

This invention discloses a wind tunnel testing device for repeatedly measuring the adhesion force of ice layers on an object surface. The device includes left and right support pillars and connected fixed plates, telescopic rods and their driving and fixing devices, a rotating table, a connecting plate for connecting the rotating table and an outer cylinder, a rotating outer cylinder, and micro-holes. The outer cylinder contains, from top to bottom, a sensor, a connecting rod, an inner disk, an actuator, and the bottom surface of the disk. Three inner disks are distributed from top to bottom. Each actuator is located below a corresponding inner disk, and the distance between each actuator and the inner disk is adjustable, thus ensuring multiple sequential measurements from bottom to top. The disks are semi-hollow to reduce the original load under no-load conditions. During implementation, the device of this invention, due to the small direct force-bearing area of ​​the ice layer, will not cause damage to the ice layer. Furthermore, it can be easily placed in an icing wind tunnel and can perform multiple measurements after a single icing event, thereby obtaining more realistic and accurate ice adhesion force data.

Description

Technical Field

[0001] This invention relates to the field of mechanical measurement, and in particular to a device and testing method for repeatedly measuring the adhesion force of ice layers on the surface of an object. Background Technology

[0002] The hazards caused by icing on object surfaces have existed in many industries. For example, icing on aircraft can affect flight safety, and severe icing on power transmission lines can cause towers to collapse. To reduce the adverse effects of icing, various de-icing technologies have been developed. The key to removing ice is to break the adhesion between the ice layer and the object's surface. Therefore, measuring the adhesion of ice to an object's surface is very important.

[0003] Currently, the main methods used to measure adhesion force are the direct pull-out method and the cylindrical sleeve method. Both of these methods directly apply tensile force to a large area of ​​ice, making measurement control difficult and prone to causing internal cracking of the ice layer during the pull-out process, thus introducing significant errors in the measurement results. Furthermore, the randomness of icing also increases the random error in the measurement.

[0004] Therefore, in order to obtain more accurate data on ice adhesion force, it is of great significance to develop a simple and effective device for measuring the ice adhesion force on object surfaces. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a device and testing method for simultaneously measuring the adhesion force of ice layers on the surface of an object multiple times. This device is easy to install and operate, and using this testing method, several sets of relatively reliable ice adhesion force data can be easily obtained in a single experiment.

[0006] The technical solution of the device adopted by the present invention to solve the above problems is as follows:

[0007] A wind tunnel testing device for repeatedly measuring the adhesion force of ice layers on the surface of an object includes left and right pillars and a fixed plate connected thereto, a telescopic rod and its driving device and fixing device, a rotating table, a connecting plate for connecting the rotating table and an outer cylinder, and a rotating outer cylinder; the surface of the rotating outer cylinder has 3 sets of microholes; the interior of the outer cylinder, from top to bottom, includes a sensor, a connecting rod, an inner disk, an actuating block and a bottom surface of the disk, and there are six columns on the bottom surface of the disk;

[0008] A telescopic rod is located in the middle of the fixed plate. The telescopic rod is connected to the fixed plate by a fixing device. A rotating platform and a connecting plate are installed below the fixed plate. A rotating outer cylinder is installed below the connecting plate.

[0009] Furthermore, the outer surface of the inner disk is in close contact with the inner surface of the outer cylinder.

[0010] Furthermore, the three sets of micropores on the surface of the rotating outer cylinder, each set containing two micropores, are symmetrically distributed to ensure load balance during force measurement.

[0011] Furthermore, there are three inner disks distributed from top to bottom, and the position of each inner disk corresponds to the position of the micropore.

[0012] Furthermore, each actuator is located below the corresponding inner disk, and the distance between each actuator and the inner disk is adjustable, thereby ensuring multiple sequential measurements from bottom to top.

[0013] Furthermore, the inner disk has a circular hole at its center, the size of which is slightly larger than the diameter of the connecting rod; the inside of the disk is semi-hollow to reduce the original load when unloaded.

[0014] Furthermore, the discs are simply placed directly on the bottom of the cylinder or on the column, making them easy to disassemble; the discs can be made of different materials or materials with different surface roughness to measure the adhesion of ice layers on different surfaces.

[0015] The beneficial effects of this invention are: 1) The micropores of this invention are very small, resulting in a small direct force-bearing area for the ice layer, preventing internal fracture of the ice layer during testing, and obtaining more accurate ice adhesion force data; 2) Each group of micropores in this invention contains two symmetrically distributed holes, and the discs and actuators are all symmetrically shaped, ensuring load balance during force measurement; 3) This invention includes three from top to bottom, with each inner disc corresponding to a micropore position, and each actuator located below the corresponding inner disc, with adjustable distances to the inner discs, thus ensuring three sequential measurements from bottom to top, improving measurement efficiency and reducing measurement errors; 4) The discs of this invention can be made of various materials or surfaces with different roughnesses as needed, thus facilitating the acquisition of ice adhesion force data for different substrates; 5) This invention can be directly installed in an icing wind tunnel for measurement, obtaining more accurate ice adhesion force data, thus providing a reference for aircraft surface de-icing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the device for simultaneously measuring the adhesion force of ice layers on the surface of an object multiple times in this invention;

[0017] Figure 2 This is a partial schematic diagram of the device for simultaneously measuring the adhesion force of ice layers on the surface of an object multiple times in this invention;

[0018] Figure 3 This is a partial front cross-sectional view of the device for simultaneously measuring the adhesion force of ice layers on the surface of an object multiple times in this invention;

[0019] In the figure, 1-support column, 2-fixed plate, 3-telescopic rod, 31-telescopic rod drive device, 32-telescopic rod fixing device, 4-rotating table, 5-connecting plate, 6-rotating outer cylinder, 61-microhole, 7-sensor, 8-connecting rod, 9-inner disc, 10-actuator, 11-bottom surface of disc, 111-column. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings:

[0021] This invention discloses a device for repeatedly measuring the adhesion force of ice layers on the surface of an object. To make the essential features and practicality of this invention easier to understand, the technical solution of this invention is further described in detail below with reference to the accompanying drawings and several embodiments. However, the following description and explanation of the embodiments do not constitute any limitation on the scope of protection of this invention.

[0022] The wind tunnel testing device disclosed in this application for repeatedly measuring the adhesion force of ice layer on the surface of an object includes left and right pillars and a fixed plate connected thereto, a telescopic rod and its driving device and fixing device, a rotating table, a connecting plate for connecting the rotating table and the outer cylinder, and a rotating outer cylinder; the surface of the rotating outer cylinder has 3 sets of microholes; the interior of the outer cylinder from top to bottom includes a sensor, a connecting rod, an inner disk, an actuator and a bottom surface of the disk, and there are six columns on the bottom surface of the disk;

[0023] A telescopic rod is located in the middle of the fixed plate. The telescopic rod is connected to the fixed plate by a fixing device. A rotating platform and a connecting plate are installed below the fixed plate. A rotating outer cylinder is installed below the connecting plate. The outer surface of the inner disc is in close contact with the inner surface of the outer cylinder. Three sets of microholes, each set containing two microholes, are symmetrically distributed on the surface of the rotating outer cylinder to ensure load balance during force measurement.

[0024] Furthermore, there are three inner disks distributed from top to bottom, each corresponding to a micro-hole. Each inner disk has a central hole slightly larger than the diameter of the connecting rod; the disks are semi-hollow inside to reduce the original load under no-load conditions.

[0025] Furthermore, each actuator is located below its corresponding inner disk, and the distance between the actuator and the inner disk is adjustable, thus ensuring multiple sequential measurements from bottom to top. The disks are simply placed directly on the bottom surface of the cylinder or on the column for easy disassembly; the disks can be made of different materials or materials with different surface roughness to measure the ice adhesion force on different surfaces.

[0026] Please see Figure 1The image shows an embodiment of the present invention, a device for measuring the adhesion force of surface ice in an icing wind tunnel. It includes a support column 1, a fixing plate 2, a telescopic rod 3, a rotating platform 4, a connecting plate 5, a rotating outer cylinder 6, a sensor 7, a connecting rod 8, an inner disk 9, an actuating mechanism 10, and a bottom surface 11 of the disk. The telescopic rod is driven by its driving device 31 and connected to the fixing plate 2 via a fixing device 32 to ensure the telescopic rod is fixed during operation.

[0027] The rotating outer cylinder has three sets of micro-holes 6 from top to bottom, each set containing two symmetrically distributed micro-holes. The bottom surface 11 of the disc is fixed to the rotating outer cylinder, and has six uprights 111 on it, with three uprights of equal height, used to support the inner disc 9, allowing the inner disc to rotate together with the rotating outer cylinder 6. The inner disc has a semi-hollow structure, with grooves on its lower surface. Its outer surface can be made of different materials or materials with different surface roughness to measure the ice adhesion force on different surfaces. After each test, a different type of inner disc 9 can be placed on the uprights 111 for the next test.

[0028] Before measurement begins, install and secure the left and right support pillars and the fixing plate. Install the telescopic rod and its drive mechanism onto the fixing plate. Then, install the rotary table and connecting plate below the fixing plate. Connect the sensor and connecting rod below the telescopic rod. Screw the actuators onto the connecting rod using threads. Place the inner disc on the column. Finally, fix the rotating outer cylinder and the inner disc together onto the connecting plate. Adjust the distance between the actuators and the inner disc so that the distance between the three sets of actuators and the inner disc increases sequentially from bottom to top. After all the devices are installed and fixed, the rotary table is started, driving the connecting plate, rotating outer cylinder, and inner disk to rotate together. Then, the wind tunnel's spray system (icing system) is turned on, causing ice to form evenly on the surface of the rotating outer cylinder and the surface of the inner disk where the micropores are located. After icing is complete, the rotary table is turned off and rotation stops. The telescopic rod drive device is started, causing the telescopic rod to retract upwards, which in turn causes the sensor, connecting rod, and actuator to retract upwards as well. After the actuator contacts the inner disk, it pushes the inner disk to gradually separate from the ice layer on it (i.e., the ice layer at the micropores of the rotating outer cylinder). During the separation process, the reading of the force sensor gradually increases. When the inner disk separates from the ice layer, the sensor reading is at its maximum. This value is the magnitude of the adhesion force between the ice layer and the surface of the inner disk. After saving this set of data, the telescopic rod is driven to retract again, thereby causing the second and third sets of actuators to act on the inner disk in turn. The adhesion force between the surfaces of the latter two inner disks and the ice layer is measured in the same way, realizing multiple adhesion force measurements after one icing. After the measurement is completed, different types of discs can be used to obtain ice adhesion data for different materials or the same material with different surface roughness.

[0029] Furthermore, there are many specific methods and approaches to implement this invention, and the above description is only a preferred embodiment of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object, characterized in that, It includes left and right pillars and a fixed plate connected thereto, a telescopic rod and its driving device and fixing device, a rotating platform, a connecting plate for connecting the rotating platform and the rotating outer cylinder, and the rotating outer cylinder; wherein, the surface of the rotating outer cylinder has several sets of micro holes, and the interior of the rotating outer cylinder from top to bottom includes a sensor, a connecting rod, an inner disk, an actuating block and a disk bottom surface, and a column is provided on the disk bottom surface; A telescopic rod is located in the middle of the fixed plate. The telescopic rod is connected to the fixed plate by a fixing device. A rotating platform and a connecting plate are installed below the fixed plate. A rotating outer cylinder is installed below the connecting plate. The bottom of the disc is fixed to the rotating outer cylinder. There are 6 pillars on the bottom of the disc, with three pillars of the same height supporting the inner disc so that the inner disc can rotate together with the rotating outer cylinder. The rotating table is started, which drives the connecting plate, the rotating outer cylinder, and the inner disc to rotate together. The spray system of the wind tunnel is turned on, so that the ice layer freezes evenly on the surface of the rotating outer cylinder and the surface of the inner disc where the micropores are located.

2. The wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object according to claim 1, characterized in that: The outer surface of the inner disk is in close contact with the inner surface of the rotating outer cylinder.

3. The wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object according to claim 1, characterized in that: The three sets of microholes on the surface of the rotating outer cylinder, each set containing two microholes, are symmetrically distributed to ensure load balance during force measurement.

4. The wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object according to claim 3, characterized in that: There are three inner disks distributed from top to bottom, and the position of each inner disk corresponds to the position of the micropore. The lower end of the column is fixed to the bottom surface of the disc, and the upper end supports the inner disc.

5. The wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object according to any one of claims 1 to 4, characterized in that: Each actuator is located below the corresponding inner disk, and the distance between it and the inner disk is adjustable.

6. The wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object according to claim 1, characterized in that: The inner disk has a circular hole at its center, the size of which is slightly larger than the diameter of the connecting rod; the inside of the disk is a semi-hollow structure.

7. The wind tunnel testing apparatus for repeatedly measuring the adhesion force of ice layers on the surface of an object according to claim 1, characterized in that: The inner disks are simply placed directly on the bottom surface of the cylinder or on the column; the inner disks are made of different materials or materials with different surface roughness to measure the adhesion force of ice layers on different surfaces.

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