CN115290555A - Wind tunnel test device for measuring the adhesion of ice on the surface of objects for many times - Google Patents

Abstract

The invention discloses a wind tunnel test device for measuring the adhesion force of an ice layer on the surface of an object for multiple times, which comprises a left support, a right support, a fixed plate, a telescopic rod, a driving device, a fixing device, a rotating table, a connecting plate, a rotating outer cylinder and micropores, wherein the fixed plate, the telescopic rod, the driving device and the fixing device are connected with the left support and the right support; the inside from top to bottom of outer cylinder contains sensor, connecting rod, interior disc, actuates soon and the disc bottom surface, and interior disc distributes from top to bottom has three. Each actuating block is located below the corresponding inner circular disc, and the distance between the actuating block and the inner circular disc can be adjusted, so that multiple sequential measurements from bottom to top are ensured. The interior of the disc is in a semi-hollow state to reduce the original load when the disc is unloaded. The device related by the invention can not damage the inside of the ice layer because the direct force receiving area of the ice layer is small in the implementation process, and meanwhile, the device can be conveniently placed in an icing wind tunnel and can be used for measuring for many times after one-time icing, thereby obtaining more real and accurate ice layer adhesion force data.

Description

Wind tunnel test device for multiple measurements of ice adhesion on the surface of objects

technical field

The invention relates to the field of mechanical measurement, in particular to a device and a testing method for repeatedly measuring the adhesion force of an ice layer on the surface of an object.

Background technique

The hazards caused by icing on the surface of objects have always existed in many industries. For example, icing on aircraft will affect flight safety, and severe icing on power transmission lines will cause towers to collapse. In order to reduce the adverse effects of icing, various deicing technologies have emerged, and the key to making the ice layer fall off is to destroy the adhesion between the ice layer and the surface of the object. Therefore, to measure the adhesion of the ice layer on the surface of the object becomes very important.

At present, the main methods used to measure the adhesion force are the direct pull-off method and the cylindrical sleeve method. These two methods directly apply the pulling force to a large area of ice. Internal cracks occur during the process, resulting in large errors in the measurement results. At the same time, due to the randomness of icing, the random error of measurement also increases.

Therefore, in order to obtain more accurate ice adhesion data, it is of great significance to develop a simple and effective device for measuring ice adhesion on the surface of objects.

Contents of the invention

The technical problem to be solved by the present invention is to provide a device and a test method for simultaneously measuring the adhesion force of ice layers on the surface of multiple objects in view of the defects of the background technology. This device is easy to install and operate. With this test method, several sets of reliable ice adhesion data can be easily obtained in one experiment.

The technical scheme of the device adopted by the present invention to solve the above problems is:

A wind tunnel test device for repeatedly measuring the adhesion of ice layers on the surface of objects, including left and right pillars and fixed plates connected thereto, telescopic rods and their driving devices and fixing devices, a rotating table, used to connect the rotating table and The connecting plate of the outer cylinder, the rotating outer cylinder; there are 3 groups of micro holes on the surface of the rotating outer cylinder; the inside of the outer cylinder includes sensors, connecting rods, inner discs, fast moving parts and the bottom of the disc from top to bottom. There are six uprights;

In the middle of the fixed plate is a telescopic rod, the telescopic rod is connected with the fixed plate through a fixing device, a rotating table and a connecting plate are installed under the fixed plate, and a rotating outer cylinder is installed under the connecting plate.

Further, the outer surface of the inner disc is in close contact with the inner surface of the outer cylinder.

Further, 3 groups of microholes on the surface of the rotating outer cylinder, each group containing 2 microholes, are symmetrically distributed to ensure load balance during force measurement.

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

Further, each actuator is located below the corresponding inner disk, and the distance from the inner disk can be adjusted, thereby ensuring multiple sequential measurements from bottom to top.

Further, there is a circular hole in the center of the inner disk, 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 no load is applied.

Further, the discs are directly and simply placed on the bottom surface of the cylinder or the column for easy disassembly; the discs can be made of different materials or materials with different surface roughness, so as to measure the adhesion force of the ice layer on different surfaces.

The beneficial effects of the present invention are: 1) The micropores of the present invention are very small, so that the direct stress area of the ice layer is very small, and the ice layer will not be internally broken during the test process, and the obtained ice layer adhesion data is more accurate ; 2) Each group of microholes in the present invention includes 2 symmetrically distributed holes, and the discs and fast moving parts of the present invention are all symmetrical geometry, which ensures the load balance during force measurement; 3) The present invention includes from There are three from top to bottom, the position of each inner disc corresponds to the position of the microhole, and each actuating fast is located below the corresponding inner disc, and the distance from the inner disc can be adjusted, so that It ensures three sequential measurements from bottom to top, improves measurement efficiency, and reduces measurement errors; 4) The disk of the present invention can use a variety of different materials or surfaces with different roughnesses according to needs, so that different materials can be obtained conveniently. 5) The present invention can be directly installed in an icing wind tunnel for measurement, and more accurate ice adhesion data can be obtained, thereby providing a reference for aircraft surface deicing.

Description of drawings

Fig. 1 is the schematic diagram of the device of simultaneously measuring multiple object surface ice layer adhesion among the present invention;

Fig. 2 is a partial schematic diagram of the device for simultaneously measuring the ice layer adhesion force on the surface of multiple objects in the present invention;

Fig. 3 is a partial frontal sectional view of a device for simultaneously measuring the adhesion of ice layers on the surface of multiple objects in the present invention;

In the figure, 1-pillar, 2-fixing plate, 3-telescopic rod, 31-telescopic rod driving device, 32-telescopic rod fixing device, 4-rotary table, 5-connecting plate, 6-rotating outer cylinder, 61-micro Hole, 7-sensor, 8-connecting rod, 9-inner disc, 10-fast action, 11-disk bottom surface, 111-column.

Detailed ways

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

The invention discloses a device for measuring the adhesion force of ice layers on the surface of objects multiple times. In order to make the substantive features of the invention and its practicability easier to understand, the following is a description of the invention in conjunction with the accompanying drawings. The technical scheme of the invention is further described in detail. But the following descriptions and illustrations about the embodiments do not constitute any limitation to the protection scope of the present invention.

The wind tunnel test device disclosed in the application is used to measure the adhesion force of the ice layer on the surface of the object for many times, including the left and right pillars and the fixed plates connected thereto, the telescopic rod and its driving device and fixing device, the rotary table, and the The connecting plate between the table and the outer cylinder, the rotating outer cylinder; there are 3 sets of micro holes on the surface of the rotating outer cylinder; the inside of the outer cylinder includes sensors, connecting rods, inner discs, fast moving parts and the bottom surface of the discs from top to bottom. There are six uprights on the bottom;

In the middle of the fixed plate is a telescopic rod, the telescopic rod is connected with the fixed plate through a fixing device, a rotating table and a connecting plate are installed under the fixed plate, and a rotating outer cylinder is installed under the connecting plate. The outer surface of the inner disk is in close contact with the inner surface of the outer cylinder, and the 3 groups of microholes on the surface of the rotating outer cylinder, each group contains 2 microholes, symmetrically distributed to ensure load balance during force measurement .

Further, there are three inner disks distributed from top to bottom, and the position of each inner disk corresponds to the position of the micropore. There is a circular hole in the center of the inner disk, the size of which is slightly larger than the diameter of the connecting rod; the inside of the disk is in a semi-hollow state to reduce the original load at no-load.

Further, each actuator is located below the corresponding inner disk, and the distance from the inner disk can be adjusted, thereby ensuring multiple sequential measurements from bottom to top. The discs are directly and simply placed on the bottom of the cylinder or on the column for easy disassembly; the discs can be made of different materials or materials with different surface roughness to measure the adhesion of ice layers on different surfaces.

Please refer to FIG. 1 , which is an embodiment of the present invention, which is a device for measuring surface ice adhesion in an icing wind tunnel. It includes a pillar 1, a fixed plate 2, a telescopic rod 3, a rotating table 4, a connecting plate 5, a rotating outer cylinder 6, a sensor 7, a connecting rod 8, an inner disc 9, a fast moving 10, and a disc bottom 11. Wherein, the telescopic rod is driven by its driving device 31, and is connected with the fixed plate 2 through the fixing device 32, so as to ensure the fixing of the telescopic rod during the working process.

There are 3 groups of microholes 6 from top to bottom on the rotating outer cylinder, and each group of microholes includes 2 microholes distributed symmetrically. The disc bottom surface 11 is fixedly connected with the rotating outer cylinder, and there are 6 columns 111 on it, each of which has a height of three, and is used to support the inner disc 9 so that the inner disc can rotate with the rotating outer cylinder 6 . The inner disk is a semi-hollow structure, and the lower surface of the inner disk is provided with grooves, and its outer surface can be made of different materials or materials with different surface roughness, so as to measure the adhesion of ice layers on different surfaces. After each test is completed, other types of inner discs 9 can be replaced and placed on the column 111 for the next test.

Before the measurement starts, install and fix the left and right pillars and the fixed plate, install the telescopic rod and its driving device on the fixed plate, then install the rotating table and the connecting plate under the fixed plate in turn, and connect the sensor and the connecting rod under the telescopic rod. Screw the actuator into the connecting rod through the thread, place the inner disk on the column, and then fix the rotating outer cylinder and the inner inner disk on the connecting plate. The distance between the actuating block and the inner disc is adjusted so that the distances between the three sets of actuating blocks and the inner disc increase sequentially from bottom to top. After all the devices are installed and fixed, start the rotating table to drive the connecting plate, the rotating outer cylinder, and the inner disc to rotate together, and then turn on the spray system (icing system) of the wind tunnel to make the ice layer on the surface of the rotating outer cylinder, the micropores The surface of the inner disk where it is located is evenly frozen. After the icing is completed, close the rotary table, stop the rotation, start the telescopic rod drive device, and retract the telescopic rod upward, driving the sensor, connecting rod, and actuator to retract upward. , after the actuating block touches the inner disk, it pushes the inner disk to separate from the ice layer on it (that is, the ice layer in the micropore of the rotating outer cylinder). During the separation process, the reading of the mechanical sensor gradually increases. When the inner disc separates from the ice layer, the sensor shows the maximum value, which is the adhesion force between the ice layer and the inner disc surface. After saving this set of data, continue to drive the telescopic rod to retract, so that the second The first and third sets of actuating blocks act on the inner discs, so that the adhesion force between the surface of the last two inner discs and the ice layer is measured in the same way, and multiple adhesion measurements after one icing are realized. After the measurement, different types of discs can be replaced to obtain ice adhesion data of different materials or different roughness surfaces of the same material.

In addition, there are many specific implementation methods and approaches of the present invention, and the above descriptions are only preferred implementation modes of the present invention. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (7)

1. The wind tunnel test device for repeatedly measuring the adhesion of the ice layer on the surface of the object is characterized in that it includes the left and right pillars and the fixed plate connected thereto, the telescopic rod and its driving device and fixing device, rotating table, for The connecting plate connecting the rotating table and the rotating outer cylinder, and the rotating outer cylinder; wherein, there are several groups of microholes on the surface of the rotating outer cylinder, and the inside of the rotating outer cylinder includes sensors, connecting rods, inner discs, working The moving block and the bottom surface of the disk, and the bottom surface of the disk is provided with a column; In the middle of the fixed plate is a telescopic rod, the telescopic rod is connected with the fixed plate through a fixing device, a rotating table and a connecting plate are installed under the fixed plate, and a rotating outer cylinder is installed under the connecting plate. 2 . The wind tunnel test device for measuring the adhesion of ice layers on the surface of objects multiple times according to claim 1 , wherein the outer surface of the inner disc is in close contact with the inner surface of the rotating outer cylinder. 3 . 3. The wind tunnel test device for repeatedly measuring the ice layer adhesion on the surface of an object according to claim 1, characterized in that: 3 groups of microholes on the surface of the rotating outer cylinder, each group comprising 2 microholes The holes are symmetrically distributed to ensure load balance during force measurement. 4. The wind tunnel test device for repeatedly measuring the adhesion 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, each inner disk The positions correspond to the positions of micropores; The lower end of the column is fixed on the bottom surface of the disc, and the upper end supports the inner disc. 5. The wind tunnel test device for repeatedly measuring the adhesion of ice layers on the surface of an object according to any one of claims 1 to 4, characterized in that: each of the actuating blocks is located in the corresponding inner circle Below the disc, and the distance from the inner disc is adjustable. 6. the wind tunnel test device for repeatedly measuring the ice layer adhesion on the surface of an object according to claim 1, wherein: a circular hole is arranged in the center of the inner disk, and its size is slightly larger than the diameter of the connecting rod; The inside of the disc is a semi-hollow structure. 7. The wind tunnel test device for repeatedly measuring the adhesion of ice layers on the surface of objects according to claim 1, wherein: the inner discs are directly and simply placed on the bottom surface of the cylinder or on the column; The discs are made of different materials or materials with different surface roughness to measure ice adhesion on different surfaces.

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