A device and method for measuring ice shape

Abstract

The present application belongs to the field of icing wind tunnel measurement technology, and discloses an icing shape measurement device and method. The icing shape measurement device includes a measurement module body, a probe, an auxiliary positioning module, an auxiliary support module, and a slide rail; the measurement module body is embedded with two coordinate positioning devices. P and Q ; Probes are provided at both ends of the measuring module body; the extension line of the probe passes through the coordinate positioning device of the measuring module body P and Q The ice shape measurement method includes the following steps: S1, start the wind tunnel spray system; S2, move the measurement module body; S3, start ice shape measurement and collection; S4, restore to the state before the test; S5, data processing. The purpose of the research and development of the present invention is to solve the problems of low accuracy and low automation of the existing hand-drawn ice shape method. The whole measurement process of the present invention can be automated without manual participation, and the measurement accuracy is high; there is no need to use tools such as hot knives to melt ice and spray developers, and there is no damage to the ice surface.

Description

Technical Field

[0001] The invention relates to an icing shape measuring device and method, belonging to the technical field of icing wind tunnel measurement. Background Art

[0002] Aircraft icing will cause the aircraft's aerodynamic shape to change, reducing the aircraft's aerodynamic performance and handling stability. At the same time, ice shedding will damage or destroy engine blades or other important downstream components, seriously affecting flight safety. Studying the aircraft's icing shape is an important prerequisite for the design of aircraft ice tolerance and anti-icing and de-icing systems, and icing wind tunnel testing is an important means of obtaining icing shapes.

[0003] After the icing wind tunnel test is completed, an ice shape measurement method is needed to obtain the ice shape. The commonly used ice shape measurement methods in existing icing wind tunnels are hand-drawn ice shape method and three-dimensional scanning method. The main defect of the hand-drawn ice shape method is that almost the entire process requires manual participation, which is difficult to automate, and a hot knife is needed to melt the ice on the surface of the model, destroying the ice shape. These defects seriously reduce the acquisition accuracy, and it is difficult to grasp the details of the ice shape for basic research and refined design; the main defect of the three-dimensional scanning method is that it is necessary to spray the developer on the ice surface to overcome the reflection and penetration of the ice layer. If there are some large protrusions and pits in the ice shape, the developer is difficult to adhere and the acquisition effect is poor. In addition, it will be subject to space limitations, resulting in a limited acquisition range of small-caliber wind tunnels, and if higher accuracy is required, manual refined operations and longer acquisition time are still required, affecting work efficiency.

[0004] Therefore, in order to solve the problems of low accuracy and low automation of the existing hand-drawn ice shape method and difficulty in developer adhesion and limited collection range of the three-dimensional scanning method, it is necessary to provide an ice shape measurement device and method. Summary of the invention

[0005] The purpose of the research and development of the present invention is to solve the problems of low precision and low automation of the existing hand-drawn ice shape method, and further provide an ice shape measurement device and method. On the one hand, the present invention is simple to operate and can be set to mechanical automatic operation, without the participation of personnel, and does not require hole opening measurement to affect efficiency; on the other hand, it does not require a hot knife to melt ice, does not require coordinate paper and ice shape drawing image recognition, and can automatically feedback ice shape data through sensors and data processing programs, basically eliminating the main source of error of the hand-drawn ice shape method. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0007] Technical solution 1, an ice shape measuring device, comprising a measuring module body, a probe, an auxiliary positioning module, an auxiliary support module and a slide rail;

[0008] The slide rail is arranged on the inner wall of the icing wind tunnel wall;

[0009] The auxiliary positioning module is U-shaped, including a U-shaped wall and a straight wall, the outer side of the U-shaped wall of the auxiliary positioning module faces the wind tunnel air inlet, and the straight wall of the auxiliary positioning module is connected to the top wall and the bottom wall of the icing wind tunnel through a slide rail;

[0010] The measuring module body has two built-in coordinate positioning devices, and the setting points of the two coordinate positioning devices are defined as P and Q , P and Q The relative position is fixed;

[0011] The measuring module body is placed inside the auxiliary positioning module, and the measuring module body is connected to the auxiliary positioning module through the auxiliary support module; probes are arranged at both ends of the measuring module body; the arrangement direction of the probes is PQ The direction of the line connecting the two points is consistent;

[0012] The auxiliary support module is V-shaped and includes two connecting rods. One end of the two connecting rods is hinged at one point and slidably connected to the inner wall of the auxiliary positioning module, and the other ends of the two connecting rods are respectively hinged to the measurement module body.

[0013] Technical Solution 2:

[0014] A method for measuring an icing shape is implemented by using the icing shape measuring device described in technical solution 1, and comprises the following steps:

[0015] S1. Turn on the wind tunnel spray system: an icing shape measuring device is stored in the wall of the icing wind tunnel, and arranged inwardly corresponding to the test model. After the icing wind tunnel parameters are set and stabilized, the spray system of the icing wind tunnel is turned on to start the icing test;

[0016] S2. Move the measurement module body: After the established icing test meets the requirements, turn off the spray system and the wind tunnel fan, adjust the position of the auxiliary positioning module on the slide rail, and the auxiliary positioning module drives the measurement module body and the probe from the corresponding test model of the icing wind tunnel wall to the ice measurement point on the model surface after the test through the auxiliary support module;

[0017] S3, start ice shape measurement and collection; adjust the chordal position of the measurement module body relative to the test model by adjusting the relative position of the auxiliary support module to the auxiliary positioning module, and make the probe contact the outer surface of the ice on the surface of the model after the test, trigger the two coordinate point positioning devices in the measurement module body to send out ultrasonic signals, and record the time from the end of the probe contacting the outer surface of the ice to the end of the probe contacting the outer surface of the ice. Q Length L , P and Q Distance is L 0 ; P and Q The coordinates of are ( X P , Y P , Z P )and( X Q , Y Q , Z Q );

[0018] S4, restore to the state before the test and prepare for the next test: after the measurement is completed, move an icing shape measuring device back to the inner side of the corresponding test model on the wall of the icing wind tunnel to complete a single test measurement. If the measurement is repeated, repeat step S3, or continue the test, after deicing the surface, repeat steps S1 to S3 until the probe traverses the outer surface of the ice on the surface of the model after the test;

[0019] S5. Data processing: P and Q The coordinates of the probe contacting the outer surface of the ice Q Length L , and process the data to obtain the coordinates of the ice shape. The formula is as follows:

[0020] ;

[0021] In the formula, x , y , z is the coordinate of the ice shape;

[0022] The ice shape coordinates are connected in time series to obtain the ice shape geometric data of a single measurement process; multiple measurement data are processed according to the formula, and the ice shape geometric data are obtained by connecting them in time series according to the measurement order.

[0023] The present invention has the following beneficial effects:

[0024] 1. The whole measurement process of the present invention can be automated, without manual participation, and has high measurement accuracy;

[0025] 2. The present invention, combined with the test model design, can realize multiple tests without opening the wind tunnel, thereby improving the test efficiency;

[0026] 3. The present invention does not need to use tools such as hot knives to melt ice, nor does it need to spray developer, and does not damage the ice surface. One test can be repeated, and the ice can be reused or used for other purposes;

[0027] 4. The present invention is applicable to two-dimensional and three-dimensional ice shape measurement and is not limited to the narrow space of a small wind tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of an ice shape measuring device;

[0030] Figure 2 Schematic diagram of the slide rail of the ice shape measurement device.

[0031] Reference numerals:

[0032] In the figure, 1-iced wind tunnel wall, 2-auxiliary positioning module, 3-auxiliary support module, 4-probe, 5-measurement module body, 6-test model, 7-icing on the model surface after the test, and 8-slide rail. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0034] Embodiment 1:

[0035] Combined with Figure 1 , 2 To illustrate this embodiment, an ice shape measuring device includes a measuring module body 5, a probe 4, an auxiliary positioning module 2, an auxiliary support module 3 and a slide rail 8;

[0036] The slide rail 8 is arranged on the inner wall of the icing wind tunnel wall 1;

[0037] The auxiliary positioning module 2 is U-shaped, including a U-shaped wall and a straight wall. The outer side of the U-shaped wall of the auxiliary positioning module 2 faces the wind tunnel air inlet, and the straight wall of the auxiliary positioning module 2 is connected to the top wall and the bottom wall of the icing wind tunnel wall 1 through a slide rail 8;

[0038] The measuring module body 5 has two built-in coordinate positioning devices, and the setting points of the two coordinate positioning devices are defined as P and Q , P and Q The relative position is fixed;

[0039] The measuring module body 5 is placed inside the auxiliary positioning module 2, and the measuring module body 5 is connected to the auxiliary positioning module 2 through the auxiliary support module 3; probes 4 are arranged at both ends of the measuring module body 5; the arrangement direction of the probes 4 is the same as that of the auxiliary positioning module 2. PQ The direction of the line connecting the two points is consistent;

[0040] The auxiliary support module 3 is V-shaped and includes two connecting rods. One end of the two connecting rods is hinged at one point and slidably connected to the inner wall of the auxiliary positioning module 2, and the other ends of the two connecting rods are respectively hinged to the measurement module body 5.

[0041] Embodiment 2:

[0042] A method for measuring an icing shape is implemented using the icing shape measuring device described in Example 1, and comprises the following steps:

[0043] S1. Turn on the wind tunnel spray system: an icing shape measuring device is stored in the wall 1 of the icing wind tunnel, and the corresponding test model 6 is arranged inwardly. After the icing wind tunnel parameters are set and stabilized, the spray system of the icing wind tunnel is turned on to start the icing test;

[0044] S2. Move the measurement module body: after the established icing test meets the requirements, turn off the spray system and the wind tunnel fan, adjust the position of the auxiliary positioning module 2 on the slide rail 8, and the auxiliary positioning module 2 drives the measurement module body 5 and the probe 4 to move from the icing wind tunnel wall 1 corresponding to the test model 6 to the inside to the icing measurement point 7 on the model surface after the test through the auxiliary support module 3;

[0045] S3, start ice shape measurement and collection; adjust the chordal position of the measurement module body 5 relative to the test model 6 by adjusting the relative position of the auxiliary support module 3 to the auxiliary positioning module 2, and make the probe 4 contact the outer surface of the ice 7 on the surface of the model after the test, trigger the two coordinate point positioning devices in the measurement module body 5 to send out ultrasonic signals, and record the time from the end of the probe 4 contacting the outer surface of the ice to the end of the probe 4 contacting the outer surface of the ice. Q Length L , P and Q Distance is L 0 ; P and Q The coordinates of are ( X P ,Y P , Z P )and( X Q , Y Q , Z Q );

[0046] S4, restore to the state before the test and prepare for the next test: after the measurement is completed, move an icing shape measuring device back to the icing wind tunnel wall 1 corresponding to the test model 6 to the inside, complete a single test measurement, repeat step S3 if the measurement is repeated, or continue the test, after deicing the surface, repeat steps S1 to S3 until the probe 4 traverses the outer surface of the ice 7 on the surface of the model after the test;

[0047] S5. Data processing: P and Q The coordinates of the probe 4 and the end thereof in contact with the outer surface of the ice Q Length L , and process the data to obtain the coordinates of the ice shape. The formula is as follows:

[0048] ;

[0049] In the formula, x , y , z is the coordinate of the ice shape;

[0050] The ice shape coordinates are connected in time series to obtain the ice shape geometric data of a single measurement process; multiple measurement data are processed according to the formula, and the ice shape geometric data are obtained by connecting them in time series according to the measurement order.

[0051] 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 method for measuring an icing shape, implemented by using an icing shape measuring device, the icing shape measuring device comprising a measuring module body (5), a probe (4), an auxiliary positioning module (2), an auxiliary support module (3) and a slide rail (8); The slide rail (8) is arranged on the inner wall of the icing wind tunnel wall (1); The auxiliary positioning module (2) is U-shaped, comprising a U-shaped wall and a straight wall, the outer side of the U-shaped wall of the auxiliary positioning module (2) faces the wind tunnel air inlet, and the straight wall of the auxiliary positioning module (2) is connected to the top wall and the bottom wall of the icing wind tunnel wall (1) via a slide rail (8); The measuring module body (5) has two coordinate positioning devices embedded therein, the setting points of the two coordinate positioning devices are defined as P and Q, and the relative positions of P and Q are fixed; The measuring module body (5) is placed inside the auxiliary positioning module (2), and the measuring module body (5) is connected to the auxiliary positioning module (2) through the auxiliary support module (3); probes (4) are arranged at both ends of the measuring module body (5); the arrangement direction of the probes (4) is consistent with the direction of the line connecting the two points PQ; The auxiliary support module (3) is V-shaped and comprises two connecting rods, one end of the two connecting rods is hinged at one point and is slidably connected to the inner wall of the auxiliary positioning module (2), and the other ends of the two connecting rods are respectively hinged to the measurement module body (5); It is characterized in that The measurement method includes the following steps: S1. Turn on the wind tunnel spray system: a device for measuring icing shape is stored in the wall (1) of the icing wind tunnel, and the corresponding test model (6) is arranged inwardly. After the icing wind tunnel parameters are set and stabilized, the spray system of the icing wind tunnel is turned on to start the icing test; S2. Move the measurement module body: after the predetermined icing test meets the requirements, turn off the spray system and the wind tunnel fan, adjust the position of the auxiliary positioning module (2) on the slide rail (8), and the auxiliary positioning module (2) drives the measurement module body (5) and the probe (4) to move from the corresponding test model (6) of the icing wind tunnel wall (1) to the measurement point position of icing (7) on the surface of the model after the test through the auxiliary support module (3); S3, start ice shape measurement and collection; adjust the chordal position of the measurement module body (5) relative to the test model (6) by adjusting the relative position of the auxiliary support module (3) to the auxiliary positioning module (2), and make the probe (4) contact the outer surface of the ice (7) on the surface of the model after the test, trigger the two coordinate point positioning devices in the measurement module body (5) to send ultrasonic signals, and record the length L from the end of the probe (4) contacting the outer surface of the ice to Q, and the distance between P and Q is L0; the coordinates of P and Q are (X P ,Y P ,Z P ) and (X Q ,Y Q ,Z Q ); S4, returning to the state before the test and preparing for the next test: after the measurement is completed, an icing shape measuring device is moved back to the icing wind tunnel wall (1) corresponding to the test model (6) to the inner side, completing a single test measurement. If the measurement is repeated, the step S3 is repeated, or the test is continued, and after the surface is de-iced, the steps S1 to S3 are repeated until the probe (4) traverses the outer surface of the ice (7) on the surface of the model after the test; S5, data processing: The coordinates of P and Q, as well as the length L from the end of the probe (4) that contacts the outer surface of the ice to Q, are processed to obtain the coordinates of the ice shape, and the formula is as follows: Where x, y, and z are the coordinates of the ice shape; The ice shape coordinates are connected in time series to obtain the ice shape geometric data of a single measurement process; multiple measurement data are processed according to the formula, and the ice shape geometric data are obtained by connecting them in time series according to the measurement order.

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