CN115096542B - Method and system for establishing basic icing test database - Google Patents
Method and system for establishing basic icing test database Download PDFInfo
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- CN115096542B CN115096542B CN202211036865.4A CN202211036865A CN115096542B CN 115096542 B CN115096542 B CN 115096542B CN 202211036865 A CN202211036865 A CN 202211036865A CN 115096542 B CN115096542 B CN 115096542B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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Abstract
The embodiment of the application discloses a method and a system for establishing a basic icing test database, and relates to the field of wind tunnel tests. The method comprises the following steps: when a main test piece with low blockage degree is arranged in the icing wind tunnel, a basic test device is arranged; developing a basic icing test corresponding to the basic test device while developing a corresponding main test according to the main test piece each time, and acquiring icing characteristic data of each basic icing test; and inputting the icing characteristic data of each basic icing test into the basic icing test database, thereby establishing the basic icing test database. By the method, the problem that data of the basic icing test cannot be effectively utilized in a mode of carrying out the basic icing test in the prior art can be effectively solved.
Description
Technical Field
The application relates to the field of wind tunnel tests, in particular to a method and a system for establishing a basic icing test database.
Background
The basic icing test is to study the icing characteristics of different basic test pieces under the condition of a wind tunnel test, for example, the difference of the icing characteristics of the basic test pieces with different sizes, the difference of the icing characteristics of the basic test pieces with different surface properties, the difference of the icing characteristics of the basic test pieces with different materials, the difference of the icing characteristics of the basic test pieces with different angles, and the difference of the icing characteristics of the basic test pieces with different shapes. Icing characteristic data obtained through a basic icing test can provide abundant research data for the icing field, and has an important function.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: in the prior art, the basic icing test is only temporarily carried out under the required research conditions, for example, when the influence of the test piece material on the icing characteristic needs to be researched, the basic icing test of a small number of times is carried out by using the basic test piece made of different materials, and the data of the basic icing test is only used for the current research.
Therefore, the prior art cannot effectively utilize the data of the basic icing test in a basic icing test mode.
Disclosure of Invention
The inventor of the application finds that a large amount of icing characteristic data are obtained by carrying out a large amount of basic icing tests in long-term practice, and the effectiveness of utilization of the basic icing test data can be improved by establishing a basic icing test database.
On the basis, the method for establishing the basic icing test database is provided, wherein a main test piece and a basic test device are arranged in an icing wind tunnel at the same time, so that a basic icing test is carried out while a main test is carried out, and icing characteristic data of each basic icing test is obtained; and inputting the icing characteristic data of each basic icing test into a basic icing test database, thereby establishing the basic icing test database. Therefore, the problem that data of the basic icing test cannot be effectively utilized in a basic icing test mode in the prior art can be effectively solved.
In a first aspect, a method for establishing a basic icing test database is provided, and the method includes: when a main test piece with low blockage degree is arranged in the icing wind tunnel, a basic test device is arranged; developing a basic icing test corresponding to the basic test device while developing a corresponding main test according to the main test piece each time, and acquiring icing characteristic data of each basic icing test; and inputting the icing characteristic data of each basic icing test into the basic icing test database, thereby establishing the basic icing test database.
In a second aspect, a basic icing test database building system is provided for executing the above method, and the system includes: the device comprises an icing wind tunnel, a main test piece, a basic test device and a database establishing device; the main test piece and the basic test device are arranged in the icing wind tunnel by the method, the main test piece is used for developing a main test, and the basic test device is used for developing a basic icing test corresponding to the basic test device when the main test is developed each time; the database establishing device is used for acquiring the icing characteristic data of each basic icing test, and inputting the icing characteristic data of each basic icing test into the basic icing test database, so as to establish the basic icing test database.
In summary, the present application has at least the following technical effects:
1. the application provides one of them basic icing test database establishment method, through the freezing characteristic data input basic icing test database with basic icing test at every turn to establish basic icing test database, when the relevant research in the field of icing needs to use freezing characteristic data, can follow this basic icing test database and obtain data, consequently, can promote the validity of basic icing test data's utilization.
2. According to the basic icing test database establishing method, the icing characteristic data of the basic icing test at each time is obtained by developing the basic icing test while developing the main test, and the basic icing test does not need to be developed independently, so that the cost of the basic icing test is saved.
3. According to the foundation icing test database establishing method, the distance between the foundation test device and the wall surface is set, and the distance between the foundation test device and the main test piece is set, so that the main test and the foundation icing test can be simultaneously carried out.
4. According to the method for establishing the basic icing test database, when the basic test device comprises 2 or more basic test pieces, the distance between every two (2) basic test pieces is set, so that the basic icing test can be simultaneously carried out on every basic test piece.
5. The application provides one of them basic icing test database system of establishing, through setting up the icing wind tunnel, the main test piece, basic test device and database establishing device, the icing characteristic data of icing the experiment of basic at every turn is acquireed with database establishing device, and the icing characteristic data input basic icing test database of icing the experiment of basic at every turn, thereby establish basic icing test database, when the relevant research in the field of icing needs to use icing characteristic data, can follow this basic icing test database and obtain data, therefore, can promote the validity of the utilization of basic icing test data.
6. The application provides one of them basic freezing test database system of establishing through setting up adjusting device in basic test device, makes the mount pad rotate with first predetermined rotation axis, and/or is used for making the mount pad with icing wind tunnel relative movement to can adjust the angle or the position of mount pad according to the experimental demand.
7. According to the basic icing test database establishing system, at least one basic test piece can rotate around a second preset rotating shaft and/or move relative to the mounting seat, so that the angle or the position of the at least one basic test piece can be adjusted according to test requirements.
Therefore, the scheme provided by the application can effectively solve the problem that the data of the basic icing test cannot be effectively utilized in the mode of carrying out the basic icing test in the prior art.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a basic icing test database establishment method provided in embodiment 1 of the present application;
FIG. 2 is a three-dimensional schematic diagram illustrating the arrangement of a main test piece and a basic test device in an icing wind tunnel according to embodiment 1 of the present application;
FIG. 3 is a plan view showing a main test piece and a basic test device arranged in an icing wind tunnel according to embodiment 2 of the present application;
FIG. 4 shows a schematic diagram of a basic test apparatus provided in example 3 of the present application;
FIG. 5 is a first schematic view showing the connection relationship between a base test piece and a mounting seat provided in example 3 of the present application;
FIG. 6 is a second schematic diagram illustrating a connection relationship between a base test piece and a mounting seat provided in embodiment 3 of the present application;
FIG. 7 is a first schematic view showing the connection relationship between the mounting seat and the adjusting device provided in embodiment 3 of the present application;
FIG. 8 is a second schematic view showing the connection relationship between the mounting seat and the adjusting device provided in embodiment 3 of the present application;
fig. 9 is a third schematic view showing a connection relationship between a mounting seat and an adjusting device provided in embodiment 3 of the present application;
FIG. 10 is a third schematic view showing the connection relationship between the basic test piece and the mounting seat provided in example 3 of the present application;
FIG. 11 is a fourth schematic view showing the connection relationship between the basic test piece and the mounting seat provided in example 3 of the present application;
fig. 12 is a schematic diagram showing a fifth connection relationship between the basic test piece and the mounting base provided in embodiment 3 of the present application.
In the drawings: the device comprises a 110 foundation test device, a 111 foundation test piece, a 112 mounting seat, a 113 adjusting device, a 114 telescopic rod, a 120 icing wind tunnel, a 121 wall surface, a 130 main test piece and a 140 incoming flow direction.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Icing characteristic data acquired through a basic icing test can provide abundant research data for the icing field, and has an important effect. In the prior art, a basic icing test is only temporarily carried out under required research conditions, for example, when the influence of a test piece material on icing characteristics needs to be researched, a basic test piece made of different materials is used for carrying out a small number of basic icing tests, and the data of the basic icing test is only used for the current research. Therefore, the data of the basic icing test cannot be effectively utilized in the mode of carrying out the basic icing test in the prior art.
Therefore, in order to solve the above-mentioned defects, an embodiment of the present application provides a method for establishing a basic icing test database, when a primary test is required, a primary test piece with a low clogging degree is set in an icing wind tunnel, and a basic test device is set, so that a basic icing test is performed simultaneously when the primary test is required, an additional independent basic icing test is not required, icing characteristic data of each basic icing test is obtained, the icing characteristic data is input into the basic icing test database, the basic icing test database is established, and effectiveness of utilization of the basic icing test data is improved.
The method for establishing the basic icing test database related to the present application is described below. It should be noted that: the reference numbers to the method steps of the present application are not intended to limit the order thereof, but rather to distinguish the different steps.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for establishing a basic icing test database according to embodiment 1 of the present application. In this embodiment, the method may include the steps of:
step S110: when a main test piece with low blockage degree is arranged in the icing wind tunnel, a basic test device is arranged.
As shown in FIG. 2, FIG. 2 is a three-dimensional schematic view of the placement of a main test piece 130 and a base test fixture 110 in an icing wind tunnel 120. In fig. 2, the incoming flow direction 140 is the direction marked by the black arrow.
In the embodiment of the present application, the icing wind tunnel 120 may be a large wind tunnel, for example, an icing wind tunnel 120 with a height of 2 meters and a width of 3 meters. The main test piece 130 may be a test piece with a low blockage degree, for example, a test piece with a blockage ratio of less than 5%, wherein the blockage ratio is a ratio of a cross-sectional area of the test piece perpendicular to the incoming flow direction 140 to a cross-sectional area of the icing wind tunnel 120 perpendicular to the incoming flow direction 140. If the icing wind tunnel 120 is 2 meters high and 3 meters wide, the main test piece 130 may be: taking the NACA0012 airfoil as an example, the airfoil has the chord length of 1 m and the blade height of 0.12 m, wherein the blade height is the thickness of the airfoil. The dimensions of the main test piece 130 may be: the main test piece 130 has a dimension in the blade height direction of not more than 15% of the icing wind tunnel 120.
In the present embodiment, the basic test device 110 may include at least one basic test piece, which is a small model, for example, a model having a height of 2 dm and a width of 1 dm. And the basic test piece can be an airfoil shape and also can be in other shapes. If the number of the basic test pieces is 2 or more than 2, each of the basic test pieces may have a difference, and specifically, the difference may be at least one of different sizes, different surface properties, different materials, different angles, and different shapes. The base test set 110 may be sized as follows: the sectional area of the basic test device 110 perpendicular to the incoming flow direction 140 is not greater than 10% of the sectional area of the icing wind tunnel 120 perpendicular to the incoming flow direction 140, where the sectional area of the basic test device 110 may refer to the area of the envelope contour of the basic test device 110, and if the basic test device 110 is rectangular, the sectional area is long by wide.
Step S120: while the corresponding main test is performed according to the main test piece 130 each time, the basic icing test corresponding to the basic test device 110 is performed, and the icing characteristic data of the basic icing test each time is acquired.
When the main test is performed through the main test piece 130 with low blockage degree in the icing wind tunnel 120, because the blockage degree of the main test piece 130 to the airflow is low, the influence range of the flow field and the cloud and mist field in the blade height direction of the main test piece 130 on the main test piece 130 is small, most of the uniform flow field and the cloud and mist field which are not influenced still exist in the icing wind tunnel 120, and therefore the basic icing test can be performed by utilizing the uniform flow field and the cloud and mist field.
In an exemplary embodiment, the icing characteristic data of the base icing test includes: at least one of icing characteristic data associated with a size, icing characteristic data associated with a surface property, icing characteristic data associated with a material, icing characteristic data associated with an angle, icing characteristic data associated with a shape.
In the embodiments of the present application, the surface property may be roughness, wettability, etc., and the angle may be sweep back angle, attack angle, etc.
In the embodiment of the present application, the icing characteristic data of the basic icing test may also be data associated with other parameters, which is not limited in the present application.
As an alternative, if it is desired to obtain data on the effect of different materials on icing characteristics, 4 base test pieces of different materials may be provided in the base test apparatus 110 to obtain icing characteristic data associated with the materials.
Step S130: and inputting the icing characteristic data of each basic icing test into the basic icing test database, thereby establishing the basic icing test database.
The basic icing test database is used for receiving and storing icing characteristic data of each basic icing test and outputting the icing characteristic data. As an alternative embodiment, the base icing test database also performs functions such as icing characteristic data classification and calculation.
According to the method for establishing the basic icing test database, the icing characteristic data of each basic icing test is input into the basic icing test database, so that the basic icing test database is established, and when the icing characteristic data are required to be used in related research in the icing field, data can be acquired from the basic icing test database, so that the effectiveness of utilization of the basic icing test data can be improved.
According to the basic icing test database establishing method provided by the embodiment of the application, the icing characteristic data of each basic icing test is obtained by developing the basic icing test while developing the main test, and the basic icing test does not need to be developed independently, so that the cost of the basic icing test is saved.
Example 2
On the basis of embodiment 1, embodiment 2 includes the following contents in addition to all contents of embodiment 1:
in an exemplary embodiment, at a target distance from the exit
The distance between the basic test device 110 and the wall surface is greater than a first distance, the distance between the basic test device 110 and the main test piece 130 is greater than a second distance, wherein the outlet is an outlet of the icing wind tunnel 120 and is used for releasing incoming flow, and the wall surface is the wall surface of the icing wind tunnel 120.
In the embodiment of the present application, the base test device 110 is disposed between the main test piece 130 and the wall surface, the distance between the base test device 110 and the wall surface is the distance between the side of the base test device 110 close to the wall surface and the wall surface, and the distance between the base test device 110 and the main test piece 130 is the distance between the side of the base test device 110 close to the main test piece 130 and the main test piece 130.
As shown in fig. 3, fig. 3 is a plan view of the main test piece 130 and the base test device 110 disposed in the icing wind tunnel 120. In fig. 3, the main test piece 130 is on the left side of the base test device 110, and the wall surface 121 is on the right side of the base test device 110. The outlet is on the underside of the icing wind tunnel 120 in figure 3.
In an exemplary embodiment, the active test segment of the basic test device 110 is spaced from the outlet
To
The effective test section of the main test piece 130 is a distance from the outlet
To
OfThe target distance
Is composed of
And
the greater of the number of the first to the second,
the first distance is
Or
Wherein, in the step (A),
the shortest distance between the basic test device 110 and the outlet,
the shortest distance between the main test piece 130 and the outlet, D is the cross-sectional hydraulic diameter of the base test device 110,
is the density of the incoming flow of water,
is the speed of the incoming flow of the fluid,
is the coefficient of viscosity of the air,
the length of the portion of the base test apparatus required to be tested,
for testing the main test partThe length of the portion;
and/or: the second distance is
Or
。
As an alternative embodiment, as shown in fig. 3, the portion of the lower side of the main test piece 130 and the dotted line in fig. 3 is the effective test section of the main test piece 130, and the portion of the lower side of the basic test device 110 and the dotted line is the effective test section of the basic test device 110.
For the distance of the underside of the base test unit 110 from the underside of the icing wind tunnel 120,
is the distance of the underside of the main test piece 130 from the underside of the icing wind tunnel 120.
In the embodiment of the present application,
wherein, in the step (A),
for the cross-sectional area of the base test device 110,
is the circumference of the base test device 110.
According to the method for establishing the basic icing test database provided by the embodiment of the application, the distance between the basic test device 110 and the wall surface 121 is set, and the distance between the basic test device 110 and the main test piece 130 is set, so that the main test and the basic icing test can be simultaneously carried out.
In an exemplary embodiment, if the basic test device 110 includes 2 or more basic test pieces, the distance between every 2 basic test pieces satisfies a preset distance condition, where the preset distance condition is: the minimum distance between 2 base trials was greater than 4e, e being the maximum of the cross-sectional hydraulic diameters of the 2 base trials.
In the embodiment of the present application,
wherein, in the step (A),
is the cross-sectional area of the base test piece,
the perimeter of the base test piece.
As an alternative, at the exit opening
Where the distance between the main test piece 130 and the wall surface 121 is greater than
。
According to the method for establishing the basic icing test database provided by the embodiment of the application, when the basic test device 110 comprises 2 or more basic test pieces, the distance between every two (2) basic test pieces is set, so that each basic test piece can be subjected to a basic icing test at the same time.
Example 3
Referring to fig. 2, embodiment 3 of the present application provides a basic icing test database establishment system. In this embodiment, the system may include: the icing wind tunnel 120, the main test piece 130, the basic test device 110 and the database establishing device.
The main test piece 130 and the basic test device 110 are disposed in the icing wind tunnel 120 by the method in the above method embodiment, the main test piece 130 is used for carrying out a main test, and the basic test device 110 is used for carrying out a basic icing test corresponding to the basic test device 110 each time the main test is carried out.
In the embodiment of the present application, the contents of the main test piece 130 and the basic test device 110 in embodiments 1 and 2 can be referred to, and are not described herein again.
The database establishing device is used for acquiring the icing characteristic data of each basic icing test, and inputting the icing characteristic data of each basic icing test into the basic icing test database, so as to establish the basic icing test database.
As an alternative embodiment, the database creation device may be provided in the icing wind tunnel 120. The database establishing device can comprise an image acquisition device, a sensor and other devices, and can automatically acquire the icing characteristic data of each basic icing test. The basic icing test database can be arranged in the database establishing device, and the database establishing device directly inputs icing characteristic data into the internal basic icing test database after acquiring the icing characteristic data. The basic icing test database can also be arranged in other equipment, and the database establishing device can be communicated with the equipment provided with the basic icing test database so as to transmit the icing characteristic data to the basic icing test database of the equipment.
As another optional embodiment, the database establishing device may not be disposed in the icing wind tunnel 120, the basic icing test database is disposed in the database establishing device, and the user manually obtains the icing characteristic data of each basic icing test and inputs the icing characteristic data into the basic icing test database in the database establishing device.
In an exemplary embodiment, as shown in FIG. 4, FIG. 4 is a schematic view of a base test device 110. The basic test device 110 includes: at least one basic test piece 111, a mounting base 112 and an adjusting device 113.
The mounting seat 112 is used for mounting the at least one base test piece 111.
The adjusting device 113 is connected to the mounting base 112, and is configured to rotate the mounting base 112 with a first preset rotation axis, and/or to move the mounting base 112 and the icing wind tunnel 120 relatively.
In an embodiment of the present application, the moving may include: the height of mount 112 varies relative to icing wind tunnel 120, and the horizontal position of mount 112 varies relative to icing wind tunnel 120.
As an alternative embodiment, the foundation trial 110 may further include a base, which is connected to the adjusting device 113 for supporting the adjusting device 113, the mounting base 112 and the foundation trial 111. At least one threaded mounting hole may be provided on the base, and the base may be mounted on the icing wind tunnel 120 by mounting a screw in the threaded mounting hole.
The basic test piece 111 may be in the shape of an airfoil, a cylinder, a cuboid, or other shapes. The shape of the mounting seat 112 may be a cylinder, a rectangular parallelepiped, or other shapes. The shape of the adjusting device 113 may be a cylinder, a cuboid, or other shapes.
As shown in fig. 5, fig. 5 is a first schematic diagram illustrating a connection relationship between the base test piece 111 and the mounting base 112. The mount 112 may be provided with a projection, the end of the base test piece 111 may be provided with a hole, and the base test piece 111 is mounted on the mount 112 by disposing the projection of the mount 112 in the hole of the base test piece 111.
As shown in fig. 6, fig. 6 is a second schematic diagram illustrating a connection relationship between the base test piece 111 and the mounting base 112. The mount 112 may be provided with a hole, and the end of the base test piece 111 may be provided with a projection, and the base test piece 111 is mounted on the mount 112 by disposing the projection of the base test piece 111 in the hole of the mount 112.
As shown in fig. 7, fig. 7 is a first schematic view of the connection relationship between the mounting base 112 and the adjusting device 113. The mounting block 112 may be provided with a hole, and the end of the adjusting device 113 may be provided with a protrusion, so that the adjusting device 113 is coupled with the mounting block 112 by disposing the protrusion of the adjusting device 113 in the hole of the mounting block 112. The protrusion of the adjusting device 113 can relatively rotate in the hole of the mounting base 112, so that the mounting base 112 rotates with the axis of the adjusting device 113 as the rotating shaft, and at this time, the first preset rotating shaft is the axis of the adjusting device 113.
As shown in fig. 8, fig. 8 is a second schematic view illustrating a connection relationship between the mounting base 112 and the adjusting device 113. The mounting base 112 may be provided with a protrusion, the protrusion may be provided with a thread, the end of the adjusting device 113 may be provided with a rotary threaded hole, as shown by a dotted line at the adjusting device 113 in fig. 8, the outer side of the adjusting device 113 may be further provided with a fixed threaded hole, as shown by a circle at the adjusting device 113 in fig. 8, the protrusion of the mounting base 112 is disposed in the rotary threaded hole of the adjusting device 113, and a screw is disposed at the fixed threaded hole of the adjusting device 113, so that the adjusting device 113 is connected with the mounting base 112.
The projection of the mounting base 112 can relatively rotate in the rotating threaded hole of the adjusting device 113, and when the mounting base 112 is rotated to a target angle and a target height, the mounting base 112 is fixed at the target angle and the target height by screwing the screw in the fixing threaded hole of the adjusting device 113. In this way, the mounting base 112 can be rotated by a first predetermined rotation axis, and/or the mounting base 112 can be adjusted in height, in which case the first predetermined rotation axis is the axis of the adjusting device 113.
In an exemplary embodiment, the adjusting device 113 includes a first connecting ring, the first connecting ring is sleeved on the mounting seat 112, and the mounting seat 112 can rotate around the axis thereof as a rotating shaft through the cooperation between the first connecting ring and the mounting seat 112.
As shown in fig. 9, fig. 9 is a third schematic view of the connection relationship between the mounting base 112 and the adjusting device 113. The first connecting ring comprises a ring part and a rod part, the ring part of the first connecting ring is sleeved on the mounting seat 112, the rod part of the first connecting ring can be provided with threads, the end part of the adjusting device 113 can be provided with a rotary threaded hole, as shown by a dotted line at the position of the adjusting device 113 in fig. 9, the outer side of the adjusting device 113 can also be provided with a fixed threaded hole, as shown by a circle at the position of the adjusting device 113 in fig. 9, the rod part of the first connecting ring is arranged in the rotary threaded hole of the adjusting device 113, and a screw is arranged at the position of the fixed threaded hole of the adjusting device 113, so that the adjusting device 113 is connected with the mounting seat 112.
The rod of the first connecting ring can rotate relatively in the rotating threaded hole of the adjusting device 113, and when the mounting base 112 rotates to the target angle and the target height, the mounting base 112 is fixed at the target angle and the target height by screwing the screw in the fixing threaded hole of the adjusting device 113. In this way, the mounting base 112 can be rotated by a first predetermined rotation axis, and/or the mounting base 112 can be adjusted in height, in which case the first predetermined rotation axis is the axis of the adjusting device 113.
The outer side of the ring part of the first connecting ring can also be provided with a ring part threaded hole, a screw is arranged at the ring part threaded hole of the first connecting ring, the mounting seat 112 can rotate or move horizontally in the ring part of the first connecting ring, and when the mounting seat 112 rotates to a target angle or moves to a target position, the mounting seat 112 is fixed at the target angle or the target position by screwing the screw in the ring part threaded hole of the first connecting ring. At this time, the first predetermined rotation axis is an axis of the mounting base 112.
In an exemplary embodiment, the at least one base test piece 111 may rotate about a second predetermined rotation axis and/or move relative to the mount 112.
As shown in fig. 10, fig. 10 is a third schematic view of the connection relationship between the base test piece 111 and the mounting seat 112. The mounting base 112 may be provided with a rotary threaded hole, as shown by a dotted line at the mounting base 112 in fig. 10, and the outer side of the mounting base 112 may be provided with a fixing threaded hole, as shown by a circle at the mounting base 112 in fig. 10, the base test piece 111 may be provided with a protrusion, and a thread may be provided on the protrusion, by setting the protrusion of the base test piece 111 in the rotary threaded hole of the mounting base 112, and setting a screw at the fixing threaded hole of the mounting base 112, the base test piece 111 may be mounted on the mounting base 112.
The projection of the base test piece 111 can relatively rotate in the rotation screw hole of the mount 112, and when the base test piece 111 is rotated to a target angle and a target height, the base test piece 111 is fixed at the target angle and the target height by tightening the screw in the fixing screw hole of the mount 112. In this way, the base test piece 111 may be rotated about a second predetermined rotation axis, and/or the height of the base test piece 111 may be adjusted, in which case the second predetermined rotation axis is the axis of the base test piece 111.
As shown in fig. 11, fig. 11 is a fourth schematic view of the connection relationship between the base test piece 111 and the mounting seat 112. The mounting seat 112 may be provided with a rotary threaded hole, as shown by a dotted line at the mounting seat 112 in fig. 11, the outer side of the mounting seat 112 may be further provided with a fixed threaded hole, as shown by a circle at the mounting seat 112 in fig. 11, the basic test piece 111 may be provided with a threaded hole, as shown by a dotted line at the basic test piece 111 in fig. 11, the basic test device 110 may further include an expansion link 114, both ends of the expansion link 114 may be provided with threads, the basic test piece 111 may be connected to the expansion link 114 by setting one end of the expansion link 114 in the threaded hole of the basic test piece 111 through a thread, and the other end of the expansion link 114 may be set in the rotary threaded hole of the mounting seat 112 through a thread, and a screw may be set at the fixed threaded hole, so that the mounting seat 112 is connected to the expansion link 114, thereby mounting the basic test piece 111 on the mounting seat 112.
After the basic test piece 111 and the telescopic rod 114 are connected, the basic test piece 111 and the telescopic rod 114 can relatively rotate in a rotating threaded hole of the mounting seat 112, the height of the basic test piece 111 can be adjusted by adjusting the length of the telescopic rod 114, and when the basic test piece 111 and the telescopic rod 114 rotate to a target angle and a target height, the basic test piece 111 and the telescopic rod 114 are fixed at the target angle and the target height by screwing screws in fixing threaded holes of the mounting seat 112. In this way, the base test piece 111 may be rotated about a second predetermined rotation axis, and/or the height of the base test piece 111 may be adjusted, in which case the second predetermined rotation axis is the axis of the base test piece 111.
In an exemplary embodiment, the mounting base 112 is provided with at least one second connection ring, the at least one second connection ring is used for connecting with the at least one basic test piece 111, and the at least one basic test piece 111 can rotate around the axis of the mounting base 112 as a rotation axis through the cooperation between the second connection ring and the mounting base 112.
As shown in fig. 12, fig. 12 is a schematic view showing a connection relationship between the base test piece 111 and the mounting seat 112. The second connection ring includes a ring portion and a rod portion, the ring portion of the second connection ring is sleeved on the mounting seat 112, the rod portion of the second connection ring may be provided with a thread, and the end portion of the basic test piece 111 may be provided with a threaded hole, as shown by a dotted line at the position of the basic test piece 111 in fig. 12, the rod portion of the second connection ring is threadedly disposed in the threaded hole of the basic test piece 111, so that the basic test piece 111 is connected with the rod portion of the second connection ring, thereby mounting the basic test piece 111 on the mounting seat 112.
The outer side of the ring portion of the second connection ring can also be provided with a ring portion threaded hole, a screw is arranged at the ring portion threaded hole of the second connection ring, the ring portion of the second connection ring can rotate or horizontally move on the mounting seat 112, and when the second connection ring rotates to a target angle or moves to a target position, the second connection ring is fixed at the target angle or the target position by screwing the screw in the ring portion threaded hole of the second connection ring. At this time, the second preset rotation axis is the axis of the mounting seat 112.
As an alternative, the secondary connecting ring may be removable from the mounting block 112, and a plurality of secondary connecting rings may be provided on the mounting block 112 according to the experimental requirements.
The basic icing test database establishing system provided by the embodiment of the application comprises an icing wind tunnel 120, a main test piece 130, a basic test device 110 and a database establishing device, wherein the database establishing device is used for acquiring icing characteristic data of basic icing tests at each time, and inputting the icing characteristic data of the basic icing tests at each time into a basic icing test database, so that the basic icing test database is established, when the icing characteristic data are required to be used in related researches in the icing field, data can be acquired from the basic icing test database, and therefore, the effectiveness of utilization of basic icing test data can be improved.
According to the basic icing test database establishing system provided by the embodiment of the application, the adjusting device 113 is arranged in the basic test device 110, so that the mounting seat 112 rotates with a first preset rotating shaft, and/or the mounting seat 112 and the icing wind tunnel 120 move relatively, and the angle or the position of the mounting seat 112 can be adjusted according to test requirements.
According to the basic icing test database establishing system provided by the embodiment of the application, the at least one basic test piece 111 can rotate around the second preset rotating shaft and/or move relative to the mounting seat 112, so that the angle or the position of the at least one basic test piece 111 can be adjusted according to test requirements.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A basic icing test database building method is characterized by comprising the following steps:
s110, when a main test piece with low blockage degree is arranged in the icing wind tunnel, arranging a basic test device;
s120, developing a basic icing test corresponding to the basic test device while developing a corresponding main test according to the main test piece each time, and acquiring icing characteristic data of the basic icing test each time;
s130, inputting the icing characteristic data of each basic icing test into the basic icing test database, so as to establish the basic icing test database;
at a target distance from the outlet
The distance between the foundation test device and the wall surface is larger than a first distance, the distance between the foundation test device and the main test piece is larger than a second distance, the outlet is an outlet of the icing wind tunnel and used for releasing incoming flow, and the wall surface is the wall surface of the icing wind tunnel;
the effective test section of the basic test device isFrom the outlet
To
The effective test section of the main test piece is a distance from the outlet
To
The target distance of
Is composed of
And
the greater of the number of the first to the second,
the first distance is
Or
Wherein, in the step (A),
is the shortest distance of the basic test device from the outlet,
is the shortest distance between the main test piece and the outlet, D is the section hydraulic diameter of the basic test device,
is the density of the incoming flow of water,
is the speed of the incoming flow of the fluid,
is the coefficient of viscosity of the air,
the length of the portion of the base test apparatus required to be tested,
the length of the portion of the main test piece that needs to be tested;
the second distance is
Or
。
2. The method for building a base icing test database according to claim 1, wherein the icing characteristic data of the base icing test comprises: at least one of icing characteristic data associated with a size, icing characteristic data associated with a surface property, icing characteristic data associated with a material, icing characteristic data associated with an angle, icing characteristic data associated with a shape.
3. The method for establishing the basic icing test database according to claim 1 or 2, wherein if the basic test device comprises 2 or more basic test pieces, the distance between every 2 basic test pieces meets a preset distance condition, wherein the preset distance condition is as follows: the minimum distance between 2 base trials was greater than 4e, e being the maximum of the cross-sectional hydraulic diameters of the 2 base trials.
4. A basic icing test database building system for performing the method according to any one of claims 1 to 3, characterized in that the system comprises: the device comprises an icing wind tunnel, a main test piece, a basic test device and a database establishing device;
the main test piece and the basic test device are arranged in the icing wind tunnel according to the method of any one of claims 1 to 3, the main test piece is used for carrying out a main test, and the basic test device is used for carrying out a basic icing test corresponding to the basic test device each time the main test is carried out;
the database establishing device is used for acquiring the icing characteristic data of each basic icing test, and inputting the icing characteristic data of each basic icing test into the basic icing test database, so as to establish the basic icing test database.
5. The basic icing test database building system according to claim 4, wherein the basic test device comprises: the device comprises at least one basic test piece, a mounting seat and an adjusting device;
the mounting seat is used for mounting the at least one basic test piece;
the adjusting device is connected with the mounting seat and used for enabling the mounting seat to rotate by a first preset rotating shaft and/or enabling the mounting seat and the icing wind tunnel to move relatively.
6. The basic icing test database building system according to claim 5, wherein the adjusting device comprises a first connecting ring which is sleeved on the mounting seat, and the mounting seat can rotate by taking the axis of the first connecting ring as a rotating shaft through the matching between the first connecting ring and the mounting seat.
7. A basic icing test database building system according to claim 5, wherein the at least one basic test piece is rotatable about a second predetermined axis of rotation and/or moveable relative to the mounting.
8. The basic icing test database building system according to claim 7, wherein at least one second connecting ring is arranged on the mounting seat and used for connecting with the at least one basic test piece, and the at least one basic test piece can rotate around the axis of the mounting seat as a rotating shaft through the cooperation between the second connecting ring and the mounting seat.
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