Temperature field control test method and system based on vortex tube matrix

Abstract

The invention belongs to the field of thermal intensity test control, and particularly relates to a temperature field control test method and system based on a vortex tube matrix. The method comprises the following steps: constructing a vortex tube matrix; carrying out temperature loading on a temperature loading area of a test piece according to the vortex tube matrix, calibrating vortex tube parameters according to the determined test parameters, and fitting a coefficient matrix; and according to the vortex tube matrix and the coefficient matrix, performing a temperature field control test on a test piece. According to the temperature field control test method based on the vortex tube matrix, through a vortex tube matrix control technology, accurate temperature control of a low-temperature field in a test area is achieved in a mode that compressed air is cooled and heated through vortex tubes, test loss is reduced, and test economy is effectively improved.

Description

Technical Field

[0001] The present application belongs to the field of thermal strength test control, and in particular relates to a temperature field control test method and system based on a vortex tube matrix. Background Art

[0002] Aircraft are affected by complex environments during flight, and high and low temperatures occur alternately. For some parts of the body that are easily affected by temperature, temperature changes are directly related to the life of the parts. Therefore, high and low temperature life tests for aircraft parts are necessary. In previous high and low temperature tests of aircraft, considering that the test periodicity must be controllable, the cumulative life damage of the body structure caused by temperature is generally given in the form of a temperature field load curve that changes with time through a life conversion method. This form can complete high and low temperature tests in a relatively short period of time to determine the life of the test piece, but it also has the characteristics of rapid heating and cooling per unit time.

[0003] Generally speaking, the test cooling process is generally carried out by refrigerant convection heat exchange, such as directly introducing refrigerants such as liquid nitrogen into the test piece flow field, and heating is achieved by means of electric heaters, and the form of the flow field should be consistent with the incoming flow during the flight of the aircraft. However, the test incoming flow cannot achieve the ideal uniform distribution during the flight of the aircraft, and the simulation results are not reliable, which further affects the boundary conditions of the flow field, and ultimately produces a large temperature gradient in various areas of the test piece, making it difficult to achieve a uniform temperature field. At the same time, the test cycle of this type is basically calculated in years, and refrigerants such as liquid nitrogen need to be consumed in large quantities, which will impose a heavy burden on economic costs.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a temperature field control test method and system based on a vortex tube matrix to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of the present application provides a temperature field control test method based on a vortex tube matrix, comprising:

[0008] Construct a vortex tube matrix;

[0009] Performing temperature loading on the temperature loading area of ​​the test piece according to the vortex tube matrix, calibrating the vortex tube parameters according to the determined test parameters, and fitting a coefficient matrix;

[0010] A temperature field control test is performed on the test piece according to the vortex tube matrix and the coefficient matrix.

[0011] In at least one embodiment of the present application, constructing a vortex tube matrix includes:

[0012] A vortex tube cooling matrix is ​​constructed through the cold air end of the vortex tube;

[0013] A vortex tube heating matrix is ​​constructed through the hot gas end of the vortex tube;

[0014] The vortex tube cooling matrix and the vortex tube heating matrix are arranged crosswise to obtain a vortex tube matrix.

[0015] In at least one embodiment of the present application, the test parameters include the area of ​​the temperature loading region, the minimum test temperature, the maximum test temperature, the test heating rate, and the test cooling rate.

[0016] In at least one embodiment of the present application, the vortex tube parameters include the number of vortex tubes, the efficiency of the vortex tubes, and the distance between the vortex tubes and the temperature loading area.

[0017] In at least one embodiment of the present application, the vortex tube efficiency includes the lowest temperature and the highest temperature that the vortex tube can reach.

[0018] In at least one embodiment of the present application, the test piece has a plurality of temperature loading areas.

[0019] The second aspect of the present application provides a temperature field control test system based on a vortex tube matrix, comprising:

[0020] A vortex tube, wherein the vortex tube has a vortex tube cold gas end and a vortex tube hot gas end;

[0021] A control system controls the vortex tube switch and the vortex tube gas flow rate through a temperature control module.

[0022] The invention has at least the following beneficial technical effects:

[0023] The temperature field control test method based on the vortex tube matrix of the present application realizes precise temperature control of the low temperature field in the test area by cooling and heating the compressed air through the vortex tubes through the vortex tubes, thereby reducing test losses and effectively improving the test economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of a temperature field control test method based on a vortex tube matrix according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0027] The following is combined with Figure 1 This application is described in further detail.

[0028] The first aspect of the present application provides a temperature field control test method based on a vortex tube matrix, comprising the following steps:

[0029] Construct a vortex tube matrix;

[0030] The temperature loading area of ​​the test piece is subjected to temperature loading according to the vortex tube matrix, the vortex tube parameters are calibrated according to the determined test parameters, and the coefficient matrix is ​​fitted;

[0031] According to the vortex tube matrix and the coefficient matrix, a temperature field control test is carried out on the test piece.

[0032] The temperature field control test method based on the vortex tube matrix of the present application, the process of constructing the vortex tube matrix is:

[0033] A vortex tube cooling matrix is ​​constructed through the cold air end of the vortex tube;

[0034] A vortex tube heating matrix is ​​constructed through the hot gas end of the vortex tube;

[0035] The vortex tube cooling matrix and the vortex tube heating matrix are cross-arranged to obtain a vortex tube matrix.

[0036] The temperature field control test method based on the vortex tube matrix of the present application is to calibrate the vortex tube parameters according to the determined test parameters before the formal test, wherein the test parameters include the area of ​​the temperature loading area, the minimum test temperature, the maximum test temperature, the test heating rate, and the test cooling rate. The vortex tube parameters include the number of vortex tubes, the vortex tube efficiency, and the distance between the vortex tube and the temperature loading area, wherein the vortex tube efficiency includes the minimum temperature and the maximum temperature that the vortex tube can reach. It can be understood that there are multiple temperature loading areas on the test piece, and the coefficient matrix corresponding to each temperature loading area needs to be fitted during calibration.

[0037] The temperature field control test method based on the vortex tube matrix of the present application, in order to achieve the temperature field curve requirements, first constructs a vortex tube matrix in a specific area, uses the cold air end of the vortex tube to construct a cooling matrix, uses the hot air end of the vortex tube to construct a heating matrix, and cross-arranges the two matrices to achieve temperature control of the loading area and ensure the uniformity of the temperature field during the temperature loading process. According to the area of ​​the temperature loading area, the minimum test temperature, the maximum test temperature, the test heating rate, and the test cooling rate, the minimum number of vortex tubes, the efficiency of the vortex tubes, and the distance from the test piece are calibrated, and the coefficient matrix of the vortex tube construction in this type of area is fitted to achieve the construction of the vortex tube matrix that can meet the requirements of the uniformity of the regional temperature field, improve the temperature control accuracy, and meet the economy of the loading process.

[0038] Based on the above-mentioned temperature field control test method based on the vortex tube matrix, the second aspect of the present application provides a temperature field control test system based on the vortex tube matrix, including: a vortex tube and a control system.

[0039] The vortex tube has a vortex tube cold air end and a vortex tube hot air end; the control system controls the vortex tube switch and the vortex tube gas flow through a temperature control module.

[0040] The temperature field control test system based on the vortex tube matrix of the present application, the vortex tube is a device for generating cold and hot airflows by generating vortices in the injected high-pressure and high-speed airflow, thereby separating the cold and hot airflows, and discharging the cold and hot airflows from the two ends of the vortex tube respectively. Usually, when the injected airflow is at room temperature, the temperature change of the cold air end of the vortex tube can reach -10 to -50°C, and the temperature of the hot air end of the vortex tube can reach 100 to 130°C. The temperature range can meet the needs of general high and low temperature tests. Therefore, the vortex tube is used as the high and low temperature heat source for the temperature field control test.

[0041] The temperature field control test system based on the vortex tube matrix of the present application constructs a vortex tube cooling matrix through the cold air end of the vortex tube, constructs a vortex tube heating matrix through the hot air end of the vortex tube, and uses a temperature control module of the control system to control the vortex tube. The vortex tube serves as a temperature application unit to generate a low-temperature or high-temperature temperature field in the test area. The temperature control module is used to control the temperature change of the vortex tube, and the control system is used to achieve closed-loop control of the vortex tube matrix temperature.

[0042] The temperature field control test system based on the vortex tube matrix of the present application controls the vortex tube switches and the vortex tube compressed gas flow in the corresponding temperature loading area through the temperature control module to achieve temperature regulation in the vortex tube matrix area, focusing on the temperature changes at the peak and valley values ​​of the temperature field curve. The regulation process can be completed in the shortest possible time, so that the uniformity of the temperature field converges within the index range and meets the test rate requirements.

[0043] The temperature field control test method and system based on the vortex tube matrix of the present application coordinates the temperature states between the matrices through the control system, and can meet the temperature field uniformity requirements by adjusting the temperature states of different matrices, as well as the temperature output characteristics of different vortex tubes in a single matrix, the spatial relative positions and other factors.

[0044] The temperature field control test method and system based on the vortex tube matrix of the present application, through the vortex tube matrix control technology, realizes the precise temperature control of the low temperature field in the test area by cooling and heating the compressed air through the vortex tube, reduces the test loss, and effectively improves the test economy. The present application is not only applicable to fatigue tests of military aircraft canopies, but also to other similar occasions, so it also has broad application prospects in the civilian field.

[0045] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A temperature field control test method based on a vortex tube matrix, characterized in that: include: Construct a vortex tube matrix; Performing temperature loading on the temperature loading area of ​​the test piece according to the vortex tube matrix, calibrating the vortex tube parameters according to the determined test parameters, and fitting a coefficient matrix; A temperature field control test is performed on the test piece according to the vortex tube matrix and the coefficient matrix.

2. The temperature field control test method based on the vortex tube matrix according to claim 1 is characterized in that: Construct a vortex tube matrix, including: A vortex tube cooling matrix is ​​constructed through the cold air end of the vortex tube; A vortex tube heating matrix is ​​constructed through the hot gas end of the vortex tube; The vortex tube cooling matrix and the vortex tube heating matrix are arranged crosswise to obtain a vortex tube matrix.

3. The temperature field control test method based on the vortex tube matrix according to claim 2 is characterized in that: The test parameters include the temperature loading area, the test minimum temperature, the test maximum temperature, the test heating rate, and the test cooling rate.

4. The temperature field control test method based on the vortex tube matrix according to claim 3 is characterized in that: The vortex tube parameters include the number of vortex tubes, the efficiency of the vortex tubes, and the distance between the vortex tubes and the temperature loading area.

5. The temperature field control test method based on the vortex tube matrix according to claim 4 is characterized in that: The vortex tube performance includes the minimum temperature and the maximum temperature that the vortex tube can reach.

6. The temperature field control test method based on the vortex tube matrix according to claim 5 is characterized in that: The test piece is provided with a plurality of temperature loading areas.

7. A temperature field control test system based on vortex tube matrix, characterized in that: include: A vortex tube, wherein the vortex tube has a vortex tube cold gas end and a vortex tube hot gas end; A control system controls the vortex tube switch and the vortex tube gas flow rate through a temperature control module.

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