Heat flux measurement and correction method for thermal test of ablation specimens

Abstract

The present invention provides a method for measuring and correcting heat flux in thermal tests of ablative test pieces, including arranging a heat flux test installation position, installing a debugging tool for arranging a heat flux correction installation position at the test piece installation position; installing two heat flux meters to corresponding positions, setting the first heat flux meter as a heat flux control point, and setting the second heat flux meter as a heat flux monitoring point; recording the test data of the first heat flux meter and the second heat flux meter and correcting the heat flux loading spectrum to obtain a correction coefficient; correcting the heat flux loading spectrum according to the correction coefficient to obtain the heat flux correction loading spectrum at the test installation position; adjusting the two heat flux meters to carry out a secondary preliminary test, recording the test data; comparing the test data until they match; installing the ablative test piece, and carrying out a formal test. The present invention solves the problem that when ablative test pieces carry out thermal tests, the received heat flux within the test piece size range cannot be normally and accurately collected due to the large amount of smoke and dust in the surrounding area of ​​the test piece, and greatly improves the success rate of thermal tests of ablative test pieces completed in one time.

Description

Technical Field

[0001] The present invention relates to the field of pneumatic thermal simulation tests, and in particular to a method for measuring and correcting heat flow in thermal tests of ablation-type test pieces using quartz lamps. Background Art

[0002] As the flight Mach number of missiles and arrows increases, the peak value of aerodynamic heating heat flux becomes larger and larger, and the instantaneous temperature rise rate becomes higher and higher, and the demand for heat protection of products becomes more and more urgent. Ablation insulation is a widely used heat protection method, and its application in the aerospace field has become more and more extensive in recent years.

[0003] In the field of ground test engineering for aerospace products, the demand for thermal testing of ablative products is increasing. During the heating test of ablative products, it is necessary to use certain heating means to heat the ablative products and adjust the amount of heating according to the feedback value of the heat flux sensor to achieve the heat flux density loading environment required by the test.

[0004] In the process of conducting thermal tests on ablative products, a large amount of smoke and flames will be generated. In the past, the heat flux measurement scheme used in quartz lamp thermal tests on test piece-level products was to place the heat flux meter close to the test piece installation position, and it was approximately assumed that the received heat flux at the heat flux installation position was the received heat flux on the test piece surface. However, in the process of conducting thermal tests on ablative test pieces, the smoke generated will most likely cause the heat flux meter lens to become dirty and clogged, resulting in test failure. Simply increasing the distance between the heat flux meter installation position and the test piece installation position will introduce a large error to the test, resulting in under-assessment or over-assessment.

[0005] In order to solve the deficiencies of the prior art, the present invention intends to design a method for measuring and correcting heat flow in thermal tests of ablation specimens, so that thermal tests of ablation products can be effectively carried out. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a method for measuring and correcting heat flow in thermal tests of ablation specimens.

[0007] A method for measuring and correcting heat flow in thermal tests of ablation specimens provided by the present invention comprises the following steps:

[0008] Step S1: Arrange a heat flow test installation position and a test piece installation position on the heat insulation tooling, and install a debugging tooling for arranging a heat flow correction installation position at the test piece installation position;

[0009] Step S2: using two heat flow meters, with the first heat flow meter installed at the heat flow correction installation position and the second heat flow meter installed at the heat flow test installation position, setting the first heat flow meter as the heat flow control point and setting the second heat flow meter as the heat flow monitoring point;

[0010] Step S3: conducting a preliminary test according to a given loading spectrum, and recording test data of the first heat flow meter and the second heat flow meter;

[0011] Step S4: Correcting the heat flux loading spectrum according to the test data obtained by the second heat flux meter to obtain a correction coefficient;

[0012] Step S5: Correcting the heat flux loading spectrum according to the correction coefficient to obtain the heat flux correction loading spectrum at the test installation position;

[0013] Step S6: The first heat flow meter is installed at the heat flow correction installation position, the second heat flow meter is installed at the heat flow test installation position, the first heat flow meter is set as the heat flow monitoring point, and the second heat flow meter is set as the heat flow control point;

[0014] Step S7: Carry out a secondary preliminary test according to the heat flow correction loading spectrum, and record the test data of the first heat flow meter and the second heat flow meter;

[0015] Step S8: comparing the test data of the first heat flow meter in the two preliminary tests to see if they are consistent, and if there is a deviation, continuing to correct the heat flow loading spectrum line;

[0016] Step S9: installing the second heat flow meter at the test installation position, setting it as the heat flow control point, inputting the heat flow correction loading spectrum line, and using it as the control spectrum line;

[0017] Step S10: Install the ablation test piece at the test piece installation position and conduct a formal test.

[0018] Preferably, in step S1, the heat flux test installation position and the heat flux correction installation position are both used to arrange and install a heat flux meter.

[0019] Preferably, in step S1, the heat flux correction installation position is located at the center of the debugging tool.

[0020] Preferably, in step S1, the distance between the heat flow test installation position and the lower edge of the test piece installation position is ≥100 mm.

[0021] Preferably, in step S4, the method of correcting the heat flux loading spectrum according to the test data obtained by the second heat flux meter is to correct each peak item in the heat flux loading spectrum according to the measurement value of the second heat flux meter without correcting the time item.

[0022] Preferably, in step S3 and step S7, the installation positions of the first heat flow meter and the second heat flow meter are not interchangeable.

[0023] Preferably, when conducting the test, the distance between the heat source lamp array and the thermal insulation tooling is ≥100 mm.

[0024] Preferably, the area of ​​the heat source lamp array is twice as large as the test piece.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention solves the problem that when conducting thermal tests on ablative specimens, the heat flow within the size range of the specimen cannot be accurately collected due to heavy smoke and dust in the surrounding area of ​​the specimen, and provides a solution for heat flow control for conducting thermal tests on ablative specimens.

[0027] 2. The present invention greatly improves the success rate of completing the thermal test of the ablation specimen in one time, effectively avoids the dirtying and clogging of the heat flux meter lens caused by smoke and dust, and effectively avoids over-testing.

[0028] 3. The present invention is applicable to various types of ablation test pieces quartz lamp thermal tests, and has a positive role in improving test and production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 A schematic diagram of the position of the heat flow measurement and correction method for thermal testing of ablation specimens provided by the present invention;

[0031] Figure 2 This is a schematic flow chart of the heat flow measurement and correction method for thermal testing of ablation specimens provided by the present invention. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] like Figure 1 and Figure 2 As shown, a method for measuring and correcting heat flow in thermal tests of ablation specimens according to the present invention comprises the following steps:

[0034] (1) The heat flux test installation position is arranged at the position shown in the thermal insulation tooling, and a debugging tooling for arranging the heat flux correction installation position is installed at the test piece installation position;

[0035] (2) using two heat flow meters, wherein the first heat flow meter is installed at the correction installation position, and the second heat flow meter is installed at the test installation position, setting the first heat flow meter as the heat flow control point, and setting the second heat flow meter as the heat flow monitoring point;

[0036] (3) Carry out preliminary tests based on the given loading spectrum and record the test data of the first heat flow meter and the second heat flow meter;

[0037] (4) Correcting the heat flux loading spectrum according to the test data obtained by the second heat flux meter to obtain a correction coefficient;

[0038] (5) Correcting the heat flux loading spectrum according to the correction coefficient to obtain the heat flux corrected loading spectrum at the test installation position;

[0039] (6) The first heat flow meter is installed in the correction installation position, and the second heat flow meter is installed in the test installation position. The first heat flow meter is set as the heat flow monitoring point, and the second heat flow meter is set as the heat flow control point;

[0040] (7) Carry out a secondary preliminary test according to the heat flux correction loading spectrum and record the test data of the first heat flux meter and the second heat flux meter;

[0041] (8) Compare the test data of the first heat flow meter in the two preliminary tests to see if they are consistent. If there is a deviation, continue to correct the heat flux loading spectrum;

[0042] (9) Install the second heat flow meter at the test installation position, set it as the heat flow control point, input the heat flow correction loading spectrum, and use it as the control spectrum;

[0043] (10) Install the ablation test piece at the test piece installation position and conduct formal testing.

[0044] In the step (1), both the heat flux test installation position and the heat flux correction installation position are used to arrange and install the heat flux meter; the heat flux correction installation position is located at the center of the debugging tooling; the heat flux test installation position is located at a distance of ≥100 mm from the lower edge of the test piece installation position to ensure that the smoke, dust, flame, etc. generated during the test will not affect the operation of the heat flux meter.

[0045] In the step (4), the method for correcting the heat flux loading spectrum according to the test data obtained by the second heat flux meter is to correct each peak item in the heat flux loading spectrum according to the measurement value of the second heat flux meter without correcting the time item.

[0046] During the two preliminary tests in steps (3) and (7), the installation positions of the heat flow meters cannot be interchanged to avoid errors caused by sensor sensitivity.

[0047] When conducting the test, the distance between the heat source lamp array and the thermal insulation tooling is ≥100mm to ensure that the smoke, dust, flames, etc. generated during the test will not affect the operation of the heat source element.

[0048] The area of ​​the heat source lamp array must be at least twice as large as the test piece to ensure uniformity of heat flow on the surface of the test piece.

[0049] In the description of the present application, it should be understood that the terms "up", "down", "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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for measuring and correcting heat flow in thermal tests of ablation specimens, characterized in that: The steps include: Step S1: Arrange a heat flux test installation position and a test piece installation position on the heat insulation tooling, and install a debugging tooling for arranging a heat flux correction installation position at the test piece installation position; Step S2: using two heat flow meters, with the first heat flow meter installed at the heat flow correction installation position and the second heat flow meter installed at the heat flow test installation position, setting the first heat flow meter as the heat flow control point and setting the second heat flow meter as the heat flow monitoring point; Step S3: Conduct a preliminary test according to a given heat flux loading spectrum, and record the test data of the first heat flux meter and the second heat flux meter; Step S4: Correcting the heat flux loading spectrum according to the test data obtained by the second heat flux meter to obtain a correction coefficient; Step S5: Correcting the heat flux loading spectrum according to the correction coefficient to obtain the heat flux correction loading spectrum at the heat flux test installation position; Step S6: The first heat flow meter is installed at the heat flow correction installation position, the second heat flow meter is installed at the heat flow test installation position, the first heat flow meter is set as the heat flow monitoring point, and the second heat flow meter is set as the heat flow control point; Step S7: Carry out a secondary preliminary test according to the heat flow correction loading spectrum, and record the test data of the first heat flow meter and the second heat flow meter; Step S8: comparing the test data of the first heat flow meter in the two preliminary tests to see if they are consistent, and if there is a deviation, continuing to correct the heat flow loading spectrum line; Step S9: installing the second heat flux meter at the heat flux test installation position, setting it as the heat flux control point, inputting the heat flux correction loading spectrum line, and using it as the control spectrum line; Step S10: Install the ablation test piece at the test piece installation position and conduct a formal test.

2. The method for measuring and correcting heat flux in thermal tests of ablation specimens according to claim 1, characterized in that: In the step S1, the heat flux test installation position and the heat flux correction installation position are both used to arrange and install the heat flux meter.

3. The method for measuring and correcting heat flux in thermal tests of ablation specimens according to claim 1, characterized in that: In the step S1, the heat flux correction installation position is located at the center of the debugging tool.

4. The method for measuring and correcting heat flux in thermal tests of ablation specimens according to claim 1, characterized in that: In the step S1, the distance between the heat flow test installation position and the lower edge of the test piece installation position is ≥100 mm.

5. The method for measuring and correcting heat flux in thermal tests of ablation specimens according to claim 1, characterized in that: In step S4, the method of correcting the heat flux loading spectrum according to the test data obtained by the second heat flux meter is to correct each peak item in the heat flux loading spectrum according to the measurement value of the second heat flux meter without correcting the time item.

6. The method for measuring and correcting heat flux in thermal tests of ablation specimens according to claim 1, characterized in that: In step S3 and step S7, the installation positions of the first heat flow meter and the second heat flow meter are not interchangeable.

7. The heat flux measurement and correction method for thermal testing of ablation specimens according to claim 1, characterized in that: It also includes a heat source lamp array. When conducting the test, the distance between the heat source lamp array and the thermal insulation tooling is ≥100mm.

8. The heat flux measurement and correction method for thermal testing of ablation specimens according to claim 7, characterized in that: The area of ​​the heat source lamp array is twice that of the ablation test piece.

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