CN110686798A - Device and method for testing surface temperature uniformity of bottom plate of wind tunnel test section - Google Patents
Device and method for testing surface temperature uniformity of bottom plate of wind tunnel test section Download PDFInfo
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- CN110686798A CN110686798A CN201911190515.1A CN201911190515A CN110686798A CN 110686798 A CN110686798 A CN 110686798A CN 201911190515 A CN201911190515 A CN 201911190515A CN 110686798 A CN110686798 A CN 110686798A
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- 238000012360 testing method Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 92
- 239000013307 optical fiber Substances 0.000 claims abstract description 32
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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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
- G01M9/04—Details
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Abstract
The invention provides a device and a method for testing the surface temperature uniformity of a bottom plate of a wind tunnel test section, wherein the scheme comprises a bottom plate, an optical fiber, a fiber bragg grating signal demodulator and an upper computer; the optical fibers have k, and k is a natural number which is not 0; the k optical fibers are arranged on the bottom plate block in parallel; n fiber gratings with different reflection center wavelengths are etched on each optical fiber, the n fiber gratings form a fiber grating string, and n is a natural number different from 0; each fiber grating is encapsulated by a heat-conducting substrate; all the fiber bragg grating strings are connected with a fiber bragg grating signal demodulator; the fiber grating signal demodulator is in data communication with the upper computer through a data line. The scheme can accurately and effectively test the temperature uniformity of the surface of the bottom plate of the wind tunnel test section, is simple in wiring, convenient to maintain and strong in anti-interference capability, and is not influenced by the wind tunnel environment and gas flow.
Description
Technical Field
The invention relates to the technical field of temperature testing, in particular to a device and a method for testing the surface temperature uniformity of a bottom plate of a wind tunnel test section.
Background
In the wind tunnel test process of some special wind tunnels and environmental wind tunnels, the temperature distribution condition of the bottom plate surface of the wind tunnel test section has important influence on the flow field quality, the environmental simulation, the parameter analysis and the like of the blowing test. Therefore, it is very important to accurately obtain the temperature distribution uniformity of the bottom plate surface of the wind tunnel test section. At present, there are two main ways to test the temperature uniformity of the bottom plate surface of the wind tunnel test section.
One way is to use the conventional electric temperature sensor Pt100 to perform testing, which is to uniformly arrange a plurality of Pt100 on the surface of the bottom plate of the test section and connect the Pt100 by using a cable, and perform excitation and signal transmission on the Pt100, thereby realizing the measurement of the temperature of the bottom plate, and this way causes a very complicated wiring process and difficulty in later maintenance due to the need of cable connection on each Pt100 on the bottom plate of the wind tunnel. In addition, aiming at the special environment of the wind tunnel, the sensor is in a complex electromagnetic environment during the blowing test, and the electromagnetic environment can cause serious interference to a weak electric signal of the sensor, so that the measurement error is very large, and the requirement of the test precision is not met.
The other mode is to use non-contact temperature sensors such as infrared sensors to carry out testing, and the infrared temperature sensing images are shot through the infrared sensors to measure the temperature of the bottom plate of the test section. Because the infrared sensor in the method is usually installed at a certain distance from the bottom plate of the wind tunnel test section, the captured infrared temperature sensing image not only comprises the temperature of the bottom plate of the wind tunnel test section, but also comprises the gas temperature between the infrared sensor and the bottom plate of the wind tunnel test section, so that the test method is very easily influenced by the use environment. In addition, in the wind tunnel blowing test process, gas can flow rapidly, so that the measured temperature image is a temperature cloud and cannot be used for representing the temperature of the wind tunnel bottom plate.
Disclosure of Invention
The invention aims to provide a technical scheme of a device and a method for testing the surface temperature uniformity of a bottom plate of a wind tunnel test section, aiming at the defects in the prior art.
The scheme is realized by the following technical measures:
the utility model provides a wind tunnel test section bottom plate surface temperature homogeneity testing arrangement which characterized by: comprises a bottom plate, an optical fiber, a fiber bragg grating signal demodulator and an upper computer; the optical fibers have k, and k is a natural number which is not 0; the k optical fibers are arranged on the bottom plate block in parallel; n fiber gratings with different reflection center wavelengths are etched on each optical fiber, the n fiber gratings form a fiber grating string, and n is a natural number different from 0; all the fiber bragg grating strings are connected with a fiber bragg grating signal demodulator; the fiber grating signal demodulator is in data communication with the upper computer through a data line.
The scheme is preferably as follows: each fiber grating is encapsulated by a heat conducting substrate.
The scheme is preferably as follows: the data line is a network cable or a serial port line or a USB connecting line.
The scheme is preferably as follows: the position of the fiber grating is positioned on the position of a temperature measuring point of the bottom plate block.
The scheme is preferably as follows: the bottom of the heat conducting substrate is provided with a channel; heat conducting paste is filled in the channel; the fiber grating is packaged in the channel; the heat conducting substrate is adhered to the position of the temperature measuring point of the bottom plate block through an adhesive.
A method for testing the surface temperature uniformity of a bottom plate of a wind tunnel test section comprises the following steps:
a. determining the position of a temperature measuring point on the bottom plate block;
b. laying a plurality of optical fibers on a bottom plate block, arranging an optical fiber grating at the position of each temperature measuring point, and forming an optical fiber grating string by the optical fiber gratings on each optical fiber;
c. connecting all fiber grating strings to a multi-channel fiber grating signal demodulator, wherein each fiber grating string corresponds to one channel of the fiber grating signal demodulator, and each channel simultaneously demodulates N fiber grating signals on the channel; the fiber grating signal demodulator accurately analyzes the temperature of any temperature measuring point position on the bottom plate block according to the channel number, the reflected wave band and the deviation value of the reflected wave center wavelength;
d. and connecting the fiber bragg grating signal demodulator with an upper computer, and finally obtaining the temperature uniformity index of the surface of the bottom plate of the wind tunnel test section through the processing of the upper computer.
The scheme is preferably as follows: the specific operation method of the step a comprises the following steps: uniformly dividing a bottom plate testing area of the wind tunnel testing section into X rectangular bottom plate blocks according to the size requirement of the bottom plate temperature testing area of the wind tunnel testing section; then, according to the area of the bottom plate block and the requirement of temperature testing density, setting M multiplied by N temperature testing point positions on the surface of the bottom plate block at equal intervals, wherein the value range of M is as follows: 1-16, wherein the value range of N is as follows: 1-15; and finally, arranging the M multiplied by N temperature measuring point positions into M rows and N columns.
The scheme is preferably as follows: the specific operation method of the step b is as follows: preparing M optical fibers, and simultaneously etching N fiber gratings reflecting different central wavelengths on each optical fiber according to the distance between the N temperature measuring point positions on each row on the bottom plate block to form a one-line multipoint distributed measuring fiber grating string; then, correspondingly installing the fiber bragg grating strings on the positions of temperature measuring points on the surface of the bottom plate block; finally, M fiber bragg grating strings form an MxN fiber bragg grating temperature measurement array.
The scheme is preferably as follows: the specific operation method of the step d is as follows: the fiber bragg grating signal demodulator is connected with the upper computer through a network cable and used for demodulating reflected wavelength information of a fiber bragg grating temperature measurement array in the channel and then uploading demodulated data to the upper computer through the network cable; then, the upper computer performs digital filtering and gross error processing on the demodulated data, so as to obtain temperature data of M multiplied by N temperature measuring point positions on the bottom plate block; and finally, carrying out interpolation processing on the temperature data of all the bottom plate blocks to obtain a temperature cloud chart of the bottom plate of the whole wind tunnel test section, and further obtaining the temperature uniformity index of the surface of the bottom plate of the wind tunnel test section.
The scheme is preferably as follows: each fiber grating is encapsulated by a heat-conducting substrate; the heat conducting substrate is made of metal material with good heat conductivity.
The beneficial effects of the scheme can be known from the description of the scheme, and the beneficial effects of the invention are as follows:
① the invention etches a plurality of fiber grating temperature measuring points reflecting different central wavelengths on a fiber simultaneously to form a fiber grating string of one-line multi-point distributed measurement, and a fiber grating temperature measuring array is formed by a plurality of fiber grating strings to test the temperature uniformity of the surface of the bottom plate of the wind tunnel test section.
② the invention uses the heat conducting substrate to package the fiber grating temperature measuring point, the temperature change gradient near the installation position of the fiber grating temperature measuring point can be reduced obviously by the packaging method, the temperature near the installation channel of the fiber grating temperature measuring point is approximately equal to the temperature of the surface of the bottom plate of the tested wind tunnel test section.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a heat conductive substrate.
In the figure, 1 is a bottom plate block, 2 is a fiber grating, 3 is a fiber grating string, 4 is a fiber grating signal demodulator, 5 is a network cable, 6 is an upper computer, 7 is a heat conducting substrate, and 8 is a channel.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As can be seen from fig. 1 and 2, the scheme includes a bottom plate block, an optical fiber, a fiber bragg grating signal demodulator and an upper computer; the optical fibers have k, and k is a natural number which is not 0; the k optical fibers are arranged on the bottom plate block in parallel; n fiber gratings with different reflection center wavelengths are etched on each optical fiber, the n fiber gratings form a fiber grating string, and n is a natural number different from 0; all the fiber bragg grating strings are connected with a fiber bragg grating signal demodulator; the fiber grating signal demodulator is in data communication with the upper computer through a data line. Each fiber grating is encapsulated by a thermally conductive substrate. The data line is a network cable or a serial port line or a USB connecting line. The position of the fiber grating is positioned on the position of a temperature measuring point of the bottom plate block. The bottom of the heat conducting substrate is provided with a channel; heat conducting paste is filled in the channel; the fiber grating is packaged in the channel; the heat conducting substrate is adhered to the position of the temperature measuring point of the bottom plate block through an adhesive.
Example (b):
in this embodiment, the temperature uniformity of the surface of the bottom plate of a certain wind tunnel test section is tested, the material of the bottom plate of the test section is 304 stainless steel, the surface temperature range is-10 ℃ to +112 ℃, and the temperature uniformity requirement is better than +/-0.5 ℃.
Firstly, uniformly dividing a bottom plate of a wind tunnel test section into 8 bottom plate blocks, wherein the size of each bottom plate block is 3000mm multiplied by 3000mm, and presetting 121 temperature measuring point positions on the surface of each bottom plate block to form an 11 multiplied by 11 array, wherein the distance between the temperature measuring point positions is 250 mm. Then, 11 optical fibers are prepared, and 11 fiber gratings reflecting different central wavelengths are etched on each optical fiber, each fiber grating respectively occupying a different band with a bandwidth of 2 nm. After all the fiber bragg gratings 2 are etched, 11 fiber bragg grating strings are correspondingly arranged on the positions of temperature measuring points on the surface of the bottom plate block 1 to form a 11 x 11 fiber bragg grating temperature measuring array, and all the fiber bragg gratings are packaged and fixed by using a heat conducting substrate. Then, a 16-channel fiber grating signal demodulator is used to connect the whole fiber grating temperature measurement array, the demodulation frequency of the fiber grating signal demodulator is set to be 10Hz, each fiber grating string is correspondingly connected with one channel of the fiber grating signal demodulator, and each channel simultaneously demodulates 11 fiber grating signals on the channel. After demodulating the reflected wavelength information of the fiber bragg grating temperature measurement array in the channel by the fiber bragg grating signal demodulator, uploading the demodulated data to an upper computer through a network cable, and performing digital filtering and coarse error processing on the demodulated data by the upper computer to obtain the temperature data of 121 temperature measurement point positions on the bottom plate block. And finally, carrying out interpolation processing on all the temperature data of the 8 bottom plate blocks to obtain a temperature cloud chart of the surface of the bottom plate of the whole wind tunnel test section, and further obtaining a temperature uniformity index of the surface of the bottom plate of the wind tunnel test section.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. The utility model provides a wind tunnel test section bottom plate surface temperature homogeneity testing arrangement which characterized by: comprises a bottom plate, an optical fiber, a fiber bragg grating signal demodulator and an upper computer; the optical fibers have k, and k is a natural number which is not 0; the k optical fibers are arranged on the bottom plate block in parallel; n fiber gratings with different reflection center wavelengths are etched on each optical fiber, the n fiber gratings form a fiber grating string, and n is a natural number different from 0; all the fiber bragg grating strings are connected with a fiber bragg grating signal demodulator; and the fiber grating signal demodulator is in data communication with an upper computer through a data line.
2. The wind tunnel test section bottom plate surface temperature uniformity testing device according to claim 1, characterized in that: each fiber grating is encapsulated by a heat conducting substrate.
3. The wind tunnel test section bottom plate surface temperature uniformity testing device according to claim 1, characterized in that: the data line is a network cable or a serial port line or a USB connecting line.
4. The wind tunnel test section bottom plate surface temperature uniformity testing device according to claim 1, characterized in that: the position of the fiber grating is positioned on the position of a temperature measuring point of the bottom plate block.
5. The device for testing the surface temperature uniformity of the bottom plate of the wind tunnel test section according to claim 1 or 2, which is characterized in that: the bottom of the heat conducting substrate is provided with a channel; the channel is filled with heat conducting paste; the fiber grating is packaged in the channel; the heat conducting substrate is adhered to the position of the temperature measuring point of the bottom plate block through an adhesive.
6. A method for testing the surface temperature uniformity of a bottom plate of a wind tunnel test section is characterized by comprising the following steps: the method comprises the following steps:
a. determining the position of a temperature measuring point on the bottom plate block;
b. laying a plurality of optical fibers on a bottom plate block, arranging an optical fiber grating at the position of each temperature measuring point, and forming an optical fiber grating string by the optical fiber gratings on each optical fiber;
c. connecting all fiber grating strings to a multi-channel fiber grating signal demodulator, wherein each fiber grating string corresponds to one channel of the fiber grating signal demodulator, and each channel simultaneously demodulates N fiber grating signals on the channel; the fiber grating signal demodulator accurately analyzes the temperature of any temperature measuring point position on the bottom plate block according to the channel number, the reflected wave band and the deviation value of the reflected wave center wavelength;
d. and connecting the fiber bragg grating signal demodulator with an upper computer, and finally obtaining the temperature uniformity index of the surface of the bottom plate of the wind tunnel test section through the processing of the upper computer.
7. The method of claim 6, wherein: the specific operation method of the step a comprises the following steps: uniformly dividing a bottom plate testing area of the wind tunnel testing section into X rectangular bottom plate blocks according to the size requirement of the bottom plate temperature testing area of the wind tunnel testing section; then, according to the area of the bottom plate block and the requirement of temperature testing density, setting M multiplied by N temperature testing point positions on the surface of the bottom plate block at equal intervals, wherein the value range of M is as follows: 1-16, wherein the value range of N is as follows: 1-15; and finally, arranging the M multiplied by N temperature measuring point positions into M rows and N columns.
8. The method of claim 6, wherein: the specific operation method of the step b is as follows: preparing M optical fibers, and simultaneously etching N fiber gratings reflecting different central wavelengths on each optical fiber according to the distance between the N temperature measuring point positions on each row on the bottom plate block to form a one-line multipoint distributed measuring fiber grating string; and finally, M fiber grating strings form an MXN fiber grating temperature measurement array.
9. The method of claim 6, wherein: the specific operation method of the step d comprises the following steps: the fiber bragg grating signal demodulator is connected with the upper computer through a network cable and used for demodulating reflected wavelength information of a fiber bragg grating temperature measurement array in the channel and then uploading demodulated data to the upper computer through the network cable; then, the upper computer performs digital filtering and gross error processing on the demodulated data, so as to obtain temperature data of M multiplied by N temperature measuring point positions on the bottom plate block; and finally, carrying out interpolation processing on the temperature data of all the bottom plate blocks to obtain a temperature cloud chart of the bottom plate of the whole wind tunnel test section, and further obtaining the temperature uniformity index of the surface of the bottom plate of the wind tunnel test section.
10. The method of claim 6, wherein: each fiber grating is encapsulated by a heat-conducting substrate; the heat conducting substrate is made of a metal material with good heat conductivity.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113670558A (en) * | 2021-08-30 | 2021-11-19 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Optical fiber quick positioning method for wind tunnel cold leakage monitoring |
| CN113720573A (en) * | 2021-08-30 | 2021-11-30 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Wind tunnel cold leakage monitoring system based on vision and distributed optical fiber combined temperature measurement |
| CN116718065A (en) * | 2023-08-09 | 2023-09-08 | 中国空气动力研究与发展中心高速空气动力研究所 | Water-cooling pipeline installation method for controlling air temperature uniformity of large continuous wind tunnel |
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| CN113720573A (en) * | 2021-08-30 | 2021-11-30 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Wind tunnel cold leakage monitoring system based on vision and distributed optical fiber combined temperature measurement |
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| CN116718065A (en) * | 2023-08-09 | 2023-09-08 | 中国空气动力研究与发展中心高速空气动力研究所 | Water-cooling pipeline installation method for controlling air temperature uniformity of large continuous wind tunnel |
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