CN113480897B - Bi-component pressure sensitive coating suitable for steady-state pressure measurement and data processing method thereof - Google Patents
Bi-component pressure sensitive coating suitable for steady-state pressure measurement and data processing method thereof Download PDFInfo
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- CN113480897B CN113480897B CN202110756168.5A CN202110756168A CN113480897B CN 113480897 B CN113480897 B CN 113480897B CN 202110756168 A CN202110756168 A CN 202110756168A CN 113480897 B CN113480897 B CN 113480897B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
- C09D133/16—Homopolymers or copolymers of esters containing halogen atoms
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- C—CHEMISTRY; METALLURGY
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/22—Luminous paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
- C09K11/77342—Silicates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
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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
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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Abstract
The invention discloses a bi-component pressure sensitive coating suitable for steady-state pressure measurement and a data processing method thereof, which are used for solving the problem of temperature correction in the steady-state pressure sensitive coating measurement. The formula of the coating comprises the following components in percentage by mass and volume: reference probe: adhesive: solvent 25 mg: 0.5 g: 12 g: 100 ml. Wherein the pressure-sensitive probe is PtTFPP (CAS: 109781-47-7); the reference probe is (BaSr)2SiO4:Eu2+. The reference probe in the formula has stable property, good temperature sensitivity and linearity and weak photodegradation; the cross interference between the reference probe and the pressure-sensitive probe is weak, and the fluorescence intensity of the coating with the same thickness is higher than that of the coating with other formulas; the coating has good film forming property and low surface roughness. The special data processing method is to calculate the ratio of the fluorescence intensity of the pressure-sensitive channel and the reference channel by the compensation power correction twice, and the compensation coefficient of the formula is 0.370.
Description
Technical Field
The invention belongs to the field of aerodynamic tests, and particularly relates to a bi-component pressure sensitive coating suitable for steady-state pressure measurement and a data processing method thereof.
Background
The pressure sensitive paint technology is a non-contact optical surface pressure measuring technology, and is used for measuring the surface pressure of a model in a wind tunnel test. The principle of the pressure sensitive coating is as follows: the pressure-sensitive probe molecule with the oxygen quenching effect emits fluorescence under the irradiation of exciting light with a certain wavelength, and the fluorescence intensity of the pressure-sensitive probe molecule is inversely proportional to the oxygen content around the pressure-sensitive probe molecule, namely the gas pressure. Pressure sensitive coatings are typically composed of pressure sensitive probes, binders, fillers, and solvents. Compared with the traditional contact type surface pressure measuring technology for forming pressure measuring holes on the surface of a model, the pressure sensitive coating has the advantages of non-contact, high spatial resolution, easiness in processing, low cost and the like.
Since the pressure sensitive probe molecules also have a thermal quenching effect, that is, the fluorescence intensity of the probe is also in inverse proportion to the temperature of the probe, measurement errors caused by uneven model temperature can occur in actual pressure measurement, which is called as a temperature effect, and therefore a novel pressure sensitive coating is needed.
Disclosure of Invention
Based on the defects, the invention provides the two-component pressure sensitive coating suitable for steady-state pressure measurement, which is used for solving the problem of temperature correction in the measurement of the steady-state pressure sensitive coating.
In order to achieve the purpose, the invention adopts the following technical scheme: a two-component pressure sensitive coating suitable for steady-state pressure measurement comprises the following components in percentage by mass: pressure sensitive probe: reference probe: adhesive: solvent 25 mg: 0.5 g: 12 g: 100 ml.
The invention also has the following technical characteristics:
1. the pressure-sensitive probe is PtTFPP (CAS: 109781-47-7).
2. The reference probe is (BaSr)2SiO4:Eu2+。
3. The adhesive is fluorine-containing acrylic resin, and the filler is TiO2The solvent is trifluorotoluene.
Another object of the present invention is to provide a data processing method applied to the above two-component pressure-sensitive paint, which is derived based on the fact that the photoluminescence intensity of the probe affected by thermal quenching effect follows Arrhenius relationship in a certain temperature range, and is used for correcting test data and eliminating temperature effect caused by the temperature sensitivity of the pressure-sensitive probe.
The method is a compensation power correction quadratic ratio of the fluorescence intensity of a pressure-sensitive channel and a reference channel, and the specific formula is as follows:
wherein Irr is a quadratic ratio, IRAnd IGFluorescence intensity, p and p, for pressure-sensitive and reference channels, respectively0Pressure at experiment and reference, t and t, respectively0Temperature, k, at experiment and reference, respectivelyTIs a compensation factor. For the present coating, kTIs 0.370.
The invention has the advantages and beneficial effects that: the principle of the invention is that a reference probe with temperature sensitive coefficient consistent with that of the pressure sensitive probe is added, the excitation wavelength of the reference probe is consistent with that of the fluorescent probe, and the emitted fluorescent wavelength is different from that of the pressure sensitive probe. The fluorescence of the pressure-sensitive probe and the fluorescence of the reference probe are respectively collected by a camera and compared, so that the influence of the temperature effect can be corrected. The reference probe has stable property, good temperature sensitivity and linearity and weak photodegradation; the cross interference between the reference probe and the pressure-sensitive probe is weak, and the fluorescence intensity of the coating is higher than that of the coating of other formulas under the same thickness. Meanwhile, the coating has the advantages of good film forming property and low surface roughness. In the formula of the data processing method of the inventionCompensation factor kTThe method is only related to the activation energy of the thermal quenching process, and has universality in a certain temperature range.
Drawings
FIG. 1 is a schematic diagram of the structure of a two-component pressure sensitive coating formulation suitable for steady state pressure measurement according to the present invention.
FIG. 2 is a schematic diagram of a wind tunnel test and calibration site system according to the present invention.
FIG. 3 is a graph of the pressure/temperature sensitivity of a paint sample calculated by the data processing method of the present invention.
Wherein, 1-pressure sensitive probe, 2-reference probe, 3-filler, 4-primer, 5-excitation light source, 6-color CCD/CMOS camera, 7-coating and 8-model surface.
Detailed Description
The detailed description of the embodiments of the present invention is provided in conjunction with the summary of the invention and the accompanying drawings.
Example 1
A two-component pressure sensitive paint suitable for steady-state pressure measurement comprises the following components in percentage by mass: a reference probe: adhesive: solvent 25 mg: 0.5 g: 12 g: 100 ml. Wherein the pressure-sensitive probe is PtTFPP (CAS: 109781-47-7); the reference probe is (BaSr)2SiO4:Eu2+(ii) a The adhesive is fluorine-containing acrylic resin; the filler is TiO2(ii) a The solvent is trifluorotoluene.
The coating formulation and application method was as follows:
the method comprises the following steps: according to the weight ratio of 25 mg: 0.5 g: 12 g: weighing a pressure-sensitive probe, a reference probe, a binder and a solvent according to a mass-to-volume ratio of 100ml, and placing the pressure-sensitive probe, the reference probe, the binder and the solvent in a special vessel of a ball mill;
step two: carrying out high-speed ball milling on the raw materials in a ball mill for about 40 minutes;
step three: uniformly spraying the primer on the model sprayed with the primer in advance by using an air spray gun within 30 minutes after the ball milling is finished, wherein the thickness of the coating is controlled to be 20-30 mu m;
step four: after the solvent is volatilized, the model is put into an oven, baked for two hours at 65 ℃ and naturally cooled.
Example 2
A data processing method of a bi-component pressure sensitive coating suitable for steady-state pressure measurement is characterized in that the method is used for secondarily solving the ratio of the fluorescence intensity of a pressure-sensitive channel and a reference channel in a compensation power correction mode, and the photoluminescence intensity influenced by a thermal quenching effect of a probe is deduced in a certain temperature range according to an Arrhenius relation. The concrete formula is as follows:
wherein Irr is a quadratic ratio, IRAnd IGFluorescence intensity, p and p, for pressure-sensitive and reference channels, respectively0Pressure at experiment and reference, t and t, respectively0Temperature, k, at experiment and reference, respectivelyTIs a compensation factor. For the present coating, kTIs 0.370.
The excitation light source is used to irradiate the coating on the surface of the model, and the coating emits fluorescence. Fluorescence was collected using a color camera CCD/CMOS camera as shown in FIG. 2. The pressure-sensitive probe of the formula emits red light because the emission peak is positioned at 650 nm; the reference probe emits green light when its emission peak is 525nm, so that the light intensity data of red channel and green channel of camera can respectively correspond to the fluorescent intensity I of pressure-sensitive channelRAnd reference channel fluorescence intensity IG。
Before the wind tunnel test, the coating calibration is carried out, and the coating is obtained according to formula (1)RAnd IGThe correspondence may calculate a pressure distribution of the model surface. The process of calibrating paint samples is described below.
The test flow is as follows:
the method comprises the following steps: the coating sample is placed in a constant-temperature constant-humidity airtight cabin, the pressure and the temperature in the cabin are changed according to a certain sequence, when the cabin is stable, an excitation light source is used for irradiating the coating of the sample, and a color camera CCD/CMOS camera is used for collecting fluorescence. Taking the example shown in FIG. 3, the calibration pressure range is 0.4-1.4 atm, and the temperature range is 10-40 ℃.
Step two: extracting I of camera data separatelyRAnd IGAt 1 atmosphere of pressure20 ℃ state as a reference state, i.e. (p)0,t0). To obtain IR(p0,t0) And IG(p0,t0)。
Step three: collecting I at each pressure and temperature pointR(p, t) and IG(p, t) Irr (p, t) is calculated by substituting in the formula (1). Irr (p, t) is plotted against pressure and temperature, as shown in FIG. 3. It can be seen that the pressure is positively correlated to Irr (p, t), which is not sensitive to temperature.
Claims (2)
1. A two-component pressure sensitive coating suitable for steady-state pressure measurement is characterized in that the components of the formula are as follows according to mass-volume ratio: pressure sensitive probe: a reference probe: adhesive: solvent 25 mg: 0.5 g: 12 g: 100 ml; the pressure-sensitive probe is PtTFPP (CAS: 109781-47-7); the reference probe is (BaSr)2SiO4:Eu2+(ii) a The adhesive is fluorine-containing acrylic resin, and the solvent is trifluorotoluene.
2. A data processing method applied to the two-component pressure sensitive coating suitable for steady state pressure measurement according to claim 1, wherein: the method is a compensation power correction quadratic ratio of the fluorescence intensity of a pressure-sensitive channel and a reference channel, and the specific formula is as follows:
wherein Irr is a quadratic ratio, IRAnd IGFluorescence intensity, p and p, for pressure-sensitive and reference channels, respectively0Pressure at experiment and reference, t and t, respectively0Temperature, k, at experiment and reference, respectivelyTTo compensate for the coefficient, kTIs 0.370.
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| JP2005029767A (en) * | 2003-07-11 | 2005-02-03 | National Aerospace Laboratory Of Japan | Pressure/temperature sensitive composite functional paint |
| JP2008286564A (en) * | 2007-05-16 | 2008-11-27 | Japan Aerospace Exploration Agency | Compound molecular sensor |
| CN106501227A (en) * | 2016-10-25 | 2017-03-15 | 中国航空工业集团公司沈阳空气动力研究所 | Measuring method based on pressure sensitive coating probe molecule fluorescence lifetime |
| JP2017219397A (en) * | 2016-06-07 | 2017-12-14 | 国立研究開発法人宇宙航空研究開発機構 | Pressure sensitive coating material, pressure sensitive sensor, pressure measuring device, measuring method, and program |
| CN109517472A (en) * | 2018-11-29 | 2019-03-26 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of double component steady state pressure sensitive coatings and the preparation method and application thereof |
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| JP2005029767A (en) * | 2003-07-11 | 2005-02-03 | National Aerospace Laboratory Of Japan | Pressure/temperature sensitive composite functional paint |
| JP2008286564A (en) * | 2007-05-16 | 2008-11-27 | Japan Aerospace Exploration Agency | Compound molecular sensor |
| JP2017219397A (en) * | 2016-06-07 | 2017-12-14 | 国立研究開発法人宇宙航空研究開発機構 | Pressure sensitive coating material, pressure sensitive sensor, pressure measuring device, measuring method, and program |
| CN106501227A (en) * | 2016-10-25 | 2017-03-15 | 中国航空工业集团公司沈阳空气动力研究所 | Measuring method based on pressure sensitive coating probe molecule fluorescence lifetime |
| CN109517472A (en) * | 2018-11-29 | 2019-03-26 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of double component steady state pressure sensitive coatings and the preparation method and application thereof |
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