CN110987356A - Formula and using method of colored oil flow suitable for subsonic velocity temporary flushing wind tunnel - Google Patents
Formula and using method of colored oil flow suitable for subsonic velocity temporary flushing wind tunnel Download PDFInfo
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- CN110987356A CN110987356A CN201911241578.5A CN201911241578A CN110987356A CN 110987356 A CN110987356 A CN 110987356A CN 201911241578 A CN201911241578 A CN 201911241578A CN 110987356 A CN110987356 A CN 110987356A
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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
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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Abstract
The invention discloses a color oil flow formula suitable for subsonic velocity temporary wind tunnel and a use method thereof, the formula comprises a carrier, a diluent and a filler, and the mass ratio of the components is as follows: diluent agent: filler 5: 2: 3. the formula can form a clear oil flow line under the environment of a temporary-impulse wind tunnel. After fine proportioning, the obtained oil spectrum has better curing degree and is not easy to be blown by the recoil airflow stopped by the wind tunnel to disturb the oil spectrum. The proportioning is simple, convenient and quick, and the cost is low.
Description
Technical Field
The invention relates to the technical field of color oil flow tests, in particular to a color oil flow formula suitable for a subsonic velocity temporary flushing wind tunnel.
Background
In the wind tunnel test technology, the color oil flow test technology is a relatively mature and common test technology, an oil film containing fine tracer particles is coated on the surface of a model, and when the wind tunnel test is carried out, the shear stress formed by airflow on the boundary layer of the model surface pushes the oil film to make viscous motion, so that an oil flow spectrum is formed. The oil flow test technology applied to the conventional wind tunnel test generally adopts white titanium dioxide powder (titanium dioxide) as tracer particles (which can be called as the conventional oil flow test technology) to display the flow state of the model surface.
Aiming at a high-speed temporary-flushing wind tunnel, in the oil flow test, the time from oil painting to oil flow spectrum acquisition generally needs to be 5-8 minutes, wherein the preparation time for closing and opening a hole before air blowing is about 4-6 minutes, the time for establishing a flow field and blowing later can be manually controlled, generally is 1-2 minutes, the surface temperature of a model can be reduced by 15-20 ℃ after the air blowing is finished, and ideally, the viscosity of the whole oil film is increased after painting until the temperature is lowest when the air blowing is nearly finished, the viscosity of the oil film is enabled to reach the maximum state after the solvent is basically volatilized, and the clear oil spectrum is formed through solidification.
However, different wind tunnel operation types, different temperature environments and different incoming flow mach numbers can cause the viscosity of the oil film to fluctuate greatly, so that the finally obtained oil spectrum has larger difference, and the judgment of test analysts on the surface flow field structure of the model is influenced.
Disclosure of Invention
Object of the Invention
In order to solve the technical problems, the invention discloses a color oil flow formula suitable for a subsonic velocity temporary wind tunnel and a use method thereof.
Technical solution of the invention
In order to achieve the purpose, the invention adopts the following technical scheme:
a color oil flow formula suitable for subsonic velocity temporary wind tunnels comprises a carrier, a diluent and a filler, wherein the carrier comprises the following components in percentage by mass: diluent agent: filler 5: 2: 3.
preferably, the carrier is methyl silicone oil with 2000cs viscosity. The oil flow trace formed by the silicone oil with the too low viscosity in the blowing process is too fine and dense, so that an intermittent trace is easy to appear, the oil flow trace is not easy to solidify, the effect is not good, the silicone oil with the too high viscosity is not easy to blow, and the trace can be formed only by blowing for a long time.
Preferably, the diluent is aviation kerosene.
Preferably, the filler is mineral powder with the particle size of 100 nm-5 um. The filler with the too small particle size is not easy to generate filler aggregation to form a trace, the filler with the smaller particle size can be used for fluorescent oil flow, but the fluorescent oil flow generally does not generate filler aggregation and can not form a raised trace, and the excessive particle size can cause the oil film to be too thick to influence the airflow flow on the surface of the model.
The use method of the colored oil flow formula comprises the following steps:
firstly, estimating and determining the oil consumption of the colorful oil flow test according to the test area of the model oil flow area to be tested.
Secondly, according to the determined oil amount of the color oil flow test, an electronic balance, a beaker and other auxiliary appliances are used in a laboratory, and the oil material for the color oil flow test is prepared according to a color oil flow formula, wherein all raw materials comprise methyl silicone oil with the viscosity of 2000CS, mineral powder with the particle size of 100 nm-5 um and aviation kerosene, and the mass ratio of the preparation is 5: 2: and 3, after the preparation of the color oil flow oil is finished, sealing the opening of the beaker by using a sealing film.
And before formal test, removing the sealing film of the color oil flow oil beaker, stirring for about 3 minutes by using a glass rod, brushing the surface of the color oil flow test area of the test model along the airflow direction by using a soft goat hair brush to form a uniform oil material layer, and then performing the color oil flow test according to the test flow.
Finally, after the test is completed, the oil on the surface of the model is removed by using analytically pure alcohol and dust-free paper and the like.
Preferably, the sealing film is used for sealing the opening of the beaker when the prepared color oil flow is stored.
Preferably, the colorful oil flow is suitable for a temporary impulse type wind tunnel, and the incoming flow Mach number is 0.6-0.8.
Preferably, the time of 5-8 min is required until the oil spectrum solidification is finished after the oil is coated on the flow field, wherein the time of 3-7 min is required for the oil flow to be coated on the flow field, the air blowing process lasts for 1-2 min, and the volatilization speeds of the solvents are different in two periods; the temperature of the oil film is reduced by about 15-20 ℃ in the blowing process of the flow field, and the viscosity of the carrier is gradually increased. Aviation kerosene volatilizes in the above-described process, and since the viscosity of silicone oil having a viscosity of 2000CS is relatively high, the mixture consisting mainly of silicone oil and filler forms a relatively fixed raised oil flow trace, which is not easily broken.
Drawings
Fig. 1 is a graph of the effect of a color oil flow test using the oil flow oil of example 3.
THE ADVANTAGES OF THE PRESENT INVENTION
The invention has the advantages that:
(1) clear oil flow lines can be formed under the condition of the temporary impulse type wind tunnel.
(2) After fine proportioning, the obtained oil spectrum has better curing degree and is not easy to be blown by the recoil airflow stopped by the wind tunnel to disturb the oil spectrum.
(3) The proportioning is simple, convenient and quick, and the cost is low.
Detailed Description
Color oil flow formulas of embodiments 1-4 of the present invention
TABLE 1 examples 1-4 color oil flow formulations
The colored oil flow formulations of examples 1-4 were prepared and tested as follows, with test conditions: the temporary impulse wind tunnel has an incoming flow Mach number of 0.6-0.8.
The method comprises the following steps: estimating the consumption of the raw materials according to the area of a region to be measured of the test model and the coating formula;
step two: an electronic balance with the mass weighing precision higher than 1% is applied, and the weight ratio is 5: 2: 3, weighing the carrier, the diluent and the filler according to the proportion, and placing the mixture in a beaker;
step three: stirring the mixture in the beaker by using a glass rod, standing for 5 minutes after stirring until no obvious agglomeration phenomenon exists, and simultaneously sealing the opening of the beaker by using a sealing film;
step four: standing and then continuously stirring for about 3 minutes for use;
step five: when in brushing, a soft wool brush is used for brushing along the airflow direction;
step six: when the oil spectrum was cleared after the test was completed, the wipe was performed using analytically pure alcohol.
Example 3 the effect of the oil flow test is shown in figure 1.
Claims (8)
1. A color oil flow formula suitable for subsonic velocity temporary wind tunnel is characterized in that: the formula consists of a carrier, a diluent and a filler, wherein the carrier comprises the following components in percentage by mass: diluent agent: filler 5: 2: 3.
2. the color oil flow formula suitable for subsonic temporary impulse wind tunnels according to claim 1, wherein: the carrier is methyl silicone oil with 2000cs viscosity.
3. The color oil flow formula suitable for subsonic temporary impulse wind tunnels according to claim 1, wherein: the diluent adopts aviation kerosene.
4. The color oil flow formula suitable for subsonic temporary impulse wind tunnels according to claim 1, wherein: the filler is mineral powder with the grain diameter of 100 nm-5 um.
5. The method of using the colored oil stream formulation of any one of claims 1 to 4, comprising the steps of:
the method comprises the following steps: estimating the consumption of the raw materials according to the area of a region to be measured of the test model and the coating formula;
step two: an electronic balance with the mass weighing precision higher than 1% is applied, and the weight ratio is 5: 2: 3, weighing the carrier, the diluent and the filler according to the proportion, and placing the mixture in a beaker;
step three: stirring the mixture in the beaker by using a glass rod, standing for 5 minutes after stirring until no obvious agglomeration phenomenon exists, and simultaneously sealing the opening of the beaker by using a sealing film;
step four: standing and then continuously stirring for about 3 minutes for use;
step five: when in brushing, a soft wool brush is used for brushing along the airflow direction;
step six: when the oil spectrum was cleared after the test was completed, the wipe was performed using analytically pure alcohol.
6. The method of using a color oil stream formulation according to claim 5, wherein the formulated color oil stream is stored with a sealing film closing the beaker mouth.
7. The method of claim 5, wherein the color oil flow is suitable for temporary impulse wind tunnel with an incoming flow Mach number of 0.6-0.8.
8. The method of using the colored oil flow formulation of claim 7, wherein: the time of 5-8 min is required until the oil spectrum solidification is finished after the oil is coated on the flow field, wherein the time of 3-7 min is required for the oil flow to be coated on the flow field, the air blowing process lasts for 1-2 min, and the volatilization speeds of the solvent in two time periods are different; the temperature of the oil film is reduced by about 15-20 ℃ in the blowing process of the flow field, and the viscosity of the carrier is gradually increased.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067244A (en) * | 2020-09-07 | 2020-12-11 | 中国航空工业集团公司沈阳空气动力研究所 | Formula and use method of dual-component fluorescent oil film suitable for subsonic velocity temporary wind tunnel |
| CN115371950A (en) * | 2022-10-21 | 2022-11-22 | 中国航空工业集团公司沈阳空气动力研究所 | Fluorescent color oil flow spectrum three-dimensional reconstruction formula and method suitable for inner pipeline |
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| CN108760225A (en) * | 2018-04-03 | 2018-11-06 | 西北工业大学 | A kind of oil stream formula of the high-speed wind tunnel oil stream experiment of clearly calibration range of Mach numbers |
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2019
- 2019-12-06 CN CN201911241578.5A patent/CN110987356A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067244A (en) * | 2020-09-07 | 2020-12-11 | 中国航空工业集团公司沈阳空气动力研究所 | Formula and use method of dual-component fluorescent oil film suitable for subsonic velocity temporary wind tunnel |
| CN112067244B (en) * | 2020-09-07 | 2023-09-05 | 中国航空工业集团公司沈阳空气动力研究所 | Bi-component fluorescent oil film formula suitable for subsonic temporary flushing wind tunnel and using method |
| CN115371950A (en) * | 2022-10-21 | 2022-11-22 | 中国航空工业集团公司沈阳空气动力研究所 | Fluorescent color oil flow spectrum three-dimensional reconstruction formula and method suitable for inner pipeline |
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Application publication date: 20200410 |