CN108760225A - A kind of oil stream formula of the high-speed wind tunnel oil stream experiment of clearly calibration range of Mach numbers - Google Patents
A kind of oil stream formula of the high-speed wind tunnel oil stream experiment of clearly calibration range of Mach numbers Download PDFInfo
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- CN108760225A CN108760225A CN201810285276.7A CN201810285276A CN108760225A CN 108760225 A CN108760225 A CN 108760225A CN 201810285276 A CN201810285276 A CN 201810285276A CN 108760225 A CN108760225 A CN 108760225A
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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 present invention relates to a kind of oil stream formulas of the high-speed wind tunnel oil stream experiment of clearly calibration range of Mach numbers, specifically it is suitable for the oil stream formula that the oil stream that range of Mach numbers is 0.5-0.9 is tested, pass through a series of experiments, it determines and uses trace particle --- titania powder, carrier oil plant --- silicone oil and diluent --- oleic acid, and determine the mass percent relationship of three, it completes a large amount of oil-flow visualization experiment and shows that the oil stream matches the oil stream trial image that can obtain high quality, for analysis model airflow on surface fluidised form, to achieve the effect that flow visual.
Description
Technical field
The present invention relates to a kind of oil stream formula of the high-speed wind tunnel oil stream experiment of clearly calibration range of Mach numbers, it is specific and
Speech is the oil stream formula for being related to the oil stream that range of Mach numbers is 0.5-0.9 and testing.
Background technology
Oil stream experiment shoots obtained oil stream collection of illustrative plates and mainly reflects the flowing picture near object plane so that flow field is " visual
Change ", the Complex Phenomena in Vertical Bell Jar such as Secondary Flow, separation flowing and vortex motion can be analyzed according to obtained oil stream path line.
Therefore, oil stream experiment is to understand boundary layer separation and one of the important laboratory facilities of eddy structure, is widely used in pneumatic department
The Flow visualisation in part flow field and measurement, such as：The fuselage and wing of aircraft, the rotary blades machinery such as aero-engine, gas turbine
Blade, end wall etc..
Oil stream experiment principle approximately as：Since oil film thickness is very thin, oily viscosity is far longer than air
Viscosity, while pressure term is a small amount of compared with frictional force item in addition to singular point so that influence of the oil film to true flow field is non-
It is often small, it can be ignored.When oil film thickness is less than boundary layer thickness, oil film is object plane on boundary, meets non-slip condition,
On its coboundary/interface of oil and gas, the speed and their shear stress, viscous stress of oil stream and air-flow are equal.By related public
Formula derives it is found that oil stream path line equation approximatively shows that air-flow streams middle object plane friction line.Thus, oil stream is composed actually
Frictional force line spectrum on object plane is shown.
In conclusion oil stream coating be determine oil stream experiment whether key factor that can be successful, can only obtain
The mobility status in flow field could be truly reflected to high-visible display result.However, being flowed through under different Mach number operating mode
The fluid velocity of oil stream coating is different, and frictional force size also has very big difference；When dope viscosity is more than frictional force, motion pattern
Spectrum is relatively fuzzyyer；And when dope viscosity is more than frictional force, the oil stream coating for being coated on tested model surface may be by air band
It walks, streamline collection of illustrative plates is imperfect.Therefore, the key of oil stream Success in Experiment is the oil stream coating for selecting to adapt to pneumatic blowing wind facies,
Proportioning of the i.e. different blowing conditions between the finish, trace particle and finish of coating has different requirements, i.e., oil stream used
The properties such as viscosity, the consistency of coating all should be so as to obtain that trace is clear, preserves good stream under the operating mode of mark
Line.
Therefore, the oil stream coating of selection different formulations is needed for the experiment condition of different Mach number, and should be shifted to an earlier date
Calibrate be applicable in specific range of Mach numbers.However, existing oil stream coating tend not to calibrate its be applicable in it is specific
Operating mode brings very big puzzlement when choosing formulation for coating material to researcher, needs constantly to choose formulation for coating material and carry out
Can preliminary experiment examine it be applicable in, and increases experimental cost, also affects the progress of experiment.Therefore, it is highly desirable to make up this
The deficiency of aspect proposes the oil stream formulation for coating material for clearly demarcating its applicable working condition.
For the above situation, the present invention is to propose a kind of oil stream formula for clearly demarcating applicable working condition range：The coating
It is tested suitable for the oil stream that range of Mach numbers is 0.5-0.9.The oil stream coating energy configured by lot of experiment validation, the present invention
It is enough that satisfactory oil stream experimental result is obtained under the operating mode：Oil stream path line is clear apparent under experiment condition, collection of illustrative plates not
Be vulnerable to non-experiment condition factor and influence, can the significant advantages such as long-term preservation, carry out 0.5-0.9 Mach numbers for researcher
Under oil stream experiment provide selection.
Invention content
The technical problem to be solved in the present invention is to provide it is a kind of can range of Mach numbers be 0.5-0.9 high-speed wind tunnel under
The oil stream formula of high-visible oil stream experimental result is obtained, certain is analyzed by testing obtained body surface oil stream path line
A little special flow phenomenons, deepen the understanding of stream field flowing information.
The oil stream coating that the present invention is configured has following remarkable advantage：
(1) after wind-tunnel starts but before predetermined flow rate has not yet been reached, i.e. when Mach 2 ship 0.5-0.9, will not be flowed, just
It can ensure to be interfered by other factors before reaching experiment condition while coating is brushed.
(2) after wind-tunnel parking, oil stream spectrum is not influenced by Returning flow and gravity etc., can very well be protected
The result for staying oil stream to test.
(3) do not have other coating all toxicity and corrosiveness, and raw material is easy to purchase on the market, because former
Material does not have combustibility, can be applied in the oil stream experiment of aero-engine.
(4) coating is being protected from light, can preserved for a long time at shady and cool, drying, and Reusability, performance can be guaranteed.
By a large amount of blasting experimental verifications, the present invention can be in the oil stream experiment that range of Mach numbers is 0.5-0.9
High-visible experimental result is obtained, the understanding of stream field can be deepened according to these results, is had to the performance of experimental piece more straight
The understanding of sight.
Specific technical solution of the present invention is：
It is a kind of suitable for low-speed wind tunnel range of Mach numbers be 0.5-0.9 oil stream test oil stream formula, by trace particle,
Carrier oil plant and diluent are formulated by mass percentage, and mass percent is：Carrier oil plant 30%, trace particle
65%, diluent 5%.
Above-mentioned carrier oil plant is silicone oil.
Above-mentioned trace particle is titania powder.
Above-mentioned diluent is oleic acid.
Specific implementation mode
A kind of oil stream formula tested suitable for the oil stream that wind-tunnel range of Mach numbers is 0.5-0.9, by indicator, that is, dioxy
Change titanium powder, carrier oil plant, that is, silicone oil and diluent, that is, oleic acid to be formulated by mass percentage, mass percent：
Silicone oil：30%
Trace particle：65%
Oleic acid：5%
1. recipe configuration：It is according to mass percent：Carrier oil plant 30%, trace particle 65%, diluent 5% are matched
Than it is noted that trace particle powder is sufficiently stirred with finish in coating configuration process, coating bottle is packed into after the completion of proportioning.
2. opening coating bottle, it is set to be uniformly mixed with glass bar stirring.
3. appropriate oil stream coating is poured into beaker.
4. testpieces waits for that brushing surface is horizontal positioned, brush direction will perpendicular to direction of flow,
5. coating only needs to brush one layer, coating layer thickness will keep uniform.
6. installing testpieces as early as possible after brushing.
7. off-test should take out rapidly the testpieces for remaining with blowing result.
8. if condition is permitted, coating variation can be observed in real time using video camera；If condition limits, can be after experiment
It is rapid to take out testing machine, shoot oil stream collection of illustrative plates using high-definition digital camera.
Claims (4)
1. a kind of oil stream formula of the high-speed wind tunnel oil stream experiment of clearly calibration range of Mach numbers, is specifically suitable for Mach
The oil stream formula of the oil stream experiment of number ranging from 0.5-0.9, it is characterised in that matter is pressed by trace particle, carrier oil plant and diluent
Amount percentage is formulated, and mass percent is：Carrier oil plant 30%, trace particle 65%, diluent 5%.
2. a kind of oil stream formula suitable for oil-flow visualization experiment according to claim 1, it is characterised in that the load
Body oil plant is silicone oil.
3. a kind of oil stream formula suitable for oil-flow visualization experiment according to claim 1, it is characterised in that described shows
Track particle is titania powder.
4. a kind of oil stream formula suitable for oil-flow visualization experiment according to claim 1, it is characterised in that described is dilute
It is oleic acid to release agent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285276.7A CN108760225A (en) | 2018-04-03 | 2018-04-03 | 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201810285276.7A CN108760225A (en) | 2018-04-03 | 2018-04-03 | 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987356A (en) * | 2019-12-06 | 2020-04-10 | 中国航空工业集团公司沈阳空气动力研究所 | Formula and using method of colored oil flow suitable for subsonic velocity temporary flushing wind tunnel |
| CN111811769A (en) * | 2020-06-16 | 2020-10-23 | 南京航空航天大学 | Three-dimensional internal rotation type air inlet channel real-time oil flow display method with waverider precursor and adopted oil agent |
| 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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| CN102533109A (en) * | 2011-12-14 | 2012-07-04 | 中国航空工业集团公司沈阳空气动力研究所 | Oil formula of high speed wind tunnel colorful oil flow experiment |
| CN104849017A (en) * | 2015-04-29 | 2015-08-19 | 中国航空工业集团公司哈尔滨空气动力研究所 | Two-component oil for colorful oil flow test of low-speed wind tunnel |
| CN106908214A (en) * | 2017-03-10 | 2017-06-30 | 中国空气动力研究与发展中心高速空气动力研究所 | The collocation method and experiment finish of high-speed wind tunnel oil stream experiment finish |
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2018
- 2018-04-03 CN CN201810285276.7A patent/CN108760225A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102533109A (en) * | 2011-12-14 | 2012-07-04 | 中国航空工业集团公司沈阳空气动力研究所 | Oil formula of high speed wind tunnel colorful oil flow experiment |
| CN104849017A (en) * | 2015-04-29 | 2015-08-19 | 中国航空工业集团公司哈尔滨空气动力研究所 | Two-component oil for colorful oil flow test of low-speed wind tunnel |
| CN106908214A (en) * | 2017-03-10 | 2017-06-30 | 中国空气动力研究与发展中心高速空气动力研究所 | The collocation method and experiment finish of high-speed wind tunnel oil stream experiment finish |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987356A (en) * | 2019-12-06 | 2020-04-10 | 中国航空工业集团公司沈阳空气动力研究所 | Formula and using method of colored oil flow suitable for subsonic velocity temporary flushing wind tunnel |
| CN111811769A (en) * | 2020-06-16 | 2020-10-23 | 南京航空航天大学 | Three-dimensional internal rotation type air inlet channel real-time oil flow display method with waverider precursor and adopted oil agent |
| CN111811769B (en) * | 2020-06-16 | 2021-08-06 | 南京航空航天大学 | Three-dimensional internal rotation type air inlet channel real-time oil flow display method with wave-rider precursor |
| 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: 20181106 |