CN107677444A - A kind of method for measuring icing tunnel cloud and mist uniformity - Google Patents
A kind of method for measuring icing tunnel cloud and mist uniformity Download PDFInfo
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- CN107677444A CN107677444A CN201710830886.6A CN201710830886A CN107677444A CN 107677444 A CN107677444 A CN 107677444A CN 201710830886 A CN201710830886 A CN 201710830886A CN 107677444 A CN107677444 A CN 107677444A
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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
Abstract
A kind of method of measurement icing tunnel cloud and mist uniformity of the present invention, including installation grid equipment；Rime ice icing simulation；Measure icing thickness；Measurement result is converted into relative icing thickness；Cloud and mist uniform distribution figure is drawn, carries out the step of cloud and mist uniformity judges.The method of the present invention, can accurate measurement icing wind tunnel test section cloud and mist uniformity, so as to conveniently determine whether to meet index request, measurement result data processing simple and fast, obtained cloud and mist uniform distribution cloud atlas is directly perceived, image.
Description
Technical field
The invention belongs to aviation aerodynamic force wind-tunnel technique field, is related to a kind of measurement icing tunnel cloud and mist uniformity
Method, test section cloud and mist uniformity and cloud and mist coverage are measured during for icing tests.
Background technology
Under specific meteorological condition, substantial amounts of super-cooling waterdrop is contained in cloud layer, when aircraft is passed through containing super-cooling waterdrop
During cloud layer, water droplet can strike the surface of aircraft, and icing phenomenon occurs.It is a weight for influenceing aircraft safety that aircraft, which freezes,
Factor is wanted, airframe icing changes the profile of aircraft, adds the roughness on surface, so as to change the pneumatic of aircraft
Characteristic and performance, make the hydraulic performance decline of aircraft or make power failure, and the longitudinal stability of aircraft can be made to deteriorate suddenly,
Anti- manipulation phenomenon even occurs, therefore easily causes aviation accident, seriously threatens flight safety.Wind tunnel test, numerical value
Simulation and flight test are to carry out three big important means of aircraft icing research, and wherein icing wind tunnel experiment is most basic hand
Section.Icing wind tunnel establishes super-cooling waterdrop cloud and mist flow field by spraying system, refrigeration system etc. in test section, aerial to simulate
Icing meteorology condition, therefore need that the cloud parameter in test section flow field is calibrated and measured before icing tests.I
The large and medium-sized icing wind tunnel construction of state just starts to walk, and not yet establishes cloud and mist parameter measurement side in a kind of relatively good wind-tunnel
Method.
The content of the invention
The purpose of the present invention is：For the calibration and measurement of icing wind tunnel cloud parameter, propose that one kind can measure cloud and mist
The method of uniformity.The present invention solves the problems, such as it is that the cloud and mist uniformity of icing wind tunnel test section is calibrated and measured.
In view of the above mentioned problem of prior art, according to one side disclosed by the invention, the present invention uses following technology
Scheme：
A kind of method for measuring icing tunnel cloud and mist uniformity, comprises the following steps；
1) grid equipment is installed
Using the uniformity of grid device measuring cloud and mist, grid is arranged on model pivot in icing wind tunnel test section
Position, its cross section and test section central axis upright；
2) rime ice icing simulation
Under certain simulation wind speed, and in environment below -20 DEG C of static temperature, icing tunnel spraying system is set continuously to spray
100 seconds, water droplet froze on the floor of grid windward side；
3) icing thickness is measured
After rime ice icing simulation off-test, testing crew, with the kind of calliper icing thickness of cooling, is chosen into wind-tunnel
Two grid midpoints H1, H2 on grid floor in the horizontal direction, two grid midpoint V1 with vertical direction, V2 are carried out
Thickness measure；
4) relative icing thickness conversion
Measurement result is converted into relative icing thicl ness TiceR, normalized with the icing thickness in wind-tunnel axle center：
Wherein：τ(x,y)：The ice layer thickness of each (x, y) position；
τgrid：Non- icing condition Under The Grille thickness；
τC：Wind-tunnel center line icing thickness under ice-formation condition；
OrOr
LWC(x,y)：The local Liquid water content of each measurement point；
LWCC：The local Liquid water content of wind-tunnel center line；
∝ is proportional symbol；
5) cloud and mist uniform distribution figure is drawn
Obtained icing thickness will be measured above by calculating processing and change into corresponding LWC values, draw cloud and mist uniformity
Distribution map, carry out cloud and mist uniformity judgement.
Characterized in that, in step 2) during rime ice icing simulation, spraying system is continuously sprayed 100 seconds, and control water droplet is in lattice
Icing thickness avoids collection coefficient from changing in 3~5mm or so on the floor of grid windward side.
Beneficial effect：
(1) using the method for the present invention, can accurate measurement icing wind tunnel test section cloud and mist uniformity, so as to convenient true
It is fixed whether to meet index request.
(2) method of the invention, measurement result data processing simple and fast, obtained cloud and mist uniform distribution cloud atlas are straight
See, image.
Brief description of the drawings
Fig. 1 is grid equipment schematic diagram；
Fig. 2 is cloud and mist uniform distribution figure.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
A kind of method of measurement icing tunnel cloud and mist uniformity of the present invention, comprises the following steps；
(1) uniformity of grid device measuring cloud and mist is used, grid is arranged in icing wind tunnel test section in model rotation
Heart position, its cross section and test section central axis upright.
(2) experiment is under certain wind speed, the rime ice ice-formation condition below -20 DEG C of static temperature, and spraying system continuously sprays one
Fix time, control water droplet icing thickness on the floor of grid windward side in 3~5mm or so, avoids collection coefficient from changing.
(3) after off-test, testing crew into wind-tunnel with the kind of calliper measuring point ice thickness of cooling, during thickness measure
Take and (mark V in such as Fig. 1 at the horizontal midpoint with vertical direction on grid floor1, V2, H1, H2Point).
(4) measurement result is converted into relative icing thicl ness TiceR, normalized with the icing thickness in wind-tunnel axle center：
The measurement of wind-tunnel center line icing thickness is determined by below equation under ice-formation condition：
Wherein：
τc：The icing thickness of center grates
τ(x,y)：The ice layer thickness of each (x, y) position
τgrid：Non- icing condition Under The Grille thickness
LWC(x,y)：The Liquid water content of each (x, y) position
LWCc：The Liquid water content at wind-tunnel center
∝：It is proportional
V1, V2：Center grates vertical midpoint position
H1, H2：Center grates horizontal mid-point position
(5) obtained icing thickness will be measured above by calculating processing and changes into corresponding LWC values, it is equal to draw cloud and mist
Even property distribution map, cloud and mist uniformity judgement is carried out, as shown in Figure 2.
Claims (7)
1. a kind of method for measuring icing tunnel cloud and mist uniformity, comprises the following steps；
1) grid equipment is installed, using the uniformity of grid device measuring cloud and mist；
2) rime ice icing simulation, water droplet is made to be frozen on the floor of grid windward side；
3) testing crew measurement icing thickness；
4) measurement result is converted into relative icing thickness；
5) cloud and mist uniform distribution figure is drawn, carries out cloud and mist uniformity judgement.
A kind of 2. method for measuring icing tunnel cloud and mist uniformity as claimed in claim 1, it is characterised in that the step 1) tool
Body is：Using the uniformity of grid device measuring cloud and mist, grid is arranged on model pivot position in icing wind tunnel test section,
Its cross section and test section central axis upright.
A kind of 3. method for measuring icing tunnel cloud and mist uniformity as claimed in claim 1, it is characterised in that the step 2) tool
Body is：Under certain simulation wind speed, and in environment below -20 DEG C of static temperature, making icing tunnel spraying system, continuously spraying is certain
Time, water droplet is set to be frozen on the floor of grid windward side.
A kind of 4. method for measuring icing tunnel cloud and mist uniformity as claimed in claim 1, it is characterised in that the step 3) tool
Body is：After rime ice icing simulation off-test, testing crew, with the kind of calliper icing thickness of cooling, chooses grid into wind-tunnel
Two grid midpoints H1, H2 on floor in the horizontal direction, two grid midpoint V1 with vertical direction, V2 carry out thickness survey
Amount.
A kind of 5. method for measuring icing tunnel cloud and mist uniformity as claimed in claim 1, it is characterised in that the step 4) tool
Body is：Measurement result is converted into relative icing thicl ness TiceR, normalized with the icing thickness in wind-tunnel axle center：
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Wherein：τ(x,y)：The ice layer thickness of each (x, y) position；
τgrid：Non- icing condition Under The Grille thickness；
τC：Wind-tunnel center line icing thickness under ice-formation condition；
OrOr
LWC(x,y)：The local Liquid water content of each measurement point；
LWCC：The local Liquid water content of wind-tunnel center line；
∝ is proportional symbol.
A kind of 6. method for measuring icing tunnel cloud and mist uniformity as claimed in claim 1, it is characterised in that the step 5) tool
Body is：Obtained icing thickness will be measured above by calculating processing and change into corresponding LWC values, draw cloud and mist uniform distribution
Figure, carry out cloud and mist uniformity judgement.
A kind of 7. method for measuring icing tunnel cloud and mist uniformity as claimed in claim 3, it is characterised in that rime ice in step 2)
During icing simulation, spraying system is continuously sprayed 100 seconds, and it is 3~5mm to control water droplet icing thickness on the floor of grid windward side,
Collection coefficient is avoided to change.
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| CN201710830886.6A CN107677444A (en) | 2017-09-15 | 2017-09-15 | A kind of method for measuring icing tunnel cloud and mist uniformity |
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| CN201710830886.6A CN107677444A (en) | 2017-09-15 | 2017-09-15 | A kind of method for measuring icing tunnel cloud and mist uniformity |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006620A (en) * | 2019-02-18 | 2019-07-12 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of moisture film measuring system |
| CN112729762A (en) * | 2021-03-29 | 2021-04-30 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for measuring uniformity of icing grid and cloud and mist field |
| CN113899663A (en) * | 2021-12-08 | 2022-01-07 | 中国空气动力研究与发展中心低速空气动力研究所 | MVD (mechanical vapor recompression) measuring method for complex icing cloud mist in large icing wind tunnel |
| CN113899784A (en) * | 2021-12-08 | 2022-01-07 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for measuring content of complex icing cloud mist water in large icing wind tunnel |
| CN114720082A (en) * | 2022-06-10 | 2022-07-08 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for optimizing icing cloud and mist uniformity of large icing wind tunnel |
| CN115180174A (en) * | 2022-09-14 | 2022-10-14 | 中国飞机强度研究所 | Icing test method for airplane test |
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| CN103471804A (en) * | 2013-07-15 | 2013-12-25 | 中国商用飞机有限责任公司 | Method and device for water-mist uniformity control |
| KR20140115835A (en) * | 2013-03-22 | 2014-10-01 | 한국항공우주산업 주식회사 | Method for simulating ice accretion around an air intake |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006620A (en) * | 2019-02-18 | 2019-07-12 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of moisture film measuring system |
| CN112729762A (en) * | 2021-03-29 | 2021-04-30 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for measuring uniformity of icing grid and cloud and mist field |
| CN112729762B (en) * | 2021-03-29 | 2021-07-02 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for measuring uniformity of icing grid and cloud and mist field |
| CN113899663A (en) * | 2021-12-08 | 2022-01-07 | 中国空气动力研究与发展中心低速空气动力研究所 | MVD (mechanical vapor recompression) measuring method for complex icing cloud mist in large icing wind tunnel |
| CN113899784A (en) * | 2021-12-08 | 2022-01-07 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for measuring content of complex icing cloud mist water in large icing wind tunnel |
| CN114720082A (en) * | 2022-06-10 | 2022-07-08 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for optimizing icing cloud and mist uniformity of large icing wind tunnel |
| CN115180174A (en) * | 2022-09-14 | 2022-10-14 | 中国飞机强度研究所 | Icing test method for airplane test |
| CN115180174B (en) * | 2022-09-14 | 2022-11-22 | 中国飞机强度研究所 | Icing test method for airplane test |
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Application publication date: 20180209 |
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