CN104354867B - A kind of method for designing of supercool big water droplet icing detector - Google Patents
A kind of method for designing of supercool big water droplet icing detector Download PDFInfo
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Abstract
The invention discloses a kind of method designing supercool big water droplet (SLD) icing detector profile with the numerical computation method clashed into based on super-cooling waterdrop motion.Existing icing detector, by information such as the Liquid water content in atmospheric sounding, temperature, analyses whether there is ice-formation condition further.It is an object of the invention to solve existing detection mode only that Liquid water content is sensitive, and cannot distinguish between drop particle diameter, it is impossible to for the problem of SLD icing detection.It includes the first protruding and rear portion, is connected by groove between the first projection and rear portion.The present invention designs the detector configuration of Curvature varying so that when conventional water droplet, water droplet will all strike the front portion of configuration, only one of which continuous print impingement region on whole detector；When SLD, except previous section has super-cooling waterdrop to knock, after also will run into the shock of super-cooling waterdrop, this will appear as detector occur multiple discontinuous ice field.
Description
Technical field
The present invention relates to aerospace detection field, the method for designing of especially a kind of supercool big water droplet icing detector and detector.The present invention can effectively determine in flight environment of vehicle whether there is supercool big water droplet, thus providing safeguard for aircraft icing security protection.
Background technology
Air is high aerial to be existed lower than zero degree, but still belongs to the super-cooling waterdrop of liquid, and this water droplet is somewhat interfered it is possible to freeze rapidly.When aircraft is through the cloud layer containing super-cooling waterdrop, super-cooling waterdrop strikes aircraft surfaces, it will icing phenomenon occurs, and icing is one of important hidden danger of flight safety.Since a very long time in past, researcher is thought that aircraft freezes mainly to be caused by the diameter supercool little water droplet less than 50 μm, research work also carries out mainly for supercool little water droplet, American Eagles aviation in 1994 is difficult and a series of due to SLD (SupercooledLargeDroplet afterwards, referring to the diameter super-cooling waterdrop more than 50 μm) airplane crash that causes of freezing makes people recognize, SLD freezes and is widely present in flight practice, and the harm that flight safety is caused often freezes bigger than little water droplet.
Whether present icing detector can only exist ice-formation condition in atmospheric sounding, and whether atmospheric sounding can not exist SLD, the method of domestic and international existing detector is: the information such as Liquid water content in atmospheric sounding, temperature, analyse whether there is ice-formation condition, before airframe occurring freeze, send warning signal.Existing method is only sensitive to Liquid water content, it is impossible to distinguishing drop particle diameter, this allows for these detectors existing and all cannot be used for SLD freezing environment identification.
The design of SLD icing detector has been explored by Ge Junfeng, Xu Yifei, Zhou Can of the Central China University of Science and Technology et al., their method for designing proposing two kinds of SLD icing detector profiles, a kind of is some the guess design various shapes utilizing and SLD dividing performance, experimental technique is relied on to determine profile, this method lacks the foundation of profile curvature design, selecting the qualified Exterior Surface Design cycle by substantial amounts of experiment long, cost is high；Second method is to utilize SLD to strike the guess design outline curve that after leading edge flows slowly into groove, the again flow direction, shuttle sidewall freezes, this method is the same with former approach, lack the foundation of profile curvature design, there is design, proving period equally long, the shortcoming that cost is high, and this method is strong to super-cooling waterdrop temperature-independent, if temperature is very low, even if having SLD to strike leading edge also can freeze at once, will not flowing groove and rear shuttle, this method is actually infeasible.Additionally, both approaches is based on some guesses SLD frozen with the conventional charging properties frozen and carries out configuration design, but charging properties except with drop particle diameter size mutually outside the Pass, also relevant to other conditions such as temperature, Liquid water content, the method for designing relying on charging properties can not distinguish SLD and conventional water droplet icing completely.
In sum, whether existing ripe icing detector can only exist ice-formation condition in atmospheric sounding, and whether can not there is SLD in atmospheric sounding；The Exterior Surface Design of existing SLD icing detector all relies on some guesses of designer, lacks design considerations, and design, proving period are long, and cost is high, and there are the defects in some designs.
Summary of the invention
Existing icing detector, by information such as the Liquid water content in atmospheric sounding, temperature, analyses whether there is ice-formation condition further.It is an object of the invention to solve existing detection mode only that Liquid water content is sensitive, and cannot distinguish between drop particle diameter, it is impossible to for the problem of SLD icing detection.The present invention provides a kind of method designing supercool big water droplet (SLD) icing detector profile with the numerical computation method clashed into based on super-cooling waterdrop motion, the i.e. method for designing of a kind of supercool big water droplet icing detector and detector.It is only that Liquid water content is sensitive that the goal of the invention of the present invention is in that to solve existing detection mode, and cannot distinguish between drop particle diameter, it is impossible to for the problem of SLD icing detection.Compared with freezing with conventional water droplet, SLD freezes the harm to Flight Safety more seriously, therefore, adopts suitable method detects in flight environment of vehicle whether there is SLD, the flight safety under ice-formation condition is had very useful engineering significance.The invention discloses the method for designing of a kind of supercool big water droplet icing detector and detector, the method for designing of the present invention utilizes SLD bigger than conventional water droplet inertia, the feature that water droplet trajectory deviation running orbit is slow, design the detector configuration of Curvature varying, when making conventional water droplet, water droplet will all strike the front portion of configuration, only one of which continuous print impingement region on whole detector；When SLD, except previous section has super-cooling waterdrop to knock, after also will run into the shock of super-cooling waterdrop, this will appear as detector occur multiple discontinuous ice field.Determine in flight environment of vehicle whether there is SLD by ice field number, thus providing initial conditions for aircraft icing security protection.
To achieve these goals, the present invention adopts the following technical scheme that
The method for designing of a kind of supercool big water droplet icing detector, comprises the steps:
(1) one detector configuration of design, this detector configuration includes the first protruding and rear portion, being connected by groove between described first projection and rear portion, and wherein, described rear portion is made up of several second projections, is connected by groove between described second projection；
(2) For Determining The Droplet Trajectories that the detector configuration of step 1 design is carried out under conventional water droplet calculates, and For Determining The Droplet Trajectories when supercool big water droplet calculates；
(3) if the result of step 2 shows, when conventional water droplet and supercool big water droplet, first projection and rear portion all have the words that droplets impact arrives, illustrate when conventional water droplet and SLD, first projection and rear portion can freeze, with regard to the supercool big water droplet condition of None-identified, raise the height of the first projection or reduce the height of the second projection in rear portion, obtain new detector configuration, the new detector configuration obtained is returned step 2 and carries out under conventional water droplet respectively and For Determining The Droplet Trajectories when supercool big water droplet calculates；
If when conventional water droplet and supercool big water droplet, rear portion does not all have the words that droplets impact arrives, illustrate when conventional water droplet and SLD, second projection at rear portion is all without freezing, also the supercool big water droplet condition of None-identified, reduce the height of the first projection or raise the height of the second projection in rear portion, obtaining new detector configuration, the new detector configuration obtained being returned step 2 and carries out under conventional water droplet respectively and For Determining The Droplet Trajectories when supercool big water droplet calculates；
If when conventional water droplet, water droplet only impinges upon in the first projection of detector configuration, and when SLD, the first projection and rear portion all has droplets impact to arrive, it was shown that this detector configuration meets the requirements, and terminates design,.
In described step 3, whether there is multiple discontinuous ice field by detector configuration and judge whether supercool big water droplet, distinguished supercool big water droplet and conventional water droplet by the ice condition at detector configuration rear portion.
In described step 1, described rear portion is made up of second projection, is connected by groove between described first projection and the second projection.
In described step 3, the described height of the first projection and the height at rear portion are based on For Determining The Droplet Trajectories result of calculation when under conventional water droplet with supercool big water droplet.
A kind of supercool big water droplet icing detector, including the first protruding and rear portion, is connected by groove between described first projection and rear portion, and described rear portion is made up of several second projections, is connected by groove between described second projection.
Described rear portion is made up of second projection, is connected by groove between described first projection and the second projection.This structure formed front projection, in the configuration of projection recessed, rear.
Described first projection can freeze when conventional water droplet and SLD；Second projection at described rear portion does not freeze in conventional water droplet condition bottom, can freeze when supercool big water droplet.
Described rear portion is made up of second projection, is connected by groove between described first projection and the second projection.
For foregoing problems, the present invention provides method for designing and the detector of a kind of supercool big water droplet icing detector.In the method for the present invention, the detector configuration of one Curvature varying of design so that when conventional water droplet, water droplet will all strike the front portion (namely in the first projection) of configuration, only one of which continuous print impingement region on whole detector；And when supercool big water droplet, except anterior (namely in the first projection) has super-cooling waterdrop to knock, rear portion also will run into the shock of super-cooling waterdrop, on the detector thus showing multiple discontinuous ice field.
For simplest three impingement regions, this detector includes first protruding and the second projection, and the first projection projects through groove with second and is connected, and namely this detector is made up of two bossings, using the first projection as front bossing, using the second projection as rear bossing.The front bossing of detector there will be icing under conventional super-cooling waterdrop, and then bossing does not have icing phenomenon；And when SLD, front bossing and the rear bossing of detector all there will be ice condition.Detect whether there is ice-formation condition by the ice condition of detector diverse location, distinguish the icing of SLD icing and conventional super-cooling waterdrop simultaneously.Adopt the detector of the present invention, conventional water droplet can only impinge upon bossing (i.e. the first projection) before detector, then namely can strike on the rear portion of detector in SLD situation, identify that SLD freezes by the difference of ice forming locations.
In the present invention, the configuration protruding before the first projection, groove, rear portion formation, middle concave is entered, rear portion is protruding again, thus forming the change of concavo-convex slope of a curve, and concavo-convex slope of a curve changes the key factor of present invention design just.By the design to panel detector structure so that when SLD, a water droplet energy part strikes in the first projection, and a part strikes on rear portion.
In the present invention, first design a detector configuration, and calculate its For Determining The Droplet Trajectories under conventional water droplet and when supercool big water droplet respectively and calculate.
According to the result calculated, if when conventional water droplet and supercool big water droplet, the first projection and rear portion all have the words that droplets impact arrives, it was shown that when conventional water droplet and SLD, front and back bossing all can freeze, with regard to the supercool big water droplet condition of None-identified.In that case, need configuration is improved, after the explanation of this situation, bossing slope projection is too many, after can passing through suitably to raise lordosis Partial Height or reduce, the method for male portion height obtain new configuration, is repeated by the new detector configuration obtained and carries out under conventional water droplet and For Determining The Droplet Trajectories when supercool big water droplet calculates.
If when conventional water droplet and supercool big water droplet, rear portion all not having droplets impact arrive, illustrates when routine water droplet and SLD, second projection at rear portion all without freezing, the also supercool big water droplet condition of None-identified.Therefore, need configuration is improved, after this situation illustrates, bossing slope is protruding very little, reduce the height of the first projection or raise the height of the second projection in rear portion, obtain new detector configuration, the new detector configuration obtained is returned step 2 and carries out under conventional water droplet respectively and For Determining The Droplet Trajectories when supercool big water droplet calculates.
If when conventional little water droplet, water droplet only impinges upon in the first projection of detector configuration, and does not strike against on rear portion, and when SLD, first protruding and rear portion the second projection all has droplets impact to arrive, and this shows, this configuration is when SLD, rear portion can freeze, and when conventional water droplet, second projection at rear portion will not freeze, then this configuration meets the requirements, this configuration is the configuration of required design, terminates design.
Detector in the present invention includes the difference of the impact characteristics that two or more male and fomale(M&F), the slope of each coupling part and height are dripped by different-grain diameter Water Under and determines.The present invention utilizes the feature that SLD is different from conventional For Determining The Droplet Trajectories, by whether there is multiple discontinuous ice field to judge whether SLD, and the ice condition at detector configuration rear portion distinguishes the icing of SLD and conventional water droplet.
Would be likely to occur subcooled water overflow when existing method is based on SLD and cause that charging properties guess such as inconsistent grade carries out SLD icing detector configuration design, but charging properties except with drop particle diameter size mutually outside the Pass, also relevant to other conditions such as temperature, Liquid water content, the difference of charging properties can not distinguish SLD and conventional water droplet completely, For Determining The Droplet Trajectories is then unrelated with the condition such as temperature, Liquid water content, thus the present invention is based on the detector Exterior Surface Design of For Determining The Droplet Trajectories, can better distinguish the difference of SLD and the little water droplet of routine.The profile curvature design method of existing SLD icing detector lacks design considerations, too much experiment brings design process cycle length, defect costly, and the method design curve that the present invention is by droplets impact computational analysis, multiple Curvature varying profile need not be produced carry out lot of experiments and select, greatly save cost and design cycle, there is significant progress.
Applicant is by studying SLD and the feature of icing under conventional super-cooling waterdrop, by designing a kind of new detector configuration, thus detecting, whether flight environment of vehicle exists SLD condition, accurately enter condition for aircraft icing protection offer, the safe flight under aircraft ice-formation condition is had remarkable progress.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the first detector configuration water droplet trajectory figure under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 2 is the first detector configuration water droplet trajectory figure under supercool big water droplet (drop diameter d=100 micron) condition.
Fig. 3 is the second detector configuration water droplet trajectory figure under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 4 is the second detector configuration water droplet trajectory figure under supercool big water droplet (drop diameter d=100 micron) condition.
Fig. 5 is the third detector configuration water droplet trajectory figure under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 6 is the third detector configuration water droplet trajectory figure under supercool big water droplet (drop diameter d=100 micron) condition.
Fig. 7 is the 4th kind of detector configuration water droplet trajectory figure under conventional water droplet (drop diameter d=20 micron) condition.
Fig. 8 is the 4th kind of detector configuration water droplet trajectory figure under supercool big water droplet (drop diameter d=100 micron) condition.
Detailed description of the invention
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, all can by other equivalences or there is the alternative features of similar purpose replaced.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Embodiment 1
One, the design object of supercool big water droplet detector configuration is formulated.
The detector configuration of one Curvature varying of design so that it is when conventional water droplet, and water droplet will all strike the front portion of configuration, only one of which continuous print impingement region on whole detector.And when SLD, except previous section has super-cooling waterdrop to knock, after also will run into the shock of super-cooling waterdrop, show as detector occur multiple discontinuous ice field.
Below all for simplest three impingement regions, designing a detector configuration, this detector configuration includes the first protruding and rear portion, and rear portion is made up of second projection, is connected by groove between the first projection with the second projection.Namely this detector is made up of two bossings, forms the detector configuration of different changeover portion slope.The design object of this detector configuration is in that: after detector configuration, bossing (namely second is protruding) does not have ice condition when conventional super-cooling waterdrop, and ice condition is there will be when SLD, before configuration, boss (namely first is protruding), when different super-cooling waterdrop, all can freeze.Detect whether there is ice-formation condition by the ice condition of diverse location, and distinguish the icing of SLD and conventional water droplet.Namely conventional water droplet can only impinge upon in the first projection of detector configuration, and supercool big water droplet then can strike in the second projection, thereby through the difference of ice forming locations, realizes the identification to big water droplet icing detection.
Two so that when SLD, a water droplet energy part strikes previous section, and a part strikes aft section.Detector configuration must be above protruding, middle concave is entered, configuration protruding more below, the change of concavo-convex slope of a curve is the key factor of design.In the present embodiment, with a groove being similar to one the continual curvature change of elliptoid object Intermediate Gray for initial configuration, carrying out super-cooling waterdrop impact characteristics calculating, computational methods are as described below.
Super-cooling waterdrop impact characteristics computational methods mainly comprise two parts: air flow field computational methods, droplets impact computational methods.
(1) detector surrounding air Flow Field Calculation method
Carry out icing detector Design of Aerodynamic Configuration, it is necessary to calculating detector ambient air flow field.
1. governing equation
The time equal N-S equation that governing equation is low speed viscosity flow that air flow field calculates, its common version is:
In equation (1), ρaFor atmospheric density,For air velocity,WithTake different values, the transport equation of other scalars such as the equation of continuity of air field, the equation of momentum and tubulence energy can be represented.
2. the discrete method of governing equation
Adopt the discrete solving equation of finite volume method (1).The hexahedron of point centered by a P, discrete method every in equation is:
I convective term discrete
According to divergence theorem of Gauss, convective term adopts following scheme to carry out discrete
In formula (2), nb=e, w, n, s, t, b, represent six faces of control volume centered by P point respectively,For each corresponding area, the governing equation for air phase has
Variate-value on control volume interfaceThe method combined by upstream interpolation and linear interpolation calculates, and for boundary face " e ", interpolation method is
WhereinFor the amount of upstream interpolation,For the amount of linear interpolation, ε is hybrid cytokine, 0≤ε≤1.
II source item discrete
Different equations is had different expression formulas by the source item of transport equation, in order to make its discretization expression formula approach source item itself as far as possible, strengthen the main diagonal dominance of algebraic equation, improve Algebraic Equation set and seek stability of solution, adopt linearized fashion to do source item to process, even
Then the discrete form of source item is
In formula, δ V is the volume of control volume.
III time term is discrete
Time term adopts following order precision format to carry out discrete
Wherein, subscript n+1, n and n-1 represent the value of t+ Δ t, t and t-Δ t respectively.
(2) water droplet moving track calculation method
In order to determine the placement location of detector, it is necessary to the movement locus of water droplet in research detector flow field, in order to make trajectory calculation more directly perceived, we adopt Euler's method to calculate water droplet movement locus.
1. the water droplet equation of motion
Calculating water droplet moves, and is on the basis that flow field resolves, and by Newton's second law, in rectangular coordinate system, the three-dimensional water droplet equation of motion can be write as
Wherein, MdIt is water droplet quality, AdIt is the front face area of water droplet, VdIt is drop volume, ρaBeing atmospheric density, g is acceleration of gravity, CdIt is resistance coefficient, ua、va、waDistribution represents the local air velocity in x, y, z direction, ud、vd、wdDistribution represents the local water drip rate in x, y, z direction.
2. the governing equation of water droplet phase Flow Field Calculation
Introduce water droplet fraction by volume α, its volume ratio that to be defined as in the micelle of space water droplet shared mutually, then can set up the governing equation of water droplet phase, including continuity equation and the equation of momentum, be respectively as follows:
In equation (9), (10),For water drip rate, ρdFor water droplet density,For acceleration of gravity, K is inertial factor, and its expression formula is
In formula (11), μaFor air force viscosity, deqFor drop diameter, CDFor water droplet resistance coefficient, Re is relative Reynolds number, and its expression formula is
In water droplet motor process, resistance changes with the change of relative Reynolds number, and the application adopts equation below to calculate resistance:
Similar with air field governing equation, water droplet phase control equation can unify to be write as the form of transport equation:
Wherein,For source item,Take 1, ud、vdOr wdRepresent continuity equation and the equation of momentum in x, y, z direction respectively.
3. the discrete method of water droplet phase control equation
Consistent with equation (1) for equation (14), convective term and the discrete method of source item, time term adopts single order explicit discrete, namely
4. wall boundary condition
Water droplet calculates mutually, adopts wall to suck boundary condition, if i.e. water droplet and object plane collision, then it is assumed that water droplet would flow out from the point of impingement.
5. the calculating of drop collection rate
Owing to water droplet fraction by volume α is less by (10-6Magnitude), it is believed that air and water droplet are single effects, namely only consider the air effect to water droplet, ignore the water droplet effect to air.Therefore, the calculation procedure of drop collection rate can be summarized as: first, calculates air field, adopts SIMPLE method to calculate air field herein, and turbulence model is standard k-ε turbulence model；Secondly, obtaining on the basis of air flow field distribution, water droplet phase control equation is solved；Finally, drop collection rate β can at the relative velocity obtaining local water droplet fraction by volume α and water droplet and object planeAfterwards, following formula obtain:
Wherein, α∞For far field water droplet fraction by volume,For far field water drip rate,Unit normal vector for object plane point of impingement place.
For Determining The Droplet Trajectories when three, the detector configuration of design carries out conventional water droplet and SLD calculates.
Adopt said method, detector configuration is carried out the calculating of For Determining The Droplet Trajectories.It addition, aircraft freezes often in the landing stage, speed will not be too high, therefore, calculates the speed all adopting 100m/s.
Giving the first detector configuration in Fig. 1, it is carried out conventional For Determining The Droplet Trajectories and calculates, Fig. 1 gives its water droplet trajectory figure when conventional water droplet.
Meanwhile, the first detector configuration carrying out supercool big For Determining The Droplet Trajectories and calculates, Fig. 2 gives its water droplet trajectory figure when supercool big water droplet.
Result shows, no matter it is little water droplet (i.e. conventional water droplet) or big water droplet (i.e. supercool big water droplet), all can not collide at the rear portion of detector configuration, under normal circumstances, detector configuration rear portion all can not freeze, certainly, may freeze in some region at rear portion under strong flooded conditions, but the condition of strong overflow does not possess universality, and therefore, the first profile all can not realize intended design object.
It is seen that when conventional water droplet and SLD, the second projection arrives all without droplets impact, when conventional water droplet and SLD are described, the rear portion at the second protruding place is all without freezing, and this just can not identify SLD condition.Therefore, improving on the basis of the first detector configuration, this situation illustrates that the slope of the second projection is protruding very little, obtains new configuration by the method for the height of the height or reduction the first projection of suitably raising the second projection, i.e. the second detector configuration.
Four, continue to adopt said method, the second detector configuration is carried out For Determining The Droplet Trajectories calculating.Fig. 3 is the second detector configuration water droplet trajectory figure, Fig. 4 under conventional water droplet (drop diameter d=20 micron) condition is the second detector configuration water droplet trajectory figure under supercool big water droplet (drop diameter d=100 micron) condition.It can be seen that rear portion is arrived again without droplets impact in Fig. 3, Fig. 4, continue to improve to profile, rear portion slope is raised and obtains the third profile.
Five, the third profile is carried out For Determining The Droplet Trajectories calculating, can be seen that from Fig. 5, Fig. 6, after detector, the rear portion (namely second is protruding) of row has droplets impact to arrive when conventional super-cooling waterdrop and SLD, after the explanation of this situation, bossing slope projection is too many, the method of male portion height after suitably raising lordosis Partial Height or reducing can be passed through and obtain new configuration, continue to improve to profile, obtain the 4th kind of profile.
Six, the 4th kind of profile being carried out For Determining The Droplet Trajectories calculating, can find out: when conventional little water droplet from Fig. 7, Fig. 8, water droplet only impinges upon in the first projection of detector configuration；And when SLD, the first projection and the second projection have droplets impact to arrive.This shows, this configuration rear portion at the second protruding place when SLD can freeze, and when conventional water droplet, the rear portion at the second protruding place will not freeze, and this configuration meets the requirements, and namely the 4th kind of profile is the required configuration designed, and terminates design.
Result of practical application shows, the method designing supercool big water droplet (SLD) icing detector profile based on super-cooling waterdrop motion and the method clashing into numerical computations in the present invention, have that the design cycle is short, low cost and other advantages, and do not rely on other conditions such as temperature, Liquid water content, can effectively distinguish SLD to freeze with conventional water droplet, protect offer thus freezing for aircraft and accurately enter condition, the safe flight under aircraft ice-formation condition is had remarkable progress.
The invention is not limited in aforesaid detailed description of the invention.The present invention expands to any new feature disclosed in this manual or any new combination, and the step of the arbitrary new method disclosed or process or any new combination.
Claims (4)
1. the method for designing of a supercool big water droplet icing detector, it is characterised in that comprise the steps:
(1) one detector configuration of design, this detector configuration includes the first protruding and rear portion, being connected by groove between described first projection and rear portion, and wherein, described rear portion is made up of several second projections, is connected by groove between described second projection；
(2) For Determining The Droplet Trajectories that the detector configuration of step 1 design is carried out under conventional water droplet calculates, and For Determining The Droplet Trajectories when supercool big water droplet calculates；
(3) if the result of step 2 shows, when conventional water droplet and supercool big water droplet, first projection and rear portion all have the words that droplets impact arrives, illustrate when conventional water droplet and SLD, first projection and rear portion all can freeze, with regard to the supercool big water droplet condition of None-identified, raise the height of the first projection or reduce the height of the second projection in rear portion, obtain new detector configuration, the new detector configuration obtained is returned step 2 and carries out under conventional water droplet respectively and For Determining The Droplet Trajectories when supercool big water droplet calculates；
If when conventional water droplet and supercool big water droplet, rear portion does not all have the words that droplets impact arrives, illustrate when conventional water droplet and SLD, second projection at rear portion is all without freezing, also the supercool big water droplet condition of None-identified, reduce the height of the first projection or raise the height of the second projection in rear portion, obtaining new detector configuration, the new detector configuration obtained being returned step 2 and carries out under conventional water droplet respectively and For Determining The Droplet Trajectories when supercool big water droplet calculates；
If when conventional water droplet, water droplet only impinges upon in the first projection of detector configuration, and when SLD, the first projection and rear portion all has droplets impact to arrive, it was shown that this detector configuration meets the requirements, and terminates design,.
2. the method for designing of supercool big water droplet icing detector according to claim 1, it is characterized in that, in described step 3, whether there is multiple discontinuous ice field by detector configuration and judge whether supercool big water droplet, distinguished supercool big water droplet and conventional water droplet by the ice condition at detector configuration rear portion.
3. the method for designing of supercool big water droplet icing detector according to claim 1 or claim 2, it is characterised in that in described step 1, described rear portion is made up of second projection, is connected by groove between described first projection and the second projection.
4. the method for designing of supercool big water droplet icing detector according to claim 1 or claim 2, it is characterized in that, in described step 3, the described height of the first projection and the height at rear portion are based on For Determining The Droplet Trajectories result of calculation when under conventional water droplet with supercool big water droplet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610333142.9A CN106018199A (en) | 2014-09-26 | 2014-09-26 | SLD (supercooled large droplet) icing detector |
| CN201410504716.5A CN104354867B (en) | 2014-09-26 | 2014-09-26 | A kind of method for designing of supercool big water droplet icing detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410504716.5A CN104354867B (en) | 2014-09-26 | 2014-09-26 | A kind of method for designing of supercool big water droplet icing detector |
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| CN201610333142.9A Division CN106018199A (en) | 2014-09-26 | 2014-09-26 | SLD (supercooled large droplet) icing detector |
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| CN104354867A CN104354867A (en) | 2015-02-18 |
| CN104354867B true CN104354867B (en) | 2016-06-29 |
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| CN105117558B (en) * | 2015-09-13 | 2018-05-04 | 北京航空航天大学 | A kind of modeling method for the misting cooling surface liquid film distortion that unfavorable high overload induces |
| CN105865100B (en) * | 2016-04-05 | 2018-03-16 | 北京航空航天大学 | A kind of exemplar ejection type supercooling drop hits microcosmic observation system |
| CN105857621A (en) * | 2016-05-06 | 2016-08-17 | 武汉航空仪表有限责任公司 | Integrated ice detector |
| CN105836159A (en) * | 2016-05-18 | 2016-08-10 | 中国航空工业集团公司西安飞机设计研究所 | Aircraft icing detector ground test method |
| CN106569289A (en) * | 2016-10-18 | 2017-04-19 | 北京无线电测量研究所 | Method and device for recognizing supercooled water |
| CN107132278B (en) * | 2017-06-07 | 2023-04-07 | 中国空气动力研究与发展中心低速空气动力研究所 | Multi-cylinder array icing detection method |
| CN110077601A (en) * | 2019-05-16 | 2019-08-02 | 中国商用飞机有限责任公司 | Super-cooling waterdrop icing detector and mixed state icing detector |
| CN111553084B (en) * | 2020-04-30 | 2023-04-04 | 中国直升机设计研究所 | Helicopter icing detection position optimization method, electronic product and storage device |
| CN112550723B (en) * | 2020-12-25 | 2022-04-12 | 华中科技大学 | Super-cooled large water drop icing probe and detector |
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| US6269320B1 (en) * | 1998-11-19 | 2001-07-31 | Rosemount Aerospace, Inc. | Supercooled large droplet ice detector |
| US6759962B2 (en) * | 2001-04-25 | 2004-07-06 | Rosemount Aerospace Inc. | Inflight ice detector to distinguish supercooled large droplet (SLD) icing |
| EP1480008B1 (en) * | 2003-05-21 | 2014-12-31 | Prysmian Cables & Systems Limited | Method and apparatus for determining the length of a passage along which an optical fibre is to be blown |
| CN102313511B (en) * | 2010-07-02 | 2015-12-16 | 中国商用飞机有限责任公司 | Icing detector |
| CN102336272B (en) * | 2010-07-16 | 2015-01-14 | 中国商用飞机有限责任公司 | Icing detector probe and icing detector comprising same |
| CN102682144B (en) * | 2011-11-30 | 2014-02-19 | 天津空中代码工程应用软件开发有限公司 | Flight icing numerical value simulation method of helicopter rotor wing |
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