CN116201701A - Design method of hybrid deicing system based on icing characteristics of fan blades - Google Patents
Design method of hybrid deicing system based on icing characteristics of fan blades Download PDFInfo
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- CN116201701A CN116201701A CN202310034258.2A CN202310034258A CN116201701A CN 116201701 A CN116201701 A CN 116201701A CN 202310034258 A CN202310034258 A CN 202310034258A CN 116201701 A CN116201701 A CN 116201701A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/60—Cooling or heating of wind motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a design method of a hybrid deicing system based on icing characteristics of fan blades, and belongs to the technical field of wind power generation. Based on wind tunnel icing test, the actual condition of the fan blade is combined, the time and space development characteristics of the blade icing are obtained, and a database of the areas and the thicknesses of the icing occurrence and growth in different time periods is established. The method comprises the steps of comprehensively screening out areas which are difficult to freeze according to the icing characteristics of the blades in different freezing grades, solving the ice prevention and removal requirements of the blades by using an air-heat deicing method, and assisting in using an electric heating ice prevention and removal method in other areas; meanwhile, the rated power of the electric heating film is customized according to the difference of the ice coating strength of the blade. After the system is put into operation, by combining the icing characteristic database with icing monitoring, only the gas-heat deicing system or the hybrid deicing system for comprehensively controlling gas heat and electric heat is operated in different freezing days, so that the fan blade has an efficient ice preventing and removing function under the full-weather condition and is low in energy consumption.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a design method of a hybrid deicing system based on icing characteristics of fan blades.
Background
In wind farms in regions of low wind speeds in the south and in parts of high wind speeds, there is a severe freezing problem in winter and spring. Icing appears on the wind turbine generator blade, the pneumatic appearance and the weight distribution of the blade are changed, the load balance of the blade is broken, the vibration of the blade and the wind wheel is caused, and the like, and the economic efficiency and the safety of the operation and the power production of the wind turbine generator are directly influenced.
Based on the stored wind power with larger cardinal number at present, the urgent need of the efficient deicing technology for the wind turbine generator blades in the freezing weather is met. At present, the method for preventing and removing ice includes active ice preventing and removing modes such as a gas-heat deicing/electrothermal deicing method, a chemical deicing method and a mechanical deicing method based on hot melting ice, and passive ice preventing modes such as an ice coating preventing method based on super-hydrophobic coating spraying.
At present, no mature technology (or combination) for preventing and removing ice of the wind turbine generator blades can be widely popularized and applied, in fact, due to the difference of environments and icing climates of the wind turbine generator blades, the problems or risks of high energy consumption, short service life, high equipment and operation and maintenance cost, lightning damage and the like exist in the technology for preventing and removing ice of the wind turbine generator blades to different extents, and the application bottleneck of the method for preventing and removing ice of the wind turbine generator blades in a single technical route is caused. For example, in the air-heat deicing technology, due to the difference of the weak heat conduction property and thickness distribution of the blade material, a high-efficiency and low-energy-consumption deicing effect cannot be realized on the whole blade; electrothermal deicing technology does not require excessive consideration of heat transfer, but has lightning strike risk (electrothermal deicing of whole blades increases lightning strike risk, etc.); the super-hydrophobic anti-icing coating can only resist ice and cannot remove ice, and the anti-icing function of the coating can be invalid in severe freezing weather.
In view of the limitation of a single deicing technology, the wind turbine blade can be considered to adopt a hybrid deicing mode, and if a plurality of deicing technologies are simply overlapped, high design, manufacturing, installation and operation and maintenance costs are brought, and in addition, the deicing effect is poor and the energy consumption is high in actual operation.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a design method of a hybrid deicing system based on the icing characteristics of fan blades, which can enable the fan blades to have an efficient ice preventing and removing function under all weather conditions (including extremely frozen weather), and is low in construction cost and energy consumption.
The invention is realized by the following technical scheme:
a design method of a hybrid deicing system based on fan blade icing characteristics comprises the following steps:
s1: collecting and analyzing the environment and meteorological factors of the wind turbine generator, and determining meteorological parameter combinations for the blade icing characteristic test;
s2: reducing and manufacturing a blade icing test model according to the blade condition of the actual wind turbine generator;
s3: in the wind tunnel test facility, based on the meteorological parameter combination determined in the step S1 and the blade icing test model prepared in the step S2, the normal operation parameters of the wind turbine are combined, and the icing environment characteristics of the blades of the wind turbine are restored; observing the icing characteristic of the blade icing test model to obtain the space-time characteristic of blade surface icing;
s4: carrying out quantitative analysis on the space-time characteristics of the icing on the surface of the blade, which is obtained in the step S3, so as to obtain the evolution rule of the icing of the blade in different time periods after the icing begins to form, and obtaining an icing characteristic database;
s5: based on the icing characteristic database obtained in the step S4, respectively selecting icing conditions of the blades in various typical weather including extremely icing weather, and comprehensively determining boundaries of an air-heat independent deicing area and an air-heat/electric-heat mixed deicing area;
s6: designing an air-heat deicing system based on a numerical simulation method, optimizing operation parameters, and then updating and supplementing an air-heat independent deicing area by combining the temperature distribution condition of the outer surface of the blade;
s7: and (3) installing an electric heating film in an air-heat/electric-heat mixed deicing area outside the air-heat independent deicing area, customizing rated power of the electric heating film at each position, and completing the design of the blade mixed deicing system.
Preferably, in S1, the environmental and meteorological factors include wind speed, air pressure, air temperature, humidity and granularity distribution of supercooled water drops in the air.
Preferably, in S1, the meteorological parameter combination includes main meteorological features capable of reflecting normal icing weather and extreme icing weather of the wind turbine.
Preferably, in S2, the blade condition includes surface material, airfoil, length and surface roughness.
Preferably, in S3, the icing characteristics include a type of blade icing, a generation zone, and a formation speed.
Preferably, S4 is specifically: based on the space-time characteristics of the icing on the surface of the blade, which is obtained in the step S3, the time and space development characteristics of the icing on the blade in different levels of freezing climates are analyzed, the rules of the icing occurrence area and thickness development at different spreading positions of the blade are obtained, the critical thickness of the icing deterioration condition in a specific time is determined, and an icing characteristic database of the specific blade in different freezing climates in the environment is formed.
Preferably, S5 is specifically: based on the icing characteristic database obtained in the step S4, combining the icing conditions of the blade in various typical icing climates, comprehensively determining the boundary of an air-heat independent deicing area and an air-heat/electric-heat mixed deicing area; in extreme icing climates, respectively selecting a position forming a specific icing thickness within a preset time after icing begins to appear and a region close to the tail edge of the blade as an independent air-heat deicing region; the rest area of the blade is an air-heat/electric-heat mixed deicing area.
Preferably, S6 is specifically: by combining a conventional hot blast deicing technology, observing the difference of the effect of hot blast on blade heating based on a numerical simulation method, and adjusting and iteratively optimizing hot blast conveying parameters, so that the surface temperature of the blade corresponding to an independent air-heat deicing area is not lower than 0.5-1.5 ℃, and the maximum heating air temperature is not higher than 70 ℃; and updating and supplementing the independent deicing area of the air heat by combining with the condition of optimizing the temperature distribution of the outer surface of the blade under the hot air conveying parameters.
Preferably, S7 is specifically: and (3) adding an electric heating film in an air-heat/electric-heat mixed deicing area outside the air-heat independent deicing area, and differentially determining the rated power of the electric heating film by combining the temperature distribution of the outer surface of the blade, the heat conduction rate of the inner part of the blade and the icing characteristic database.
Preferably, under normal icing climate conditions, based on an icing characteristic database, the operation parameters of the gas-heat deicing system are adjusted by combining with an icing monitoring system, so that the blade ice prevention and removal requirement in lighter freezing weather is realized; and in severe or extremely frozen weather, the operation power of the electric heating film in each area on the blade is optimized by combining the icing monitoring and icing characteristic database of the electric heating film paving area, and the blade icing is removed by utilizing the air-heat deicing system and the electric heat storage and combination system.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the design method of the hybrid deicing system based on the fan blade icing characteristics, disclosed by the invention, the icing formation and development rules of the target blade are combined, the efficient deicing system and the running mode are customized and designed, the design method is greatly different from a hybrid technology in which a plurality of deicing technologies are simply overlapped on the same blade, and the technical difficulty is relatively higher. The method is characterized in that the size of the blade is large, the relative speeds of the wing profiles at different positions in the direction of the expanding direction of the blade and the incoming flow of the atmosphere are different, so that the interaction between vapor or tiny water drops in the atmosphere and the blade is different, the ice coating stroke is directly influenced, a certain rule and difference are realized between the formation and development processes of the whole ice coating on the blade, and the mixed ice preventing and removing system is designed based on the rule characteristics, so that the method has the advantages of reducing equipment requirements, reducing system energy consumption, reducing lightning protection risks and the like.
According to the method, the region with lower icing degree on the upper surface and the lower surface of the blade is comprehensively selected, and the ice preventing and removing effect is realized by optimizing the operation parameters of the gas-heat deicing system; in other areas with higher icing degree, blade tips and the like are small in thickness, partial deicing effect can be achieved by means of operation of the air-heat deicing system, contribution and icing severity of the air-heat deicing system are comprehensively considered in the remaining areas, laying of an electric heating film is assisted, rated power of the electric heating film can be selected quantitatively, customized design of deicing requirements of the whole blade is achieved, and the deicing requirements of the wind turbine generator set on blades with different degrees of freezing weather under specific environments are met.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific embodiments, which are intended to be illustrative rather than limiting.
As shown in FIG. 1, the design method of the hybrid deicing system based on the icing characteristics of the fan blades of the invention firstly collects and sorts environmental and meteorological factors (including but not limited to wind speed, air pressure, air temperature, humidity, granularity distribution of supercooled water drops in air and the like) aiming at a specific wind turbine to be designed according to the hybrid deicing scheme, combines the historical extreme weather conditions when the most severe icing condition of the fan blades of the wind turbine, and selects and designs a plurality of groups of meteorological parameter combinations to be used for the icing characteristics test of the fan blades. The choice and design of the combination of meteorological parameters should reflect the main meteorological features of normal freezing weather and severe (extreme) freezing weather in which the unit is located.
Secondly, reducing and manufacturing the same blade icing test model based on blade conditions (such as surface materials, wing profiles, lengths, surface roughness and the like) of the target fan for preventing and removing ice;
then, in the blade icing wind tunnel test facility, based on the meteorological data setting and the test blade design, the icing environment characteristics of the blades of the wind turbine generator are set and restored by combining the normal operation (such as rotating speed and the like) of the wind turbine generator.
And carrying out a blade icing test, and observing icing characteristics of the blades of the wind turbine generator, including the type, the generation area, the formation speed and the like of the blade icing, so as to obtain space-time characteristics of blade surface icing, namely icing appearance and development characteristics developed along with time.
The test result is quantitatively analyzed, and in combination with the existing icing theory, icing mainly occurs at the blade tip and the front edge of the middle and rear sections of the blade, and because the relative speed of the blade tip and the air inflow is higher, tiny supercooled water drops in the air collide with the faster blade, and the supercooled water drops are easier to change in morphology, namely are converted into solid state and are adhered to the collision area to form icing; in the middle and rear sections of the blade, the leading edge thereof is susceptible to icing, which is due to the fact that the incoming air flow collides with the leading edge first. In contrast, icing occurs at other parts of the blade, and more because of the influence on the overall aerodynamic shape of the blade and the like after the front edge and the like are frozen, the ice layer gradually spreads and grows.
And (5) quantitatively analyzing the time and space development characteristics of the icing of the blade surface. Setting critical values of serious (or out-of-control) situations of ice coating of the blades at different blade spreading positions, such as a certain critical value of the area occupied by the ice coating in the chord direction of the blade within a specific time after the ice coating starts to appear, or a critical value of the thickness of the ice coating at a specific position of the blade within a specific time, and the like. Beyond this threshold, the blade will soon be covered entirely by the ice coating that grows to spread due to the failure of the aerodynamic properties of the blade.
Under the above setting, based on the analysis result of the icing time-space characteristics of the blade, the icing evolution rule (comprising icing region and thickness development and the like) of the whole blade under different icing climates is obtained, an icing characteristic database is formed, and based on the database, the time of icing at the specific blade position, the evolution of the thickness of the ice layer along with the time and the like can be inquired. Generally, icing occurs in a blade area (such as a blade tail edge) which is not easy to freeze in a specific time after icing occurs, on one hand, the air-operated appearance of the blade is changed due to icing occurring at a front edge and the like, the icing-resistant property of a corresponding area is affected, and on the other hand, the icing is possibly grown and spread.
And respectively selecting ice coating conditions of the blades in various typical weather including extreme icing weather in the ice coating characteristic database, and comprehensively determining boundaries of the gas-heat deicing area and the gas-heat/electric heating hybrid deicing area. Preferentially, in extreme icing climates, positions with specific thickness are respectively selected after icing begins to appear (such as icing with thickness exceeding 2mm in 30 min), and the regions close to the tail edges of the blades are used as the deicing range of the gas-heat deicing technology, namely, the region can realize the deicing effect only by means of the gas-heat deicing system. The selected areas may be suitably adjusted in combination with the icing characteristics in general icing climates.
When the air-heat deicing system operates, based on the industrial general hot blast deicing technology, after hot air is conveyed into the inner cavity of the blade from the air conveying pipe, the whole blade starts to be heated, and due to the thickness difference between the blade in the expanding direction and the chord direction and the air temperature reduction of the conveyed hot air in the flowing process, under the designed air conveying parameters (temperature, flow, air pressure of the outlet of the air conveying pipe and the like), the heating effect of the selected blade area is different, and the difference exists in the surface temperature of the blade.
And observing the difference of the heating effect of the hot blast on the blade by using a numerical simulation method, namely modeling the target blade, and observing the flow of a runner in the blade and the heat transfer process based on the parameter of the conveying wind by considering the boundary condition setting between the atmospheric environment and the blade in extremely icing weather.
After simulation convergence, observing the temperature distribution of the outer surface of the blade in the delimited area, combining with a blade icing characteristic database, wherein the temperature of the outer surface of the blade is not lower than 0.5-1.5 ℃ in the place where icing is required to appear in the selected area, wherein actually, the temperature of the outer surface exceeds 0 ℃, supercooled water drops in air are hard to collide with the surface of the blade to form icing, and the icing spreading and growing in the area is also facilitated to melt, so that the expected ice preventing and removing effect is realized.
And optimizing and adjusting the wind conveying parameters of the air-heat deicing system, wherein the wind temperature cannot exceed the maximum allowable wind temperature (70-75 ℃ in general) in the blade, so as to meet the requirement of the temperature of the outer surface of the blade in the delimited area as an iteration constraint condition, comprehensively comparing the energy consumption of the air-heat deicing system, and obtaining an optimized parameter combination. And removing the area which is covered with ice and has poor heating effect due to the thickness of the blade and the like from the delimited area.
Meanwhile, based on a numerical simulation result, the outer surface temperature distribution condition of other areas of the blade (namely, the positions where icing occurs earlier and icing is serious, such as the front edge of the blade, the blade tip and the like) is observed under the designed input hot air parameters, and the air-heat deicing system is operated based on the thinner blade tip and the like, so that even if the icing condition is serious at the position, the problem of preventing and removing ice can be successfully solved by only relying on the air-heat deicing system. Selecting the area with the temperature of the outer surface of the blade exceeding 1.5 ℃ and supplementing the area.
The blade area outside the delimited area is the area with serious ice coating occurrence and growth and the area with poor hot blast heating effect. In the area, an electric heating film is additionally arranged, a regional electric heating deicing system is constructed, and a deicing mode of air heating and electric heating mixing is realized for the whole blade. And combining the temperature distribution of the outer surface of the blade, the heat conduction rate of the inner part of the blade and the icing characteristic database, comprehensively considering the difference of icing intensity of each region in severe icing climate, and carrying out customized design, namely differentially selecting rated power of the electric heating film at each position in the region to form an overall design scheme.
And finally, in the construction stage of preventing and removing ice of the target wind turbine blade, firstly, performing aero-thermal deicing transformation in the blade, and then paving an electric heating film on a selected area of the outer surface.
The method mainly aims at the specific icing climate where the reconstruction target unit is located, and the gas-heat deicing area and the electrothermal deicing system are subjected to customized design, so that the deicing requirement of the unit in the extremely icing climate is ensured. And under normal icing conditions, the gas-heat and electric-heat system (or the gas-heat deicing system operated independently) operates at lower power, so that the deicing requirement of the blade can be met. Specifically, based on a blade icing characteristic database formed by experimental analysis, the operation parameters of the aero-thermal deicing system are adjusted by combining the icing monitoring system, so that the blade ice prevention and removal requirement in lighter freezing weather can be realized. Once icing is detected in the area where the electrothermal deicing system is arranged, the operational power of electrothermal films in each area can be regulated in a differentiated mode by combining a blade icing characteristic database, and blade icing is cooperatively removed. The gas-heat and electric-heat hybrid deicing system combines the icing characteristic database and the surface icing monitoring system, so that the efficient deicing requirement of the target fan under the historical full-climate condition is realized, and the energy consumption of the system is reduced by the optimized combination of the operation modes.
The invention provides a design and an operation method of a hybrid efficient ice control system combining wind turbine generator blades with hot blast and electric heating technologies. According to the method, the actual conditions of the environment, weather, parameters of the blades of the wind turbine generator are improved by combining the deicing technique, and the like, the time and space development characteristics of icing of the blades of the wind turbine generator are obtained based on wind tunnel icing tests, and databases of the areas, thickness and the like of icing and growth of the blades in different time periods are established. According to the method, the ice coating characteristics of the blade in different freezing grades are combined, the area which is difficult to freeze on the suction surface and the pressure surface of the blade is comprehensively screened, the ice removing requirement of the blade is met by the air-heat deicing method, the electric heating ice removing method is assisted in the rest areas of the blade, and meanwhile, the rated power of the electric heating film is selected in a targeted manner according to the difference of the ice coating intensity of the blade. After the system is put into operation, by combining the blade icing characteristic database and icing monitoring, only the gas-heat deicing system or the hybrid deicing system for comprehensively controlling gas heat and electric heat is operated in different freezing weather, so that the fan blade has an efficient ice preventing and removing function in all weather conditions (including extremely freezing weather), and has the characteristics of low energy consumption of the system and the like.
It is to be understood that the foregoing description is only a part of the embodiments of the present invention, and that the equivalent changes of the system described according to the present invention are included in the protection scope of the present invention. Those skilled in the art can substitute the described specific examples in a similar way without departing from the structure of the invention or exceeding the scope of the invention as defined by the claims, all falling within the scope of protection of the invention.
Claims (10)
1. The design method of the hybrid deicing system based on the icing characteristics of the fan blade is characterized by comprising the following steps of:
s1: collecting and analyzing the environment and meteorological factors of the wind turbine generator, and determining meteorological parameter combinations for the blade icing characteristic test;
s2: reducing and manufacturing a blade icing test model according to the blade condition of the actual wind turbine generator;
s3: in the wind tunnel test facility, based on the meteorological parameter combination determined in the step S1 and the blade icing test model prepared in the step S2, the normal operation parameters of the wind turbine are combined, and the icing environment characteristics of the blades of the wind turbine are restored; observing the icing characteristic of the blade icing test model to obtain the space-time characteristic of blade surface icing;
s4: carrying out quantitative analysis on the space-time characteristics of the icing on the surface of the blade, which is obtained in the step S3, so as to obtain the evolution rule of the icing of the blade in different time periods after the icing begins to form, and obtaining an icing characteristic database;
s5: based on the icing characteristic database obtained in the step S4, respectively selecting icing conditions of the blades in various typical weather including extremely icing weather, and comprehensively determining boundaries of an air-heat independent deicing area and an air-heat/electric-heat mixed deicing area;
s6: designing an air-heat deicing system based on a numerical simulation method, optimizing operation parameters, and then updating and supplementing an air-heat independent deicing area by combining the temperature distribution condition of the outer surface of the blade;
s7: and (3) installing an electric heating film in an air-heat/electric-heat mixed deicing area outside the air-heat independent deicing area, customizing rated power of the electric heating film at each position, and completing the design of the blade mixed deicing system.
2. The method for designing a hybrid deicing system based on fan blade icing characteristics of claim 1, wherein in S1, said environmental and meteorological factors comprise wind speed, air pressure, air temperature, humidity, and the particle size distribution of supercooled water droplets in air.
3. The method for designing a hybrid deicing system based on icing characteristics of fan blades as recited in claim 1, wherein in S1, said combination of meteorological parameters comprises main meteorological features reflecting normal icing weather and extreme icing weather of a wind turbine.
4. The method of designing a hybrid deicing system based on fan blade icing characteristics of claim 1, wherein in S2, said blade conditions comprise surface material, airfoil, length, and surface roughness.
5. The method of designing a hybrid de-icing system based on fan blade icing characteristics of claim 1, wherein in S3, the icing characteristics include type of blade icing, area of occurrence and formation rate.
6. The design method of the hybrid deicing system based on the fan blade icing characteristics of claim 1, wherein S4 specifically comprises: based on the space-time characteristics of the icing on the surface of the blade, which is obtained in the step S3, the time and space development characteristics of the icing on the blade in different levels of freezing climates are analyzed, the rules of the icing occurrence area and thickness development at different spreading positions of the blade are obtained, the critical thickness of the icing deterioration condition in a specific time is determined, and an icing characteristic database of the specific blade in different freezing climates in the environment is formed.
7. The design method of the hybrid deicing system based on the fan blade icing characteristics of claim 1, wherein S5 specifically comprises: based on the icing characteristic database obtained in the step S4, combining the icing conditions of the blade in various typical icing climates, comprehensively determining the boundary of an air-heat independent deicing area and an air-heat/electric-heat mixed deicing area; in extreme icing climates, respectively selecting a position forming a specific icing thickness within a preset time after icing begins to appear and a region close to the tail edge of the blade as an independent air-heat deicing region; the rest area of the blade is an air-heat/electric-heat mixed deicing area.
8. The method for designing a hybrid deicing system based on fan blade icing characteristics of claim 1, wherein S6 is specifically: by combining a conventional hot blast deicing technology, observing the difference of the effect of hot blast on blade heating based on a numerical simulation method, and adjusting and iteratively optimizing hot blast conveying parameters, so that the surface temperature of the blade corresponding to an independent air-heat deicing area is not lower than 0.5-1.5 ℃, and the maximum heating air temperature is not higher than 70 ℃; and updating and supplementing the independent deicing area of the air heat by combining with the condition of optimizing the temperature distribution of the outer surface of the blade under the hot air conveying parameters.
9. The method for designing a hybrid deicing system based on fan blade icing characteristics of claim 1, wherein S7 specifically comprises: and (3) adding an electric heating film in an air-heat/electric-heat mixed deicing area outside the air-heat independent deicing area, and differentially determining the rated power of the electric heating film by combining the temperature distribution of the outer surface of the blade, the heat conduction rate of the inner part of the blade and the icing characteristic database.
10. The design method of the hybrid deicing system based on the icing characteristics of the fan blade according to claim 1, wherein under normal icing climatic conditions, the operational parameters of the aero-thermal deicing system are adjusted based on an icing characteristic database in combination with an icing monitoring system to realize blade ice control requirements in lighter freezing weather; and in severe or extremely frozen weather, the operation power of the electric heating film in each area on the blade is optimized by combining the icing monitoring and icing characteristic database of the electric heating film paving area, and the blade icing is removed by utilizing the air-heat deicing system and the electric heat storage and combination system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117404262A (en) * | 2023-11-24 | 2024-01-16 | 湖南防灾科技有限公司 | Control method and controller of fan air-heat deicing system based on fuzzy control |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117404262A (en) * | 2023-11-24 | 2024-01-16 | 湖南防灾科技有限公司 | Control method and controller of fan air-heat deicing system based on fuzzy control |
| CN117404262B (en) * | 2023-11-24 | 2024-06-04 | 湖南防灾科技有限公司 | Control method and controller of fan air-heat deicing system based on fuzzy control |
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