CN212429304U - Anti-icing wind tunnel blade - Google Patents
Anti-icing wind tunnel blade Download PDFInfo
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- CN212429304U CN212429304U CN201922126692.5U CN201922126692U CN212429304U CN 212429304 U CN212429304 U CN 212429304U CN 201922126692 U CN201922126692 U CN 201922126692U CN 212429304 U CN212429304 U CN 212429304U
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Abstract
The utility model discloses an anti-icing wind tunnel blade, wherein a flat petiole block is inserted into a groove of a foam core, a boss of the foam core is inserted into a boss accommodating groove of the flat block, and the flat petiole block is firmly attached to the foam core; the connection waist accommodating hole of the carbon beam is sleeved on the flat connection waist of the petiole, the vertical connection wall of the carbon beam is tightly attached to the end surface where the connection waist of the flat block of the petiole is positioned, and the upper wall and the lower wall of the carbon beam are tightly attached to the upper accommodating groove and the lower accommodating groove of the foam core; each layer of the skin is sealed, tightly wrapped, bonded and adhered to the outside of the foam core and the carbon beam, and an electric heating unit component is tightly wrapped and fixed on one layer or two layers of carbon fiber prepreg cloth or glass fiber prepreg cloth layers below the surface of the skin at the front edge of the blade body; the connecting lead of the electric heating unit component is led out through the petiole wiring hole and the hollow cylinder; the whole is put in a mould to be pressed, heated, cured and molded. The utility model discloses petiole, foam core and carbon roof beam joint strength are high, and blade strength is high, light in weight, and long service life no longer appears freezing phenomenon at wind-tunnel blade leading edge under wet cold environment.
Description
Technical Field
The utility model belongs to the technical field of the wind-tunnel compressor, a anti-icing wind-tunnel blade is related to.
Background
The wind tunnel is a basic device for carrying out aerodynamic tests, when the wind tunnel runs, energy for maintaining gas flow is provided by driving an axial flow fan by a motor, energy consumption of airflow in a wind tunnel pipeline is specifically shown in that pressure is reduced, the axial flow fan is used for improving pressure of the airflow, when the two reach balance, the wind tunnel can stably run, the power of the general wind tunnel is very high, the power of the axial flow fan is required to be very high, otherwise, a large amount of wind energy loss can be caused, and various performance indexes of a test section of the wind tunnel are influenced.
At present, in the process of manufacturing a carbon beam of a metal petiole composite carbon fiber foam core structure blade, after the metal petiole is inserted into a foam core, carbon beam prepreg is directly paved on the surfaces of the metal petiole and the foam core in a layered mode, the defect is that the joint of the steel petiole and the foam core is weak, the foam core at the joint is easy to break through hundreds of layered paving and pressing, so that the fiber paving pressure is low in the layered paving process, the paved layers are loose, and the density is poor. In addition, no matter the foam core is PMI machine-formed or foam molding, the back edge is very thin, and in the laying prepreg process, the back edge foam often meets the rupture phenomenon, needs to use the glued membrane to bond it fixedly, and work efficiency is low and the fiber laying is not compact. These all result in the low strength of current wind tunnel blade, and steel petiole, foam core and carbon beam joint strength are low, short service life. In the icing wind tunnel, icing phenomenon can occur on the front edge of the conventional wind tunnel blade in a wet and cold environment, so that the icing can cause large vibration to cause that the test cannot be continued when the icing reaches a certain degree, and meanwhile, equipment in the icing wind tunnel can be damaged due to the falling of ice blocks.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above-mentioned problem that exists among the prior art, provide an anti-icing wind tunnel blade, its steel petiole, foam core and carbon beam joint strength are high, long service life, and wind tunnel blade leading edge is freezing phenomenon no longer appearing under wet cold environment.
In order to achieve the above object, the technical solution of the present invention is: an anti-icing wind tunnel blade comprises a metal blade handle, a foam core, a carbon beam, a skin comprising 5-10 layers of carbon fiber prepreg cloth or glass fiber prepreg cloth and an electric heating unit component; the shape of the foam core is the same as that of the blade body of the blade, one end of the foam core, which is provided with a blade handle, is provided with a groove for accommodating the blade handle, the working surface and the non-working surface of the foam core are respectively provided with an upper accommodating groove and a lower accommodating groove of the upper wall and the lower wall of the carbon beam, and two flat bosses are raised on the bottom surface of the groove; one end of the petiole is a hollow cylinder with an installation step on the excircle, the other end of the petiole extending into the foam core is a flat block completely matched with the groove of the foam core, and a narrow flat connecting waist is arranged between the hollow cylinder and the flat block; one end of the flat block, which is far away from the hollow cylinder, is provided with a central lightening hole communicated with the hollow cylinder and boss accommodating grooves which are arranged on two sides of the lightening hole and are completely matched with two bosses of the foam core, and the side surface of the flat block, which is close to the connecting waist, is provided with a wire routing hole of an electric heating unit component communicated with the central lightening hole; the carbon beam comprises a vertical connecting wall at the end of the blade handle and an upper wall and a lower wall which are integrated with the vertical connecting wall, the shape and the size of the end surface where the connecting waist of the vertical connecting wall and the blade handle flat block is positioned are completely the same, the center of the vertical connecting wall is provided with a connecting waist accommodating hole, and the shape and the size of the upper wall and the size of the lower wall are respectively and completely matched with the upper accommodating groove and the lower accommodating groove of the foam core; the shape of the electric heating unit component is the same as that of the front edge of the blade body; the flat petiole block is inserted into the groove of the foam core, the boss of the foam core is inserted into the boss accommodating groove of the flat block, and the flat petiole block is tightly attached to the foam core; the connection waist accommodating hole of the carbon beam is sleeved on the flat connection waist of the petiole, the vertical connection wall of the carbon beam is tightly attached to the end surface where the connection waist of the flat block of the petiole is positioned, and the upper wall and the lower wall of the carbon beam are tightly attached to the upper accommodating groove and the lower accommodating groove of the foam core; each layer of the skin is sealed, tightly wrapped, bonded and adhered to the outside of the foam core and the carbon beam, and an electric heating unit component is tightly wrapped and fixed on one layer or two layers of carbon fiber prepreg cloth or glass fiber prepreg cloth layers below the surface of the skin at the front edge of the blade body; the connecting lead of the electric heating unit component is led out through the wiring hole of the petiole and the hollow of the cylinder; the whole is put in a mould to be pressed, heated, cured and molded.
Further preferably, the depth of the electric heating unit assembly at the working face end for wrapping the leading edge of the blade body is more than 80mm, and the depth of the electric heating unit assembly at the non-working face end for wrapping the leading edge of the blade body is more than 130 mm.
Further preferably, the electrical heating unit assembly is a carbon nano electrical heating unit assembly, which comprises one or more insulation protection layers on an inner layer, a carbon nano tube membrane electrical heating unit assembly and one or more insulation protection layers on an outer layer in sequence from inside to outside; the insulating protective layer is a glass fiber prepreg layer. The thickness of the carbon nano tube film electric heating sheet assembly is only 0.01mm, the weight is light, the thermal expansion coefficient is small, the deformation after heating can be ignored, the blade structure can not be damaged after heating, and the carbon nano tube film electric heating sheet assembly can be spread along with the change of the blade airfoil shape, so that the use is very convenient.
Preferably, the carbon nanotube film electric heating sheet assembly consists of five identical carbon nanotube film electric heating sheets connected in series by copper sheets, and a gap of one electric heating sheet is arranged between every two adjacent electric heating sheets; the five carbon nanotube film electric heating sheets except the two wiring terminals are sealed, tightly attached, clamped and fixed in the inner and outer insulating protective layers with slightly larger sizes, and then folded in half, so that the two electric heating sheets are just positioned in the gaps between the other three electric heating sheets, and the two wiring terminals are led out from the upper part and the lower part of the petiole direction of the electric heating sheets.
Further preferably, the inner multi-layer insulating protective layer comprises an inner cured glass fiber prepreg shell and a soft glass fiber prepreg shell with an outer layer next to the carbon nanotube film electric heating sheet assembly; the outer multi-layer insulation protection layer comprises a soft glass fiber prepreg shell, a middle solidified glass fiber prepreg shell and an outer soft glass fiber prepreg shell, wherein the inner layer of the soft glass fiber prepreg shell is close to the carbon nano tube membrane electric heating plate component. The prepreg glue of the cured glass fiber prepreg cloth shell fills gaps of the glass fiber cloth, and prevents burrs of the carbon fiber prepreg cloth of the skin from entering along pores of the glass fiber prepreg cloth and contacting with the carbon nanotube film electric heating sheet assembly to cause heating failure of the carbon nanotube film electric heating sheet assembly.
The carbon beam of the utility model is an integrated piece, the carbon beam mould is separately manufactured, the operation is convenient, the production efficiency is high, bubbles between prepreg layers can be forced to be pressed out, the foam core is not damaged, and the compactness and the strength of each layer of paved carbon fiber prepreg cloth are high; and the carbon beam can wrap the flat block of the metal blade handle integrally, and the upper wall and the lower wall are accurately fixed in the upper accommodating groove and the lower accommodating groove of the foam core, so that the integral strength of the blade is improved, and the service life of the blade is prolonged. And when each layer of skin and the electric heating unit assembly are paved in the mold cavity, the pressure-bearing strength of the foam core is high, the foam core is not easy to damage, and the process is relatively simple. The blade front edge is paved with the electric heating unit component, so that the phenomenon of icing of the wind tunnel blade front edge can be effectively prevented, the occurrence of large vibration of the blade caused by icing is avoided, the test is smoothly carried out, and the damage to equipment in the wind tunnel caused by the falling of ice blocks caused by icing is also avoided. Especially, when the electrical heating unit assembly is the carbon nanometer electrical heating unit assembly, the thickness of the carbon nanometer film electrical heating sheet assembly is only 0.01mm, the weight is light, the thermal expansion coefficient is small, the deformation after heating can be ignored, the blade structure can not be damaged after heating, and the layer can be formed along with the change of the blade airfoil shape, so that the use is very convenient.
In a word, the carbon beam is used as a main bearing part of the blade, and the carbon beam has strong compactness of a layer and high strength; the corresponding blades have high strength, and the service life of the wind tunnel blades is prolonged; and the icing phenomenon of the front edge of the wind tunnel blade does not occur under the wet and cold environment.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view AA in FIG. 1;
FIG. 3 is a cross-sectional view BB of FIG. 1;
FIG. 4 is a schematic structural view of the foam core of the present invention;
FIG. 5 is a schematic view of the structure of the metal petiole of the present invention;
fig. 6 is a schematic structural view of a medium carbon beam according to the present invention;
fig. 7 is a schematic structural view of a carbon nanotube film electric heating sheet assembly of the middle electric heating unit assembly of the present invention;
fig. 8 is a schematic structural diagram of the front edge of the blade according to the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-8, the present embodiment includes a metal petiole 3, a foam core 2, a carbon beam 5, a skin 1 comprising 5-10 layers of carbon fiber prepreg (which may also be glass fiber prepreg), and an electrical heating unit assembly 4. The shape of the foam core 2 is the same as that of the blade body of the blade, one end of the foam core, which is provided with the blade handle 3, is provided with a groove 21 for accommodating the blade handle 3, the working surface and the non-working surface of the foam core are respectively provided with an upper accommodating groove 23 and a lower accommodating groove of the upper wall 52 and the lower wall 53 of the carbon beam 5, and the bottom surface of the groove 21 is convexly provided with two flat bosses 22; and 24 is the leading edge. One end of the petiole 3 is a hollow cylinder 36 with an installation step on the excircle, the other end extending into the foam core 2 is a flat block 37 completely matched with the groove 21 of the foam core, and a narrow flat connecting waist 31 is arranged between the hollow cylinder 36 and the flat block 37; the end of the flat block 37 far from the hollow cylinder 36 is provided with a central lightening hole 33 communicated with the hollow cylinder 36 and boss accommodating grooves 32 and 34 on both sides of the lightening hole 33 and completely matched with the two bosses 22 of the foam core, and the side surface of the flat block near the connecting waist 31 is provided with a wire routing hole 35 of the electric heating unit assembly 4 communicated with the central lightening hole 33. The carbon beam 5 comprises a vertical connecting wall 54 at the petiole end and upper and lower walls 52 and 53 integrated with the vertical connecting wall 54, the shape and the size of the end surface 38 of the vertical connecting wall 54, where the connecting waist 31 of the petiole flat block 37 is located, are completely the same, a connecting waist accommodating hole 54 is formed in the center of the vertical connecting wall, and the shape and the size of the upper and lower walls 52 and 53 are respectively and completely matched with the upper accommodating groove 23 and the lower accommodating groove of the foam core 2. The electrical heating unit 4 is shaped identically to the leading edge of the blade body. The flat petiole block 37 is inserted into the groove 21 of the foam core 2, the boss 22 of the foam core 2 is inserted into the boss accommodating grooves 32 and 34 of the flat block 37, and the flat petiole block 37 is tightly attached to the foam core 2. The connecting waist receiving hole 54 of the carbon beam 5 is sleeved on the flat connecting waist 31 of the petiole, the vertical connecting wall 54 thereof is tightly attached to the end surface 38 where the connecting waist 31 of the flat block of the petiole is positioned, and the upper and lower walls 52 and 53 thereof are tightly attached to the upper and lower receiving grooves of the foam core 2. Each layer of the skin 1 is sealed, tightly wrapped, bonded and bonded outside the foam core 2 and the carbon beam 5, and an electric heating unit component 4 is tightly wrapped and fixed on one layer or two layers of carbon fiber prepreg cloth or glass fiber prepreg cloth layers below the surface of the skin 1 at the front edge of the blade body; the connecting leads of the electric heating unit assembly 4 are led out through the wiring holes 35 of the petioles 3 and the hollow of the cylinder. The whole is put in a mould to be pressed, heated, cured and molded.
Preferably, the depth of the electric heating unit assembly 4 wrapping the leading edge of the blade body at the working face end is more than 80mm, and the depth of the leading edge of the blade body wrapping the non-working face end is more than 130 mm.
Preferably, the electrical heating unit assembly 4 is a carbon nano electrical heating unit assembly, which comprises one or more insulation protection layers on an inner layer, a carbon nano tube membrane electrical heating unit assembly and one or more insulation protection layers on an outer layer in sequence from inside to outside; the insulating layer and the insulating protective layer are both glass fiber prepreg layers.
Preferably, the carbon nanotube film electric heating plate assembly is composed of five identical carbon nanotube film electric heating plates 42 connected in series by copper sheets 45, and a gap 43 of one electric heating plate is arranged between every two adjacent electric heating plates 42. Five carbon nanotube film electric heating sheets 42 except the two connecting terminals 41 and 44 are tightly sealed, clamped and fixed in the inner and outer insulating protective layers with slightly larger sizes, and then folded along the bending line 46, so that the two electric heating sheets 42 are just positioned in the gap 43 between the other three electric heating sheets 42, and the two connecting terminals 41 and 44 are led out in the direction of the petioles of the electric heating sheets 42.
Preferably, the inner multi-layer insulating protective layer comprises an inner cured fiberglass prepreg housing 47 and an outer soft fiberglass prepreg housing 46 adjacent the carbon nanotube film electric heating plate assembly 4. The outer multi-layer insulating protective layer comprises an inner soft fiberglass prepreg shell 46 adjacent to the carbon nanotube film electrical heater assembly, a middle cured fiberglass prepreg shell 47, and an outer soft fiberglass prepreg shell 46.
Naturally, the invention also relates to other embodiments, and those skilled in the art can make corresponding changes and modifications according to the invention without departing from the spirit and substance of the invention, and these corresponding changes and modifications should be considered as improvements in the equivalent technology, and fall within the scope of protection of the claims of the invention.
Claims (6)
1. An anti-icing wind tunnel blade comprises a metal blade handle, a foam core, a carbon beam and a skin comprising 5-10 layers of carbon fiber prepreg cloth or glass fiber prepreg cloth; the method is characterized in that: it also includes an electrically heated cell assembly; the shape of the foam core is the same as that of the blade body of the blade, one end of the foam core, which is provided with a blade handle, is provided with a groove for accommodating the blade handle, the working surface and the non-working surface of the foam core are respectively provided with an upper accommodating groove and a lower accommodating groove of the upper wall and the lower wall of the carbon beam, and two flat bosses are raised on the bottom surface of the groove; one end of the petiole is a hollow cylinder with an installation step on the excircle, the other end of the petiole extending into the foam core is a flat block completely matched with the groove of the foam core, and a narrow flat connecting waist is arranged between the hollow cylinder and the flat block; one end of the flat block, which is far away from the hollow cylinder, is provided with a central lightening hole communicated with the hollow cylinder and boss accommodating grooves which are arranged on two sides of the lightening hole and are completely matched with two bosses of the foam core, and the side surface of the flat block, which is close to the connecting waist, is provided with a wire routing hole of an electric heating unit component communicated with the central lightening hole; the carbon beam comprises a vertical connecting wall at the end of the blade handle and an upper wall and a lower wall which are integrated with the vertical connecting wall, the shape and the size of the end surface where the connecting waist of the vertical connecting wall and the blade handle flat block is positioned are completely the same, the center of the vertical connecting wall is provided with a connecting waist accommodating hole, and the shape and the size of the upper wall and the size of the lower wall are respectively and completely matched with the upper accommodating groove and the lower accommodating groove of the foam core; the shape of the electric heating unit component is the same as that of the front edge of the blade body; the flat petiole block is inserted into the groove of the foam core, the boss of the foam core is inserted into the boss accommodating groove of the flat block, and the flat petiole block is tightly attached to the foam core; the connection waist accommodating hole of the carbon beam is sleeved on the flat connection waist of the petiole, the vertical connection wall of the carbon beam is tightly attached to the end surface where the connection waist of the flat block of the petiole is positioned, and the upper wall and the lower wall of the carbon beam are tightly attached to the upper accommodating groove and the lower accommodating groove of the foam core; each layer of the skin is sealed, tightly wrapped, bonded and adhered to the outside of the foam core and the carbon beam, and an electric heating unit component is tightly wrapped and fixed on one layer or two layers of carbon fiber prepreg cloth or glass fiber prepreg cloth layers below the surface of the skin at the front edge of the blade body; the connecting lead of the electric heating unit component is led out through the wiring hole of the petiole and the hollow of the cylinder; the whole is put in a mould to be pressed, heated, cured and molded.
2. An anti-icing wind tunnel blade according to claim 1, characterised in that: the electric heating unit assembly is a carbon nano electric heating unit assembly and sequentially comprises one or more insulating and protecting layers on an inner layer, a carbon nano tube membrane electric heating sheet assembly and one or more insulating and protecting layers on an outer layer from inside to outside; the insulating protective layers are all glass fiber prepreg layers.
3. An anti-icing wind tunnel blade according to claim 2, characterised in that: the inner multi-layer insulation protective layer comprises an inner cured glass fiber prepreg shell and a soft glass fiber prepreg shell of which the outer layer is close to the carbon nano tube membrane electric heating sheet component; the outer multi-layer insulation protection layer comprises a soft glass fiber prepreg shell, a middle solidified glass fiber prepreg shell and an outer soft glass fiber prepreg shell, wherein the inner layer of the soft glass fiber prepreg shell is close to the carbon nano tube membrane electric heating plate component.
4. An anti-icing wind tunnel blade according to claim 2 or 3, characterised in that: the carbon nano tube film electric heating sheet assembly consists of five identical carbon nano tube film electric heating sheets connected in series by copper sheets, and a gap of one electric heating sheet is arranged between every two adjacent electric heating sheets; the five carbon nanotube film electric heating sheets except the two wiring terminals are sealed, tightly attached, clamped and fixed in the inner and outer insulating protective layers with slightly larger sizes, and then folded in half, so that the two electric heating sheets are just positioned in the gaps between the other three electric heating sheets, and the two wiring terminals are led out from the upper part and the lower part of the petiole direction of the electric heating sheets.
5. An anti-icing wind tunnel blade according to claim 1, 2 or 3 wherein: the depth of the electric heating unit component at the working face end for wrapping the front edge of the blade body is more than 80mm, and the depth of the electric heating unit component at the non-working face end for wrapping the front edge of the blade body is more than 130 mm.
6. An anti-icing wind tunnel blade according to claim 4, wherein: the depth of the electric heating unit component at the working face end for wrapping the front edge of the blade body is more than 80mm, and the depth of the electric heating unit component at the non-working face end for wrapping the front edge of the blade body is more than 130 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922126692.5U CN212429304U (en) | 2019-12-03 | 2019-12-03 | Anti-icing wind tunnel blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922126692.5U CN212429304U (en) | 2019-12-03 | 2019-12-03 | Anti-icing wind tunnel blade |
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| CN212429304U true CN212429304U (en) | 2021-01-29 |
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| CN201922126692.5U Active CN212429304U (en) | 2019-12-03 | 2019-12-03 | Anti-icing wind tunnel blade |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412827A (en) * | 2021-12-22 | 2022-04-29 | 集美大学 | Integrated carbon fiber fan blade and forming method thereof |
| CN115163555A (en) * | 2022-07-18 | 2022-10-11 | 江苏航宇航空装备制造有限公司 | Carbon fiber blade used at low temperature |
| CN115266013A (en) * | 2022-09-23 | 2022-11-01 | 中国空气动力研究与发展中心超高速空气动力研究所 | Lining cylinder for high-flow high-temperature high-pressure high-speed gas environment and mounting method |
-
2019
- 2019-12-03 CN CN201922126692.5U patent/CN212429304U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412827A (en) * | 2021-12-22 | 2022-04-29 | 集美大学 | Integrated carbon fiber fan blade and forming method thereof |
| CN114412827B (en) * | 2021-12-22 | 2024-04-19 | 集美大学 | Integrated carbon fiber fan blade and forming method thereof |
| CN115163555A (en) * | 2022-07-18 | 2022-10-11 | 江苏航宇航空装备制造有限公司 | Carbon fiber blade used at low temperature |
| CN115163555B (en) * | 2022-07-18 | 2024-02-13 | 江苏航宇航空装备制造有限公司 | Carbon fiber blade used at low temperature |
| CN115266013A (en) * | 2022-09-23 | 2022-11-01 | 中国空气动力研究与发展中心超高速空气动力研究所 | Lining cylinder for high-flow high-temperature high-pressure high-speed gas environment and mounting method |
| CN115266013B (en) * | 2022-09-23 | 2022-12-02 | 中国空气动力研究与发展中心超高速空气动力研究所 | Lining cylinder for high-flow high-temperature high-pressure high-speed gas environment and mounting method |
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