Anti-icing flute-shaped pipe device

Abstract

An anti-icing flute-shaped pipe device comprises an outer-layer pipe, an inner-layer pipe, an inner-layer pipe, an outer-layer pipe, an inner-layer pipe, an inner-layer pipe and a water pipe, the inner-layer pipe comprises an open first end and an open second end, the inner-layer pipe extends into the outer-layer pipe from the open end of the outer-layer pipe, the first end of the inner-layer pipe is communicated with the outside of the outer-layer pipe, and the second end of the inner-layer pipe is communicated with the inside of the outer-layer pipe; the outer-layer pipe and the inner-layer pipe are arranged to define a hot air backflow space between the outer-layer pipe and the inner-layer pipe, and the pipe wall of the inner-layer pipe is configured to enable hot air flow in the inner-layer pipe and hot air flow in the hot air backflow space to be capable of conducting heat exchange through the pipe wall of the inner-layer pipe. According to the flute-shaped pipe, the temperature of hot air sprayed from the spraying holes on the flute-shaped pipe along different ways can be basically the same, so that the unfavorable condition that the temperature of the hot air changes along the ways is avoided.

Description

Technical Field

[0001] The utility model relates to the field of aircraft design and manufacturing, more specifically to the field of wing anti-icing system design, and in particular to an anti-icing flute device. Background Art

[0002] Currently, civil aircraft mainly use hot air to protect their wings from ice.

[0003] To this end, the prior art generally uses a flute of a certain length (with hot gas injection holes located at different positions along the tube wall) so that the hot gas in the flute can be injected through the injection holes to the inner surface of the wing skin, thereby increasing the skin temperature through convective heat exchange between the injected hot gas and the skin to prevent icing of the wing. This flute is therefore also called an anti-icing flute.

[0004] When hot air flows in the flute, the temperature decreases as the flow distance increases. There are two main reasons for this phenomenon:

[0005] First, the flute will exchange heat with the surrounding environment along the way;

[0006] Secondly, hot gas nozzles are arranged along the flute-shaped tube. When the hot gas in the flute-shaped tube is ejected from the nozzles, it will be accelerated to the speed of sound due to the pressure difference between the inside and outside of the tube, which will cause the static temperature to drop during the acceleration process.

[0007] In order to ensure that the desired anti-icing effect can still be achieved at the end of the anti-icing flute, the common practice in the prior art is to increase the temperature of the hot air at the inlet of the flute accordingly.

[0008] It is easy to imagine that after adopting this approach, the longer the length of the flute, the higher the temperature at the inlet of the flute must be increased.

[0009] However, excessively increasing the temperature at the flute inlet will have at least the following two adverse effects:

[0010] First, the temperature at the entrance of the flute is too high. When the hot air in the tube is ejected, it will cause high-temperature damage or rapid thermal fatigue to the skin or nearby structures.

[0011] Second, the excessively high temperature at the entrance of the flute will cause corresponding energy waste, increase the aircraft operating costs, and reduce the competitiveness of the model. Utility Model Content

[0012] Based on the deficiencies of the current technical solutions, the utility model provides an anti-icing flute pipe mainly used in wing anti-icing systems. The flute pipe can ensure that the temperature of hot air ejected from the nozzles at different paths on the flute pipe is basically the same, thereby avoiding the unfavorable situation that the hot air temperature changes along the path.

[0013] To this end, the utility model provides an anti-icing flute device, comprising:

[0014] An outer tube, the outer tube comprising an open end and a closed end, and having hot gas injection holes at different locations along the tube wall of the outer tube; and

[0015] An inner tube, the inner tube comprising an open first end and a second end, the inner tube extending from the open end of the outer tube into the interior of the outer tube, and the first end of the inner tube communicating with the exterior of the outer tube, and the second end of the inner tube communicating with the interior of the outer tube,

[0016] in,

[0017] The outer tube and the inner tube are arranged to define a hot gas reflow space between them, and the tube wall of the inner tube is configured so that the hot gas flow in the inner tube and the hot gas reflow space can exchange heat through the tube wall of the inner tube.

[0018] By forming the above-mentioned hot gas reflow space, when the hot gas flows in the interlayer, since the hot gas nozzles are arranged on the outer tube, when the hot gas flows to the nozzles, part of it is ejected from the corresponding nozzles to heat the skin surface. The temperature of the anti-icing hot gas will continue to drop due to temperature loss when it flows along the way. The temperature at the entrance of the inner tube is the highest, and the temperature at the rib plate end of the outer tube is the lowest. The inner tube can exchange heat with the flowing gas on both sides, with the high-temperature end of the hot gas at the inner tube and the low-temperature end in the hot gas reflow space to achieve the effect of balancing the axial temperature, so that the hot gas temperature in the hot gas reflow space remains basically consistent.

[0019] According to a preferred embodiment of the anti-icing flute device of the utility model, a connecting rib is provided between the inner tube and the outer tube to fix the inner tube relative to the outer tube.

[0020] According to a preferred embodiment of the anti-icing flute tube device of the utility model, the connecting rib is arranged at the open end of the outer tube.

[0021] According to a preferred embodiment of the anti-icing flute tube device of the utility model, the connecting rib is configured to partially or completely block the open end of the outer tube together with the inner tube.

[0022] According to a preferred embodiment of the anti-icing flute device of the utility model, the inner tube and the outer tube are coaxially arranged to define an annular sandwich space between the inner tube and the outer tube.

[0023] According to a preferred embodiment of the anti-icing whistle device of the utility model, the inner tube has a diameter d, the outer tube has a diameter D, and the inner tube and the outer tube are configured such that D2 =2d 2 .

[0024] In the case where the diameter of the inner casing of the double-casing anti-icing flared tube is smaller than that of the outer casing, the above diameter relationship helps to keep the gas flow speeds in the inner and outer casings basically consistent.

[0025] According to a preferred embodiment of the anti-icing flute device of the present invention, the second end of the inner tube is arranged close to the closed end of the outer tube.

[0026] According to a preferred embodiment of the anti-icing flute device of the utility model, an airflow guide vane is arranged in the closed end of the outer tube to guide the hot air flow leaving the second end of the inner tube to the hot air return space.

[0027] According to a preferred embodiment of the anti-icing flute tube device of the utility model, the closed end of the outer tube includes a detachable plugging cover.

[0028] According to a preferred embodiment of the anti-icing flute tube device of the utility model, an airflow guide vane is arranged on the plug cover inside the closed end of the outer tube to guide the hot air flow leaving the second end of the inner tube to the hot air return space.

[0029] When hot air flows in the double-layer sleeve flute tube of the utility model, the flow direction makes a 180-degree turn at the outlet of the inner tube, and the provision of the airflow guide blades helps to reduce the flow resistance. In other words, the airflow guide blades guide the airflow to deflect the direction, thereby reducing the flow resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] This document includes the accompanying drawings to provide a further understanding of the various embodiments, and the accompanying drawings are incorporated in and constitute a part of this specification.

[0031] The drawings illustrate the various embodiments described herein, and together with the description serve to explain the principles and operations of the claimed subject matter.

[0032] With reference to the above purposes, the technical features of the present invention are clearly described below, and its advantages are apparent from the following detailed description with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention by way of example without limiting the scope of the present invention.

[0033] In the attached figure:

[0034] Figure 1 It is a three-dimensional schematic diagram of a preferred embodiment of the anti-icing flute device according to the utility model, wherein the internal and invisible structure is shown with dotted lines.

[0035] Figure 2It is a cross-sectional view of another preferred embodiment of the anti-icing piccolo tube device according to the utility model along a section passing through the longitudinal axis of the tube and the hot gas injection hole.

[0036] Reference numerals list

[0037] 100 Outer tube

[0038] 110 Open end

[0039] 120 Closed End

[0040] 130 Hot air injection hole

[0041] 200 Inner tube

[0042] 210 First End

[0043] 220 Second End

[0044] 300 Connecting ribs

[0045] 400 Airflow guide vanes DETAILED DESCRIPTION

[0046] Reference will now be made in detail to embodiments of the present invention, examples of which are shown in the accompanying drawings and described below.

[0047] Although the utility model will be described in conjunction with exemplary embodiments, it should be appreciated that this specification is not intended to limit the utility model to those exemplified embodiments. On the contrary, the utility model is intended to cover not only these exemplary embodiments, but also various alternative forms, modified forms, equivalent forms and other embodiments that can be included in the spirit and scope of the utility model.

[0048] In order to facilitate explanation and accurately define the technical solutions of the present invention, the terms “upper”, “lower”, “inner” and “outer” are used to describe features of the exemplary embodiments shown in the drawings with reference to their positions.

[0049] Various preferred but non-limiting embodiments of the anti-icing piccolo device of the present invention will be described in detail below with reference to the accompanying drawings.

[0050] Figure 1 and Figure 2Each of the figures shows an anti-icing flute device according to a preferred embodiment of the utility model. The device includes an outer tube 100 and an inner tube 200. Since the structure is mainly composed of two layers of pipelines, this type of anti-icing flute can also be called a double-layer sleeve type anti-icing flute. It should also be pointed out that although the preferred embodiment here only includes two layers of pipelines, those skilled in the art can also further set more layers of pipelines on the basis of the two layers of pipelines according to actual needs, as long as the flow path of the gas can meet the following heat transfer requirements.

[0051] The outer tube 100 includes an open end 110 located on the left side of the drawing and a closed end 120 located on the right side of the drawing. In other words, the outer tube 100 is a blind tube with one end open, that is, a tube with one end open and the other end closed.

[0052] It should be noted here that the closed end 120 can be integrally formed with other parts of the outer tube 100 as a single piece, or the closed end 120 can be configured to include a detachable plugging cover, such as Figure 2 The plugging cover can be connected to the outer layer pipe 100 by screwing.

[0053] As shown in the accompanying drawings, hot gas injection holes 130 located at different locations along the path are opened on the tube wall of the outer tube 100. Along the path in this article refers to the path length or distance through which the gas flow actually flows. Although the hot gas injection holes 130 in the orientation of the accompanying drawings all inject hot gas upward, it should be pointed out that the actual use conditions of the flute tube are not limited to this, but the hot gas injection holes 130 can also inject hot gas downward or in other radial directions. In actual use, the hot gas injection holes 130 of the flute tube can generally be used to inject hot gas in the cavity onto the skin to heat the skin. It should also be pointed out that the number, shape, position distribution and aperture size of the hot gas injection holes 130 schematically shown in the figure are only examples, and those skilled in the art can further adjust the number, shape, position distribution and aperture size of the injection holes according to the actual structure of the anti-icing cavity.

[0054] The inner tube 200 includes a first end 210 located on the left side of the drawing and open, and a second end 220 located on the right side of the drawing and also open. In other words, both ends of the inner tube 200 are open, so that the airflow can enter the inner tube 200 from the first end 210 of the inner tube 200 and then flow out from the second end 220 through the pipe section of the inner tube 200.

[0055] The inner tube 200 extends from the open end 110 of the outer tube 100 into the inner part of the outer tube 100. In the figure, the inner tube 200 extends into the inner part of the outer tube 100 from left to right.

[0056] In a preferred embodiment, as shown in the figure, the second end 220 of the inner tube 200 can be arranged close to the closed end 120 of the outer tube 100. In other words, in this preferred embodiment, the second end 220 of the inner tube 200 extends as far as possible into the outer tube 100 to approach the closed end at the inner bottom of the outer tube 100.

[0057] In the preferred embodiment shown in the drawings, a connecting rib 300 may be provided between the inner tube 200 and the outer tube 100 to fix the inner tube 200 relative to the outer tube 100. However, in an alternative embodiment not shown in the drawings, the inner tube 200 may be fixed relative to the outer tube 100 by other connectors or fasteners or by form fit or force fit, which will not be described in detail herein.

[0058] Now continue to refer to Figure 1 and Figure 2 The specific form of the connecting rib 300 will be described.

[0059] In the preferred embodiment shown in the figure, the connecting rib 300 can be arranged at the open end 110 of the outer tube 100. In other alternative embodiments, the connecting rib 300 can also be alternatively or additionally arranged at other suitable positions between the inner tube 200 and the outer tube 100.

[0060] like Figure 1 As clearly shown in the figure, in this preferred embodiment, three connecting ribs 300 evenly distributed around the inner tube 200 may be provided. However, those skilled in the art may also provide more or fewer connecting ribs 300 evenly or unevenly distributed in the circumferential direction in other embodiments, as long as they can achieve the corresponding fixing effect.

[0061] In the preferred embodiment shown in the figure, the connecting rib 300 is configured to partially or completely block the open end 110 of the outer tube 100 together with the inner tube 200. In this case, the connecting rib 300 can be designed to occupy a certain area on the cross section of the open end 110, such as a certain fan-shaped area, or the connecting rib 300 can have other suitable shapes according to actual needs, which will not be repeated here.

[0062] The connecting rib plate 300 may preferably be a whole annular mounting plate, the inner tube 200 is arranged in the hole of the annular mounting plate, and the annular mounting plate is installed in the outer tube 100. The inner tube 200 and the annular mounting plate, as well as the outer tube 100 and the annular mounting plate, may be detachably or non-detachably mounted and fixed to each other by connection methods including but not limited to threading, welding, etc.

[0063] Furthermore, the first end 210 of the inner tube 200 is in communication with the outside of the outer tube 100, and the second end 220 of the inner tube 200 is in communication with the inside of the outer tube 100. In order to enable the second end 220 of the inner tube 200 to be in communication with the inside of the outer tube 100, it is understood by those skilled in the art that the axial extension of the inner tube 200 in the outer tube 100 is smaller than the tube length of the outer tube 100.

[0064] The outer tube 100 and the inner tube 200 are arranged so as to define a hot gas reflow space between the outer tube 100 and the inner tube 200. In addition, according to the basic concept of the present invention, the tube wall of the inner tube 200 is configured so that the hot gas flow in the inner tube 200 and the hot gas flow in the hot gas reflow space can exchange heat through the tube wall of the inner tube 200. In this way, for the orientation shown in the drawings, the hot gas enters from the first end 210 of the inner tube 200 and flows to the right. When the hot gas reaches the second end 220 of the inner tube 200, the hot gas entering the inner tube 200 comes out of the inner tube 200 and reaches the closed end 120 of the outer tube 100. Then, the hot gas turns back from the closed section 120 and enters the hot gas reflow space between the inner tube 200 and the outer tube 100, and reflows to the left along the hot gas reflow space.

[0065] With respect to the above-mentioned hot gas reflow space, preferably, the inner tube 200 and the outer tube 100 may be coaxially arranged to define an annular sandwich space between the inner tube 200 and the outer tube 100 .

[0066] More specifically, in the above-mentioned coaxial arrangement, the inner tube 200 has a diameter d, and the outer tube 100 has a diameter D. In order to insert the inner tube 200 into the outer tube 100, it is understood by those skilled in the art that the diameter of the inner tube 200 should be smaller than the diameter of the outer tube 100. Preferably, the inner tube 200 and the outer tube 100 can be configured such that D 2 Basically equal to 2d 2 .

[0067] like Figure 2 As shown in FIG. 1 , in a preferred embodiment, an airflow guide vane 400 may be provided in the closed end 120 of the outer tube 100 to guide the hot air flow leaving the second end 220 of the inner tube 200 to the hot air return space.

[0068] On the plugging cover, an airflow guide vane 400 is provided in the closed end 120 of the outer tube 100 to guide the hot air flow leaving the second end 220 of the inner tube 200 to the hot air return space. The guide vane 400 may be as follows: Figure 2 In that way, it appears in the form of a quarter arc in the cross-sectional view, but it can also appear in other forms that are beneficial to guiding the gas flow in the flow path, which will not be described in detail here.

[0069] In a preferred embodiment in which the closed end 120 of the outer tube 100 has a plugging cover, the airflow guide vane 400 may be preferably disposed on the plugging cover and may be removed together with the plugging cover.

[0070] More preferably, if Figure 2 As shown in FIG. 4 , the airflow guide vane 400 may also be mounted on a vane support to better orient the vane to improve the guiding effect on the airflow.

[0071] The above describes various preferred embodiments of the double-layer sleeve type anti-icing flute pipe of the utility model. Figure 2 In the embodiment, the hot gas flow path of the double-layer tube-type flute is air supply → first end 210 of the inner tube 200 → interior of the inner tube 200 → second end 220 of the inner tube 200 → air flow guide vanes 400 → hot gas return space → each hot gas injection hole of the outer tube 100 .

[0072] Specifically, when the hot air flows in the hot air reflow space, since the hot air injection holes 130 are arranged on the outer tube 100, when the hot air flows to the hot air injection holes 130, part of the hot air is ejected from the corresponding hot air injection holes 130 to heat the skin surface.

[0073] On the one hand, when the hot air is sprayed onto the skin surface, heat exchange will occur, so the temperature of the hot air will drop after flowing through the skin surface, that is, the temperature of the gas in the anti-icing cavity is lower than the temperature of the hot air in the flute.

[0074] On the other hand, when the hot air flows in the hot air recirculation space, heat exchange will occur between the hot air and the surface of the outer tube 100, so that the anti-icing hot air will have temperature loss when flowing along the outer tube 100, and the temperature will continue to drop.

[0075] At this time, the temperature at the entrance of the inner tube 200 is the highest, and the corresponding hot gas temperature at the outer tube 100 is the lowest. The inner tube 100 can exchange heat with the gas flowing at the corresponding positions inside and outside, and heat the low-temperature end of the hot gas in the hot gas return space with the high-temperature end of the hot gas in the inner tube to achieve the effect of balancing the axial temperature, so that the hot gas temperature in the hot gas return space remains basically consistent along the way, so that the temperature of the ejected hot gas is basically consistent, which is convenient for adjusting the hot gas temperature at the inlet end as needed, so that the temperature does not exceed the upper limit that the structural material can tolerate, and is not lower than the minimum temperature that can achieve wing skin anti-icing.

[0076] In order to verify the actual effect of the utility model, simulation calculations were carried out for this example. In order to analyze the temperature uniformity effect of the double-layer casing of this embodiment relative to the existing single-layer casing, a single-layer casing control group was set in the calculation.

[0077] The corresponding boundary conditions of the single-layer casing control group are: single-layer flute length 816mm, single-layer flute diameter 25mm, flute nozzle diameter 3.15mm, flute nozzle spacing 31mm, inlet gas pressure 2.1bar, inlet gas temperature 192℃.

[0078] Calculation results of the temperature distribution and temperature drop along the single-layer flute tube show that the temperature drop along the flute tube is about 30°C, and there is no nozzle area at the end of the flute tube. The hot air flow velocity in the tube in this area is 0, so the temperature drops faster, but the lack of hot air ejection has no effect on the performance of the flute tube.

[0079] The corresponding boundary conditions of the double-layer casing group are: the length of the flute tube is 816 mm, the diameter of the inner flute tube is 25 mm, the diameter of the outer flute tube is 36 mm, the diameter of the nozzle on the flute tube is 3.15 mm, the spacing between the nozzles on the flute tube is 31 mm, the inlet gas pressure is 2.1 bar, and the inlet gas temperature is 192 ° C. That is, only the flute tube structure is changed from single-layer to double-layer, and other conditions remain unchanged.

[0080] After calculation, the temperature distribution and temperature drop along the double-layer flute tube show that due to the structural difference, the double-layer casing can still exchange temperature with the hot gas in the inner tube when flowing in the outer layer. The overall temperature drop along the path drops from about 30°C for the single-layer flute tube to about 5°C for the double-layer flute tube, achieving the purpose of making the hot gas more uniform along the flute tube and realizing the expected technical effect.

[0081] Preferred embodiments of the present invention have been described in detail above, but it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0082] Various changes can be readily appreciated in light of the above detailed description, and can be made to the embodiments described herein.

[0083] In general, in the claims, the terms used should not be considered limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which the claims are entitled.

Claims

1. An anti-icing flute device, It is characterized in that include: An outer tube (100), the outer tube (100) comprising an open end (110) and a closed end (120), and hot gas injection holes (130) located at different positions along the tube wall of the outer tube (100); and An inner tube (200), the inner tube (200) comprising an open first end (210) and a second end (220), the inner tube (200) extending from the open end (110) of the outer tube (100) into the interior of the outer tube (100), and the first end (210) of the inner tube (200) is in communication with the exterior of the outer tube (100), and the second end (220) of the inner tube (200) is in communication with the interior of the outer tube (100), in, The outer tube (100) and the inner tube (200) are arranged to define a hot gas reflow space between the outer tube (100) and the inner tube (200), and the tube wall of the inner tube (200) is configured so that the hot gas flow in the inner tube (200) and the hot gas flow in the hot gas reflow space can exchange heat through the tube wall of the inner tube (200).

2. The anti-icing whistle device according to claim 1, It is characterized in that A connecting rib (300) is provided between the inner layer tube (200) and the outer layer tube (100) to fix the inner layer tube (200) relative to the outer layer tube (100).

3. The anti-icing piccolo device according to claim 2, It is characterized in that The connecting rib (300) is arranged at the open end (110) of the outer layer tube (100).

4. The anti-icing piccolo device according to claim 2, It is characterized in that The connecting rib (300) is configured to partially or completely block the open end (110) of the outer layer tube (100) together with the inner layer tube (200).

5. The anti-icing piccolo device according to claim 1, It is characterized in that The inner layer tube (200) and the outer layer tube (100) are coaxially arranged to define an annular sandwich space between the inner layer tube (200) and the outer layer tube (100).

6. The anti-icing piccolo device according to claim 1, It is characterized in that The inner tube (200) has a diameter d, the outer tube (100) has a diameter D, and the inner tube (200) and the outer tube (100) are configured such that D 2 =2d 2 .

7. The anti-icing piccolo device according to claim 1, It is characterized in that The second end (220) of the inner tube (200) is arranged close to the closed end (120) of the outer tube (100).

8. The anti-icing piccolo device according to claim 1, It is characterized in that An airflow guide vane (400) is arranged inside the closed end (120) of the outer tube (100) to guide the hot air flow leaving the second end (220) of the inner tube (200) to the hot air return space.

9. The anti-icing piccolo device according to claim 1, It is characterized in that The closed end (120) of the outer tube (100) comprises a detachable plugging cover.

10. The anti-icing piccolo device according to claim 9, It is characterized in that An airflow guide vane (400) is arranged on the plug cover inside the closed end (120) of the outer tube (100) to guide the hot air flow leaving the second end (220) of the inner tube (200) to the hot air return space.

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