Aircraft ozone converter with built-in vortex generator

Abstract

The invention discloses an aircraft ozone converter with a built-in vortex generator. The aircraft ozone converter comprises a shell, the vortex generator, a catalyst, a catalyst carrier combination and a wrapping material, the shell is of a structure with an inlet expanded and an outlet contracted, and a vortex generator is arranged on the inner wall of the inlet expanded section. The catalyst carrier combination is of a porous structure and is fixed in the middle in the shell, and the catalyst is attached to the inner surface of the porous structure of the catalyst carrier combination so as to carry out catalytic chemical reaction on ozone passing through airflow; and the outer circumference of the catalyst carrier combination is coated with a coating material. According to the invention, the aerodynamic resistance can be reduced while the ozone catalytic efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of aviation technology, and in particular to an aircraft ozone converter with a built-in vortex generator. Background Art

[0002] In the stratosphere of the earth's atmosphere, the airflow is smooth, there are few clouds, and the visibility is high. When an aircraft cruises in the stratosphere, the flight is safer and the energy consumption is lower. During the flight of an aircraft, the air in the cabin needs to be purified and recycled, and some of the exhaust gas is discharged outside the cabin. At the same time, an appropriate amount of air outside the cabin is introduced to supplement it. The atmosphere in the stratosphere contains a high concentration of ozone, which can absorb a large amount of ultraviolet rays and protect the earth's creatures from the ultraviolet rays of the sun. However, when the ozone outside the cabin enters the cabin, it becomes one of the main pollutants in the cabin. When it exceeds a certain dose, it will cause serious harm to the human body. The International Civil Aviation Organization (ICAO) has formulated international standards, and the aircraft flight certification standards have strictly limited the ozone concentration in the cabin. While controlling the amount of air intake, the aircraft environmental control system (ESC) will filter and purify the introduced high-altitude air, thereby providing a safe and comfortable atmospheric environment in the cabin. As part of the environmental control system, the ozone converter has a built-in carrier with a catalyst attached to remove ozone and other pollutants. This device ensures that the ozone concentration inside the cabin does not exceed a safe level when the aircraft passes through airspace with a high ozone concentration level. In the environmental control system, the ozone converter will cause a large flow resistance, which will bring great flow losses to the internal air flow. Therefore, while improving the ozone catalytic efficiency, reducing aerodynamic resistance is of great significance to improving the overall performance of the ozone converter of the aircraft environmental control system. Summary of the invention

[0003] In view of this, the present invention provides an aircraft ozone converter with a built-in vortex generator, which can reduce aerodynamic resistance while improving ozone catalytic efficiency.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An aircraft ozone converter with a built-in vortex generator comprises a housing, a vortex generator, a catalyst, a catalyst carrier assembly and a wrapping material;

[0006] The shell has an expanded inlet and contracted outlet structure, and a vortex generator is provided on the inner wall of the expanded inlet section; the catalyst carrier assembly is a porous structure fixed in the middle of the shell, and the catalyst is attached to the inner surface of the porous structure of the catalyst carrier assembly to catalyze a chemical reaction on ozone in the airflow; the outer circumference of the catalyst carrier assembly is coated with the wrapping material.

[0007] Furthermore, the shell is divided into an inlet expansion section, an intermediate catalytic section and an outlet contraction section;

[0008] The inlet expansion section has an inclination angle of α, which is an acute angle less than 45°; the outlet contraction section has an inclination angle of β, α>β; and the middle catalytic section is a cylindrical structure.

[0009] Furthermore, a vortex generator is provided on any one or more of the inner wall of the inlet expansion section, the inner wall of the middle catalytic section, and the inner wall of the outlet contraction section.

[0010] Furthermore, the vortex generator is a combination of one or more structures selected from the group consisting of shark fin, delta wing, triangular prism, triangular pyramid, tetrahedron, cuboid, cube, cylinder and cone.

[0011] Furthermore, the vortex generator is a shark fin structure.

[0012] Furthermore, the vortex generators are arranged in any one or more forms of a circular array, a linear array or a non-linear arrangement.

[0013] Furthermore, the catalyst carrier assembly is composed of more than one cylindrical carrier arranged in layers, and the cylindrical carrier is a honeycomb beam cavity array porous structure, and the holes are regular hexagons.

[0014] Furthermore, the wrapping material is asbestos, glass wool or rock wool.

[0015] Beneficial effects:

[0016] 1. The vortex generators provided in the expansion section of the present invention can cut and crush the low-energy fluid in the inner wall boundary layer, breaking the large-scale separation vortex into small-scale vortices, thereby delaying the separation of low-energy flow, reducing the flow loss caused by the separation vortex, reducing its total pressure loss, and improving aerodynamic efficiency. The porous structure of the catalyst carrier combination can improve the ozone catalytic efficiency.

[0017] Secondly, the wrapping material can provide a buffering protection and a certain degree of thermal insulation.

[0018] 2. The inlet expansion section of the present invention has an inclination angle of α, and the outlet contraction section has an inclination angle of β, α>β, which can reduce aerodynamic losses and improve flow efficiency.

[0019] 3. The catalyst carrier assembly of the present invention is composed of more than one cylindrical carrier, which is easy to install and can ensure the attachment rate of the catalyst on each cylindrical carrier unit; secondly, the catalyst carrier of the present invention adopts a honeycomb beam cavity array porous structure, which has strong stability and permeability, improves the structural strength of the catalyst carrier, and allows air to pass smoothly and efficiently. Compared with wave carriers and square hole carriers, it has a larger catalyst attachment area, stronger structural stability, and smaller air resistance, so that the ozone catalytic removal effect is better.

[0020] 4. The shark fin-shaped vortex generator used in the present invention has a better effect of improving flow conditions and can improve aerodynamic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention (the inlet is a perspective view).

[0022] Figure 2 It is a cross-sectional front view of the shell of the present invention.

[0023] Figure 3 It is the front view of the shell of the present invention.

[0024] Figure 4 This is a three-dimensional view of the vortex generator of the present invention.

[0025] Figure 5 It is a top view of the vortex generator of the present invention.

[0026] Figure 6 Schematic diagram of the cylindrical carrier structure of the present invention.

[0027] Figure 7 It is an enlarged view of the catalyst of the present invention attached to a cylindrical carrier.

[0028] Among them, 1-shell, 2-flange, 3-vortex generator, 4-catalyst, 5-cylindrical carrier, 6-wrapping material. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0030] The present invention provides an aircraft ozone converter with a built-in vortex generator, which is applied to a gas inerting system of an aircraft, such as Figure 1 As shown, the aircraft ozone converter includes a housing 1 , a vortex generator 3 , a catalyst 4 , a catalyst carrier assembly and a wrapping material 6 .

[0031] The shell 1 is a structure with an expanded inlet and a contracted outlet, and a vortex generator 3 is provided on the inner wall of the expanded inlet section; the catalyst carrier assembly is a porous structure, and is fixed in the middle of the shell 1 by a flange 2 on the inner wall of the shell 1, and the catalyst 4 is attached to the inner surface of the porous structure of the catalyst carrier assembly to catalyze a chemical reaction on ozone in the airflow; the outer circumference of the catalyst carrier assembly is coated with a wrapping material 6 to play a role of buffering protection and heat preservation, and the wrapping material 6 is made of materials such as asbestos, glass wool, rock wool, etc. that can withstand a certain high temperature.

[0032] Specifically, Figure 2 , 3As shown, the shell 1 is divided into an inlet expansion section, an intermediate catalytic section and an outlet contraction section; the inlet expansion section has an inclination angle of α, and α is an acute angle less than 45°; the outlet contraction section has an inclination angle of β, α>β; and the intermediate catalytic section is a cylindrical structure.

[0033] Preferably, the vortex generator 3 is provided on any one of the inner wall of the inlet expansion section, the inner wall of the middle catalytic section, and the inner wall of the outlet contraction section, that is, it can be provided on any one of the sections, or any two or three sections. After the catalyst carrier assembly is installed in the middle catalytic section of the housing 1, there is still space in front and behind, where the vortex generator 3 can be installed.

[0034] The vortex generator 3 is a combination of one or more structures selected from the group consisting of shark fin, delta wing, triangular prism, triangular pyramid, tetrahedron, cuboid, cube, cylinder and cone. Figure 4 , 5 As shown, in this embodiment, the vortex generator 3 adopts a shark fin structure, and the number is set according to the inlet flow velocity.

[0035] The vortex generators 3 are arranged in any one of the following forms: a circular array, a linear array, or a nonlinear arrangement, and any combination of these forms is acceptable as long as it helps improve the flow conditions. In this embodiment, the shark fin-type vortex generators 3 are arranged in a circular array on the inner wall of the inlet expansion section of the device housing 1, which not only cuts and crushes the low-energy fluid on the inner wall, but also generates small vortices that can inject new energy into the low-energy fluid near the wall, so that its laminar separation is converted into turbulent separation, thereby delaying flow separation, improving the aerodynamic performance of the device, and reducing flow losses by about 2%.

[0036] The catalyst carrier assembly is composed of one or more cylindrical carriers arranged in layers, such as Figure 6 As shown, the cylindrical carrier 5 is a honeycomb beam cavity array porous structure, and the holes are regular hexagons. The diameter of the inscribed circle of the honeycomb holes is set according to the incoming flow aerodynamic conditions and the ozone treatment capacity. The honeycomb structure has strong stability and permeability, and can improve the structural strength of the catalyst carrier. Compared with the wave carrier and the square hole carrier, the "dihedral angles" of the honeycomb beam cavity array porous structure are all obtuse angles. The "dihedral angle" is the corner formed by the intersection of two solid wall surfaces. It is the intersection area of ​​the two solid wall boundary layers. Its distribution law is strongly related to the flow conditions. The intersection of the boundary layers in the corner area can cause flow separation, which is a common problem faced by the external flow and internal flow fields, and is the main cause of the deterioration of the flow in the solid wall intersection area. The present invention adopts a honeycomb beam cavity array porous structure, and all "dihedral angles" are 120°, which can effectively reduce the boundary layer flow resistance in the acute dihedral angle area of ​​the wave carrier, allowing the airflow to pass smoothly and efficiently.

[0037] Catalyst 4 is a mixture of oxides of elements such as manganese, copper, silver, cobalt, platinum, palladium, etc. Silicone resin latex is used as the adhesive of the catalyst 4 coating, which has good permeability and is arranged on the catalyst carrier assembly so that the catalyst 4 is attached to the inner surface of the porous structure of the catalyst carrier assembly, such as Figure 7 After drying, the adhesive can leave a cross-linked polymer network structure, which significantly improves the adhesion of the catalyst 4 coating on the catalyst carrier.

[0038] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An aircraft ozone converter with a built-in vortex generator, characterized in that: It includes a shell, a vortex generator, a catalyst, a catalyst carrier assembly and a wrapping material; The shell has an expanded inlet and contracted outlet structure, and a vortex generator is provided on the inner wall of the expanded inlet section; the catalyst carrier assembly is a porous structure fixed in the middle of the shell, and the catalyst is attached to the inner surface of the porous structure of the catalyst carrier assembly to catalyze a chemical reaction on ozone in the airflow; the outer circumference of the catalyst carrier assembly is coated with the wrapping material.

2. The aircraft ozone converter with built-in vortex generator according to claim 1, characterized in that: The shell is divided into an inlet expansion section, an intermediate catalytic section and an outlet contraction section; The inlet expansion section has an inclination angle of α, which is an acute angle less than 45°; the outlet contraction section has an inclination angle of β, α>β; and the middle catalytic section is a cylindrical structure.

3. The aircraft ozone converter with built-in vortex generator according to claim 2, characterized in that: Any one or more of the inner wall of the inlet expansion section, the inner wall of the middle catalytic section, and the inner wall of the outlet contraction section is provided with a vortex generator.

4. The aircraft ozone converter with built-in vortex generator according to claim 1 or 3, characterized in that: The vortex generator is a combination of one or more structures of a shark fin, a delta wing, a triangular prism, a triangular pyramid, a tetrahedron, a cuboid, a cube, a cylinder, and a cone.

5. The aircraft ozone converter with built-in vortex generator according to claim 1 or 3, characterized in that: The vortex generator is a shark fin structure.

6. The aircraft ozone converter with built-in vortex generator according to claim 4, characterized in that: The vortex generators are arranged in any one or more forms of a circular array, a linear array or a non-linear arrangement.

7. The aircraft ozone converter with built-in vortex generator according to claim 1, characterized in that: The catalyst carrier assembly is composed of more than one cylindrical carrier arranged in layers, and the cylindrical carrier is a honeycomb beam cavity array porous structure, and the holes are regular hexagons.

8. The aircraft ozone converter with built-in vortex generator according to claim 1, characterized in that: The wrapping material is asbestos, glass wool or rock wool.

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