Multi-scale adaptive flat oxygen injection rake

Abstract

The utility model provides a multi-scale adaptive flat oxygen injection harrow, which can cover the width of the section of the whole flow channel without changing the structure of the existing closed-loop fluid equipment and achieve uniform oxygen injection, and the front end of the injection harrow comprises an injection harrow front section, a closed-loop fluid system butting flange and an injection harrow rear section which are connected in sequence, the injection rake rear section is connected with the injection rake front section after penetrating through the closed-loop fluid system butt flange, and an internal air duct of the injection rake front section is communicated with an internal air duct of the injection rake rear section; the rear section of the injection rake is a flat plate body with a playground-shaped section, and a plurality of exhaust holes which are distributed in a linear array are formed in two arc-shaped edges of the rear section of the injection rake.

Description

A multi-scale adaptable flat oxygen injection rake Technical Field

[0001] This utility model relates to the field of aircraft experimentation, and more specifically, to a multi-scale adaptable flat oxygen injection rake. Background Technology

[0002] In closed-loop fluid system experiments, increasing the Reynolds number can better simulate real flight conditions and reduce experimental errors. The cryogenic properties of liquid nitrogen significantly lower the gas temperature within the closed-loop fluid system, thereby increasing the gas density and consequently the experimental Reynolds number. Simultaneously, the vaporization of liquid nitrogen absorbs heat and transforms into nitrogen gas, which can accurately simulate the operating environment of an aircraft. To meet the experimental requirements for the oxygen content in the incoming airflow and to precisely control the oxygen concentration, it is necessary to uniformly inject oxygen into the closed-loop fluid system.

[0003] However, traditional closed-loop fluid system airflow injection devices have the following problems:

[0004] 1. Insufficient uniformity: The use of single-point injection or fixed-length injection rakes leads to local oxygen enrichment / deficiency in the flow field (concentration difference > ±5%).

[0005] 2. Poor structural compatibility: The rigid design cannot adapt to different closed-loop fluid system cross-sections (2-4 meters wide), requiring customized modification of the tunnel structure;

[0006] 3. Significant pressure drop: Abrupt changes in the cross-sectional area of ​​the flow channel (e.g., DN80→DN50) result in a pressure drop >10kPa, affecting system stability;

[0007] 4. Installation limitations: Fixed flange interfaces are difficult to adapt to on-site space conditions, and welding modifications damage the insulation layer. Summary of the Invention

[0008] The purpose of this invention is to provide a multi-scale adaptable flat oxygen injection rake that can cover the entire cross-sectional width of the flow channel without changing the structure of the existing closed-loop fluid equipment, thus achieving uniform injection.

[0009] The embodiments of this utility model are implemented as follows:

[0010] A multi-scale adaptable flat oxygen injection rake, the front end of which includes an injection rake front section, a closed-loop fluid system docking flange, and an injection rake rear section connected in sequence.

[0011] The rear section of the injection rake passes through the flange of the closed-loop fluid system and connects to the front section of the injection rake. The internal air ducts of the front and rear sections of the injection rake are interconnected. The rear section of the injection rake is a flat plate with a cross-section shaped like a playground. Multiple exhaust holes are arranged in a linear array on the two arc-shaped sides of the rear section of the injection rake.

[0012] In a preferred embodiment of the present invention, the aforementioned closed-loop fluid system docking flange is a flat block with a cross-section resembling a playground. The center of the closed-loop fluid system docking flange is provided with a playground-shaped through hole for the rear section of the injection rake to enter. A row of flange connection holes is provided above and below the playground-shaped through hole.

[0013] In a preferred embodiment of the present invention, the aforementioned injection rake front section is composed of a cylindrical pipe section and a platform pipe section, with a curved transition at the connection between the cylindrical pipe section and the platform pipe section, and the upper bottom of the platform pipe section being circular and connected to the circular pipe section.

[0014] In a preferred embodiment of the present invention, the lower bottom of the above-mentioned platform-shaped pipe segment is "playground-shaped", and the width of the lower bottom of the platform-shaped pipe segment is the same as the diameter of the upper bottom of the platform-shaped pipe segment, and the upper bottom and lower bottom of the platform-shaped pipe segment share a common centerline.

[0015] In a preferred embodiment of this utility model, the fluid cross-sectional area of ​​the internal air duct is equal to the cross-sectional area of ​​the DN65 or DN80 pipe.

[0016] In a preferred embodiment of the present invention, the above-mentioned injection rake further includes an air inlet pipe, which is connected to the air inlet end of the front section of the injection rake, and the air inlet pipe is cylindrical.

[0017] In a preferred embodiment of the present invention, the above-mentioned spray rake further includes: an air supply pipe connecting flange, which is connected to the air inlet end of the air inlet pipe.

[0018] In a preferred embodiment of this utility model, the front end and rear end of the injection rake are symmetrically arranged with the rear section of the injection rake as the line of symmetry.

[0019] In a preferred embodiment of this utility model, the overall height of the multi-scale adaptable flat oxygen injection rake is 2.4 to 4 meters.

[0020] In a preferred embodiment of the present invention, the above-mentioned platform-shaped pipe section is provided with a through hole with a cross-section in the shape of a playground, and a sealing groove matching the shape of the "playground-shaped" through hole is provided on the outer edge of the "playground-shaped" through hole.

[0021] The beneficial effects of this utility model embodiment are:

[0022] The multi-scale adaptable flat oxygen injection rake of this invention adopts a wide range of adaptability, covering more than 90% of the flow channel cross-section of the closed-loop fluid system from 2.4 to 4 meters. It is designed according to the principle of not changing the cave structure of the closed-loop fluid system and not damaging the existing cave wall and insulation structure. The front section of the injection rake is designed as a cylinder. After the flow channel cross-section is transformed from a circle to a flat "playground shape" through a type of pipe section, the flow channel design with DN65 / DN80 and other cross-sections is used. It operates with low pressure loss, reducing the pressure drop by 80% (≤2kPa) and reducing the pressure drop of the airflow. Then, the exhaust hole of the flat "playground shape" injection rake at the rear section discharges the gas, covering the entire width of the flow channel cross-section for uniform injection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the multi-scale adaptable flat oxygen injection rake structure of an embodiment of the present invention.

[0025] Figure 2 is a structural schematic diagram of the front section of the injection rake in an embodiment of this utility model;

[0026] Icons: Air supply pipe connecting flange 110; Air inlet pipe 120; Injection rake front section 130; Cylindrical pipe section 131; Terraced pipe section 132; Through hole 133; Sealing groove 134; Locating pin hole 135; Threaded hole 136; Closed-loop fluid system connecting flange 140; "playground-shaped" through hole 141; Flange connection hole 142; Injection rake rear section 150; Exhaust hole 151. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] First Embodiment

[0034] Please refer to Figure 1. This embodiment provides a multi-scale adaptable flat oxygen injection rake for use in closed-loop fluid system simulation experiments. An oxygen injection system is installed downstream of the test section to inject dry air or oxygen. The multi-scale adaptable flat oxygen injection rake is the tail end device for injecting dry air or oxygen.

[0035] The front end of the injection rake includes a supply pipe flange 110, an inlet pipe 120, an injection rake front section 130, a closed-loop fluid system flange 140, and an injection rake rear section 150 connected in sequence. The injection rake rear section 150 passes through the center of the closed-loop fluid system flange 140 and connects to the injection rake front section 130. The internal air ducts of the injection rake front section 130 and the injection rake rear section 150 are interconnected. The injection rake rear section 150 is a flat plate with a "playground-shaped" cross-section. Multiple exhaust holes 151 are arranged in a linear array on the two arc-shaped sides of the injection rake rear section 150. Dry air or oxygen enters from the injection rake front section 130, passes through the internal air duct, and is output to the exhaust holes 151 of the injection rake rear section 150 for uniform discharge.

[0036] Oxygen injection can be achieved using the drying system and its associated dry air storage tank, or by using an additional gas source provided by Party B to meet the technical requirements. The gas in the injection equipment circuit can be oxygen, dry air, or a mixture of dry air and oxygen.

[0037] Specifically, the injection rake section 130 consists of a cylindrical pipe section 131 and a platform-shaped pipe section 132. The connection between the cylindrical pipe section 131 and the platform-shaped pipe section 132 is a curved transition. The upper bottom of the platform-shaped pipe section 132 is circular and connects to the cylindrical pipe section 131. The lower bottom of the platform-shaped pipe section 132 is a flat plate with a "playground-shaped" cross-section, and the width of the lower bottom of the platform-shaped pipe section 132 is the same as the diameter of the upper bottom. The upper and lower bottoms of the platform-shaped pipe section 132 share a common centerline, allowing the airflow entering from the cylindrical pipe section 131 to smoothly enter the platform-shaped pipe section 132 and then exit from both sides of the platform-shaped pipe section 132.

[0038] Please refer to Figure 2. Since the cross-sectional shape of the injection rake section 150 is "playground-shaped," one end face of the corresponding platform-shaped pipe section 132 is also provided with a through hole 133 with a cross-sectional shape of "playground." The outer edge of the "playground-shaped" through hole 133 is provided with a sealing groove 134 that matches the shape of the "playground-shaped" through hole, which is used to assemble a sealing gasket with a matching shape to ensure the sealing effect. The internal cross-sectional shape of the through hole 133 smoothly transitions from the "playground-shaped" shape of the end face to a circle that matches the shape of the cylindrical pipe section 131.

[0039] The sealing groove 134 has a locating pin hole 135 in the middle of the two arc-shaped sides, and threaded holes 136 for connecting the closed-loop fluid system docking flange 140 on the two straight sides.

[0040] The shape of the internal air duct can be designed to follow the overall structure of the injection rake front section 130 or injection rake rear section 150, but the internal fluid cross-sectional area must be equal to the cross-sectional area of ​​the DN65 or DN80 pipe to reduce pressure drop.

[0041] The closed-loop fluid system docking flange 140 is a flat block with a cross-section resembling a playground. The center of the closed-loop fluid system docking flange 140 is provided with a playground-shaped through hole 141 for the injection rake section 150 to enter. A row of flange connection holes 142 is provided above and below the playground-shaped through hole 141 to facilitate the assembly of equipment interfaces.

[0042] The air inlet pipe 120 is connected to the air inlet end of the injection rake front section 130. The air inlet pipe 120 is cylindrical. The air supply pipe connecting flange 110 is used to connect the equipment and the air inlet pipe 120. It is connected to the air inlet end of the air inlet pipe 120 and is used to converge multiple pipelines to the air inlet of the new injection rake.

[0043] The front and rear ends of the injection rake are symmetrically arranged with the rear section of the injection rake at 150 as the symmetry line. The overall height of the multi-scale adaptable flat oxygen injection rake is 2.4 to 4 meters. Multiple oxygen injection rakes can be arranged in a fence-like manner in the closed-loop fluid system, covering the entire width of the flow channel of the closed-loop fluid system.

[0044] The multi-scale adaptable flat oxygen injection rake of this utility model is designed according to the principle of not changing the structure of the closed-loop fluid system cave and not damaging the existing cave wall and insulation structure. The front section 130 of the injection rake is designed as a cylinder. After the flow channel cross section is transformed from a circle to a flat "playground shape" through a type pipe section 132, the pressure drop of the airflow is minimized. Then, the flat "playground shape" injection rake rear section 150 discharges through the exhaust hole 151, covering the entire cross section width of the flow channel for uniform injection.

[0045] This specification describes examples of embodiments of the present invention, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings are not necessarily drawn to scale; some features may be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to implement the present invention in various forms. Those skilled in the art will understand that multiple features illustrated and described with reference to any of the drawings can be combined with features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The illustrated combinations of features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used as needed for specific applications or implementations.

[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-scale adaptable flat oxygen injection rake, characterized in that, The oxygen injection rake front end includes an injection rake front section, a closed-loop fluid system docking flange, and an injection rake rear section connected in sequence. The injection rake rear section passes through the closed-loop fluid system docking flange and connects to the injection rake front section. The internal air ducts of the injection rake front section and the injection rake rear section are interconnected. The injection rake rear section is a flat plate with a cross-section shaped like a playground. Multiple exhaust holes are arranged in a linear array on the two arc-shaped sides of the injection rake rear section.

2. The multi-scale adaptable flat oxygen injection rake according to claim 1, characterized in that, The closed-loop fluid system docking flange is a flat block with a cross-section shaped like a playground. The center of the closed-loop fluid system docking flange is provided with a playground-shaped through hole for the rear section of the injection rake to enter. A row of flange connection holes is provided above and below the playground-shaped through hole.

3. The multi-scale adaptable flat oxygen injection rake according to claim 2, characterized in that, The front section of the injection rake consists of a cylindrical pipe section and a platform pipe section. The connection between the cylindrical pipe section and the platform pipe section is a curved transition. The upper base of the platform pipe section is circular and connects to the circular pipe section.

4. The multi-scale adaptable flat oxygen injection rake according to claim 3, characterized in that, The bottom of the pedigree tube segment is "playground-shaped", and the width of the bottom of the pedigree tube segment is the same as the diameter of the top of the pedigree tube segment. The top and bottom of the pedigree tube segment share a common centerline.

5. The multi-scale adaptable flat oxygen injection rake according to claim 1, characterized in that, The cross-sectional area of ​​the internal air duct is equal to the cross-sectional area of ​​the input pipe.

6. The multi-scale adaptable flat oxygen injection rake according to claim 1, characterized in that, The injection rake further includes an air inlet pipe, which is connected to the air inlet end of the front section of the injection rake, and the air inlet pipe is cylindrical.

7. The multi-scale adaptable flat oxygen injection rake according to claim 6, characterized in that, The spray rake also includes an air supply pipe connecting flange, which is connected to the air inlet end of the air inlet pipe.

8. The multi-scale adaptable flat oxygen injection rake according to claim 1, characterized in that, The front and rear ends of the injection rake are symmetrically arranged with the rear section of the injection rake as the line of symmetry.

9. The multi-scale adaptable flat oxygen injection rake according to claim 1, characterized in that, The overall height of the multi-scale adaptable flat oxygen injection rake is 2.4 to 4 meters.

10. The multi-scale adaptable flat oxygen injection rake according to claim 4, characterized in that, The platform-shaped pipe section is provided with a through hole with a cross-section shaped like a playground, and the outer edge of the "playground-shaped" through hole is provided with a sealing groove that matches the shape of the "playground-shaped" through hole.

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