Large-size right-angle rectifier and fluid test system

Abstract

The invention provides a large-size right-angle rectifier and a fluid test system, the large-size right-angle rectifier comprises an inlet section, a rectification cabin and an outlet section, and the inlet section and the outlet section are respectively arranged in two 90-degree directions of the rectification cabin; an inlet is formed in the face, provided with the inlet section, of the rectification cabin. An outlet is formed in the face, provided with the outlet section, of the rectification cabin. The rectification cabin is a shell-shaped cavity, at least two rectification plates are arranged in the rectification cabin, the projection area of a channel formed by the rectification plates at the inlet is consistent with the area of the inlet, and the projection area of the channel formed by the rectification plates at the outlet is consistent with the area of the outlet; according to the device, the functions of airflow turning, pipeline reducing, flow field rectifying and monitoring are considered, the reducing or round pipe and square pipe conversion function can be achieved while airflow turning is conducted, external large and small heads are not needed, meanwhile, the uniformity of an outlet flow field is better, and the functions of multiple devices such as an elbow, a reducing large and small head and a rectifier are integrated; elliptic circumferential weld machining is not needed, the same pressure bearing level can be achieved through a thinner steel plate, and on-site machining and manufacturing are simpler.

Description

Technical Field

[0001] The present invention belongs to the field of manufacturing large-scale test equipment for turbomachines, and particularly relates to a large-size right-angle rectifier and a fluid test system. Background Art

[0002] Existing large-scale wind tunnels or turbomachine test systems face multiple engineering and technical challenges during the design and construction process. First, to meet the large-flow test requirements, which usually reach the order of tens to hundreds of cubic meters per second, the intake pipe system generally adopts a large-bore design with a diameter above DN2000. However, under the limited test site conditions, the pipe routing must achieve spatial turning through multiple groups of elbows, and these elbow assemblies will cause significant air flow separation phenomena. Research shows that when the air flow passes through a 90-degree standard elbow, a double-helix secondary flow structure will be formed in the downstream flow field, and the non-uniformity of the velocity distribution can reach more than 30%. To eliminate this flow distortion, a combined rectifying device of a honeycomb rectifier and a damping screen has to be set downstream of the elbow in engineering. The length of this rectifying section often needs to reach 5-8 times the pipe diameter to ensure that the turbulence intensity at the entrance of the test section is lower than 1%.

[0003] The pipe system design also needs to take into account the differences in the hydrodynamic characteristics of different test equipment. For example, throttle devices such as valves require the pipe cross-sectional area to be controlled within the range of DN800 - DN1200, which can not only reduce the equipment manufacturing cost through a smaller flow area but also achieve precise flow regulation. On the contrary, the turbomachine test bench requires a large cross-sectional area pipe above DN2500 to maintain the inlet flow velocity in the low-speed range of 5-10 m / s, which is not only conducive to the rectifying device to exert its effectiveness but also can avoid the test section noise interference caused by high-speed air flow. This contradictory requirement makes the reducer pipe an essential component of the pipeline system, and its taper design needs to strictly follow the hydrodynamics criterion, usually using a gradual taper angle of 7-15 degrees to avoid flow separation.

[0004] At the construction and implementation level, the transportation and manufacturing problems brought by the super-large pipe diameter are more prominent. Under the constraint of the conventional road transportation width limit of 2.5 meters, elbow assemblies above DN2000 often need to be disassembled for transportation or special vehicles are used. In engineering practice, an alternative solution of on-site rolling and welding "lobster-back bend" is mostly adopted, that is, multiple beveled short pipes are welded into a continuous elbow. However, this method has significant quality hidden dangers: First, the superposition of welding residual stresses brought by multiple circumferential welds is likely to cause stress corrosion cracking when under pressure; second, the non-standard geometric shape leads to aggravated flow field disturbance; third, on-site welding is difficult to achieve precise groove machining and post-weld heat treatment, and the impact toughness value in the weld area is usually lower than that of factory prefabricated parts.

[0005] When the system operates under positive pressure above 0.5 MPa or vacuum condition of -95 kPa, these manufacturing defects will be amplified sharply. Finite element analysis shows that the local stress concentration factor of the miter bend weld with 2 mm offset can reach 3.5 - 4.2 under vacuum negative pressure, far exceeding the allowable stress limit of 1.5 times specified in ASME B16.49 standard. As a result, the leakage accident rate caused by this in actual engineering is as high as 12 - 18%, and major safety accidents such as pipe body instability and collapse have even occurred under extreme working conditions.

[0006] The oversized pipe diameter causes the dimensions of pipe fittings such as elbows and reducers to often exceed the transportation width of 2.5 m of ordinary trucks. Generally, the miter bends are welded on-site, but the unique spatial shape of the elbows makes it difficult to guarantee the quality of on-site welding. This makes it often insufficient in strength under higher pressure or vacuum conditions and prone to causing danger. Summary of the Invention

[0007] In order to solve the problems existing in the prior art, the present invention provides a rectifier that can take into account functions such as fluid turning, pipe diameter change, flow field rectification and monitoring. Compared with the commonly used miter elbows in existing projects, it has higher strength and more uniform outlet flow field, wider engineering applications, and can better simplify the manufacturing process, and is used to solve the problems of fluid turning, diameter change, rectification, etc. in large-diameter pipelines DN2000 and above.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: a large-size right-angle rectifier, including an inlet section, a rectification chamber and an outlet section. The inlet section and the outlet section are respectively arranged in two directions at 90° to the rectification chamber; an inlet is opened on the surface of the rectification chamber where the inlet section is arranged, and an outlet is opened on the surface of the rectification chamber where the outlet section is arranged; the rectification chamber is a shell-shaped cavity, and at least two rectification plates are arranged inside the rectification chamber. The projected area of the channel formed by the rectification plates on the inlet is the same as the inlet area, and the projected area of the channel formed by the rectification plates on the outlet is the same as the outlet area.

[0009] Further, the rectification chamber is a cube or a cuboid formed by connecting six side plates.

[0010] Further, reinforcing plates and reinforcing guide plates are arranged in the rectification chamber. The reinforcing plates and reinforcing guide plates are arranged at the edges perpendicular to the intake air flow direction, and the reinforcing plates and reinforcing guide plates are welded to the inner wall of the side plates.

[0011] Further, reinforcing ribs are arranged on the outer wall surface of the side plates.

[0012] Further, the rectification plates are arc-shaped. One end of the rectification plate is located in the intake port area, the other end of the rectification plate is located in the outlet port area, and the bent edges of the rectification plates are connected to the side plates.

[0013] Further, the cross-section of the inlet section is circular or rectangular, and the cross-section of the outlet section is circular or rectangular.

[0014] Furthermore, there are splitter plates in the inlet section, and the splitter plates are of a central radiation type or a grid type.

[0015] Furthermore, the outlet section is provided with an inverted horn-shaped contraction section and a guiding splitter plate. The guiding splitter plate includes a frame steel plate and columns. A plurality of frame steel plates are connected by columns to form a frame, and a stainless steel skin is arranged on the outside of the frame.

[0016] Furthermore, capillary hollow stainless steel tubes or sensors are arranged in the guiding splitter plate.

[0017] Meanwhile, a fluid test system can also be provided, adopting the above-mentioned large-size right-angle flow straightener.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention takes into account the functions of air flow turning, pipe diameter changing, flow field rectification and monitoring. It can realize the functions of diameter changing or conversion between round pipes and square pipes while the air flow turns, without connecting external reducers. At the same time, the uniformity of the outlet flow field is better, integrating the functions of multiple devices such as elbows, reducers and flow straighteners. The present invention does not need to process elliptical circumferential welds, and can achieve the same pressure-bearing level with thinner steel plates, and the on-site processing and manufacturing are simpler. The present invention is internally provided with splitter plates, enhancing the overall stiffness and being able to bear higher pressure under the same wall thickness. Especially when the internal vacuum degree of the pipe is relatively high, it is not easy to lose stability and collapse.

[0019] Furthermore, the present invention is provided with a maintenance door, which can facilitate entering the interior for maintenance, flaw detection, etc.

[0020] Furthermore, the interior of the guiding splitter plate of the present invention is hollow, and capillary hollow stainless steel tubes, thermocouples or other sensors such as pressure / velocity sensors can be arranged, and the distribution and real-time changes of physical parameters such as cross-section pressure and temperature can be measured in real time, so as to facilitate real-time monitoring of the flow field uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the right-angle flow straightener.

[0022] Figure 2 It is a schematic diagram of the flow straightening cabin.

[0023] Figure 3a It is the circular cross-section inlet section of the inlet section, Figure 3b It is the rectangular cross-section inlet section of the inlet section.

[0024] Figure 4 It is a schematic diagram of the outlet section.

[0025] Figure 5a It is a schematic diagram of the overall guiding splitter plate, Figure 5b It is a schematic diagram of the arcs at both ends of the guiding splitter plate.

[0026] Figure 6a It is a three-dimensional schematic diagram of the connection between the rectifying plate and the guiding rib.

[0027] Figure 6b It is a partial schematic diagram of the connection between the rectifying plate and the guiding rib.

[0028] Figure 6c It is a schematic diagram of the guiding rib structure.

[0029] In the attached drawings, 1 - inlet section; 2 - rectifying cabin; 3 - outlet section; 4 - side plate; 5 - reinforcing plate, 6 - rectifying plate, 7 - reinforced guiding plate, 8 - inspection door, 10 - outer intake pipe, 11 - support plate, 12 - inner support plate, 13 - inverted horn-shaped contraction section, 14 - outer exhaust pipe, 15 - guiding support plate. Specific embodiments

[0030] To make the technical solutions and beneficial effects involved in this application clearer, the following will, in combination with the attached drawings in the description of the drawings of this application, provide a more detailed explanation of the technical solutions involved in this application. The specific embodiments described in this application are only some embodiments of this application, rather than all embodiments. The explanations with reference to the attached drawings are exemplary in nature, aiming to explain this application and should not be construed as a limitation to this application. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The following will provide a detailed description of the embodiments of this application with reference to the attached drawings.

[0031] Reference Figure 1, a large-sized right-angle rectifier provided by the present invention includes an inlet section 1, a rectification chamber 2, and an outlet section 3. Since there is no direct contact between the cross-sections of the inlet section 1 and the outlet section 3, it is possible to achieve a variable cross-section function including diameter variation or transformation from a circular pipe to a square pipe while the airflow turns; the inlet section 1 and the outlet section 3 are respectively arranged in two directions of 90° of the rectification chamber 2; an inlet is opened on the surface of the rectification chamber 2 where the inlet section 1 is arranged, and an outlet is opened on the surface of the rectification chamber 2 where the outlet section 3 is arranged; the rectification chamber 2 is a shell-shaped cavity, and at least two rectification plates 6 are arranged inside the rectification chamber 2. The projected area of the channel formed by the rectification plates 6 on the inlet is the same as the inlet area, and the projected area of the channel formed by the rectification plates 6 on the outlet is the same as the outlet area; a plurality of inlet flow guiding plates 16 are arranged on the airflow path from the inlet to the rectification plates 6, and a plurality of outlet flow guiding plates 17 are arranged on the airflow path from the rectification plates 6 to the outlet. The right-angle structure optimization and the rectification plates cooperate to reduce turbulence and pressure drop. Traditional right-angle turning easily causes fluid separation and eddy currents, resulting in energy loss. The rectification chamber guides the fluid in stages through the internal rectification plates, enabling the flow direction to transition smoothly from the inlet to the outlet (90° turn), reducing local resistance, thereby reducing pressure drop and turbulence intensity. At least two rectification plates gradually adjust the fluid direction, avoiding a single violent turn, optimizing the flow path, and enhancing stability. The projected areas of the channels formed by the rectification plates at the inlet and the outlet are the same as the corresponding openings, conforming to the principle of fluid mechanics continuity, avoiding sudden changes in flow velocity caused by sudden changes in cross-sectional area, thereby suppressing turbulence and pressure fluctuations. The stable flow velocity distribution reduces kinetic energy loss, especially suitable for high-flow velocity or large-flow scenarios, and improves the overall energy efficiency.

[0032] The shell-shaped cavity design is convenient for integration into complex pipeline systems and supports adjusting the number and layout of rectification plates according to requirements to adapt to different fluid characteristics and working conditions. Optimized for large-sized fluid transportation scenarios, it solves the problem of flow control caused by increased size in traditional solutions, reduces the driving energy consumption directly by reducing the pressure drop, is applicable to high-energy consumption fields such as chemical engineering and energy transportation, and the smooth flow reduces vibration and noise, improving the operation reliability of equipment and environmental comfort.

[0033] As a preferred embodiment, the rectification chamber 2 is a cube.

[0034] The rectification chamber 2 includes side plates 4, reinforcement plates 5, rectification plates 6, reinforcement flow guiding plates 7, inspection doors 8, flow guiding ribs 9, inlet flow guiding plates 16, and outlet flow guiding plates 17. The overall outer frame is formed by connecting six side plates 4. The six side plates 4 are connected to form a cubic space, and the rectification plates 6 are arranged in the cubic space. Multiple rectification plates 6 are arranged. An inlet is opened on the surface of the rectification chamber 2 where the inlet section 1 is arranged, and an outlet is opened on the surface of the rectification chamber 2 where the outlet section 3 is arranged. The inlet and the outlet are rectangular or circular. The rectification plates 6 are arc-shaped, and the two curved sides of the rectification plates are fixedly connected to the side plates 4.

[0035] The invention provides a method for manufacturing a large-size right-angle rectifier, which specifically includes the following steps: six side panels 4 are welded to form a cube. Of course, if space is limited, they can also be welded to form a cuboid, which does not affect the basic function of the rectifier cabin 2. The two side panels 4 have holes connected to the inlet section and the outlet section respectively. Generally, round holes are opened, and square holes or holes of other shapes can also be opened according to engineering needs. For high-pressure working conditions, the corresponding openings can be reinforced. At the same time, reinforcing ribs can also be added to the outer wall of the side panel to improve the overall rigidity.

[0036] The reinforcing plates 5 are located at several edges of the rectifier cabin 2 and are connected to the side plates 4 by welding, which not only increases the overall rigidity of the rectifier cabin 2, but also reduces the erosion of the airflow on the welds of the side plates 4 when the fluid contains more impurities, thereby increasing the service life of the entire right-angle rectifier.

[0037] The rectifier plate 6 is arc-shaped and is formed by bending with a plate bending machine. The rectifier plate 6 is fastened to the upper and lower side plates 4 by welding or other means, which improves the overall rigidity of the rectifier cabin 2. Figure 6a , Figure 6b and Figure 6c When welding connection is selected, multiple lugs are cut at the upper and lower ends of the rectifier plate 6. The lugs are generally located at the air inlet end, the middle section, and the exhaust end of the rectifier plate 6. Holes corresponding to the shape of the lugs are dug out on the side plate 4. The lugs are connected to the side plate 4 by external insertion. In this way, the rectifier plate 6 is externally inserted as a whole, which not only reduces the welding workload and post-welding stress deformation, but also facilitates the positioning of the rectifier plate 6. The arc shape makes it difficult for the rectifier plate 6 to become unstable when the rectifier cabin 2 is subjected to external pressure, and the arc shape of the rectifier plate 6 also has a flow-guiding function, and the arc spacing is designed for equal flow. When the inlet and outlet of the rectifier cabin 2 are both rectangular, the arc shape can be simplified to a 90-degree arc and arranged at equal intervals. When the inlet and outlet of the rectifier cabin 2 are other shapes such as a circle, the rectifier plate 6 should be able to ensure that the projected areas of the channel entrances formed between the two farthest rectifier plates 6 on the inlet opening surface of the side plate 4 are roughly equal, and at the same time, the projected areas of the channel outlets on the outlet opening surface of the side plate 4 are roughly equal. Of course, the use of an arc shape is also convenient for on-site processing with a plate bending machine. When necessary, other shapes can also be used. As an example, a hyperbolic shape can be used, which can better reduce airflow separation and make the downstream flow field more stable.

[0038] refer to Figure 1 and Figure 2 The inlet guide plate 16 is cut from a steel plate and is fastened to the upper and lower side plates 4 by welding or other means to guide the flow upstream of the rectifying plate 6, so that more air flows through the rectifying plate 6 instead of flowing to the outlet along the wall. The multiple inlet guide plates 16 are parallel to each other and the front ends are aligned in a straight line. The closer the inlet guide plate 16 is to the side plate 4, the longer it is.

[0039] The outlet flow guiding plate 17 is cut from a steel plate and fixedly connected to the upper and lower side plates 4 by welding or other means, for guiding the flow upstream of the outlet section 3 to improve the inlet flow field quality of the outlet section 3. Multiple outlet flow guiding plates 17 are parallel to each other and their ends are aligned on a straight line. The outlet flow guiding plate 17 closer to the side plate 4 is longer. The front end of the outlet flow guiding plate 17 closest to the side plate 4 is bent into a horn shape, and the bent edge is connected to the side plate 4, which is convenient for guiding a larger range of fluids.

[0040] The strengthening flow guiding plate 7 is arc-shaped and formed by rolling with a bending machine. The strengthening flow guiding plate 7 is located at the connection of the two side plates 4 without openings. It not only has the same function as the strengthening plate 5, but also the arc-shaped shape of the strengthening flow guiding plate 7 can better assist in guiding the flow.

[0041] The maintenance door 8 is used to facilitate personnel to enter the fairing for operation. Generally, the opening is designed as a rounded rectangle for easy access. Considering the processing technology, when the pressure difference between the inside and outside of the fairing is large, the maintenance door can also be designed as a circle. When considering economy, it can also be simplified by using a large flange blind plate. The maintenance door 8 is opened on the direction or surface of the fairing 2 without functional structures.

[0042] Reference Figure 2 , a plurality of flow guiding ribs 9 are arranged in the air flow channel formed by the flow rectifying plate 6 and the side plate. The flow guiding ribs 9 are cut from sheet metal, reference Figure 6a , Figure 6b and Figure 6c , the flow guiding ribs 9 are arranged staggeredly. The flow rectifying plate 6 and the flow guiding ribs 9 are connected into a whole by opening holes in the flow rectifying plate 6, inserting the flow guiding ribs 9, and then welding. The two ends of the flow guiding ribs 9 are rounded. In this way, the stress concentration can be avoided to a certain extent by the holes in the flow rectifying plate 6; at the same time, setting the flow guiding ribs 9 helps to improve the overall strength of the flow rectifying plate 6; the staggered layout of the flow guiding ribs forms an asymmetric flow channel, which can effectively decompose large-scale eddy structures, generate controllable secondary flow when the air flow passes through the flow rectifying plate, reduce the turbulent kinetic energy loss, reduce the turbulence intensity, the staggered flow guiding ribs force the air flow to flow in layers, avoid local flow velocity being too fast or too slow, and achieve uniform distribution of the flow field. The orderly guidance of the flow guiding ribs reduces the air flow separation. The staggered arrangement can utilize the air flow inertia, and convert part of the transverse kinetic energy into directional kinetic energy through the inclination angle of the flow guiding ribs to improve the flow efficiency. In addition, as a reinforcing rib, the flow guiding rib can improve the structural rigidity of the flow rectifying plate and the side plate, and resist the deformation or vibration caused by the impact of high-speed air flow.

[0043] As a further optimization, the leading edge of the flow guiding rib 9 is shaped with a streamline.

[0044] The inlet section 1 has two specifications of circular cross-section and square cross-section. The inlet section 1 with a circular cross-section includes an intake outer pipe 10, a support plate 11, and an inner support pipe 12. Among them, the inner support pipe 12 should preferably be a seamless steel pipe with a large wall thickness. The support plates 11 are radially and evenly distributed circumferentially and are welded to the intake outer pipe 10 and the inner support pipe 12. In the inlet section 1 with a square cross-section, the support plates 11 are arranged in a grid pattern, and the inner support pipe 12 is omitted. Refer to Figure 3a and Figure 3b .

[0045] The outlet section 3 includes an inverted trumpet-shaped contraction section 13, an exhaust outer pipe 14, and a guiding support plate 15. Among them, the inverted trumpet-shaped contraction section 13 extends deep into the fairing 2 to optimize the uniformity of the oncoming flow. The exhaust outer pipe 14 is connected to the fairing 2 by welding. The exhaust outer pipe 14 can also be connected to the fairing 2 by means of spigot positioning and bolt fastening to improve the overall positional accuracy and reduce the deformation of thin-walled parts caused by welding. Both ends of the guiding support plate 15 are arc-shaped. The larger the included angle θ between the two side faces, the thicker the guiding support plate 15, and the higher the overall stiffness of the outlet section 3. However, an excessive included angle θ means higher manufacturing costs and a larger blockage area. Therefore, the included angle θ is controlled between 8° and 15° to facilitate the guiding of the airflow and reduce the separation of the downstream airflow boundary layer. Refer to Figure 4 .

[0046] The guiding support plate of the present invention is hollow inside, and capillary hollow stainless steel pipes, thermocouples, or other sensors such as pressure / velocity sensors can be arranged inside it, so as to measure the distribution and real-time changes of physical parameters such as cross-sectional pressure and temperature in real time, thereby facilitating the real-time monitoring of the flow field uniformity.

[0047] Refer to Figure 5a and Figure 5b, meanwhile, the guiding splitter plate 15 can be fabricated using a framework-skin process similar to that of an aircraft wing. First, a framework steel plate 22 with the same cross-sectional shape as the guiding splitter plate is fabricated, and then the framework steel plates 22 are welded together by columns 20 to form a unified framework. A stainless-steel skin 21 with a thickness of generally 0.5 mm is then covered on the outside. The stainless-steel skin 21 is fixed to the framework steel plate 22 by riveting or other means. This can greatly reduce the weight of the guiding splitter plate 15 and maintain a good aerodynamic shape; adopting a thin-wall stiffening design, the cross-sectional moment of inertia is higher than that of traditional structures; the cavity structure provides a strain buffer space and can withstand vibration loads with a certain amplitude without plastic deformation; the continuous smooth surface shortens the boundary layer transition length, increases the critical angle of attack. The internally hollow guiding splitter plate 15 can also be internally provided with capillary hollow stainless-steel tubes 23 with an outer diameter of about 1 mm, which are used to connect the upstream flow of the guiding splitter plate 15 to an external pressure sensor, and then the pressure distribution of the flow in the outlet section 3 is measured through the external pressure sensor, so as to monitor the flow field uniformity in real time. The capillary hollow stainless-steel tubes 23 can also be replaced by thermocouples or other pressure / velocity sensors, etc., for monitoring the temperature distribution and real-time changes of other physical parameters of the incoming flow. Additionally, as a possible optimization, a gradient composite skin is used in the leading-edge area to further reduce weight.

[0048] If the cross-section of the outlet section 3 is circular, the guiding splitter plate 15 can be arranged in a radial pattern similar to that of the circular cross-section inlet section. If the cross-section of the outlet section 3 is rectangular, the guiding splitter plate 15 can be arranged in a grid pattern similar to that of the rectangular cross-section inlet section. Of course, other arrangement methods can also be selected in combination with CFD simulation calculations to achieve a better rectification effect.

[0049] The present invention provides a design method for a large-size right-angle rectifier, which is formed by bending and welding sheet metal, with simple processing, and combines functions such as airflow turning, pipe diameter change, flow field rectification, and monitoring.

[0050] The right-angle rectifier is internally provided with a reinforcing plate, a rectifying plate, a reinforcing deflector plate, an inlet flow deflector plate, and an outlet flow deflector plate, which optimize the outlet flow field and improve the overall stiffness; The inlet section is internally provided with splitter plates, which improve the flow field uniformity and overall stiffness; The outlet section is provided with an inverted trumpet-shaped contraction section and guiding splitter plates, which improve the flow field uniformity and overall stiffness; The guiding splitter plates in the outlet section adopt a skin-framework process and are internally provided with capillary hollow stainless-steel tubes to measure pressure and thermocouples to measure temperature, and the cross-sectional pressure distribution can be measured in real time while rectifying; the rectifying cabin is provided with a maintenance door, which facilitates entry for internal maintenance and flaw detection.

[0051] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A large-sized right-angle rectifier, characterized in that, It includes an inlet section (1), a fairing (2) and an outlet section (3). The inlet section (1) and the outlet section (3) are respectively arranged in two directions at 90° of the fairing (2). An inlet is opened on the surface of the fairing (2) where the inlet section (1) is arranged, and an outlet is opened on the surface of the fairing (2) where the outlet section (3) is arranged. The fairing (2) is a shell-shaped cavity, and at least two fairing plates (6) are arranged inside the fairing (2). The projected area of the channel formed by the fairing plates (6) at the inlet is the same as the inlet area, and the projected area of the channel formed by the fairing plates (6) at the outlet is the same as the outlet area. A plurality of inlet flow guiding plates (16) are arranged on the air flow path from the inlet to the fairing plates (6), and a plurality of outlet flow guiding plates (17) are arranged on the air flow path from the fairing plates (6) to the outlet.

2. The large-sized right-angle rectifier according to claim 1, wherein The fairing (2) is a cube or a cuboid, formed by connecting six side plates (4), and reinforcing ribs are arranged on the outer wall surface of the side plates (4).

3. The large-size right-angle rectifier according to claim 2, characterized in that, Reinforcing plates (5) and reinforcing flow guiding plates (7) are arranged in the fairing (2). The reinforcing plates (5) and the reinforcing flow guiding plates (7) are arranged at the edges perpendicular to the intake air flow direction, and the reinforcing plates (5) and the reinforcing flow guiding plates (7) are welded to the inner wall of the side plates (4).

4. The large-sized right-angle rectifier according to claim 2, wherein The inlet flow guiding plates (16) and the outlet flow guiding plates (17) are arranged at the outer arc of the elbow. The inlet flow guiding plates (16) are connected to the inner wall of the side plates. There is a gas flow channel between two adjacent inlet flow guiding plates (16). A plurality of inlet flow guiding plates (16) are parallel to each other and their fronts are aligned on a straight line. The inlet flow guiding plate (16) closer to the side plate (4) is longer. A plurality of outlet flow guiding plates (17) are parallel to each other and their ends are aligned on a straight line. The outlet flow guiding plate (17) closer to the side plate (4) is longer. The front end of the outlet flow guiding plate (17) closest to the side plate (4) is bent into a trumpet shape, and the bent edge is connected to the side plate (4). The inlet flow guiding plates (16) and the other outlet flow guiding plates (17) are flat plates.

5. The large-sized right-angle rectifier according to claim 2, wherein The fairing plates (6) are arc-shaped. One end of the fairing plates (6) is located in the intake port area, and the other end of the fairing plates (6) is located in the outlet port area. The bent edges of the fairing plates (6) are connected to the side plates (4). A plurality of flow guiding ribs (9) are arranged in the air flow channel formed by the fairing plates (6) and the side plates. The leading edge of the flow guiding ribs (9) is shaped by streamline modification.

6. The large-size right-angle rectifier according to claim 1, characterized in that The cross-section of the inlet section (1) is circular or rectangular, and the cross-section of the outlet section (3) is circular or rectangular.

7. The large-size right-angle rectifier according to claim 6, wherein, There are support plates arranged in the inlet section (1), and the support plates are of a central radiation type or a grid type.

8. The large-size right-angle rectifier according to claim 1, characterized in that, The outlet section (3) is provided with an inverted trumpet-shaped contraction section (13) and a guiding support plate (15). The guiding support plate (15) includes a frame steel plate (22) and columns (20). A plurality of frame steel plates (22) are connected by the columns (20) to form a frame, and a stainless steel skin (21) is arranged on the outside of the frame.

9. The large-sized right-angle rectifier according to claim 1, wherein, Capillary hollow stainless steel tubes or sensors are arranged in the guiding support plate (15).

10. A fluid test system, characterized in that, Adopt the large-size right-angle rectifier according to any one of claims 1-9.

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