CN115931368B - Flow field uniformity device for improving air intake quality and self-adapting use environment - Google Patents
Flow field uniformity device for improving air intake quality and self-adapting use environment Download PDFInfo
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- CN115931368B CN115931368B CN202310218551.4A CN202310218551A CN115931368B CN 115931368 B CN115931368 B CN 115931368B CN 202310218551 A CN202310218551 A CN 202310218551A CN 115931368 B CN115931368 B CN 115931368B
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Abstract
The application provides a flow field uniformity device for improving air intake quality and self-adapting use environment, which comprises a fine rectifier and a coarse rectifier, wherein the fine rectifier and the coarse rectifier comprise a plurality of rectifying modules, each rectifying module comprises a plurality of criss-cross longitudinal grid thin plates and transverse grid thin plates, one side of each grid thin plate is provided with a plurality of arranged mounting seams, the other side of each grid thin plate is provided with a plurality of arranged expansion seams, the longitudinal grid thin plates and the transverse grid thin plates are connected with each other through the mounting seams in an inserting manner, the expansion seams enable the single grid thin plates to absorb deformation caused by environmental change, and the situation that the grid thin plates are deformed in an uncoordinated manner so as to tear the joints of the grid plates is avoided; the rectifier unit is installed in the casing of the air inlet front chamber through the installation frame, the installation frame is not welded with the casing in a contact way, the deformation of the installation frame is absorbed, the limit baffle ring is installed behind the installation frame, and the phenomenon that the welding seam of the installation frame and the air inlet front chamber is torn due to deformation and airflow excitation is eliminated.
Description
Technical Field
The application relates to the field of aeroengine high-altitude simulation test equipment, in particular to a flow field uniformity device for improving air intake quality and self-adapting use environment.
Background
The high-altitude simulation test is an important means for carrying out the performance and functional technology verification and assessment of the aero-engine, the quality of air intake has great influence on performance indexes such as measuring the air flow of an engine inlet, evaluating the fuel consumption rate and thrust of the engine, and the like, and the requirements of the quality of the flow field of the engine inlet of the high-altitude simulation test are as follows according to the regulations of GJB 4879: the non-uniformity and the turbulence degree of the pressure field and the temperature field are not more than +/-1.0 percent. In order to meet the requirement of air intake conditions of test tasks of a vortex-jet-vortex fan engine high-altitude simulation test, the design temperature range of an air intake front chamber is generally 75 ℃ to 250 ℃, the design pressure range is generally 2.5kPa to 300kPa, under the working environment, the flow field uniformity device not only plays a role in improving the quality of an air intake flow field, but also has to adapt to structural deformation caused by temperature and pressure change in the use environment, especially, the air intake flow rate is greatly increased along with the improvement of the development level of the engine during the test, and the inner diameter of the air intake front chamber and the structural size of the flow field uniformity device are also increased along with the improvement, so that the structural rigidity and the operation stability of the flow field uniformity device can be ensured under the large-environment temperature difference.
In order to meet the requirement of the quality of an air inlet flow field of an engine test, the air inlet flow field uniformity device of high-altitude simulation test equipment used in China at present adopts two specifications of thick and thin for rectifying and equalizing flow and breaking flow, the thin specification is in front, and the thick specification is in back for weakening shear flow in airflow wake after flowing through the thin flow field uniformity device; the flow field uniformity device of the two specifications is formed by intersecting and splicing grid thin plates made of stainless steel, the grid thin plates are installed in the frame in a blocking manner, the splicing positions of the grid thin plates are connected in a full-welded mode, and the grid blocks in a single installation space are connected with the frame and the front chamber shell in a full-welded mode, so that when an air inlet is at a negative temperature and is influenced by air inlet impact in a high-altitude simulation test, the grid thin plates and the installation frame are shrunk and deformed, shrinkage and deformation amounts of the same section at different positions from the center are inconsistent, and an uncoordinated stretching effect is generated at a connecting weld joint; similarly, when the air inlet temperature is high, the joint weld joint can be compressed due to uncoordinated deformation, so that repeated alternating circulation of working states between the high temperature and the negative temperature greatly influences the service life of welding, and the flow field uniform device is torn from the weak welding position, so that the normal development of test tasks is influenced, and the safety of the test process is also influenced.
In order to solve the problem of tearing of the flow field uniformity device, full welding at the cross splicing position of the grid thin plates is changed into intermittent welding, so that the improvement can only temporarily solve the use difficulty in the development period of test tasks, the weak position of the device is inspected after the test is finished, and repair welding is carried out on the position where the crack appears, and the problem cannot be fundamentally solved in the practical use facing to the long-term operation of the blowout type growing test tasks and equipment, and the safety of the test operation cannot be ensured.
Disclosure of Invention
In view of the above, the application provides a flow field uniformity device for improving the self-adaptive use environment for air intake quality, which solves the problem that the flow field uniformity device in the existing test equipment is torn due to uncoordinated deformation transmission, and ensures safe and smooth development of high-altitude simulation tests.
The application provides a improve air intake quality and use flow field homogeneity device of self-adaptation service environment adopts following technical scheme:
the flow field uniformity device comprises a fine rectifier and a coarse rectifier which are sequentially arranged in a shell of an air inlet front chamber according to an air inlet direction, wherein the fine rectifier and the coarse rectifier comprise a plurality of rectifying modules, the rectifying modules are spliced to form a rectifier unit which is matched with the cross section of the radial direction of the air inlet front chamber, the rectifying modules comprise a plurality of crisscross longitudinal grid thin plates and transverse grid thin plates, a plurality of sequentially arranged mounting seams are formed on any side of the longitudinal grid thin plates and the transverse grid thin plates towards the air inlet direction or the air outlet direction, a plurality of sequentially arranged expansion joints are formed on the other side of the longitudinal grid thin plates and the transverse grid thin plates, the length directions of the mounting joints and the expansion joints extend along the air inlet direction, the mounting joints and the expansion joints are arranged in a staggered mode, and the longitudinal grid thin plates and the transverse grid thin plates are connected with each other through the mounting joints in a splicing mode;
the fine rectifier and the coarse rectifier further comprise mounting frames, the rectifier units are mounted in the shell of the air inlet front chamber through the mounting frames, and the outer edges of the mounting frames are free to move relative to the shell of the air inlet front chamber in the radial direction of the shell of the air inlet front chamber.
Optionally, each rectifying module includes an outer wrapping plate, and the crisscrossed longitudinal grid sheets and the transverse grid sheets are fixed in the outer wrapping plate.
Optionally, the fine rectifier and the coarse rectifier each include a rectangular first module, four second modules and four third modules, the center of the first module corresponds with the center of the rectifier unit, four the second modules are respectively abutted to one side of the first module, four the side of the second module far away from the first module is an arc matched with the inner wall of the air inlet front chamber, two adjacent side edges of the second module are parallel to each other, the length of the side abutted by the second module is consistent with that of the first module, the third module is located between the two adjacent second modules, the outer side edge of the third module is an arc matched with the inner wall of the air inlet front chamber, two inner side edges of the third module are perpendicular to each other, one inner side edge of the third module is abutted to the side corresponding to one of the two adjacent second modules, and the other inner side edge of the third module is abutted to the side corresponding to the other second module.
Optionally, the installation frame includes the connecting portion that is located between the adjacent rectifier module and extends to the installation department of rectifier unit periphery, the edge that the rectifier module meets is fixed on the connecting portion, the installation department extends to the end connection of rectifier unit periphery with the connecting portion, the installation department is the arc structure that matches with the shells inner wall of air inlet front chamber, installation department butt air inlet front chamber's shells inner wall in the radial direction of air inlet front chamber's casing is relative the shells free movement of air inlet front chamber.
Optionally, an arc-shaped part is arranged at the connecting position of the connecting part and the mounting part, and the diameter of the arc-shaped part is not less than 10% of the inner diameter of the air inlet front chamber.
Optionally, the fine rectifier and the coarse rectifier each comprise a limiting baffle ring, the limiting baffle rings are abutted against the edge of the exhaust side of the installation frame, and the limiting baffle rings are fixedly connected with the shell of the air inlet front chamber.
Optionally, an expansion hole is arranged at one end of the expansion joint close to the inner side of the longitudinal grid sheet or the transverse grid sheet, the expansion hole is communicated with the expansion joint, the radius of the expansion hole is equal to the width of the expansion joint, and the connecting line of the circle center of the expansion hole and the center of the expansion joint is parallel to the length direction of the expansion joint.
Optionally, a plurality of fairings are arranged on one side of the fine rectifier and the coarse rectifier, which faces the air inlet direction, the length direction of the fairings is parallel to or perpendicular to the side edge of the longitudinal grid sheet, each fairing comprises two opposite installation edges and guide plates which extend from the two installation edges towards the air inlet side and gradually approach each other, one guide plate of each fairing is mutually converged on one side of the guide plate, which is far away from the installation edge, and the fairings are fixedly connected with the shell of the air inlet front chamber.
Optionally, a damping net is arranged on one side of the fine rectifier and one side of the coarse rectifier, which face the air inlet direction, and the damping net is arranged on the shell of the air inlet front chamber.
Optionally, two expansion joints are arranged between two adjacent installation joints on the longitudinal grid sheet and the transverse grid sheet of the rectifying module of the coarse rectifier, a steady flow groove is arranged between two adjacent installation joints, the steady flow groove extends along the length direction of the expansion joints, the length of the extending direction of the steady flow groove is equal to the length of the expansion joints, and the length of the steady flow groove perpendicular to the extending direction is equal to the distance between the sides of the two adjacent expansion joints, which are far away from each other.
In summary, the present application includes the following beneficial technical effects:
the grid sheets forming the rectifier are reserved with expansion holes and expansion gaps, and the grid sheets are mounted in a mounting mode of mounting gaps in a plugging mode, so that the single grid sheets can absorb deformation caused by environmental change, and the phenomenon that the grid sheet joints are torn due to uncoordinated deformation of the grid sheets at different positions is eliminated.
The single module of the rectifier is arranged in the wrapper sheet, and each module is connected with the mounting frame through bolts according to structural characteristics, so that the phenomenon that the connecting weld seam between the module and the mounting frame is torn due to uncoordinated deformation between the modules is avoided.
The installation frame and the air inlet front chamber shell are in smooth transition and are not welded in contact, and the limit baffle ring is arranged behind the installation frame, so that the deformation of the installation frame can be absorbed, and the phenomenon that a weld joint between the installation frame and the air inlet front chamber shell is torn due to deformation and airflow excitation can be eliminated.
The flow field turbulence degree generated by the airflow impacting flow field uniformity device can be effectively reduced by adding the fairing in front of the rectifier; the coarse rectifier grid sheet removes cantilever sheets between expansion joints, so that vibration phenomena of the cantilever metal sheet caused by airflow scouring are eliminated, sudden expansion and wake shearing of airflow at the tail end of a grid unit are weakened, turbulence of a flow field after a rectifier is reduced, space for exchanging airflow momentum and energy is increased, uniformity of the flow field after the rectifier is improved, and the aim of improving quality of an air inlet flow field of an engine is fulfilled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a flow field uniformity apparatus;
FIG. 2 is a schematic diagram of the installation of the rectifier of the present application;
FIG. 3 is a schematic view of the structure of the rectifier unit and mounting frame of the present application;
FIG. 4 is a schematic view of a fine rectifier grid sheet;
FIG. 5 is a schematic view of the structure of a coarse rectifier grid sheet of the present application;
FIG. 6 is a schematic structural view of the mounting frame of the present application;
FIG. 7 is a schematic structural view of a first module, a second module and a third module of the present application;
FIG. 8 is a schematic view of the connection structure of the skin and mounting frame of the present application;
FIG. 9 is a schematic structural view of the cowling of the present application;
fig. 10 is a cross-sectional view taken along A-A in fig. 9.
Reference numerals illustrate: 1. a fine rectifier; 2. a coarse rectifier; 3. a fairing; 31. a mounting edge; 32. a deflector; 4. a rectifying module; 5. an outer wrapping plate; 6. a damping net; 7. transverse grid sheets; 8. longitudinal grid sheets; 9. a mounting seam; 91. an expansion joint; 92. an expansion hole; 93. a steady flow groove; 10. a mounting frame; 11. a limit baffle ring; 12. a third module; 13. a second module; 14. a first module; 15. a connection part; 16. a mounting part; 17. an arc-shaped portion; 20. and (3) an air inlet front chamber.
Detailed Description
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
The embodiment of the application provides a flow field uniformity device for improving the air intake quality and self-adapting to the use environment.
As shown in fig. 1, fig. 2 and fig. 3, a flow field uniformity device for improving air intake quality and self-adapting use environment comprises a fine rectifier 1 and a coarse rectifier 2 which are sequentially installed in a shell of an air intake front chamber 20 according to an air intake direction, wherein each of the fine rectifier 1 and the coarse rectifier 2 comprises a plurality of rectifying modules 4, a plurality of rectifying modules 4 are spliced to form a rectifier unit matched with a radial direction section of the air intake front chamber 20, each rectifying module 4 comprises a plurality of crisscrossed longitudinal grid thin plates 8 and transverse grid thin plates 7, the distance between the longitudinal grid thin plates 8 and the transverse grid thin plates 7 of the fine rectifier 1 is smaller than the distance between the longitudinal grid thin plates 8 and the transverse grid thin plates 7 of the coarse rectifier 2, a plurality of sequentially arranged installation joints 9 are formed on any side, facing the air intake direction or the air exhaust direction, of the longitudinal grid thin plates 8 and the transverse grid thin plates 7 are provided with a plurality of sequentially arranged expansion joints 91, the length directions of the installation joints 9 and the expansion joints 91 extend along the air intake direction, the installation joints 9 and 91 are staggered, and the longitudinal grid thin plates 8 and the transverse grid thin plates 7 are connected with each other through the transverse grid thin plates 7 through the inserted joint connection joints. Specifically, the mounting slits 9 of the longitudinal grid sheet 8 and the transverse grid sheet 7 are opposed, then the longitudinal grid sheet 8 and the transverse grid sheet 7 are brought close to each other, the mounting slits 9 of the longitudinal grid sheet 8 and the transverse grid sheet 7 are superposed, the longitudinal grid sheet 8 and the transverse grid sheet 7 continue to be brought close to each other until the end portions (the middle positions of the sheets) of the two mounting slits 9 abut each other, the mounting slits 9 of the longitudinal grid sheet 8 are positioned at the rear side of the mounting slits 9 of the transverse grid sheet 7 and abut against the solid portions of the transverse grid sheet 7, the mounting slits 9 of the transverse grid sheet 7 are positioned at the rear side of the mounting slits 9 of the longitudinal grid sheet 8 and abut against the solid portions of the transverse grid sheet 7,
the installation allowance of 5% of the thickness of the grid sheet is increased on the basis of ensuring the installation requirement of the thickness of the single grid sheet, the grid sheet is installed in a plugging manner, welding is not performed between the longitudinal grid sheet 8 and the transverse grid sheet 7, and the grid sheet is reserved with the expansion gaps 91, so that the single grid sheet is not only beneficial to absorbing deformation quantity generated by environmental change, but also the phenomenon of tearing at the joint of the grid sheet due to uncoordinated deformation of the grid sheet at different positions is eliminated.
As shown in fig. 4 and 5, the mounting slits 9 of the grid sheet of the fine rectifier 1 are spaced less than the spacing of the expansion slits 91. The interval of the installation slit 9 of the grid sheet metal of the coarse rectifier 2 is greater than the interval of the expansion slit 91, and the central line of the installation slit 9 aligns with the central line of two expansion slits 91, be provided with two expansion slits 91 between two adjacent installation slits 9 on the longitudinal grid sheet metal 8 of the rectification module 4 of the coarse rectifier 2 and the transverse grid sheet metal 7, adjacent two set up steady flow groove 93 in the middle of two expansion slits 91 between the installation slit 9, steady flow groove 93 extends along expansion slit 91 length direction, steady flow groove 93 extending direction's length equals expansion slit 91 length, steady flow groove 93's perpendicular to extending direction's length equals the distance of the side that two adjacent expansion slits 91 kept away from each other. In this embodiment, the blank area, that is, the steady flow groove 93 is formed by cutting out the metal plate between the two expansion joints 91 between the adjacent two installation joints 9. The metal plates between the two expansion joints 91 between the two adjacent mounting joints 9 are of cantilever structures, and the steady flow grooves 93 formed after removing the metal plates not only eliminate the vibration phenomenon of the cantilever metal plates caused by air flow scouring, but also weaken the sudden expansion and wake shearing of the air flow at the tail end of the grid unit, reduce the turbulence of the flow field after the rectifier, increase the space for exchanging the air flow momentum and energy, improve the uniformity of the flow field after the rectifier, and achieve the aim of improving the quality of the air inlet flow field of the engine.
In one embodiment, an expansion hole 92 is arranged at one end of the expansion slit 91 near the inner side of the longitudinal grid sheet 8 or the transverse grid sheet 7, the expansion hole 92 is communicated with the expansion slit 91, the radius of the expansion hole 92 is equal to the width of the expansion slit 91, and the connecting line of the center of the expansion hole 92 and the center of the expansion slit 91 is parallel to the length direction of the expansion slit 91.
The fine rectifier 1 and the coarse rectifier 2 further comprise a mounting frame 10, the rectifier unit is mounted in the housing of the air intake front chamber 20 through the mounting frame 10, and the outer edge of the mounting frame 10 is free to move relative to the housing of the air intake front chamber 20 in the radial direction of the housing of the air intake front chamber 20.
As shown in fig. 3 and 6, specifically, the mounting frame 10 includes a connection portion 15 between adjacent rectifying modules 4 and a mounting portion 16 extending to the periphery of the rectifier unit, the edge where the rectifying modules 4 meet is fixed on the connection portion 15, the mounting portion 16 is connected with the end portion of the connection portion 15 extending to the periphery of the rectifier unit, the mounting portion 16 is in an arc structure matching with the inner wall of the housing of the air intake front chamber 20, the mounting portion 16 abuts against the inner wall of the housing of the air intake front chamber 20, and the mounting portion 16 is free to move relative to the housing of the air intake front chamber 20 in the radial direction of the housing of the air intake front chamber 20. The mounting part 16 is in contact with the inner wall of the shell but is not welded and fixed, the mounting frame 10 can freely expand and contract within a certain range, the deformation of the mounting frame 10 is absorbed, the uncoordinated deformation of the mounting frame 10 is reduced, and the phenomenon that the welding seam between the mounting frame 10 and the shell of the air inlet front chamber 20 is torn due to deformation and air flow excitation can be eliminated by adopting a non-welding mode.
The connecting position of the connecting part 15 and the mounting part 16 is provided with an arc-shaped part 17, and the diameter of the arc-shaped part 17 is not less than 10% of the inner diameter of the air inlet front chamber 20.
The thickness of the installation frame 10 is selected according to the weight of the rectifying module 4, the middle four straight plates are two-by-two crossed straight plates, the middle four straight plates are used as connecting parts 15, eight arc-shaped parts 17 which are in contact with the shell of the air inlet front chamber 20 and are not welded are arranged around the middle four straight plates, the arc-shaped parts 17 are used as transition plates connected with the installation parts 16 by the connecting parts 15, the arc diameter of each arc-shaped part 17 is not less than 10% of the inner diameter of the front chamber, the straight plates and the arc-shaped transition plates are welded to form the installation frame 10, and the straight plates and the arc-shaped transition plates are arranged at the designed position of the air inlet front chamber 20. The arc-shaped mounting part 16 is not welded with the inner wall of the shell in a pressing way, and a gap exists between the mounting part 16 and the rectifier unit.
The fine rectifier 1 and the coarse rectifier 2 both comprise a limiting baffle ring 11, the limiting baffle ring 11 is abutted against the edge of the installation frame 10, which faces the exhaust side of the air inlet front chamber 20, and the limiting baffle ring 11 is fixedly connected with the shell of the air inlet front chamber 20. The limit stop ring 11 is used for limiting the displacement of the installation frame 10 along the air flow direction caused by air flow scouring, and the installation of the installation frame 10 is completed by abutting the installation part 16 of the installation frame 10 and the inner wall of the air inlet front chamber 20. Specifically, the limiting stop ring 11 includes an outer ring and a radially inward protruding inner ring, the outer ring is fixedly connected with the air inlet front chamber 20 through bolts, the inner ring extends to the inner side of the outer ring at one end of the outer ring, and the inner ring is used for abutting against the mounting frame 10.
As shown in fig. 7 and 8, each of the rectifying modules 4 includes an exterior sheathing board 5, and the crisscrossed longitudinal grid sheets 8 and transverse grid sheets 7 are fixed in the exterior sheathing board 5.
As shown in fig. 3 and 7, the fine rectifier 1 and the coarse rectifier 2 each include a rectangular first module 14, four second modules 13 and four third modules 12, the centers of the first modules 14 correspond to the centers of the rectifier units, the four second modules 13 are respectively abutted against one side edge of the first module 14, one side edge of the four second modules 13 away from the first module 14 is an arc matched with the inner wall of the air inlet front chamber 20, two adjacent side edges of the second modules 13 and the first module 14 are parallel to each other, the length of the abutted side edge of the second module 13 and the first module 14 is consistent, the third module 12 is located between the two adjacent second modules 13, the outer side edge of the third module 12 is an arc matched with the inner wall of the air inlet front chamber 20, two inner side edges of the third module 12 are perpendicular to each other, one inner side edge of the third module 12 is abutted against the corresponding side edge of one second module 13 of the two adjacent second modules 13, and the other inner side edge of the third module 12 is abutted against the corresponding side edge of the other two adjacent second modules 13. The third module 12 is in a sector shape, the outer side of the third module 12 is in a circular arc of the sector shape, and the inner side corresponds to two radiuses.
In the embodiment of the present application, eight mounting portions 16 of the mounting frame 10 wrap two ends of the outer side edges of the four fan-shaped third modules 12 respectively, and the inner diameter of the arc-shaped structure of the mounting portions 16 is larger than the outer diameter of the outer side edges of the fan-shaped third modules 12; each rectifying module is installed through the installing frame, and the rectifying module is not in direct contact with the inner wall of the shell of the air inlet front chamber. The arc sections are arranged at two positions where the radius of the fan-shaped third module 12 is intersected with the arc, the corresponding position of the outer wrapping plate 5 of the third module 12 is also arc-shaped, the arc sections correspond to the arc-shaped part 17 of the mounting frame 10, the outer diameter of the outer side edge of the fan-shaped third module 12 is smaller than the inner diameters of the air inlet front chamber 20 and the mounting part 16, the outer diameter of the outer side edge of the second module 13 is smaller than the inner diameter of the mounting part 16 of the air inlet front chamber 20, gaps exist between the mounting part 16 and the arc-shaped part 17 and the outer wrapping plate 5 of the third module 12, the mounting frame 10 can be freely expanded and contracted within a certain range, the deformation of the mounting frame 10 is absorbed, and the uncoordinated deformation of the mounting frame 10 is reduced.
In one embodiment, the shape of the wrapper sheet 5 corresponds to the respective outer contour of each of the rectifying modules 4, and one side edge of the wrapper sheet 5 is provided with three welding points with the longitudinal grid sheet 8 and the transverse grid sheet 7 for fixedly connecting the sheets together. The welding points of the cladding plate 5 and the grid sheet are reduced while ensuring stability between the grid sheets. Opposite sides of the outer cover plates 5 of the adjacent two rectifying modules 4 are butted on the connecting portion 15, and the two opposite sides of the outer cover plates 5 and the connecting portion 15 are fixedly connected through bolts.
The rectifying units are arranged in the outer wrapping plate 5, each rectifying module 4 is connected with the mounting frame 10 through bolts according to structural characteristics, the phenomenon that connecting welding seams between the modules and the mounting frame 10 are torn due to incoordination between the modules is avoided, the outer wrapping plate 5 is attached to the inner surface of a connecting portion 15 of the mounting frame 10, and the reserved bolt holes in the outer wrapping plate 5 are connected with the mounting frame 10. The outer wrapping plate 5 is attached to the inner surface of the mounting frame 10 at the mounting position, bolt holes are reserved in the outer wrapping plate 5, and the bolt holes reserved between the adjacent rectifying modules 4 and between the rectifying modules 4 and the mounting frame 10 are aligned.
In one embodiment, the longitudinal grid sheets 8 and the transverse grid sheets 7 are machined according to the outline dimensions of the outer cladding 5 of each fairing module 4 of different specifications, and the mounting slots 9 of the grid sheets within a single fairing module 4 should be uniform, the expansion holes 92 and expansion slots 91 should be evenly distributed and the overall size of the expansion slots 91 should be no less than the overall deformation of a single grid sheet in the environment of use.
As shown in fig. 2, 9 and 10, a plurality of fairings 3 are arranged on one side of the fine rectifier 1 and the coarse rectifier 2 facing the air inlet direction, the length direction of the fairings 3 is parallel or perpendicular to the side edge of the longitudinal grid sheet 8, the fairings 3 comprise two opposite mounting edges 31 and guide plates 32 extending from the two mounting edges 31 towards the air inlet side and gradually approaching each other, one side of the guide plates 32 of the fairings 3 away from the mounting edges 31 is mutually converged, and the fairings 3 are fixedly connected with the housing of the air inlet front chamber 20.
The fine rectifier 1 and the coarse rectifier 2 are provided with a damping net 6 on the side facing the air intake direction, the damping net 6 being mounted on the housing of the air intake front chamber 20.
The fairing 3 can effectively reduce flow field turbulence generated by incoming flow impact, can effectively improve the quality of the rectified flow field, and meanwhile, the damping net 6 can block redundant matters in the air inlet pipeline in front of the rectifier, so that safe operation of a test is ensured. In one embodiment, the cowling 3 is provided with a plurality of rows and a plurality of columns, the cowling 3 of one column is continuously arranged, the cowling 3 of one row comprises a plurality of small sections of cowling 3 positioned between two adjacent columns, a stamping grinding tool is prefabricated according to the design shape of the cowling 3, a 2mm thin plate is integrally stamped and formed, and bolt holes are reserved on the straight edge sections (mounting edges 31) of the cowling 3, and the bolt holes are consistent with the mounting holes of the damping net 6.
When in field installation, the rectifying modules 4 with different specifications are installed in the installation frame 10 according to the sequence from bottom to top, adjacent rectifying modules 4 are connected with the installation frame 10 through bolts, and after the installation is completed, the rear end of the installation frame 10 is tightly attached to the limit baffle ring 11, wherein the outer ring of the limit baffle ring 11 is fixed on the backing plate of the inner wall of the front chamber shell through bolts.
After the rectifying module 4 is installed, the damping net 6 is placed in the installation frame 10 in front of the rectifying module 4 according to a mature process (3 spot welding positions are allowed to exist on each installation edge 31), the straight edge of the fairing 3 is lapped on the pressing plate of the damping net 6, and the fairing 3 and the damping net 6 are installed on the installation frame 10 through bolts.
The flow field uniformity device self-adaptive use environment principle specific implementation process provided by the application is as follows:
according to the test state requirement, the air inlet front chamber 20 and the rectifier work under the high temperature or negative temperature environment, the deformation generated by the temperature change of the grid sheet is absorbed by the expansion holes 92 and the expansion gaps 91 of the grid sheet, and the total length of the expansion gaps 91 is larger than the deformation caused by the temperature, so that the deformation transmission is not performed, namely the deformation of the rectifier module 4 is not transmitted to the mounting frame 10 and the adjacent rectifier module 4; meanwhile, the mounting frame 10 is absorbed by the arc transition section (the arc transition section refers to the arc-shaped part 17 and the mounting part 16) at the non-welding part contacted with the air inlet front chamber 20 under the temperature deformation, the bending compensation capacity of the arc transition section is larger than the deformation caused by the temperature, and meanwhile, the mounting part 16 is contacted with the air inlet front chamber 20 and is not welded, so that the contact part can freely stretch out and draw back, the deformation of the mounting frame 10 can not be transmitted between the rectifying module 4 and the air inlet front chamber 20, and the purpose of self-adapting use environment of the flow field uniformity device is realized.
The rectifying module 4 divides the air flow into air flow units, and the straight flow lines are pulled in each unit to achieve the purpose of flow equalization, cantilever metal plates of adjacent expansion holes 92 are removed at grid thin plates of the coarse rectifying module 4, the sufficient exchange of momentum and energy can be realized at the tail end of the coarse rectifying module 4, the shearing action of wake generated by the thickness of the grid thin plates on a flow field is weakened, the turbulence of the flow field after the coarse rectifying module 2 is reduced, and the effect of uniform flow field is further realized.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The flow field uniformity device for improving the air intake quality is used in a self-adaptive use environment and comprises a fine rectifier and a coarse rectifier which are sequentially arranged in a shell of an air intake front chamber according to an air intake direction, and is characterized in that the fine rectifier and the coarse rectifier comprise a plurality of rectifier modules, the rectifier modules are spliced to form rectifier units matched with the cross section of the air intake front chamber in the radial direction, the rectifier modules comprise a plurality of crisscrossed longitudinal grid thin plates and transverse grid thin plates, a plurality of mounting joints which are sequentially arranged are formed on any side of the longitudinal grid thin plates and the transverse grid thin plates towards the air intake direction or the air exhaust direction, a plurality of expansion joints which are sequentially arranged are formed on the other side of the longitudinal grid thin plates and the transverse grid thin plates, the length directions of the mounting joints and the expansion joints extend along the air intake direction, the mounting joints and the expansion joints are arranged in a staggered manner, and the longitudinal grid thin plates and the transverse grid thin plates are mutually connected through the mounting joints in a splicing manner;
the fine rectifier and the coarse rectifier further comprise mounting frames, the rectifier units are mounted in the shell of the air inlet front chamber through the mounting frames, and the outer edges of the mounting frames are free to move relative to the shell of the air inlet front chamber in the radial direction of the shell of the air inlet front chamber.
2. The adaptive service environment flow field uniformity apparatus for improving air intake quality according to claim 1, wherein each of said flow straightening modules comprises an outer wrap plate within which said crisscrossed longitudinal grid sheets and transverse grid sheets are secured.
3. The flow field uniformity device for improving an air intake quality according to claim 1, wherein the fine rectifier and the coarse rectifier each comprise a rectangular first module, four second modules and four third modules, the centers of the first modules correspond to the centers of the rectifier units, the four second modules are respectively abutted against one side of the first modules, one side of the four second modules away from the first module is an arc matched with an inner wall of an air intake front chamber, two side edges of the second modules adjacent to the first module are parallel to each other, the length of the side edge of the second module abutted against the first module is consistent, the third module is positioned between the two adjacent second modules, the outer side edge of the third module is an arc matched with an inner wall of the air intake front chamber, two inner side edges of the third module are perpendicular to each other, one inner side edge of the third module is abutted against one side edge of the second modules adjacent to the two second modules, and the other inner side edge of the third module is abutted against the side edge of the other second module adjacent to the two second modules.
4. The flow field uniformity device for improving an air intake quality according to claim 1, wherein the mounting frame comprises a connecting portion between adjacent rectifier modules and a mounting portion extending to an outer periphery of the rectifier unit, edges of the rectifier modules connected to each other are fixed on the connecting portion, the mounting portion is connected with an end portion of the connecting portion extending to the outer periphery of the rectifier unit, the mounting portion is of an arc-shaped structure matching with an inner wall of a housing of an air intake front chamber, the mounting portion abuts against the inner wall of the housing of the air intake front chamber, and the mounting portion is free to move relative to the housing of the air intake front chamber in a radial direction of the housing of the air intake front chamber.
5. The flow field uniformity device for improving an air intake quality according to claim 4, wherein an arc-shaped portion is provided at a connection position of the connection portion and the installation portion, and a diameter of the arc-shaped portion is not less than 10% of an inner diameter of the air intake front chamber.
6. The flow field uniformity device for improving an air intake quality adaptive to a use environment according to claim 1, wherein the fine rectifier and the coarse rectifier each comprise a limiting baffle ring, the limiting baffle ring abuts against an edge of an air exhaust side of the mounting frame, and the limiting baffle ring is fixedly connected with a housing of an air intake front chamber.
7. The flow field uniformity device for improving an air intake quality according to claim 1, wherein an expansion hole is formed at one end of the expansion slit near the inner side of the longitudinal grid sheet or the transverse grid sheet, the expansion hole is communicated with the expansion slit, the radius of the expansion hole is equal to the width of the expansion slit, and the connecting line of the center of the expansion hole and the center of the expansion slit is parallel to the length direction of the expansion slit.
8. The flow field uniformity device for improving an air intake quality according to claim 1, wherein a side of the fine and coarse rectifiers facing an air intake direction is provided with a plurality of fairings, the lengthwise direction of the fairings is parallel or perpendicular to the side of the longitudinal grid sheet, the fairings comprise two opposite mounting sides and guide plates extending from the two mounting sides toward the air intake side and gradually approaching each other, the sides of the guide plates of one of the fairings facing away from the mounting sides meet each other, and the fairings are fixedly connected with a housing of an air intake front chamber.
9. The flow field uniformity device for improving an air intake quality adaptive to an environment of use according to claim 1, wherein a damping net is provided on a side of the fine rectifier and the coarse rectifier facing an air intake direction, and the damping net is mounted on a housing of an air intake front chamber.
10. The flow field uniformity device for improving air intake quality and self-adapting use environment according to claim 1, wherein two expansion joints are arranged between two adjacent installation joints on a longitudinal grid sheet and a transverse grid sheet of a rectifying module of the coarse rectifier, a steady flow groove is arranged between two expansion joints between two adjacent installation joints, the steady flow groove extends along the length direction of the expansion joints, the length of the steady flow groove in the extending direction is equal to the length of the expansion joints, and the length of the steady flow groove perpendicular to the extending direction is equal to the distance between the sides of the two adjacent expansion joints, which are far away from each other.
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| CN115931368A (en) | 2023-04-07 |
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