Afterburner inlet flow field simulation device capable of adjusting air inlet cosine angle

Abstract

The invention provides an afterburner inlet flow field simulation device capable of adjusting an air inlet cosine angle, which comprises an inner culvert inner cylinder, an outer culvert inner cylinder and an outer culvert outer cylinder which are sequentially sleeved from inside to outside, and further comprises guide blades which are arranged in the circumferential direction, and the bottom ends of the guide blades are tightly connected with the inner culvert inner cylinder; the linkage structure comprises a driving device fixed to the outer culvert outer barrel, the driving end of the driving device is connected with a driving shaft, the bottom end of the driving shaft is in matched transmission with a spline shaft, the linkage structure further comprises a linkage ring, and the spline shaft is connected with the linkage ring so as to drive the linkage ring to rotate through a transmission structure of the driving shaft and the spline shaft; the guide blades sequentially penetrate through the outer culvert inner barrel and the outer culvert outer barrel, the end of the guide blade located under the spline shaft is connected with the spline shaft in a fastened mode, and the ends of the other guide blades are connected to the linkage ring through bolts and connecting pieces. According to the invention, the angles of the air inlet guide blades are adjusted through continuous change, so that afterburner test environment simulation of different air inlet cosine angles is realized.

Description

Technical Field

[0001] The invention relates to the field of afterburner testing of an aero-engine, and in particular to an afterburner inlet flow field simulation device with an adjustable air intake cosine angle. Background Art

[0002] The afterburner is located between the turbine and the tailpipe. Due to the radial, circumferential, and axial nonuniformity of the low-pressure turbine outlet airflow, the velocity distribution at the afterburner inlet section exhibits high and low velocity regions. Traditional afterburner inlet airflow cosine angle simulators utilize fixed blades, which can only simulate a single test condition. The replacement process is cumbersome and time-consuming, significantly increasing test costs and cycle times. Existing cosine angle inlet simulators are unable to meet the requirements of inlet flow field simulation tests across multiple test conditions. Summary of the Invention

[0003] In view of this, an embodiment of the present application provides an afterburner inlet flow field simulation device with an adjustable intake cosine angle, which solves the problem that traditional intake simulation devices can only meet a single test state. By continuously changing and adjusting the intake guide vane angle, the afterburner test environment simulation with different intake cosine angles can be achieved.

[0004] The present application provides the following technical solution: a device for simulating the inlet flow field of an afterburner with an adjustable intake cosine angle, comprising:

[0005] The inner cylinder, the outer cylinder and the outer cylinder are sequentially sleeved from the inside to the outside, the inner cylinder, the outer cylinder and the outer cylinder are respectively connected to the test piece and the test equipment, the annular cavity between the inner cylinder and the outer cylinder constitutes an inner simulation flow channel, and the annular cavity between the outer cylinder and the outer cylinder constitutes an outer simulation flow channel; and further comprising circumferentially arranged guide blades, the bottom ends of the guide blades being tightly connected to the inner cylinder;

[0006] A linkage structure, wherein the linkage structure includes a driving device fixed on the outer cylinder of the outer culvert, the driving end of the driving device is connected to the driving shaft, and the bottom end of the driving shaft cooperates with the spline shaft for transmission. The linkage structure also includes a linkage ring, and the spline shaft is connected to the linkage ring to drive the linkage ring to rotate through the transmission structure of the driving shaft and the spline shaft; the guide blades pass through the inner cylinder of the outer culvert and the outer cylinder of the outer culvert in sequence, and the end of the guide blade located directly below the spline shaft is fastened to the spline shaft, and the ends of the remaining guide blades are respectively connected to the linkage ring through a pin and a connecting plate, so that when the linkage ring rotates, the connecting plate is driven to rotate along the Y axis by the shear force of the pin, so that the connecting plate drives the remaining guide blades to rotate along the Z axis.

[0007] According to one embodiment of the present application, the linkage structure also includes a drive shaft fixing bracket, the drive shaft is fixed on the drive shaft fixing bracket, the drive shaft fixing bracket is fastened to the outer cylinder of the outer culvert by screws, and the drive shaft fixing bracket is tightly fitted with the spline shaft.

[0008] According to one embodiment of the present application, a groove structure is set in the middle of the linkage ring, one end of the spline shaft is embedded in the groove, and a fixing pin passes through the joint ball bearing, the spline shaft and the linkage ring to link the spline shaft with the linkage ring.

[0009] According to one embodiment of the present application, the device further includes a bushing, which is precisely matched with the guide vane, the spline shaft and the outer cylinder of the outer culvert, so that the guide vane can be reliably positioned along the Z-axis direction.

[0010] According to one embodiment of the present application, the device further includes a floating ring, which is sleeved between the inner cylinder of the outer cladding and the outer cylinder of the outer cladding, and the floating ring is clearance-fitted with the inner cylinder of the outer cladding.

[0011] According to one embodiment of the present application, the installation gap between the outer cylinder of the outer culvert and the guide vane is fixedly sealed by a sealing cover plate, and a graphite gasket is provided between the outer cylinder of the outer culvert and the sealing cover plate.

[0012] According to one embodiment of the present application, a joint ball bearing is provided at the pin connection between the connecting piece and the linkage ring.

[0013] According to one embodiment of the present application, a dial is provided on the drive shaft for reading the rotation angle of the drive shaft.

[0014] According to one embodiment of the present application, the driving device adopts a servo electric cylinder.

[0015] Compared with the prior art, the beneficial effects achieved by at least one of the above-mentioned technical solutions employed in the embodiments of this specification include at least the following: The embodiments of the present invention address high-temperature, swirling inlet airflow environments characterized by high afterburner inlet temperatures and a wide range of intake cosine angle adjustment. A device for simulating the flow field at an afterburner inlet with an adjustable intake cosine angle is proposed. This device can simulate the distribution of afterburner inlet cosine angles and ensure stable and reliable operation of the adjustable intake device. Furthermore, through the design of a servo electric cylinder and transmission mechanism, the intake simulation device can adjust the intake cosine angle, ensuring continuous adjustment of the cosine angle under different test conditions. This improves test efficiency, reduces test costs and cycle time, and further supports the efficient conduct of aircraft engine afterburner performance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A cross-sectional view of a device for simulating the inlet flow field of an afterburner with an adjustable intake cosine angle according to an embodiment of the present invention;

[0018] Figure 2 A second cross-sectional view of a device for simulating the inlet flow field of an afterburner with an adjustable intake cosine angle according to an embodiment of the present invention;

[0019] Among them, 1-servo electric cylinder, 2-drive shaft fixing bracket, 3-bushing, 4-floating ring, 5-drive shaft, 6-spline shaft, 7-first joint ball bearing, 8-fixing pin, 9-linkage ring, 10-outer cylinder, 11-outer cylinder, 12-guide blade, 13-inner cylinder, 14-pin, 15-second joint ball bearing, 16-blade support seat, 17-connecting plate, 18-fastening screw, 19-sealing cover, 20-graphite gasket. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0021] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0022] like Figure 1-Figure 2 As shown, an embodiment of the present invention provides an afterburner inlet flow field simulation device with adjustable intake cosine angle, comprising:

[0023] The inner cylinder 13, the outer cylinder 11 and the outer cylinder 10 are sequentially sleeved from the inside to the outside, and the inner cylinder 13, the outer cylinder 11 and the outer cylinder 10 are respectively connected to the test piece and the test equipment. The annular cavity between the inner cylinder 13 and the outer cylinder 11 constitutes an inner simulated flow channel, and the annular cavity between the outer cylinder 11 and the outer cylinder 10 constitutes an outer simulated flow channel; the guide blades 12 are also arranged circumferentially, and the bottom ends of the guide blades 12 are tightly connected to the inner cylinder 13;

[0024] The linkage structure includes a driving device fixed to the outer cylinder 10 of the outer culvert, the driving end of the driving device is connected to the driving shaft 5, the bottom end of the driving shaft 5 cooperates with the spline shaft 6 for transmission, and the linkage structure also includes a linkage ring 9, the spline shaft 6 is connected to the linkage ring 9, so as to drive the linkage ring 9 to rotate through the transmission structure of the driving shaft 5 and the spline shaft 6; the guide blades 12 pass through the inner cylinder 11 and the outer cylinder 10 of the outer culvert in sequence, and the end of the guide blade 12 located directly below the spline shaft 6 is fastened to the spline shaft 6, and the ends of the remaining guide blades 12 are respectively connected to the linkage ring 9 through the latch 14 and the connecting piece 17, so that when the linkage ring 9 rotates, the shear force of the latch 14 drives the connecting piece 17 to rotate along the Y axis, so that the connecting piece 17 drives the remaining guide blades 12 to rotate along the Z axis. The ends of the guide blades 12 are supported and fixed by the blade support seat 16.

[0025] In one embodiment of the present invention, the linkage structure also includes a drive shaft fixing bracket 2, the drive shaft 5 is fixed on the drive shaft fixing bracket 2, the drive shaft fixing bracket 2 is fastened to the outer cylinder 10 by screws, and the drive shaft fixing bracket 2 is tightly fitted with the spline shaft 6.

[0026] In one embodiment of the present invention, a groove structure is set in the middle of the linkage ring 9, one end of the spline shaft 6 is embedded in the groove, and a fixing pin 8 passes through the first joint ball bearing 7, the spline shaft 6 and the linkage ring 9 to link the spline shaft 6 with the linkage ring 9.

[0027] In one embodiment of the present invention, the device further comprises a bushing 3, which is precisely matched with the guide vane 12, the spline shaft 6 and the outer cylinder 10, so that the guide vane 12 is reliably positioned along the Z-axis direction.

[0028] In one embodiment of the present invention, the device further comprises a floating ring 4 , which is sleeved between the outer culvert inner cylinder 11 and the outer culvert outer cylinder 10 , and the floating ring 4 is clearance-fitted with the outer culvert inner cylinder 11 .

[0029] In one embodiment of the present invention, the installation gap between the outer cylinder 10 of the outer culvert and the guide vanes 12 is fixedly sealed by a sealing cover plate 19 , and a graphite gasket 20 is provided between the outer cylinder 10 of the outer culvert and the sealing cover plate 19 .

[0030] In one embodiment of the present invention, a second joint ball bearing 15 is provided at the pin connection between the connecting piece 17 and the linkage ring 9 to prevent jamming.

[0031] In one embodiment of the present invention, a dial is provided on the driving shaft 5 for reading the rotation angle of the driving shaft 5 .

[0032] In specific implementation, the drive device uses a servo cylinder 1. The servo cylinder 1 is connected to the rocker arm, which is connected to the drive shaft 5 using a square hole groove structure. The combined movement of the servo cylinder 1 and the rocker arm generates a driving torque, which further drives the drive shaft 5 to rotate along the Z axis. The drive shaft fixing bracket 2 fits tightly with the spline shaft 6 and is fastened to the outer cylinder 10 of the outer liner via screws. The bushing 3 precisely fits with the guide vane 12. One end of the floating ring 4 precisely fits with the guide vane 12, and the other end has a clearance fit with the outer cylinder 11 of the outer liner. The fixing pin 8 penetrates into the first joint ball bearing 7 and is fixed to the linkage ring 9. The inner cylinder 13 of the inner liner fits tightly with the lower end of the guide vane 12 and is fastened via bolts.

[0033] Specifically, the servo cylinder 1 stretches along the Y-axis, enabling the drive shaft 5 to rotate along the Z-axis via a square hole structure. This circumferential rotation of the drive shaft 5 along the Z-axis drives the spline shaft 6, which in turn drives the linkage ring 9 along the Y-axis. The bushing 3 precisely mates with the guide vanes 12, the spline shaft 6, and the outer cylinder 10 of the outer culvert, ensuring reliable positioning of the guide vanes 12 along the Z-axis. A clearance fit between the floating ring 4 and the inner cylinder 11 of the outer culvert ensures expansion clearance between the outer and inner culvert intakes at different temperatures, preventing damage to the entire device from expansion deformation caused by large temperature differences.

[0034] Specifically, the outer culvert outer cylinder 10, the inner culvert inner cylinder 11, and the inner culvert inner cylinder 13 are connected to the test specimen and test equipment to ensure smooth flow and no sudden changes. When the linkage ring 9 rotates, it transmits force to the latch 14, which in turn drives the connecting piece 17 to rotate along the Y-axis, causing the guide vanes 12 of the remaining cross-sections to rotate along the Z-axis. A graphite gasket 20 is placed between the outer culvert outer cylinder 10 and the sealing cover plate 19, secured by screws 18, to ensure that the gas in the third culvert is isolated from the gas in the outer culvert flow channel.

[0035] During the specific implementation of the embodiment of the present invention, the floating ring 4 is first mounted on the outer ferrule inner cylinder 11 and the outer ferrule outer cylinder 10, and then the guide blade 12 is sequentially passed through the outer ferrule inner cylinder 11, the outer ferrule outer cylinder 10, the bushing 3, and the spline shaft 6 along the positive direction of the Z axis, and the guide blade 12 directly below the spline shaft 6 is fastened to the spline shaft 6 by bolts; the inner ferrule inner cylinder 13 is in a split form, fastened by screws and precisely matched with the end of the guide blade 12; a groove structure is provided in the middle of the linkage ring 9, one end of the spline shaft 6 is embedded in the groove, and the fixing pin 8 passes through the first joint ball bearing 7, the spline shaft 6, and the linkage ring 9, thereby realizing the transmission of the spline shaft 6 and the linkage ring 9; one end of the drive shaft 5 is clearance-matched with the spline shaft 6 to ensure the meshing clearance of the spline transmission, and the other end is connected to the servo electric cylinder 1 to realize the joint transmission of the drive shaft 5 and the spline.

[0036] The drive and transmission process of the embodiment of the present invention is as follows: To ensure that the servo cylinder can drive the guide vanes to rotate along the Z-axis, a transmission chain consisting of a servo cylinder, drive shaft, spline, linkage ring, connecting plate, and guide vanes is employed. First, the servo cylinder moves along the Y-axis, driving the rocker arm. The connection between the rocker arm and the drive shaft 5 is a square slot structure. The combined motion of the servo cylinder and rocker arm generates a driving torque, which further drives the drive shaft 5 to rotate along the Z-axis. The lower end of the drive shaft 5 is splined. Rotation of the drive shaft 5 along the Z-axis simultaneously drives the spline shaft 6 along the Z-axis, maintaining synchronization. The rotation angle can be read in real time on a dial. The spline shaft 6 rotates along the Z-axis, driving the guide vanes 12 directly below along the Z-axis. Simultaneously, because the tail of the spline is securely connected to the fixing pin 8, the linkage ring 9 rotates along the Y-axis through the fixing pin 8. The linkage ring's rotation, through the shear force of the latch, drives the connecting plate along the Y-axis. Finally, the rotation of the connecting plate drives the remaining guide vanes along the Z-axis, forming the drive system. Drive system: The linkage ring 9 rotates along the Y-axis, and its tightly fitting pin drives the entire connecting piece along the Y-axis. To prevent binding, a joint ball bearing is installed between the pin and the connecting piece 17, allowing for multi-angle rotation. The other end of the connecting piece 17 engages with the guide vanes 12 through a square groove. Rotation of the connecting piece 17 drives the guide vanes 12 along the Z-axis, thus achieving linkage between the drive and transmission systems. This ensures synchronous rotation of all 40 guide vanes 12, enabling continuous and uninterrupted adjustment of the intake cosine angle.

[0037] The sealing measures in this embodiment of the present invention include: To prevent high-temperature combustion gas from the inner duct from entering the outer duct and damaging its hot-end components, while also ensuring reliable operation and non-stagnation of the guide vanes despite the large temperature difference between the inner and outer ducts, the guide vane shafts are precisely matched to the floating rings, which are then properly spaced from the outer and inner casings. Thermal expansion is calculated to ensure the clearance between the floating rings and the casings meets expansion requirements. Furthermore, the gas temperature difference between the third duct and the outer duct is minimal. A graphite gasket is placed between the two, and a sealing cover plate is tightened with bolts to isolate the gas between the two channels.

[0038] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A device for simulating the inlet flow field of an afterburner with an adjustable intake cosine angle, characterized in that: include: The inner cylinder, the outer cylinder and the outer cylinder are sequentially sleeved from the inside to the outside, the inner cylinder, the outer cylinder and the outer cylinder are respectively connected to the test piece and the test equipment, the annular cavity between the inner cylinder and the outer cylinder constitutes an inner simulation flow channel, and the annular cavity between the outer cylinder and the outer cylinder constitutes an outer simulation flow channel; and further comprising circumferentially arranged guide blades, the bottom ends of the guide blades being tightly connected to the inner cylinder; A linkage structure, wherein the linkage structure includes a driving device fixed on the outer cylinder of the outer culvert, the driving end of the driving device is connected to the driving shaft, and the bottom end of the driving shaft cooperates with the spline shaft for transmission. The linkage structure also includes a linkage ring, and the spline shaft is connected to the linkage ring to drive the linkage ring to rotate through the transmission structure of the driving shaft and the spline shaft; the guide blades pass through the inner cylinder of the outer culvert and the outer cylinder of the outer culvert in sequence, and the end of the guide blade located directly below the spline shaft is fastened to the spline shaft, and the ends of the remaining guide blades are respectively connected to the linkage ring through a pin and a connecting plate, so that when the linkage ring rotates, the connecting plate is driven to rotate along the Y axis by the shear force of the pin, so that the connecting plate drives the remaining guide blades to rotate along the Z axis.

2. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: The linkage structure also includes a drive shaft fixing bracket, the drive shaft is fixed on the drive shaft fixing bracket, the drive shaft fixing bracket is fastened to the outer cylinder of the outer culvert via screws, and the drive shaft fixing bracket is tightly fitted with the spline shaft.

3. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: A groove structure is provided in the middle of the linkage ring, one end of the spline shaft is embedded in the groove, and a fixing pin passes through the joint ball bearing, the spline shaft and the linkage ring to link the spline shaft with the linkage ring.

4. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: The device further comprises a bushing, which is precisely matched with the guide vane, the spline shaft and the outer cylinder of the outer culvert, so that the guide vane can be reliably positioned along the Z-axis direction.

5. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: The device further comprises a floating ring, which is sleeved between the inner cylinder of the outer cladding and the outer cylinder of the outer cladding, and the floating ring and the inner cylinder of the outer cladding are in clearance fit.

6. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: The installation gap between the outer cylinder of the outer culvert and the guide blades is fixedly sealed by a sealing cover plate, and a graphite gasket is arranged between the outer cylinder of the outer culvert and the sealing cover plate.

7. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: A joint ball bearing is provided at the pin connection between the connecting piece and the linkage ring.

8. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: A scale plate is provided on the driving shaft for reading the rotation angle of the driving shaft.

9. The afterburner inlet flow field simulation device with adjustable intake cosine angle according to claim 1, characterized in that: The driving device adopts a servo electric cylinder.

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