Reverse thrust exhaust flow guide method for aero-engine reverse thrust test

Abstract

The invention discloses a reverse thrust exhaust flow guide method for an aero-engine reverse thrust test, and belongs to the technical field of aero-engine flow guide tests. The technical problem that the test efficiency is low due to the fact that a cylinder body is prone to cracking in an existing flow guide test is solved. The exhaust flow guide method comprises the following steps: step 1, providing a plurality of exhaust devices at different positions and angles, and arranging the exhaust devices on the outer surface of a barrel in the circumferential direction of the barrel; step 2, fixing the cylinder body; 3, an engine thrust reverser is installed in the cylinder; the engine thrust reverser is mounted in the barrel through the front end part of the barrel; 4, during engine test run, air flow exhausted forwards by the engine thrust reverser is guided through the exhaust device and then exhausted backwards; the stress of the cylinder in the radial direction and the stress of the cylinder in the axial direction are released. The cylinder can be prevented from cracking, and the flow guide efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine flow diversion testing, and in particular to a reverse thrust exhaust flow diversion method for aero-engine reverse thrust testing. Background Art

[0002] Aircraft engine reverse thrust means that when a passenger plane lands, the hydraulic actuator moves the movable sleeve of the reverse thrust fairing backward, bringing up the baffle door, exposing the grille section, blocking the backward passage of the fan airflow and turning it to flow forward from the grille section, generating reverse thrust. Reverse thrust is used to reduce the speed of the aircraft after it touches the ground and shorten the taxiing distance.

[0003] The reverse thrust test of aircraft engines uses a reverse thrust exhaust guide device to simulate the reverse thrust process to verify the performance and safety of the engine.

[0004] The traditional reverse thrust exhaust guide device structure has the problems of large cylinder vibration and easy cracking of the cylinder due to the influence of the engine reverse thrust airflow, resulting in low efficiency of the guide test. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a reverse thrust exhaust diversion method for a reverse thrust test of an aircraft engine, so as to solve the technical problem of low test efficiency due to large cylinder vibration and easy cracking in the existing diversion test.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] The present invention provides a reverse thrust exhaust flow guiding method for a reverse thrust test of an aero-engine, the flow guiding method comprising the following steps:

[0008] Step 1, providing a plurality of exhaust devices at different positions and angles, and arranging the exhaust devices on the outer surface of the cylinder along the circumference of the cylinder;

[0009] Step 2, fixing the cylinder;

[0010] First, the two ends of the cylinder are fixed, and the fixing process includes: a pair of sliding support components are arranged on both sides of the front end of the cylinder and both sides of the rear end of the cylinder; during the test run, the cylinder can release deformation stress along its radial direction by using the sliding support components;

[0011] Then the bottom of the cylinder is fixed, and the fixing process includes: first fixing the front end of the cylinder so that its position remains unchanged relative to the ground; then, setting a positioning component at the tail of the cylinder. During the test run, the tail of the cylinder can slide along the central axis direction through the positioning component to release the deformation stress;

[0012] Step 3, installing the engine thrust reverser in the cylinder;

[0013] Install the engine thrust reverser in the cylinder through the front end of the cylinder;

[0014] Step 4: During the engine test run, the airflow discharged forward from the engine thrust reverser is guided through the exhaust device and then discharged backward; the stress of the cylinder in the radial direction and the stress in the axial direction are both released.

[0015] Furthermore, before step 2, the following steps are also included:

[0016] Provide two fixing structures, namely a first fixing structure and a second fixing structure, connect the first fixing structure to the ground embedded structure, and then set the second fixing structure on the first fixing structure;

[0017] The front end of the cylinder is slidably connected to the second fixed structure through a sliding support component, and then the rear end of the cylinder is slidably connected to the first fixed structure through a sliding support component.

[0018] Further, in step 2, for the front end of the cylinder, a double-hole upper support is first installed on both sides of the bottom of the cylinder, and then a pair of single-hole lower supports are arranged on the top of the second fixed structure, and the single-hole upper supports are connected to the corresponding double supports through a pin shaft and are both clearance-matched with the pin shaft;

[0019] During engine testing, the position of the single-hole lower support remains fixed, and the cylinder can slide outward along the pin axis through the double-hole upper support thereon to release the thermal deformation of the cylinder in the radial direction.

[0020] Furthermore, for the tail of the cylinder, a double-hole upper support is first installed at the bottom of the exhaust device on both sides of the cylinder, and then a pair of single-hole lower supports are arranged on the top of the first fixed structure, and the single-hole upper support is connected to the corresponding double support through a pin shaft and both are clearance-matched with the pin shaft;

[0021] During engine test, the position of the single-hole lower support remains fixed, and the cylinder can slide outward along the pin axis through the double-hole upper support on the exhaust device to release the thermal deformation of the cylinder in the radial direction.

[0022] Furthermore, in step 2, when the positioning component is used to make the tail of the cylinder slide along its central axis direction to release deformation stress, a T-shaped guide block is first set on the bottom surface of the tail of the cylinder, and then a sliding bracket along the central axis direction of the cylinder is set on the top of the first fixed structure. The cylinder uses the T-shaped guide block to slide along the sliding groove on the sliding bracket along the central axis direction of the cylinder to release axial stress.

[0023] Furthermore, in step 2, the first fixed structure and the ground embedded structure are arranged in an inclined contact mode;

[0024] By adjusting the contact area between the two, the height of the first fixing structure can be adjusted, and thus the height of the cylinder can be adjusted.

[0025] Furthermore, before step 1, the following steps are also included:

[0026] Adjust the curvature of the inner surface of the exhaust device to 2100R~2300R.

[0027] Furthermore, in step 3, when installing the engine reverse thrust device, the movable door on the front end of the cylinder is opened inward, and the tail of the engine is inserted into the engine mounting hole at the front end of the cylinder through upper transportation. After the engine is installed in place, the movable door is locked to the cylinder by a latch.

[0028] Furthermore, in step 4, after the reverse thrust device of the aircraft engine is turned on, a part of the airflow is ejected backward through the cylinder cavity and the tail of the cylinder; the other part of the airflow changes the jet direction from forward to backward after passing through the exhaust device, and the two airflows are ejected backward in parallel without interfering with each other.

[0029] The present invention also provides a reverse thrust exhaust flow guide device for a reverse thrust test of an aircraft engine, which is used to implement the reverse thrust exhaust flow guide method for a reverse thrust test of an aircraft engine. The reverse thrust exhaust flow guide device for a reverse thrust test of an aircraft engine comprises a support unit, an exhaust unit and a cylinder;

[0030] The support unit is used to support the cylinder, and the exhaust unit is arranged on the outer surface of the cylinder and is connected with the inner cavity of the cylinder; a cover plate with holes is arranged at the front end of the cylinder, and the inner cavity of the cylinder is used to install the engine reverse thrust device and its tail nozzle; the tail of the cylinder is open; the airflow discharged forward by the engine reverse thrust device is guided by the exhaust unit and then discharged backward;

[0031] The exhaust unit includes a plurality of exhaust devices.

[0032] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0033] (1) The present invention arranges a plurality of exhaust devices at different angles and positions on the outer surface of the cylinder, which can meet the reverse thrust test requirements of various models and improve the versatility and applicability of the test equipment.

[0034] (2) The present invention solves the problem of easy cracking of the cylinder by respectively arranging sliding support components at the front end and the rear end of the cylinder, thereby ensuring the stability and sustainability of the test equipment and improving the test efficiency.

[0035] (3) The invention welds the guide plate at the sharp corner of the inner surface of the exhaust device connected to the cylinder to ensure that no eddy current or reverse flow is generated during the reverse thrust test, thereby improving the test efficiency.

[0036] (4) By setting up a platform inside the cylinder for easy inspection and maintenance, the reliability and continuity of the test equipment are ensured, and the operating and maintenance costs are reduced.

[0037] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings are only for the purpose of illustrating specific embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0039] Figure 1 The structure of the reverse thrust exhaust guide device for the reverse thrust test of the aircraft engine of the present invention is schematically shown. Figure 1 ;

[0040] Figure 2 The structure of the reverse thrust exhaust guide device for the reverse thrust test of the aircraft engine of the present invention is schematically shown. Figure 2 ;

[0041] Figure 3 The structure of the front end of the cylinder is shown in Figure 1. Figure 1 ;

[0042] Figure 4 It is a structural schematic diagram of the sliding support device and the positioning component of the present invention;

[0043] Figure 5 It is a schematic diagram of the bottom fixing structure of the cylinder of the present invention;

[0044] Figure 6 It is a structural schematic diagram of the sliding support component of the present invention;

[0045] Figure 7 It is a schematic diagram of the flow chart of the diversion method of the present invention.

[0046] Reference numerals:

[0047] 1-cylinder; 2-first vertical support rod; 3-second vertical support rod; 4-first transverse support rod; 5-first fixed rod; 6-second fixed rod; 7-exhaust device; 8-movable door; 9-engine mounting hole; 10-sliding support component; 11-inclined reinforcement plate; 12-transverse reinforcement plate; 13-first lower exhaust device; 14-second lower exhaust device; 15-guide plate; 16-positioning component; 17-third transverse support rod; 18-arc support plate; 19-cylinder front end fixing frame; 20-cylinder rear end fixing frame; 21-sliding bracket; 22-T-shaped guide block; 23-fixed block; 24-third fixed rod; 25-fourth fixed rod; 26-double-hole upper support; 27-single-hole lower support; 28-pin shaft; 29-bearing. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0049] The present invention provides a reverse thrust exhaust flow guiding method for a reverse thrust test of an aero-engine, such as Figure 7 As shown, the diversion method includes the following steps:

[0050] Step 1, providing a plurality of exhaust devices at different positions and angles, and arranging the exhaust devices on the outer surface of the cylinder along the circumference of the cylinder;

[0051] Step 2, fixing the cylinder;

[0052] First, the two ends of the cylinder are fixed, and the fixing process includes: a pair of sliding support components are arranged on both sides of the front end of the cylinder and both sides of the rear end of the cylinder; during the test run, the cylinder can release deformation stress along its radial direction by using the sliding support components;

[0053] Then the bottom of the cylinder is fixed, and the fixing process includes: first fixing the front end of the cylinder so that its position remains unchanged relative to the ground; then, setting a positioning component at the tail of the cylinder. During the test run, the tail of the cylinder can slide along the central axis direction through the positioning component to release the deformation stress;

[0054] Step 3, installing the engine thrust reverser in the cylinder;

[0055] Install the engine thrust reverser in the cylinder through the front end of the cylinder;

[0056] Step 4: During the engine test run, the airflow discharged forward from the engine thrust reverser is guided through the exhaust device and then discharged backward; the stress of the cylinder in the radial direction and the stress in the axial direction are both released.

[0057] The above step 1 also includes the following steps: adjusting the curvature of the inner curved surface of the exhaust device to 2100R-2300R. Specifically, the interior of the cylinder 1 and the inner wall surface of the exhaust device 7, especially the welding point between the two, adopt a smooth and fluent design and welding process to reduce airflow resistance and blockage; through fluid simulation calculation, the curvature of the inner curved surface of the exhaust device is adjusted to 2100R-2300R.

[0058] In the above step 1, the number of exhaust devices 7 is four, namely the first upper exhaust device 7 and the second upper exhaust device 7 and the first lower exhaust device 13 and the second lower exhaust device 14; wherein the first lower exhaust device 13 and the second lower exhaust device 14 are symmetrically arranged about a vertical plane passing through the central axis of the cylinder 1; the first upper exhaust device 7 is located above the first lower exhaust device 13, and the second upper exhaust device 7 is located above the second lower exhaust device 14.

[0059] In the above step 1, the installation position and exhaust angle of each exhaust device 7 of the present invention are different, so as to adapt to the reverse thrust angle requirements of engines of different models.

[0060] In the above step 1, the exhaust device 7 is connected to the inner cavity of the barrel 1 through its connecting port, and after the exhaust device 7 changes the direction of the forward airflow discharged from the engine reverse thrust device, the airflow is discharged backward through the guide port of the exhaust device 7.

[0061] The above step 2 also includes the following steps:

[0062] Two fixed structures are provided, namely a first fixed structure and a second fixed structure. The first fixed structure is connected to the ground embedded structure, and then the second fixed structure is arranged on the first fixed structure; the front end of the cylinder is slidably connected to the second fixed structure through a sliding support component, and then the rear end of the cylinder is slidably connected to the first fixed structure through a sliding support component.

[0063] In the above step 2, the sliding support component 10 includes a double-hole upper support 26, a single-hole lower support 27 and a pin 28; the pin 28 is arranged along the radial direction of the cylinder 1; the double-hole upper support 26 and the single-hole lower support 27 are aligned and connected by the pin 28; the double-single-hole upper support and the single-hole lower support 27 are clearance-fitted with the pin 28; the double-hole upper support 26 can slide along the pin 28.

[0064] In step 2, for the front end of the cylinder, a double-hole upper support is first installed on both sides of the bottom of the cylinder, and then a pair of single-hole lower supports are set on the top of the second fixed structure. The single-hole upper support and the corresponding double supports are connected by a pin shaft and the clearance between the single-hole upper support and the pin shaft is matched; when the engine is tested, the position of the single-hole lower support remains fixed, and the cylinder can slide outward along the pin shaft through the double-hole upper support thereon to release the thermal deformation of the cylinder in the radial direction.

[0065] For the tail of the cylinder, a double-hole upper support is first installed at the bottom of the exhaust device on both sides of the cylinder, and then a pair of single-hole lower supports are arranged on the top of the first fixed structure. The single-hole upper support and the corresponding double support are connected by a pin shaft and the clearance between the pin shafts is matched; when the engine is tested, the position of the single-hole lower support remains fixed, and the cylinder can slide outward along the pin shaft through the double-hole upper support on the exhaust device to release the thermal deformation of the cylinder in the radial direction.

[0066] In the above step 2, when the positioning component is used to make the tail of the cylinder slide along its central axis to release deformation stress, a T-shaped guide block is first set on the bottom surface of the tail of the cylinder, and then a sliding bracket along the central axis of the cylinder is set on the top of the first fixed structure. The cylinder uses the T-shaped guide block to slide along the slide groove on the sliding bracket along the central axis of the cylinder to release axial stress.

[0067] In the above step 2, an arc-shaped support plate 18 is provided at the bottom of the cylinder 1, which is in the shape of the bottom of the cylinder 1 and is arranged along the axial direction of the cylinder 1; the front end of the cylinder 1 is fixedly connected to the second fixed structure through the arc-shaped support plate 18, and the tail of the cylinder 1 is slidably connected to the second fixed structure through the arc-shaped support structure and the positioning component 16. The positioning component 16 can fix the cylinder 1 and guide the cylinder 1 to release deformation along the central axis of the cylinder 1.

[0068] In the above step 2, the positioning component 16 includes a sliding bracket 21 and a T-shaped guide block 22; the sliding bracket 21 is provided with a slide groove, and the direction of the slide groove is the same as the direction of the central axis of the cylinder 1; the T-shaped guide block 22 is fixedly connected to the arc-shaped support structure through the fixed block 23 at its top, and its bottom can slide in the slide groove.

[0069] In the above step 2, during the test run, the position of the front end of the cylinder 1 is fixed, and the T-shaped guide block 22 at the tail of the cylinder 1 is clearance-matched with the sliding bracket 21; the T-shaped guide block 22 slides along the central axis of the cylinder 1 in the slide groove of the sliding bracket 21 to ensure that the central axis of the cylinder 1 is always located on the central axis before its deformation.

[0070] In the above step 2, the first fixed structure and the ground embedded structure are set to be in an inclined contact mode; by adjusting the contact area between the two, the height of the first fixed structure can be adjusted and then the height of the cylinder can be adjusted.

[0071] In step 3, an engine mounting hole 9 is provided on the perforated cover plate at the front end of the cylinder 1. When the engine reverse thrust device is installed, the movable door 8 is pushed toward the inside of the cylinder 1, and the tail of the engine is inserted into the engine mounting hole 9 at the front end of the cylinder 1 through upper transportation. After the engine is installed in place, the movable door 8 is locked with the cylinder 1 by a latch.

[0072] In the above step 4, after the aircraft engine thrust reverser is turned on, a part of the airflow is ejected backward through the cylinder cavity and the cylinder tail; the other part of the airflow changes the jet direction from forward to backward after passing through the exhaust device, and the two airflows are ejected backward in parallel without interfering with each other.

[0073] Specifically, when the reverse thrust device of the aircraft engine is turned on, most of the airflow is discharged forward through the reverse thrust device, and the remaining part of the airflow is discharged backward from its tail nozzle. Therefore, a reverse thrust exhaust guide device is required to discharge the forward and backward airflows at the same time; wherein, the forward airflow is guided to be discharged backward through the exhaust device 7 of the reverse thrust exhaust guide device, and the exhaust device 7 cooperates closely with the engine reverse thrust device installed in the cylinder 1 to reduce the generation of airflow vortices; the backward airflow is directly discharged backward through the tail of the cylinder 1 through the reverse thrust exhaust guide device, and the two airflows are parallel and do not interfere with each other.

[0074] In summary, the present invention sets a plurality of exhaust devices 7 with different angles and positions on the outer surface of the cylinder 1, which can meet the reverse thrust test requirements of various models and improve the versatility and applicability of the test equipment. In addition, the present invention solves the problem of easy cracking of the cylinder 1 by setting sliding support components 10 at the front end of the cylinder 1 and the tail of the cylinder 1, thereby ensuring the stability and sustainability of the test equipment. Furthermore, the present invention welds the guide plate 15 at the sharp corner of the inner surface of the exhaust device 7 connected to the cylinder 1 to ensure that no eddy currents and backflows are generated during the reverse thrust test, thereby improving the test efficiency. Finally, through a platform that is easy to inspect and maintain, the reliability and sustainability of the test equipment are guaranteed, and the operating cost and maintenance cost are reduced.

[0075] The present invention also provides a reverse thrust exhaust flow guide device for a reverse thrust test of an aero-engine, which is used to implement the above-mentioned flow guide method, such as Figures 1 to 6 As shown, the exhaust guide device includes a support unit, an exhaust unit and a barrel 1; wherein, the support unit is used to support the barrel 1, and the exhaust unit is arranged on the outer surface of the barrel 1 and is connected with the inner cavity of the barrel 1; a cover plate with holes is provided at the front end of the barrel 1, and the cavity in the barrel 1 is used to install the engine reverse thrust device and its tail nozzle; the tail of the barrel 1 is a cavity; the airflow discharged forward by the engine reverse thrust device is guided by the exhaust unit and then discharged backward; wherein, the exhaust unit includes a plurality of exhaust devices 7; the plurality of exhaust devices 7 are distributed on the outer surface of the barrel 1 along the circumferential direction of the barrel 1.

[0076] Specifically, the barrel 1 of the present invention is a hollow thin-walled cylindrical structure, which is a variable diameter barrel 1, the diameter of the front end of the barrel 1 is smaller than the diameter of the rear end of the barrel 1, and the axis of the barrel 1 is arranged in the horizontal direction; the front end of the barrel 1 is a cover plate with holes, and the inner cavity of the barrel 1 is used to insert the engine reverse thrust device and its tail nozzle; the rear end of the barrel 1 is in an open state, which is used to discharge part of the airflow generated by the engine; the number of exhaust devices 7 of the present invention is multiple, for example, four, respectively, including the first upper exhaust device 7 and the second upper exhaust device 7 and the first lower exhaust device 13 and the second lower exhaust device 14; wherein the first lower exhaust device 13 and the second lower exhaust device 14 are symmetrically arranged about the vertical plane passing through the central axis of the barrel 1; the first upper exhaust device 7 is located above the first lower exhaust device 13, and the second upper exhaust device 7 is located above the second lower exhaust device 14.

[0077] It should be noted that the installation position and exhaust angle of each exhaust device 7 of the present invention are different to meet the reverse thrust angle requirements of different types of engines. In addition, the exhaust device 7 of the present invention is made of high temperature resistant and corrosion resistant materials to ensure long-term stable operation.

[0078] Compared with the prior art, the present invention provides a plurality of exhaust devices 7 with different exhaust angles and installation positions to adapt to the reverse thrust angles of various models, meet the test requirements of different engines, and ensure the versatility and flexibility of the test.

[0079] like Figure 1 and Figure 2 As shown, the exhaust device 7 is welded to the outer surface of the cylinder 1, and the exhaust device 7 includes a middle curved panel, a first side panel and a second side panel, wherein the first side panel and the second side panel are arranged on both side surfaces of the middle curved panel, and the cavity formed by the three has a connecting port and a guide port, wherein the connecting port is used to communicate with the inner cavity of the cylinder 1, and the opening direction of the guide port is the same as the opening direction of the tail of the cylinder 1, and the middle curved panel is used to change the direction of the forward airflow discharged from the engine reverse thrust device, and change the airflow direction from forward to backward, and then discharge it through the guide port.

[0080] It should be noted that the interior of the cylinder 1 and the inner wall surface of the exhaust device 7 of the present invention, especially the welding point between the two, adopt a smooth and fluent design and welding process to reduce airflow resistance and blockage; through fluid simulation calculation, the curvature of the surface of the exhaust device 7 is adjusted to 2100R~2300R.

[0081] It should be emphasized that if Figure 2 As shown, a guide plate 15 is welded at the sharp corner where the inner surface of the exhaust device 7 of the present invention connects with the cylinder 1. The guide plate 15 is used to ensure that no eddy current or reverse flow is generated during the reverse thrust test, thereby improving the test efficiency.

[0082] The internal profile of the conventional reverse thrust exhaust guide device is irregular, the connection between the exhaust device 7 and the guide device body is not smooth and continuous, and it cannot be adapted to aircraft engines with multi-angle reverse thrust devices. Compared with the prior art, the reverse thrust exhaust guide device of the present invention can evenly distribute multiple exhaust devices 7 along the center line, and use guide plates 15 for smooth transition between the exhaust devices 7 to reduce gas vortex; by arranging guide plates 15 at places where vortexes are easily generated in the exhaust device 7, the gas vortex phenomenon is further reduced and the vibration of the guide device is reduced.

[0083] In order to ensure the structural strength of the exhaust device 7, the four exhaust devices 7 of the present invention are provided with supporting ribs inside and outside. Specifically, supporting ribs are provided on the inner and outer sides of the first side plate and the outer side of the middle curved plate, and the supporting ribs are used to enhance the structural strength of the exhaust device 7.

[0084] In order to stably support the cylinder 1, Figure 1 and Figure 2 As shown, the support unit of the present invention includes a first fixed structure and a second fixed structure; the first fixed structure is installed on the ground embedded structure; the second fixed structure is arranged above the first fixed structure and the two are detachably connected, and the first fixed structure and the second fixed structure are used together to support the cylinder 1.

[0085] Specifically, the first fixed structure includes the first vertical support rod 2 to the fourth vertical support rod and the first transverse support rod 4 to the fourth transverse support rod; wherein, the first vertical support rod 2 to the fourth vertical support rod are arranged in parallel with each other, the first transverse support rod 4 to the fourth transverse support rod are arranged at the top of the first vertical support rod 2 to the fourth vertical support rod and both ends thereof are fixedly connected to the top of the corresponding vertical support rod, and the four vertical support rods and the four transverse support rods constitute a rectangular parallelepiped frame; wherein, the first vertical support rod 2 and the second vertical support rod 3 are located at the front end of the cylinder 1, and the third vertical support rod and the fourth vertical support rod are located at the tail end of the cylinder 1; the two ends of the first transverse support rod 4 are fixedly connected to the top of the first vertical support rod 2 and the second vertical support rod 3; the two ends of the third transverse support rod 17 are fixedly connected to the top of the third vertical support rod and the fourth vertical support rod. The second fixed structure is arranged above the first fixed structure and the two are detachably connected (for example, the two are connected by bolts) to facilitate modular installation; the first fixed structure and the second fixed structure are used together to support the cylinder 1.

[0086] In order to adjust the height of the first fixed structure, the first fixed bracket of the present invention is embedded in the ground with an inclined surface, and the two are fixed by bolts; by adjusting the contact area between the first fixed structure and the embedded ground, the position of the reverse thrust exhaust guide device can be fine-tuned to meet the engine insertion depth requirement.

[0087] Compared with the prior art, the present invention can ensure the fixing strength of the first fixed structure by installing the first fixed structure on the ground pre-buried structure. In addition, by adjusting the contact area between the first fixed structure and the ground pre-buried structure, the position of the reverse thrust exhaust guide device can be fine-tuned to meet the engine insertion depth requirement.

[0088] In order to further enhance the fixing strength of the first fixing structure, as Figure 1 and Figure 2 As shown, the first fixed structure of the present invention also includes four groups of reinforcement plates, which are respectively arranged between every two adjacent vertical support rods; each group of reinforcement plates includes upper and lower transverse reinforcement plates 12 and mutually intersecting inclined reinforcement plates 11, the two ends of the upper and lower transverse reinforcement plates 12 are fixedly connected to the two vertical support rods corresponding thereto and are arranged perpendicularly thereto, and the two mutually intersecting inclined reinforcement plates 11 are arranged between the upper and lower transverse reinforcement plates 12 and the ends thereof are fixedly connected to the two vertical support rods corresponding thereto.

[0089] Compared with the prior art, the present invention can increase the fixing strength of the first fixing structure and enhance the stability of the second fixing structure and the cylinder 1 by arranging four groups of reinforcing plates between adjacent vertical support rods.

[0090] In order to release the stress caused by the radial thermal expansion deformation of the cylinder 1 during the test run and ensure the stability of the cylinder 1, Figure 4 and Figure 6 As shown, the reverse thrust exhaust guide device for reverse thrust test of an aircraft engine of the present invention also includes a plurality of sliding support components 10; the front end of the cylinder 1 is slidingly connected to the second fixed structure through the sliding support component 10; the tail of the cylinder 1 is slidingly connected to the first fixed structure through the sliding support component 10; the sliding support component 10 is used to release the deformation in the radial direction of the cylinder 1 caused by thermal expansion during engine test; wherein, the sliding support component 10 includes a double-hole upper support 26, a single-hole lower support 27 and a pin 28; the double-hole upper support 26 and the single-hole lower support 27 are aligned and connected by the pin 28; the double-single-hole upper support and the single-hole lower support 27 are all clearance-fitted with the pin 28, and the double-hole upper support 26 can slide along the pin 28.

[0091] Specifically, the present invention provides a pair of sliding support components 10 at the front end and the rear end of the cylinder 1. For the pair of sliding support components 10 located at the front end of the cylinder 1, their single-hole lower supports 27 are fixed on the second fixed structure, and their double-hole upper supports 26 are fixed on the cylinder 1. The hole of the single-hole lower support 27 is located in the middle of the two holes of the double-hole upper support 26, and the two supports are connected by a pin shaft 28. It should be emphasized that bearings 29 are provided between the double-hole upper support 26 and the single-hole lower support 27 and the pin shaft 28, and they are all clearance fit therewith, and the pin shaft 28 is arranged along the radial direction of the cylinder 1; since the single-hole lower support 27 is fixed on the second fixed structure, the position of the single-hole lower support 27 is fixed; since the upper-hole upper support is fixed on the cylinder 1, during the test run, under the action of the stress generated by the thermal expansion and deformation of the cylinder 1, the double-hole upper support 26 on the cylinder 1 can slide along the pin shaft 28 (that is, slide along the radial direction of the cylinder 1), so as to effectively absorb and release the thermal expansion stress of the cylinder 1 to the surroundings, and prevent the cylinder 1 from cracking or being damaged.

[0092] For a pair of sliding support components 10 at the tail end of the cylinder 1, its single-hole lower support 27 is correspondingly fixed on the top of the third vertical support rod and the fourth vertical support rod, and its double-hole upper support 26 is respectively fixed on the bottom of the first lower exhaust device 13 and the second lower exhaust device 14. The hole of the single-hole lower support 27 is located in the middle of the two holes of the double-hole upper support 26, and the two supports are connected by a pin shaft 28. It should be emphasized that bearings 29 are provided between the double-hole upper support 26 and the single-hole lower support 27 and the pin shaft 28, and they are all clearance fit with each other, and the pin shaft 28 is arranged along the radial direction of the cylinder 1; since the single-hole lower support 27 is correspondingly fixed on the top of the third vertical support rod and the fourth vertical support rod, the positions of the two single-hole lower supports 27 are fixed; since the double-hole upper support 26 is fixed on the corresponding first lower exhaust device 13 and the second lower exhaust device 14, during the test run, under the action of the stress generated by the thermal expansion and deformation of the cylinder 1, the double-hole upper support 26 on the two exhaust devices 7 can slide along the pin shaft 28, so as to effectively absorb and release the thermal expansion stress of the cylinder 1 and the exhaust device 7 to the surroundings, and prevent the cylinder 1 and the two exhaust devices 7 from cracking or damage.

[0093] Compared with the prior art, the present invention provides a pair of sliding support components 10 at the front end and the tail end of the cylinder 1, respectively. On the one hand, the thermal expansion stress of the cylinder 1 can be effectively released, so that when the temperature of the cylinder 1 changes, the deformation generated can be released instead of being restricted, thereby preventing the cylinder 1 and the exhaust device 7 from cracking or breaking; on the other hand, the sliding support component 10 at the front end of the cylinder 1 is located between the cylinder 1 and the second fixed structure, which also plays a role of stable support; similarly, since the first lower exhaust device 13 and the second lower exhaust device 14 are partially located below the cylinder 1, the pair of sliding support components 10 at the tail end of the cylinder 1 are provided between the two exhaust devices 7 and the tops of the corresponding third vertical support rods and fourth vertical support rods, which also play a role of stable support for the exhaust device 7 and the cylinder 1. Therefore, the two pairs of sliding support components 10 of the present invention can improve the stability and reliability of the cylinder 1 and the exhaust device 7.

[0094] In order to more firmly fix the cylinder 1, the second fixing structure of the present invention includes a front end fixing structure of the cylinder 1; the front end fixing structure of the cylinder 1 includes a first fixing rod 5 and a second fixing rod 6 of the same structure and parallel to each other; a pair of mutually symmetrical first fixing seats are provided on both side surfaces of the outer surface of the front end of the cylinder 1; the bottom of the first fixing seat is fixedly connected to the top of the corresponding double-hole upper support 26, and the top of the first fixing rod 5 and the second fixing rod 6 is fixedly connected to the bottom of the corresponding single-hole lower support 27.

[0095] Specifically, the first fixing rod 5 is arranged at the top of the first vertical support rod 2 and the two are arranged in the same direction, the second fixing rod 6 is arranged at the top of the second vertical support rod 3 and the two are arranged in the same direction, and the tops of the first fixing rod 5 and the second fixing rod 6 are both provided with a single-hole lower support 27; correspondingly, a first fixing seat is provided on both outer sides of the front end of the cylinder body 1, and a double-hole upper support 26 is installed on the fixing seat; after the double-hole upper support 26 is aligned with the single-hole lower support 27, the two are connected by a pin shaft 28.

[0096] It should be emphasized that the single-hole lower support 27 at the top of the first fixing rod 5 and the second fixing rod 6 remains in the same position relative to the first fixing structure. During the test run, due to the thermal expansion and deformation of the cylinder 1, the double-hole upper support 26 fixed on the first fixing seat can slide along the pin shaft 28.

[0097] It should be pointed out that the cylinder 1 of the present invention is a variable diameter cylinder 1; the diameter of the front end of the cylinder 1 is smaller than the diameter of the rear end of the cylinder 1; among the multiple exhaust devices 7, the exhaust device 7 located on the outer surface of the cylinder 1 and close to the bottom of the cylinder 1 is the first lower exhaust device 13 and the second lower exhaust device 14, and the first lower exhaust device 13 and the second lower exhaust device 14 are symmetrically arranged about the vertical plane passing through the central axis of the cylinder 1; the bottom of the first lower exhaust device 13 and the second lower exhaust device 14 are both provided with a second fixed seat; the bottom of the second fixed seat is connected to the top of the first fixed structure through a sliding support component 10.

[0098] Specifically, the single-hole lower support 27 in the sliding support component 10 is respectively fixed on the top of the third vertical support rod and the fourth vertical support rod, that is, the top of the third vertical support rod and the fourth vertical support rod is fixedly connected to the bottom of the single-hole lower support 27; during the test run, the position of the single-hole lower support 27 remains unchanged; the double-hole upper support 26 is fixed on the second fixed seat at the bottom of the first lower exhaust device 13 and the second lower exhaust device 14, that is, the top of the double-hole upper support 26 is fixedly connected to the bottom of the second fixed seat, and the double single-hole upper support is connected to the single-hole lower support 27 by a pin shaft 28 and both of them are clearance fit with the pin shaft 28; during the test run, due to the thermal expansion and deformation of the cylinder 1 and the exhaust device 7, the double-hole upper support 26 can slide along the pin shaft 28, so that the cylinder 1 can release thermal deformation to the surroundings along its radial direction.

[0099] Compared with the prior art, the present invention can realize the fixed connection between the cylinder 1 and the sliding support component 10 by setting two first fixed seats; and can realize the fixed connection between the two exhaust devices 7 at the bottom of the cylinder 1 and the sliding support component 10 by setting the second fixed seat, thereby ensuring that the radial stress of the cylinder 1 can be released to the surroundings when it is thermally expanded and deformed, thereby ultimately avoiding cracking of the cylinder 1.

[0100] In order to release the stress in the axial direction of the cylinder 1 when it is deformed, Figure 5 As shown, the reverse thrust exhaust guide device for reverse thrust test of an aircraft engine of the present invention further includes a positioning component 16 and an arc-shaped support plate 18; the arc-shaped support plate 18 is arranged at the bottom of the cylinder 1 and conforms to the bottom of the cylinder 1; the arc-shaped support plate 18 is arranged along the axial direction of the cylinder 1 and is fixedly connected to the bottom of the cylinder 1; the length of the arc-shaped support plate 18 is equal to the length of the cylinder 1; the positioning component 16 is arranged at the bottom of the arc-shaped support plate 18 at the tail of the cylinder 1; the front end of the cylinder 1 is fixedly connected to the second fixed structure through the arc-shaped support plate 18; the tail of the cylinder 1 is slidably connected to the second fixed structure through the arc-shaped support plate 18 and the positioning component 16.

[0101] Compared with the prior art, the present invention fixedly connects the front end of the cylinder 1 to the second fixed structure (i.e., the position of the front end of the cylinder 1 remains fixed), and slidably connects the rear end of the cylinder 1 to the positioning component 16 (i.e., the rear end of the cylinder 1 can slide along the axis of the cylinder 1). When the cylinder 1 is thermally expanded and deformed, the positioning component 16 slides along the axial direction of the cylinder 1 to release the stress generated by the thermal expansion and deformation of the cylinder 1 during the test run, thereby solving the problem of easy cracking of the cylinder 1.

[0102] In order to support the cylinder 1 more stably, the second fixing structure of the present invention also includes a bottom fixing structure of the cylinder 1, and the bottom fixing structure of the cylinder 1 includes a cylinder front end fixing frame 19 and a cylinder tail fixing frame 20, wherein the cylinder front end fixing frame 19 is arranged on the first transverse support rod 4, and the cylinder front end fixing frame 19 includes a third fixing rod 24, a fourth fixing rod 25, a cross beam, and a first diagonal brace rod and a second diagonal brace rod; wherein the third fixing rod 24 and the fourth fixing rod 25 are arranged in parallel, and the bottoms of both are fixed on the first transverse support rod 4, and the tops thereof are fixedly connected to the arc support plate 18, and the cross beam is arranged between the third fixing rod 24 and the fourth fixing rod 25, the first diagonal brace rod is arranged on one side of the third fixing rod 24 and is fixedly connected to the third fixing rod 24 and one end of the cross beam, the second diagonal brace rod is arranged on one side of the fourth fixing rod 25 and is fixedly connected to the other end of the fourth fixing rod 25 and the cross beam, and the first diagonal brace rod, the second diagonal brace rod and the cross beam are all used to fix and support the third fixing rod 24 and the fourth fixing rod 25, thereby ensuring the supporting strength of the front end of the cylinder 1. The above-mentioned cylinder tail fixing frame 20 includes a fifth fixing rod and a third diagonal support rod and a fourth diagonal support rod, wherein the bottom end of the fifth fixing rod is fixed on the third transverse support rod 17, and the top thereof is fixedly connected to the arc-shaped support plate 18 of the cylinder 1 through a positioning component 16; the third diagonal support rod and the fourth diagonal support rod are respectively arranged on the two side surfaces of the fifth fixing rod, and both are used together to support the fifth fixing rod.

[0103] In order to fix the cylinder 1 and guide the cylinder 1 to release deformation along the central axis of the cylinder 1, the positioning component 16 of the present invention includes a sliding bracket 21 and a T-shaped guide block 22, wherein the sliding bracket 21 is provided with a slide groove, and the setting direction of the slide groove is the same as the axial direction of the cylinder 1; the T-shaped guide block 22 includes an integrally formed horizontal portion and a vertical portion, wherein the horizontal portion is fixedly connected to the arc-shaped support structure through a fixed block 23 at its top, and the vertical portion is embedded in the slide groove and can slide in the slide groove.

[0104] Compared with the prior art, the present invention fixedly connects the front end of the cylinder 1 to the front end fixing frame 19 of the cylinder (for example, bolted connection), and slidingly connects the rear end of the cylinder 1 to the rear end fixing frame 20 of the cylinder through the positioning component 16. The T-shaped guide block 22 at the rear end of the cylinder 1 is clearance-matched with the sliding bracket 21. When the cylinder 1 is deformed, the T-shaped guide block 22 slides in the slide groove of the sliding bracket 21 along the central axis of the cylinder 1, thereby guiding and positioning the cylinder 1, ensuring that the central axis of the cylinder 1 is always located on its central axis before deformation.

[0105] The above-mentioned reverse thrust exhaust guide device for reverse thrust testing of an aircraft engine also includes a movable door 8; the movable door 8 is arranged on a perforated cover plate at the front end of the cylinder 1, and the movable door 8 opens toward the inside of the cylinder 1. The movable door 8 can be locked with the cylinder 1 by a latch, and the setting of the movable door 8 does not affect the external space of the cylinder 1. The movable door 8 is arranged to facilitate the disassembly, assembly and maintenance of the engine.

[0106] It should be noted that an engine mounting hole 9 is also provided on the perforated cover plate at the front end of the cylinder 1. When the engine is installed, the movable door 8 is opened inward, and the tail of the engine is inserted into the engine mounting hole 9 at the front end of the cylinder 1 through upper transportation. After the engine is installed in place, the movable door 8 is locked with the cylinder 1 by a latch.

[0107] Compared with the prior art, the present invention provides a pair of sliding support components 10 at the front end of the cylinder 1 and a pair of sliding support components 10 at the bottom of the exhaust device 7 at the rear end of the cylinder 1, which can be used to release the stress generated in the radial direction by the thermal expansion and deformation of the cylinder 1; by fixedly connecting the front end of the cylinder 1 with the front end fixing frame 19 of the cylinder, and slidingly connecting the rear end of the cylinder 1 with the rear end fixing frame 20 of the cylinder through the positioning component 16, when the cylinder 1 thermally expands, the front end of the cylinder 1 remains stationary, and the rear end of the cylinder 1 can slide along the slide groove along the central axis of the cylinder 1 to release the stress in the axial direction of the cylinder 1, thereby finally avoiding cracking of the cylinder 1 and ensuring the stability and sustainability of the test equipment.

[0108] In order to facilitate inspection and maintenance, the present invention sets an inspection platform inside the cylinder 1, which is located at the bottom of the cylinder 1, so that the staff can enter the cylinder 1 through the movable door 8 for inspection and maintenance; the design of the inspection platform does not affect the aerodynamic performance of the exhaust guide device, and at the same time can ensure the safety and convenience of the staff.

[0109] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A reverse thrust exhaust flow guiding method for a reverse thrust test of an aero-engine, characterized in that: The following steps are involved: Step 1, providing a plurality of exhaust devices at different positions and angles, and arranging the exhaust devices on the outer surface of the cylinder along the circumference of the cylinder; Step 2, fixing the cylinder; First, the two ends of the cylinder are fixed, and the fixing process includes: a pair of sliding support components are arranged on both sides of the front end of the cylinder and both sides of the rear end of the cylinder; during the test run, the cylinder can release deformation stress along its radial direction by using the sliding support components; Then the bottom of the cylinder is fixed, and the fixing process includes: first fixing the front end of the cylinder so that its position remains unchanged relative to the ground; then, setting a positioning component at the tail of the cylinder. During the test run, the tail of the cylinder can slide along the central axis direction through the positioning component to release the deformation stress; Step 3, installing the engine thrust reverser in the cylinder; Installing the engine thrust reverser in the cylinder through the front end of the cylinder; Step 4: During the engine test run, the airflow discharged forward from the engine thrust reverser is guided through the exhaust device and then discharged backward; the stress of the cylinder in the radial direction and the stress in the axial direction are both released.

2. The reverse thrust exhaust flow guiding method for reverse thrust test of an aircraft engine according to claim 1, characterized in that: The step 2 also includes the following steps: Provide two fixing structures, namely a first fixing structure and a second fixing structure, connect the first fixing structure to the ground embedded structure, and then set the second fixing structure on the first fixing structure; The front end of the cylinder is slidably connected to the second fixed structure through a sliding support component, and then the rear end of the cylinder is slidably connected to the first fixed structure through a sliding support component.

3. The reverse thrust exhaust flow guiding method for reverse thrust test of an aircraft engine according to claim 2, characterized in that: In step 2, for the front end of the cylinder, a double-hole upper support is first installed on both sides of the bottom of the cylinder, and then a pair of single-hole lower supports are arranged on the top of the second fixed structure. The single-hole upper supports are connected to the corresponding double supports through a pin shaft and are both clearance-matched with the pin shaft; During engine testing, the position of the single-hole lower support remains fixed, and the cylinder can slide outward along the pin axis through the double-hole upper support thereon to release the thermal deformation of the cylinder in the radial direction.

4. The reverse thrust exhaust flow guiding method for reverse thrust test of an aircraft engine according to claim 3, characterized in that: In step 2, for the tail of the cylinder, a double-hole upper support is first installed at the bottom of the exhaust device on both sides of the cylinder, and then a pair of single-hole lower supports are arranged on the top of the first fixed structure, and the single-hole upper supports are connected to the corresponding double supports through a pin shaft and are both clearance-matched with the pin shaft; During engine test, the position of the single-hole lower support remains fixed, and the cylinder can slide outward along the pin axis through the double-hole upper support on the exhaust device to release the thermal deformation of the cylinder in the radial direction.

5. The reverse thrust exhaust flow guiding method for reverse thrust test of an aircraft engine according to claim 4, characterized in that: In step 2, when the positioning component is used to make the tail of the cylinder slide along its central axis to release deformation stress, a T-shaped guide block is first set on the bottom surface of the tail of the cylinder, and then a sliding bracket along the central axis of the cylinder is set on the top of the first fixed structure. The cylinder uses the T-shaped guide block to slide along the slide groove on the sliding bracket along the central axis of the cylinder to release axial stress.

6. The reverse thrust exhaust flow guiding method for a reverse thrust test of an aero-engine according to claim 1, characterized in that: In step 2, the first fixed structure and the ground embedded structure are arranged in an inclined contact mode; By adjusting the contact area between the two, the height of the first fixing structure can be adjusted, and thus the height of the cylinder can be adjusted.

7. The reverse thrust exhaust flow guiding method for a reverse thrust test of an aero-engine according to claim 1, characterized in that: The step 1 also includes the following steps: Adjust the curvature of the inner surface of the exhaust device to 2100R~2300R.

8. The reverse thrust exhaust flow guiding method for a reverse thrust test of an aero-engine according to claim 1, characterized in that: In step 3, when installing the engine thrust reverser, the movable door on the front end of the cylinder is opened inward, and the tail of the engine is inserted into the engine mounting hole at the front end of the cylinder through upper transportation. After the engine is installed in place, the movable door is locked to the cylinder by a latch.

9. The reverse thrust exhaust flow guiding method for a reverse thrust test of an aircraft engine according to claim 1, characterized in that: In step 4, after the reverse thrust device of the aircraft engine is turned on, a part of the airflow is ejected backward through the cylinder cavity and the tail of the cylinder; the other part of the airflow changes the jet direction from forward to backward after passing through the exhaust device, and the two airflows are ejected backward in parallel without interfering with each other.

10. A reverse thrust exhaust guide device for reverse thrust testing of an aircraft engine, characterized in that: Used to implement the reverse thrust exhaust flow guiding method for reverse thrust test of an aircraft engine as described in any one of claims 1 to 9, the reverse thrust exhaust flow guiding device for reverse thrust test of an aircraft engine comprises a support unit, an exhaust unit and a cylinder; The support unit is used to support the cylinder, the exhaust unit is arranged on the outer surface of the cylinder and is connected with the inner cavity of the cylinder; the front end of the cylinder is provided with a cover plate with holes, and the inner cavity of the cylinder is used to install the engine reverse thrust device and its tail nozzle; the tail of the cylinder is open; the airflow discharged forward by the engine reverse thrust device is guided by the exhaust unit and then discharged backward; The exhaust unit includes a plurality of exhaust devices.

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