Guiding device supporting structure in high-temperature environment

Abstract

The invention provides a flow guide device supporting structure in a high-temperature environment, which is used for connecting a flow guide basin and a flow tube, and comprises a bracket connected with the flow tube; the support is connected with the flow guide basin, the support and the bracket are coaxially arranged, and the support and the bracket are connected through a sliding connection assembly. According to the supporting structure, load distribution can be evenly carried out in all directions by changing the force transmission path, local stress concentration is effectively avoided, stress can be better dispersed to the whole structure, the overall stability of the supporting structure of the flow guiding device is improved, and the service life of the flow guiding device is prolonged. And under the action of dynamic load, the device has relatively high structural damage and deformation resistance. Meanwhile, it can be guaranteed that the flow guide basin and the flow pipeline are located on the same axis through the center positioning type structure, deformation absorption of the flow guide basin and the flow pipeline made of different materials can be achieved, and synchronous and coordinated actuation of deformation between the flow guide basin and the flow pipeline can be achieved through the supporting structure.

Description

Technical Field

[0001] This invention relates to the technical field of air environment simulation test equipment for aero-engines, and specifically to a support structure for a flow guiding device under high temperature conditions. Background Technology

[0002] According to the requirements of GJB_241A-2010 "General Specification for High-Altitude Simulation of Aero-engine Turbojet and Turbofan Engines", all types of engines, including newly developed and improved models, must undergo high-altitude simulation tests for evaluation and certification. The forecourt deflector (deflector basin), as a key device for improving the quality of the incoming flow field and ensuring the temperature non-uniformity (≤1%), pressure non-uniformity (≤1%), and turbulence (≤±1%) of the flow measurement section or engine inlet, has a structural stability closely related to the flow quality.

[0003] Currently, the design and construction schemes for the guide basin support structures of airborne environmental simulation test equipment under construction or in use both domestically and internationally typically cover a temperature range of -70 to 350℃ (no support constraints are used below 200℃; otherwise, a three-point tie rod structure is employed for support constraints). However, as the incoming flow temperature further increases, the shortcomings of traditional support structures gradually become apparent: 1. Significant thermal stress and deformation. The different coefficients of thermal expansion of different materials (usually the guide basin is made of high-temperature alloy while its support material is only carbon steel) result in different degrees of expansion or contraction when the temperature changes drastically; 2. Constraint stress: The support device usually constrains the guide basin (fixing or restricting its movement). This constraint prevents the guide basin and support structure from freely deforming according to their respective expansion rates, thereby generating huge thermal stresses (tensile or compressive stresses) within them; 3. Structural deformation: Continuous thermal stress cycles may cause permanent deformation (creep) of the guide basin or support structure, destroying its precisely designed geometry. Even slight deformation of the guide basin can severely affect its guiding effect and aerodynamic performance. Summary of the Invention

[0004] In view of this, the present invention provides a support structure for a flow guide device under high temperature conditions, so as to solve the problem that existing flow guide device support structures are prone to structural deformation under high temperature and high pressure conditions, and ensure the smooth conduct of engine air environment simulation tests.

[0005] The present invention provides the following technical solution: a support structure for a flow guiding device under high temperature environment, used to connect a flow guiding basin and a flow pipe, comprising: a bracket connected to the flow pipe; a support frame connected to the flow guiding basin and coaxially arranged with the bracket, wherein the support frame and the bracket are connected by a sliding connection component.

[0006] Compared with the prior art, the beneficial effects that the at least one technical solution adopted by the present invention can achieve include at least the following: 1) Compared with the traditional force transmission method of the support structure, the support structure proposed in this invention breaks through the traditional simple straight line and planar support structure, and adopts complex geometric shapes such as curves and arc surfaces to change the force transmission path. The circular structure can distribute the load more evenly in all directions, effectively avoid local stress concentration, and better distribute the force to the entire structure, thereby improving the overall stability of the flow guiding device support structure. Under dynamic load, it has a strong ability to resist structural damage and deformation.

[0007] 2) Compared with traditional support structures, the present invention can ensure that the flow guide basin and the flow pipeline are on the same axis through the central positioning structure, and can also absorb the deformation of the flow guide basin and the flow pipeline made of different materials. Furthermore, the support structure can achieve synchronous and coordinated operation of the deformation between the two.

[0008] 3) Compared with other shapes and traditional large tie rod support structures, the flow basin support structure proposed in this invention can disperse and transmit the circumferential and radial airflow turbulence force of the internal pipeline through the bracket and support body, effectively avoiding stress concentration at a single connection point and greatly improving the reliability of the support structure against airflow impact. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is the general installation drawing of the support structure for the flow guiding device.

[0011] Figure 2 This is section view AA in the overall installation drawing of the flow guiding device support structure.

[0012] Figure 3 Sectional view BB in the overall installation drawing of the flow guiding device support structure.

[0013] Figure 4 This is the overall diagram of the support structure for the flow guiding device.

[0014] Figure 5 This is the overall drawing of the bracket supporting the flow guiding device.

[0015] The attached figures are labeled as follows: 1. Flow guide basin; 21. First guide support; 22. Second guide support; 23. Guide pillar; 3. Bracket; 4. Bracket; 5. Flow pipe; 51. Air seal cavity. Detailed Implementation The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] This high-temperature environment flow guiding device support structure is used to achieve a stable connection between the flow guiding basin 1 and the flow pipe 5, and at the same time adapt to the use requirements under high temperature, high speed and alternating heat load conditions. The core solution is to solve the problems of concentric positioning, relative displacement release and stress dispersion of flow guiding basin 1 and flow pipe 5 of different materials and diameters under extreme conditions.

[0018] like Figures 1 to 5 As shown, one end of the flow guide basin 1 is inserted into one end of the flow tube 5. In order to further improve the sealing of the connection and avoid air leakage from affecting the test accuracy, a circumferentially arranged air sealing cavity 51 is provided at this end of the flow tube 5. The air sealing cavity 51 extends continuously along the inner wall of the end of the flow tube 5 to form an annular sealing structure, which can effectively block the airflow movement at the gap between the flow guide basin 1 and the flow tube 5.

[0019] The core components of the support structure include bracket 4, support 3, and sliding connection assembly connecting the two. Bracket 4 is fixedly connected to flow pipe 5, and support 3 is fixedly connected to guide basin 1. Support 3 and bracket 4 are coaxially arranged to ensure that guide basin 1 and flow pipe 5 always keep their axes coincident, meeting the stringent requirements of coaxiality of airflow channel in engine high-altitude simulation test.

[0020] The bracket 4 comprises multiple bracket units, which are centrally symmetrically distributed. Adjacent bracket units are fastened together by bolts, and the multiple bracket units together form a complete annular bracket 4 structure. This segmented design reduces overall stress concentration during the processing (welding or casting) of the bracket 4, lowering the risk of deformation during long-term use. On the other hand, the annular "clamp" structure effectively releases the radial expansion displacement of the flow pipe 5, avoiding structural damage caused by thermal expansion and contraction of the pipe body.

[0021] The inner wall contour of bracket 4 is precisely matched with the cylindrical connector of flow pipe 5. During assembly, the bracket unit fits against the outer wall of flow pipe 5, and each bracket unit is connected in sequence by bolts, so that bracket 4 and flow pipe 5 form a stable overall connection, ensuring that loads such as airflow impact and structural self-weight can be effectively transmitted and dispersed through bracket 4.

[0022] Each bracket unit is fixedly equipped with a second guide support 22. The connection between the second guide support 22 and the bracket unit is reinforced by welding, and a reinforcing structure is added at the connection to ensure the connection strength of the second guide support 22 under axial and radial forces. Guide grooves are provided at corresponding positions of the bracket 4 and the second guide support 22. The extension direction of the guide grooves is parallel to the axis of the bracket 4, providing a stable sliding guide path for the sliding connection assembly.

[0023] The support 3 includes multiple support units, each of which is also centrally symmetrically distributed. Adjacent support units are fastened together by bolts. Multiple support units together form a complete ring support 3 structure. Its segmented design logic is consistent with that of the bracket 4, which is convenient for processing and assembly, and can absorb the radial expansion displacement of the guide basin 1 through the ring structure.

[0024] The inner wall contour of the bracket 3 is precisely matched with the cylindrical nozzle shape of the guide basin 1. During assembly, the bracket unit is attached to the outer wall of the guide basin 1, and each bracket unit is connected in sequence by bolts, so that the bracket 3 and the guide basin 1 form a stable overall connection, ensuring the structural stability of the guide basin 1, while not affecting the aerodynamic performance of the guide basin 1 itself.

[0025] Each support unit is fixedly equipped with a first guide support 21, which consists of two spaced-apart reinforcing ribs. The two reinforcing ribs are parallel and symmetrically distributed, and their spacing is adapted to the diameter of the guide pillar 23. The reinforcing ribs are connected to the support unit by welding, and the length direction of the reinforcing ribs is parallel to the axis of the support 3, ensuring that the first guide support 21 can provide stable support force.

[0026] The sliding connection assembly includes a first guide support 21, a second guide support 22, and a guide column 23. The guide column 23 is fixedly disposed between two spaced reinforcing ribs of the first guide support 21. Both ends of the guide column 23 are welded and fixed to the two reinforcing ribs respectively to form a stable cantilever support structure. The axis of the guide column 23 is parallel to the axis of the bracket 3.

[0027] During assembly, the bracket 3 and the support 4 are aligned coaxially, and the guide pillar 23 on the first guide support 21 is inserted into the guide groove of the second guide support 22, achieving a sliding fit connection between the guide pillar 23 and the guide groove. A reasonable fit clearance is reserved between the outer wall of the guide pillar 23 and the inner wall of the guide groove. This clearance ensures that the guide pillar 23 can slide smoothly in the guide groove and restricts the radial relative displacement between the bracket 3 and the support 4, thereby ensuring the coaxiality of the flow basin 1 and the flow pipe 5.

[0028] Through the sliding engagement of the guide pillar 23 and the guide groove, the relative displacement between the bracket 3 and the support 4 along the axial direction can be achieved, effectively releasing the relative axial displacement between the guide basin 1 and the flow pipe 5 caused by factors such as the difference in the thermal expansion coefficient of the materials and temperature changes, avoiding the generation of huge thermal stress (tensile stress or compressive stress) between the two, thereby preventing permanent deformation (creep) of the guide basin 1 or the flow pipe 5, ensuring its precisely designed geometry, and ensuring that the guiding effect and aerodynamic performance are not affected.

[0029] It should be noted that the support structure 3 and its matching fasteners and reinforcing ribs are all made of the same material as the flow guide basin 1, and the bracket structure 4 and its matching fasteners and reinforcing ribs are all made of the same material as the flow pipe 5. This ensures that the support 3 and the flow guide basin 1, and the bracket 4 and the flow pipe 5, have the same coefficient of thermal expansion, thereby reducing the additional stress caused by the difference in thermal expansion of the materials. The surface roughness Ra of all structural components is no greater than 12.5μm to avoid stress concentration and increased sliding resistance caused by surface roughness.

[0030] The parallelism deviation between the axis of the flow guiding device (including the flow guiding basin 1) and the flow pipe 5 connected downstream and the theoretical axis on site is no more than 0.5mm. During the assembly process, the flow guiding basin 1, the bracket 3, the support 4, and the flow pipe 5 are monitored and adjusted in real time by a laser alignment instrument to ensure that they are coaxially set.

[0031] After the flow guide basin 1, flow pipe 5, support 3, and bracket 4 are positioned, the fitting clearance between support 3 and bracket 4 must be strictly checked to ensure that support 3 can slide smoothly between bracket 4 without jamming. At the same time, the clearance should not be too large to avoid affecting the overall stability and coaxiality accuracy of the structure.

[0032] Overall assembly process: (1) Insert one end of the flow guide 1 into one end of the flow tube 5, and adjust the relative positions of the two to ensure that the air sealing cavity 51 fits well with the outer wall of the flow guide 1. (2) Attach each bracket unit to the outer wall of the flow pipe 5 and connect them with bolts to form a complete bracket 4. Tighten the bolts to the preset torque. (3) Attach each bracket unit to the outer wall of the flow basin 1 and connect them with bolts to form a complete bracket 3. Tighten the bolts to the preset torque. (4) Adjust the coaxial position of bracket 3 and bracket 4 so that guide post 23 is inserted into guide groove and check the smoothness of sliding of guide post 23; (5) Verify the coaxiality accuracy using a laser alignment instrument, check the tightness and gap size of each connection part, and complete the overall assembly after ensuring that the design requirements are met.

[0033] This embodiment, through the above-described structural design and assembly process, ensures that the support structure can guarantee the concentric positioning of the guide basin 1 and the flow pipe 5, and effectively release the radial and axial displacement between them. At the same time, through the ring structure and the distributed force transmission path, it avoids local stress concentration, greatly improving the stability and airflow impact resistance of the support structure under high temperature, high speed and alternating thermal load conditions, and ensuring the smooth conduct of high-altitude simulation tests of aero-engines.

[0034] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical features and technical solutions, and technical solutions in this invention can be freely combined and used.

Claims

1. A support structure for a flow guiding device under high temperature conditions, used to connect a flow guiding basin (1) and a flow pipe (5), characterized in that, include: Bracket (4) is connected to flow tube (5); The bracket (3) is connected to the flow basin (1) and is coaxially arranged with the bracket (4). The bracket (3) and the bracket (4) are connected by a sliding connection assembly.

2. The experimental apparatus according to claim 1, characterized in that, The sliding connection component includes: The first guide support (21) is set on the bracket (3), and the first guide support (21) is fixedly provided with a guide pillar (23). The second guide support (22) is set on the bracket (4), and the bracket (4) and the second guide support (22) are provided with guide grooves at corresponding positions. The guide support (23) is slidably connected to the guide groove.

3. The support structure for the flow guiding device under high temperature environment according to claim 2, characterized in that, The first guide support (21) is composed of two spaced reinforcing ribs, and the guide column (23) is located between the two spaced reinforcing ribs.

4. The support structure for the flow guiding device under high temperature environment according to claim 2, characterized in that, The support (3) includes multiple support units, which are centrally symmetrically distributed. Adjacent support units are connected by bolts, and the multiple support units together form the support (3).

5. The support structure for the flow guiding device under high temperature environment according to claim 4, characterized in that, Each support unit is equipped with a first guide support (21).

6. The support structure for the flow guiding device under high temperature environment according to claim 2, characterized in that, The bracket (4) includes multiple bracket units, which are centrally symmetrically distributed. Adjacent bracket units are connected by bolts, and the multiple bracket units together form the bracket (4).

7. The support structure for the flow guiding device under high temperature environment according to claim 6, characterized in that, Each bracket unit is equipped with a second guide support (22).

8. The support structure for the flow guiding device under high temperature environment according to claim 1, characterized in that, One end of the flow guide basin (1) is inserted through one end of the flow pipe (5), and one end of the flow pipe (5) is provided with a circumferentially arranged air-sealed cavity (51).

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