Flexible deformable force augmenting oil ring structure

Abstract

The application discloses a flexible and deformable force-adding oil delivery ring structure, which comprises an oil inlet pipe joint, a deformable pipe, a fuel oil spray rod and a fuel oil pipe, the deformable pipe and the fuel oil pipe are alternately connected to form a ring structure, the oil inlet pipe joint is communicated with the fuel oil pipe through a tee joint, the fuel oil spray rod is arranged on the fuel oil pipe, and an oil injection hole is arranged on the fuel oil spray rod. The corrugated pipe structure capable of absorbing circumferential thermal deformation is arranged on the fuel oil pipe of the oil delivery ring, the working stress caused by the sharp contraction deformation of the force-adding oil delivery ring at the moment of low-temperature fuel oil filling is improved, the cyclic thermal stress level of the force-adding oil delivery ring assembly under the engine power cycle condition is effectively reduced, the working condition of the component is improved, and the working reliability and service life of the component are improved.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine technology, and particularly relates to a flexible and deformable afterburner oil delivery ring structure. Background Technology

[0002] The fuel supply ring in the afterburner of an empty engine is exposed in the engine's internal flow channels. Under non-afterburning conditions, it mainly bears aerodynamic and thermal loads due to the impact and heating effect of high-temperature combustion gases. When the engine's afterburner is activated, low-temperature afterburning fuel (60℃~80℃) fills the fuel supply ring. At this time, due to the large temperature difference between the supplied fuel and the fuel supply ring components (700℃~800℃), the fuel supply ring components cool down rapidly under the transient heat exchange effect of the low-temperature fuel. This will cause the components to undergo rapid shrinkage deformation. At the same time, the external tie rods constrain the shrinkage deformation, leading to stress concentration (local stress >1000MPa). Under repeated cycles of thermal stress, this will cause crack propagation failure in the weak parts of the components.

[0003] Therefore, there is a need for an oil conveying ring structure that can reduce the cyclic thermal stress level of components, improve the working conditions of components, and enhance the reliability and service life of components. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a flexible and deformable force-assisted oil delivery ring structure.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a flexible and deformable fuel delivery ring structure, including a fuel inlet nozzle, a deformable tube, a fuel injector rod, and a fuel pipe. The deformable tube and the fuel pipe are alternately connected to form a ring structure. The fuel inlet nozzle is connected to the fuel pipe through a T-joint. The fuel injector rod is disposed on the fuel pipe and has a fuel injection hole.

[0007] Preferably, the deformable tube is a corrugated tube, and several corrugations are uniformly arranged on the deformable tube.

[0008] Preferably, the distance between two adjacent wave peaks is greater than the wave height of a single wave peak.

[0009] Preferably, the tip of the wave crest is rounded.

[0010] Preferably, the included angle of the wave crest is set to 30°~45°.

[0011] Preferably, the wave crest protrudes outward from the deformable tube.

[0012] Preferably, the deformable tube is provided with 12 to 16 segments distributed circumferentially.

[0013] Preferably, the deformable tube is made of metal rubber.

[0014] The beneficial effects of this invention are as follows: This invention improves the working stress generated by the rapid contraction deformation of the afterburner fuel delivery ring during low-temperature fuel filling by adding a corrugated pipe structure that can absorb circumferential thermal deformation to the fuel pipe of the afterburner fuel delivery ring. This effectively reduces the cyclic thermal stress level of the afterburner fuel delivery ring assembly under engine power cycle conditions, improves the working conditions of the component, and enhances the reliability and service life of the component. Attached Figure Description

[0015] Figure 1 This is an isometric view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the deformable tube of the present invention; Figure 4 This is a schematic diagram illustrating the working principle of the deformable tube of this invention; In the diagram: 1-Fuel pipe connector, 2-Deformable pipe, 21-Crest, 3-Fuel injector, 4-Fuel pipe, 5-Fuel swirl. Detailed Implementation

[0016] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0017] Example: like Figures 1 to 4 As shown, a flexible and deformable fuel delivery ring structure includes an inlet nozzle 1, a deformable tube 2, a fuel injector 3, and a fuel pipe 4. The deformable tube 2 and the fuel pipe 4 are alternately connected to form a ring structure. The inlet nozzle 1 is connected to the fuel pipe 4 through a tee connector. The fuel injector 3 is disposed on the fuel pipe 4 and has fuel injection holes.

[0018] The flexibility and structural strength of the deformable tube 2 can be balanced according to the specific working conditions of the component, with a focus on the thermal stress level and the requirement for absorbing the deformation of the oil conveying ring.

[0019] The deformable tube 2 is a corrugated tube, and several wave peaks 21 are evenly arranged on the deformable tube 2.

[0020] The distance between two adjacent wave crests 21 is greater than the wave height of a single wave crest 21.

[0021] The ends of the wave crest 21 are rounded.

[0022] The included angle of the crest 21 is set to 30°~45°.

[0023] Based on the actual situation, the relevant parameters of wave crest 21 can be set as follows: the spacing between adjacent waves is set to 20mm~30mm, the wave height is set to 10mm~20mm, and the wave crest radius is set to 5mm~15mm.

[0024] The wave crest 21 protrudes outward from the deformable tube 2.

[0025] The deformable tube 2 is arranged in 12 to 16 sections in a circumferential distribution.

[0026] The deformable tube 2 is made of nickel-titanium shape memory alloy metal rubber, whose superelasticity and high damping performance can effectively alleviate the large thermal stress caused by extreme temperature gradients and suppress forced vibration caused by high distortion and strong turbulence excitation.

[0027] The fuel supply ring structure is installed inside the combustion chamber of the aircraft engine. At the moment of fuel supply, the working fuel flows into the fuel supply ring structure from the fuel inlet pipe connector 1, and is split into two streams at the T-junction to supply the entire circumference. At different circumferential positions, the fuel is supplied into the combustion chamber through the fuel injection holes on the fuel injector rod 3 to form a uniform fuel-air mixture with the incoming flow.

[0028] By setting the deformable tube 2 of the corrugated pipe, the corrugated structure has the ability to absorb the deformation caused by the internal pressure thermal stress F in the circumferential direction. It can effectively absorb the internal pressure thermal stress F generated by the rapid contraction of the oil delivery ring structure under the cooling effect of low temperature fuel under the condition of huge temperature difference. It significantly reduces the large stress caused by thermal incoordination in the fixed installation part of the oil delivery ring structure, thereby reducing the damage to the oil delivery ring caused by working thermal stress during a single power supply switch.

[0029] When the fuel flowing through the inner cavity of the fuel delivery ring structure passes through the deformable tube 2, a fuel vortex 5 is generated at the crest 21. This increases the Reynolds number of the fuel flow and the heat transfer boundary, thereby rapidly reducing the temperature of the fuel delivery ring structure, decreasing the temperature gradient, and improving the thermal stress distribution of the fuel delivery ring structure. After multiple engine power cycles, the damage caused by cyclic thermal stress loads on the components can be reduced, improving the operational reliability and service life of the fuel delivery ring structure.

Claims

1. A flexible and deformable force-assisted oil delivery ring structure, characterized in that: It includes an inlet nozzle (1), a deformable tube (2), a fuel injector (3) and a fuel pipe (4). The deformable tube (2) and the fuel pipe (4) are alternately connected to form a ring structure. The inlet nozzle (1) is connected to the fuel pipe (4) through a tee connector. The fuel injector (3) is set on the fuel pipe (4) and has an injection hole.

2. The flexible and deformable reinforcement oil delivery ring structure as described in claim 1, characterized in that: The deformable tube (2) is a corrugated tube, and several corrugations (21) are uniformly arranged on the deformable tube (2).

3. The flexible and deformable reinforcement oil conveying ring structure as described in claim 2, characterized in that: The distance between two adjacent wave crests (21) is greater than the wave height of a single wave crest (21).

4. The flexible and deformable reinforcement oil delivery ring structure as described in claim 2, characterized in that: The ends of the wave crest (21) are rounded.

5. The flexible and deformable force-driven oil conveying ring structure as described in claim 2, characterized in that: The included angle of the crest (21) is set to 30°~45°.

6. The flexible and deformable reinforcement oil delivery ring structure as described in claim 2, characterized in that: The crest (21) protrudes outward from the deformable tube (2).

7. The flexible and deformable reinforcement oil delivery ring structure as described in claim 1, characterized in that: The deformable tube (2) is arranged in 12 to 16 sections in a circumferential distribution.

8. The flexible and deformable force-driven oil conveying ring structure as described in claim 1, characterized in that: The deformable tube (2) is made of metal rubber.

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