Flow straightener for improving the flow distribution in a combustion chamber

Abstract

The utility model discloses a combustion chamber airflow distribution improves with steady flow baffle belongs to combustion equipment technical field, including heat -proof outer sleeve, inner sleeve, steady flow mechanism and adjusting mechanism, and steady flow mechanism includes bearing ring rotatably arranged between steady flow board no.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment technology, and in particular to a flow stabilizing baffle for improving airflow distribution in a combustion chamber. Background Technology

[0002] In the field of thermal power engineering, such as the combustion chambers of aircraft engines, gas turbines, and high-performance internal combustion engines, the degree of mixing between fuel and air directly determines combustion efficiency, combustion stability, and the amount of pollutants generated. In order to achieve efficient and clean combustion, airflow organization devices are usually installed at the inlet of the combustion chamber to form a specific flow field that is conducive to fuel atomization and rapid mixing.

[0003] In the prior art, common airflow organization devices are mostly fixed-structure cyclones or porous baffles. These devices, through their specific blade angles or opening distribution, can transform the axial airflow entering the combustion chamber into a stable rotating airflow or a uniformly distributed jet under design conditions. The rotating flow field can generate a central recirculation zone, effectively entraining high-temperature flue gas to stabilize the flame and enhance the mixing of fuel and air. However, in actual operation, the working state of these power units is not constant and needs to be frequently switched between different operating conditions such as starting, acceleration, cruising, and deceleration. This leads to significant changes in the velocity and flow rate of the airflow entering the combustion chamber.

[0004] When the actual airflow velocity deviates from the design conditions, these fixed airflow organization devices will expose their inherent limitations. For example, when the airflow velocity is too high, it may lead to excessive swirling intensity, causing the flame to be overstretched or even blown off; when the airflow velocity is too low, it cannot generate sufficient swirling intensity to effectively organize mixing, resulting in incomplete combustion and reduced efficiency. In short, the airflow organization devices in the prior art are usually a passive structure. Once its geometry is determined, it can only perform optimally within a narrow range of operating conditions. It lacks the ability to adaptively adjust to different operating conditions and makes it difficult to maintain a uniform airflow distribution and ideal combustion effect throughout the entire working envelope.

[0005] Therefore, this utility model proposes a flow-stabilizing baffle for improving the airflow distribution in the combustion chamber to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems of the fixed structure of the flow stabilizing baffle for improving the airflow distribution in the combustion chamber in the prior art, which cannot adapt to the airflow changes under different operating conditions, resulting in uneven airflow distribution and low combustion efficiency, this utility model aims to provide a flow stabilizing baffle for improving the airflow distribution in the combustion chamber with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a flow stabilizing baffle for improving airflow distribution in a combustion chamber, including a heat-insulating outer sleeve, an inner sleeve, a flow stabilizing mechanism, a bearing ring, guide vanes, and an adjustment mechanism; the flow stabilizing mechanism includes a flow stabilizing plate one and a flow stabilizing plate two, and the adjustment mechanism includes a sliding ring, a turbulence column, a spiral cone, a hydraulic rod, and a connecting block.

[0008] The inner sleeve is coaxially located inside the heat-insulating outer sleeve. The first and second flow stabilizers are spaced apart along the airflow direction. The bearing ring is rotatably located between the first and second flow stabilizers, and the guide vanes are located on the bearing ring.

[0009] Furthermore, the sliding ring is equipped with a turbulence column and a spiral cone, and the hydraulic rod is combined by driving the sliding ring to slide axially along the airflow channel through the connecting block.

[0010] Preferably, the flow stabilizing baffle for improving the airflow distribution in the combustion chamber also includes a shroud and a guide ring. The shroud is located on the upstream side of the airflow of the bearing ring and is used to guide the airflow to the guide ring.

[0011] Preferably, the flow stabilizing baffle for improving the airflow distribution in the combustion chamber also includes a connecting shaft, which is used to reinforce the connection between the bearing ring and the guide vanes.

[0012] Preferably, the flow stabilizing baffle for improving the airflow distribution in the combustion chamber also includes a sealing ring, which surrounds the outer periphery of the first and second flow stabilizing baffles to enhance the sealing between the first and second flow stabilizing baffles and the inner wall of the heat insulation outer sleeve.

[0013] Preferably, the adjustment mechanism further includes a guide slider, which is disposed on the flow stabilizer plate and is used to guide the sliding of the sliding ring.

[0014] Preferably, the guide vanes are evenly distributed on the surface of the bearing ring.

[0015] Preferably, the turbulence columns are evenly distributed on the surface of the sliding ring.

[0016] Preferably, both the first flow stabilizer plate and the second flow stabilizer plate are provided with flow guide holes.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model, by setting guide vanes that can rotate due to airflow impact, drives the overall airflow to form a stable rotating flow pattern, which solves the problem of single flow field and poor mixing effect when airflow enters the combustion chamber in the prior art, and achieves the technical effect of enhancing the mixing uniformity of airflow and fuel, thereby improving combustion efficiency and flame stability.

[0019] 2. This utility model solves the problem that existing airflow distribution devices cannot actively adjust according to real-time flow velocity changes due to their fixed structure, resulting in poor adaptability to working conditions. By setting up a retractable turbulence column and a spiral cone driven by a hydraulic rod, it achieves the technical effect of dynamically adjusting local airflow resistance under different flow velocities, making the overall airflow distribution more uniform, thereby expanding the efficient working range of the device. Attached Figure Description

[0020] Figure 1 This is a perspective view of the flow stabilizing baffle for improving the airflow distribution in the combustion chamber proposed in this utility model;

[0021] Figure 2 This is a cross-sectional view of the heat-insulating outer sleeve of the flow-stabilizing baffle for improving the airflow distribution in the combustion chamber proposed in this utility model;

[0022] Figure 3 This is an exploded view of the flow stabilization mechanism of the flow stabilization baffle for improving the airflow distribution in the combustion chamber proposed in this utility model;

[0023] Figure 4 This is an exploded view of the adjustment mechanism of the flow stabilizing baffle for improving the airflow distribution in the combustion chamber proposed in this utility model.

[0024] Legend:

[0025] 1. Insulated outer sleeve; 2. Flow stabilizing mechanism; 201. Flow stabilizing plate one; 202. Flow stabilizing plate two; 203. Sealing ring; 204. Bearing ring; 205. Guide vane; 206. Connecting shaft; 207. Guide ring; 208. Radiator; 3. Adjusting mechanism; 301. Sliding ring; 302. Turbidator column; 303. Spiral cone; 304. Connecting block; 305. Hydraulic rod; 306. Guide block; 4. Inner sleeve. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] Example:

[0028] Please refer to Figures 1 to 4The flow stabilizing baffle for improving combustion chamber airflow distribution includes a cylindrical heat-insulating outer sleeve 1 as an integral mounting base, and an inner sleeve 4 coaxially fixedly connected inside the heat-insulating outer sleeve 1. An annular airflow channel is defined between the inner wall of the heat-insulating outer sleeve 1 and the outer wall of the inner sleeve 4 to guide high-pressure airflow through. A flow stabilizing mechanism 2 and an adjusting mechanism 3 are both integrated inside the airflow channel. The flow stabilizing mechanism 2 includes a first flow stabilizing plate 201 and a second flow stabilizing plate 202 spaced apart along the airflow direction. Both the first flow stabilizing plate 201 and the second flow stabilizing plate 202 are annular plate structures. The outer and inner circumferences of the first flow stabilizing plate 201 and the second flow stabilizing plate 202 are fixedly connected to the inner wall of the heat-insulating outer sleeve 1 and the outer wall of the inner sleeve 4, respectively. Multiple guide holes are provided on each of the 202. The flow stabilizing mechanism 2 also includes a bearing ring 204 rotatably disposed in the buffer cavity between the first flow stabilizing plate 201 and the second flow stabilizing plate 202. Multiple guide vanes 205 are fixedly connected at equal intervals on the bearing ring 204. The adjusting mechanism 3 includes a sliding ring 301 that can slide along the axial direction of the inner sleeve 4. Multiple turbulence columns 302 are uniformly fixedly connected to the outer circumferential surface of the sliding ring 301. A spiral cone 303 is fixedly connected to the end of the sliding ring 301. The adjusting mechanism 3 also includes a hydraulic rod 305 for providing driving force and a connecting block 304 for transmitting motion. One end of the hydraulic rod 305 is fixed to the first flow stabilizing plate 201. The telescopic end of the hydraulic rod 305 is connected to the sliding ring 301 through the connecting block 304.

[0029] Please refer to Figure 3 and Figure 4 In the flow stabilizing mechanism 2, the bearing ring 204 is rotatably mounted in the buffer cavity formed between the first flow stabilizing plate 201 and the second flow stabilizing plate 202. Multiple guide vanes 205 are equidistantly fixed to the outer circumferential surface of the bearing ring 204. The shunting cover 208 is fixedly connected to the inner sleeve 4 and is located upstream of the airflow of the bearing ring 204. The guide ring 207 is fixedly connected to the first flow stabilizing plate 201 and surrounds the inlet of the guide vanes 205. The shunting cover 208 is used to smoothly guide the airflow into the guide ring 207 and then impact the guide vanes 205. The connecting shaft 206 passes between the bearing ring 204 and the guide vanes 205 to strengthen the connection between the two. The flow stabilizing mechanism 2 also includes a sealing ring 203, which surrounds the outer circumference of the first flow stabilizing plate 201 and the second flow stabilizing plate 202 and fits against the inner wall of the heat insulation outer sleeve 1 to provide a seal.

[0030] In the adjustment mechanism 3, the sliding ring 301 is slidably sleeved on the outer wall of the inner sleeve 4 and located upstream of the airflow of the flow stabilizer plate 201. Multiple turbulence columns 302 are uniformly fixedly connected to the outer circumferential surface of the sliding ring 301. The spiral cone 303 is fixedly connected to the end face of the sliding ring 301 facing upstream of the airflow. The cylinder of the hydraulic rod 305 is fixed to the inner wall of the flow stabilizer plate 201. The telescopic rod end of the hydraulic rod 305 is fixedly connected to the sliding ring 301 through the connecting block 304, thereby driving the sliding ring 301 to slide back and forth along the axial direction of the inner sleeve 4. The adjustment mechanism 3 also includes a guide slider 306, which is fixed on the flow stabilizer plate 201 and slides in cooperation with the groove of the sliding ring 301 to provide guidance for the movement of the sliding ring 301.

[0031] In a preferred embodiment, in order to enable the high-pressure airflow to smoothly enter the area of ​​the guide vane 205 to form a stable rotating flow, the flow stabilizing mechanism 2 also includes a shroud 208 and a guide ring 207. The shroud 208 is fixedly connected to the inner sleeve 4 and faces the direction of the airflow, and has a streamlined outer surface. The guide ring 207 is fixedly connected to the flow stabilizing plate 201 and surrounds the inlet periphery of the guide vane 205. The shroud 208 smoothly gathers the airflow and guides it into the guide ring 207.

[0032] As a preferred embodiment, in order to enhance the structural strength and long-term operational reliability of the connection between the bearing ring 204 and the guide vane 205, the flow stabilizing mechanism 2 also includes a connecting shaft 206. The connecting shaft 206 passes between the hub of the bearing ring 204 and the root of the guide vane 205, rigidly connecting the two into one, preventing loosening under the impact of high-pressure airflow.

[0033] As a preferred embodiment, in order to prevent high-pressure airflow from leaking from the edge of the airflow channel, the flow stabilizing mechanism 2 also includes a sealing ring 203. The sealing ring 203 is embedded in the sealing groove on the outer periphery of the first flow stabilizing plate 201 and the second flow stabilizing plate 202, and elastically fits against the inner wall of the heat insulation outer sleeve 1. The sealing ring 203 is preferably a high-temperature resistant flexible graphite material.

[0034] As a preferred embodiment, in order to ensure the stability and guiding accuracy of the sliding ring 301 during reciprocating motion, the adjustment mechanism 3 also includes a guide slider 306. The guide slider 306 is fixed to the surface of the flow stabilizer 201 and slides in the guide groove opened on the sliding ring 301 to limit the circumferential rotation of the sliding ring 301 and ensure the extension posture of the turbulence column 302 and the spiral cone 303.

[0035] As a preferred arrangement, the guide vanes 205 are equidistantly distributed on the surface of the bearing ring 204. This arrangement helps to form a uniform and symmetrical rotating flow field. The turbulence columns 302 are evenly distributed on the surface of the sliding ring 301, which helps to produce a uniform obstruction and disturbance effect on the airflow when the regulating mechanism 3 is activated. In addition, both the first flow stabilizer 201 and the second flow stabilizer 202 are provided with guide holes. The diameter and arrangement of the guide holes have been optimized to achieve initial dispersion and secondary rectification of the airflow.

[0036] Working principle: When using the flow stabilizer, the high-pressure airflow enters through the opening on the right side of the heat-insulating outer sleeve 1, first passing through the guide hole on the flow stabilizer plate 201 on the right side of the outer wall of the inner sleeve 4. The guide hole on the flow stabilizer plate 201 allows the high-pressure airflow to pass through and initially changes its flow direction. Subsequently, the high-pressure airflow passes through the guide hole and enters the buffer cavity formed between the flow stabilizer plate 201 and the flow stabilizer plate 202. At this time, the rectifier 208 smoothly guides the high-pressure airflow into the guide ring 207, while the guide vanes 205 evenly distributed on the surface of the bearing ring 204 continuously guide the high-pressure airflow. Under impact, the connecting shaft 206 strengthens the connection between the bearing ring 204 and the guide vane 205. The sealing ring 203 enhances the sealing between the first flow stabilizer 201 and the second flow stabilizer 202 and the inner wall of the heat insulation outer sleeve 1, ensuring the stable operation of the flow stabilizing mechanism 2. The high-pressure airflow is guided by the guide vane 205 to form a specific rotating flow pattern. At this time, the rotating airflow flows out through the guide hole on the second flow stabilizer 202, so that the high-pressure airflow is evenly distributed in the combustion chamber, avoiding the airflow from concentrating in certain areas and enhancing the mixing and distribution effect of the airflow.

[0037] Furthermore, when the flow rate of the high-pressure airflow is uneven, the regulating mechanism 3 comes into play. When the airflow speed is too fast, the hydraulic rod 305 extends and pushes the connecting block 304 to slide to the right along the inner wall of the flow stabilizer 201. When the bearing ring 204 moves, it will drive the sliding ring 301 and the evenly distributed turbulence columns 302 on its surface to move to the right together. During the sliding process of the sliding ring 301, the guide block 306 provides guidance. During this process, the spiral cone 303 extends out from the inside of the flow stabilizer 201 and drives the spiral cone 303 at its right end to move. The spiral cone 303 extends on the surface of the flow stabilizer 201, increasing the obstruction and disturbance of the airflow, reducing the airflow speed, and making the airflow diffuse more evenly. When the airflow speed is too slow, the hydraulic rod 305 retracts and drives the turbulence columns 302 back into the inner wall of the flow stabilizer 201. At this time, the turbulence column shortens, reducing the obstruction of the airflow, guiding more airflow into the area, thereby improving the uniformity of the overall airflow distribution, promoting more complete mixing of fuel and air, and improving combustion efficiency.

Claims

1. A flow-stabilizing baffle for improving airflow distribution in the combustion chamber, comprising: Insulated outer sleeve (1); Inner sleeve (4), the inner sleeve (4) is coaxially disposed inside the heat insulation outer sleeve (1) and defines an airflow channel with the heat insulation outer sleeve (1); The flow stabilizing mechanism (2) includes a flow stabilizing plate one (201) and a flow stabilizing plate two (202) arranged sequentially in the airflow channel along the airflow direction; Its features are, The flow stabilizing mechanism (2) further includes a bearing ring (204) rotatably disposed between the first flow stabilizing plate (201) and the second flow stabilizing plate (202), and the bearing ring (204) is provided with guide vanes (205); The flow stabilizing baffle for improving the airflow distribution in the combustion chamber also includes an adjustment mechanism (3). The adjustment mechanism (3) includes a slidable sliding ring (301). The sliding ring (301) is provided with a turbulence column (302) and a spiral cone (303). The adjustment mechanism (3) also includes a hydraulic rod (305) and a connecting block (304). The hydraulic rod (305) drives the sliding ring (301) to slide along the axial direction of the airflow channel through the connecting block (304).

2. The flow-stabilizing baffle for improving airflow distribution in the combustion chamber according to claim 1, characterized in that, The flow stabilizing mechanism (2) further includes a shroud (208) and a guide ring (207). The shroud (208) is located on the upstream side of the airflow of the bearing ring (204), and the shroud (208) is used to guide the airflow to the guide ring (207).

3. The flow stabilizing baffle for improving airflow distribution in the combustion chamber according to claim 1, characterized in that, The flow stabilizing mechanism (2) also includes a connecting shaft (206), which is used to reinforce the connection between the bearing ring (204) and the guide vane (205).

4. The flow stabilizing baffle for improving airflow distribution in the combustion chamber according to claim 1, characterized in that, The flow stabilizing mechanism (2) also includes a sealing ring (203), which surrounds the outer periphery of the first flow stabilizing plate (201) and the second flow stabilizing plate (202) to enhance the sealing between the first flow stabilizing plate (201) and the second flow stabilizing plate (202) and the inner wall of the heat insulation outer sleeve (1).

5. The flow stabilizing baffle for improving airflow distribution in a combustion chamber according to claim 1, characterized in that, The adjustment mechanism (3) further includes a guide block (306), which is disposed on the flow stabilizer plate (201) and is used to guide the sliding of the sliding ring (301).

6. The flow-stabilizing baffle for improving airflow distribution in a combustion chamber according to claim 1, characterized in that, The guide vanes (205) are evenly distributed on the surface of the bearing ring (204).

7. The flow stabilizing baffle for improving airflow distribution in a combustion chamber according to claim 1, characterized in that, The turbulence columns (302) are evenly distributed on the surface of the sliding ring (301).

8. The flow stabilizing baffle for improving airflow distribution in a combustion chamber according to claim 1, characterized in that, Both the first flow stabilizer (201) and the second flow stabilizer (202) are provided with flow guide holes.

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