Front-end air inlet device for atomization experiment

Abstract

The invention relates to a front-end gas inlet device for an atomization experiment, and the device comprises an annular housing which is internally provided with an annular cavity and is used for accommodating and guiding gas to flow; the clamping plate is arranged in the annular cavity and divides the annular cavity into a buffer cavity and a circulation cavity, permeation holes are formed in the clamping plate, and gas circulation under high pressure is achieved; the multiple rotational flow path inlets are annularly distributed in the side wall of the annular shell at equal intervals and communicate with the circulation cavity; and the on-duty path inlet is positioned on one side of the cyclone inlet and is used for supplementing when the gas input quantity of the cyclone path inlet is insufficient, so that the gas input uniformity and saturation are ensured. The device is compact and reasonable in structure and convenient to operate, efficient buffering and uniform distribution of gas are achieved through the design of the annular shell and the clamping plate, the arrangement of the on-duty road inlet and the reasonable structural design, and the accuracy and reliability of an atomization experiment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of burners, in particular to a front-end air intake device for atomization experiments. Background Art

[0002] In recent years, with the continuous deepening of research on fuel combustion efficiency, the fuel nozzle, as the core component of the burner, its efficiency and atomization performance are crucial to improving combustion efficiency. Anti-clogging, anti-pollution, large flow range and excellent atomization performance are the characteristics that fuel nozzles must have to ensure that the burner can maintain stable and efficient performance under various complex working conditions. Atomization experiments, as an important means of evaluating the performance of fuel nozzles, aim to provide a scientific basis for optimizing fuel combustion efficiency by simulating the atomization effect under different working conditions.

[0003] However, in the actual operation of the atomization experiment, the design of the front-end air intake device becomes one of the key factors affecting the experimental results. The traditional front-end air intake device often leads to uneven distribution of gas entering the fuel nozzle due to structural limitations, especially the gas flow on the air intake side is significantly higher than other areas. This uneven gas distribution will directly affect the combustion effect of the nozzle, thereby reducing the accuracy and reliability of the atomization experiment.

[0004] Specifically, the traditional front-end air intake device usually sets the air intake on one side of the device. This layout makes the swirl path inlet near the air intake get more gas, while the side far from the air intake has insufficient gas flow. This uneven gas distribution will not only lead to uneven heat distribution during the combustion process, but also may cause combustion instability and even affect the complete combustion of fuel, thereby reducing combustion efficiency and generating more pollutants.

[0005] In addition, the lack of an effective gas uniform distribution mechanism is also a major defect of the traditional front-end air intake device. In the absence of auxiliary adjustment means such as the duty road entrance, once the gas flow at the air intake fluctuates, the gas distribution of the entire system will be affected, further exacerbating the instability and unevenness of the combustion process.

[0006] In summary, the traditional front-end air intake device has obvious deficiencies in gas distribution uniformity and cannot meet the requirements of atomization experiments for high precision and stability. Therefore, there is an urgent need for a front-end air intake device that can effectively improve gas distribution uniformity and improve fuel nozzle combustion efficiency to solve the problems existing in the current technology.

[0007] To this end, we propose a front-end air intake device for atomization experiments. Summary of the invention

[0008] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a front-end air intake device for atomization experiments. Through the annular shell and splint design, the duty road entrance setting and reasonable structural design, efficient buffering and uniform distribution of gas are achieved, thereby improving the accuracy and reliability of the atomization experiment.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A front-end air intake device for atomization experiments, comprising:

[0011] An annular shell having an annular cavity formed therein for containing and guiding the flow of gas;

[0012] A clamping plate is arranged in the annular cavity to divide the annular cavity into a buffer cavity and a flow cavity, and a penetration hole is arranged on the clamping plate to realize the flow of gas under high pressure;

[0013] The swirl path inlet is a plurality of annular inlets equidistantly distributed on the side wall of the annular shell and communicated with the flow chamber;

[0014] The duty road inlet is located on one side of the cyclone inlet and is used to supplement the gas input at the cyclone road inlet when the gas input is insufficient, so as to ensure the uniformity and saturation of the gas input.

[0015] As a further improvement of the above technical solution:

[0016] The annular shell is annular in shape, and a nozzle mounting hole is provided in the middle of the annular shell for docking with the nozzle.

[0017] The splint is an annular structure with an L-shaped cross section. Its vertical section is connected to the inner top wall of the annular cavity, its bottom surface is parallel to the bottom surface of the annular cavity, and the spacing between the bottom surface of the splint and the bottom surface of the annular cavity is 10%-50% of the height of the annular cavity, and the diameter of the splint is 5%-15% of the diameter of the annular cavity.

[0018] The penetration holes on the clamping plate are arranged in a ring-shaped manner and arranged in multiple rows along the radial direction. Each group of penetration holes includes a plurality of penetration holes that are evenly dispersed in a radial shape from the center to the outside.

[0019] It also includes an air inlet, which is arranged on the annular shell and docked with the buffer cavity for replenishing gas into the buffer cavity. The air inlet is a cylindrical inlet, and its position is located at the radial midpoint of the buffer cavity.

[0020] The air inlet has a nominal diameter of DN65 and a height of 40 mm, and is suitable for supplementing premixed gas to be burned.

[0021] The cross section of the flow cavity is L-shaped, including a horizontal section and a vertical section.

[0022] The number of the cyclone path inlets is greater than 4 and is evenly distributed on the same horizontal plane, ensuring that the gas can evenly enter the cyclone of the nozzle.

[0023] The shape of the duty road entrance is circular and is arranged corresponding to the position of the swirl road entrance for replenishing gas when necessary.

[0024] The thickness of the splint is 1.5-2.2 mm, and the penetration pore size is 0.5 to 1 times the thickness of the splint, so as to optimize the gas penetration effect and pressure distribution.

[0025] The beneficial effects of the present invention are as follows:

[0026] The present invention has a compact and reasonable structure and is easy to operate. Through the design of the annular shell and the clamping plate, the setting of the duty road entrance and the reasonable structural design, the efficient buffering and uniform distribution of the gas are achieved, and the accuracy and reliability of the atomization experiment are improved. This device not only provides strong support for the performance evaluation of the fuel nozzle, but also lays a solid foundation for the optimization of the combustion process and the improvement of combustion efficiency. Its innovative design concept and excellent performance will undoubtedly have a far-reaching impact on the research and application of the field of fuel combustion.

[0027] At the same time, the present invention also has the following advantages:

[0028] The present invention realizes effective buffering and uniform distribution of gas through the unique design of annular shell and clamp plate. The buffer cavity formed by the annular cavity and the clamp plate allows the incoming gas to fully diffuse in the buffer cavity, reducing the problem of uneven flow caused by the position of the air inlet. The permeable hole design on the clamp plate cleverly utilizes the principles of fluid mechanics. Through permeable holes with different pore sizes and distribution densities, the gas is finely controlled to ensure that the gas can flow evenly to each swirl path entrance after flowing out of the buffer cavity. This design not only improves the uniformity of the gas, but also enhances the stability and reliability of the air intake device.

[0029] The duty road inlet setting in this device makes it possible to accurately adjust the gas flow rate. In traditional front-end air intake devices, due to the lack of effective flow adjustment means, it is often difficult to cope with the fluctuation of gas flow at the air inlet. The duty road inlet in this device can be used as an auxiliary adjustment channel to replenish the gas flow at the swirl road inlet in time when the gas flow is insufficient, ensuring that the gas distribution of the entire system remains uniform and stable. This design not only improves the accuracy of the atomization experiment, but also provides more possibilities for the optimization of the combustion process.

[0030] The device has a reasonable structural design and is easy to process and install. Key components such as the annular shell, splint and penetration hole all adopt standardized and modular design concepts, which effectively controls the production cost of the entire device and is also conducive to later maintenance and replacement. In addition, the overall structure of the device is compact and occupies a small area, making it suitable for various experimental environments and working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional three-dimensional structural diagram of the present invention;

[0032] Figure 2 For the present invention Figure 1 The main view;

[0033] Figure 3 It is a schematic diagram of a splint of the present invention.

[0034] Among them: 100, shell; 200, nozzle installation hole; 1, air inlet; 2, buffer chamber; 3, clamping plate; 4, annular cavity; 5, duty road entrance; 6, swirl road entrance. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0036] like Figure 1-Figure 3 As shown, this embodiment discloses a front-end air intake device for atomization experiments, and its structure includes an annular housing 100, a nozzle mounting hole 200 for docking with the nozzle is provided in the middle of the housing 100, and a plurality of swirl path inlets 6 docking with the nozzle are provided on the side wall of the housing 100;

[0037] At the same time, the shell 100 is annular in structure, which is hollow inside and has an annular cavity 4 reserved therein, and a clamping plate 3 is connected to the inner wall of the outer edge of the annular cavity 4. The clamping plate 3 is annular in structure, and the bottom surface of the clamping plate 3 is parallel to the bottom surface of the annular cavity 4, so that the airflow can remain stable when flowing through the clamping plate, avoiding eddies and turbulence caused by changes in the direction of the airflow.

[0038] The distance between the bottom surface of the clamp plate 3 and the bottom surface of the annular cavity 4 is 10%-50% of the height of the annular cavity 4. This distance is designed to ensure that the airflow can be fully diffused and homogenized when flowing through the clamp plate. (The size of the distance is determined according to the airflow characteristics and experimental requirements. It is necessary to ensure that the airflow can be fully diffused and homogenized, and to avoid excessive dispersion of the airflow due to excessive distance, thereby affecting the accuracy of the experiment.) The diameter of the clamp plate 3 is 5%-15% of the diameter of the annular cavity 4. This ratio is designed to ensure that the clamp plate can cover most of the area of ​​the annular cavity, so as to effectively regulate the airflow.

[0039] The cross section of the clamp plate 3 in this embodiment is L-shaped, and the vertical section is connected to the inner top wall of the annular cavity 4, dividing the annular cavity 4 into two parts, including the buffer cavity 2 located on the upper side of the clamp plate 3 and the flow cavity located on the lower side of the clamp plate 3. The cross section of the flow cavity is L-shaped, including a horizontal section and a vertical section, and the flow cavity is connected to the swirl path inlet 6, so that the airflow can produce a swirl effect when flowing through the flow cavity, thereby further improving the atomization effect. The L-shaped design of the flow cavity also takes into account the dynamic characteristics of the airflow. Through a reasonable shape and layout, the airflow can form a stable swirl when flowing through the flow cavity, thereby improving the atomization effect.

[0040] In this embodiment, the housing 100 is also provided with an air inlet 1 connected to the buffer chamber 2. The air inlet 1 is a cylindrical inlet with a nominal inlet diameter of DN65 and an inlet height of 40 mm, which is used to supplement gas. In this embodiment, the gas refers to the premixed gas to be burned, including at least fuel gas and oxygen (usually air);

[0041] In another embodiment, the air inlet 1 is located at the radial midpoint of the buffer cavity 2 , so that the incoming gas covers the entire buffer cavity 2 more evenly.

[0042] In this embodiment, in order to improve the efficiency of air intake, the gas entering the flow cavity is made more uniform, and then the gas entering the cyclone inlet 6 is made more uniform, thereby improving the combustion effect. The bottom surface of the clamping plate 3 in this embodiment is provided with multiple groups of permeable holes distributed in annular shapes at equal intervals, and each group of permeable holes is evenly dispersed radially from the center to the outside. That is, the permeable holes are relatively dense at the position close to the center of the clamping plate 3, and as it extends to the edge, the distribution of the permeable holes gradually becomes sparse.

[0043] Specifically, in this embodiment, the outer diameter of the annular cavity 4 is 396mm-800mm, the inner diameter is 60mm-80mm, and the height is 70mm-100mm. The outer diameter of the buffer cavity 2 is 396mm-800mm, the inner diameter is 90mm-110mm, and the height of the buffer cavity 2 is 60mm-83mm.

[0044] like Figure 1 As shown, the outer diameter of the buffer cavity 2 in this embodiment is 600 mm, the inner diameter is 100 mm, and the height is 73 mm. The thickness of the clamping plate 3 is 2 mm. The height of the horizontal section of the flow cavity is 18 mm, and the height of the vertical section is 93 mm.

[0045] Specifically, the radial penetration hole spacing on the clamping plate 3 is 1 / 9 to 1 / 2 of the radial length of the clamping plate 3, and the circumferential distance of the center lines of the penetration holes is 1 / 60 to 1 / 32 of the diameter of the ring.

[0046] In this embodiment, the thickness of the clamping plate 3 is 1.5-2.2 mm, and the diameter of the permeable pores on the clamping plate 3 is 0.5 to 1 times the thickness of the clamping plate 3. When the gas passes through a hole with a smaller diameter, the flow rate of the fluid will increase, so that the kinetic energy of the fluid is converted into pressure energy, resulting in an increase in the pressure required to pass through the hole. According to the continuity equation and Bernoulli equation in fluid mechanics, an increase in flow rate will lead to an increase in pressure loss, so that a greater pressure is required to push the liquid through the pores.

[0047] Therefore, when the pressure in the buffer chamber 2 is relatively low, the gas cannot directly pass through the permeation holes with smaller apertures. However, as the gas continuously enters the buffer chamber 2, the pressure in the buffer chamber 2 also increases. At this time, when the pressure in the buffer chamber 2 reaches a certain value, the gas therein simultaneously passes through the permeation holes and moves into the flow chamber, so that the gas can evenly enter the nozzle along multiple directions of the swirl path inlet 6, thereby improving the subsequent combustion efficiency.

[0048] When gas passes through a hole with a smaller aperture, the flow rate of the fluid will increase. This phenomenon is based on the basic principles of fluid mechanics. The increase in flow rate causes the kinetic energy of the fluid to increase, which is then converted into pressure energy, so that the pressure required to pass through the hole also increases accordingly. This pressure change not only helps the uniform distribution of gas in the buffer cavity 2, but also drives the gas to flow into the circulation cavity through the pressure difference, thereby achieving effective transmission of gas. At the same time, this pressure change can also have a certain disturbing effect on the airflow, which helps to break the laminar state of the airflow in the buffer cavity 2, promote mixing and exchange between airflows, and further improve the uniformity of gas distribution.

[0049] In this embodiment, Figure 1 and Figure 2 As shown, the number of the swirl path inlets 6 is greater than 4, and the multiple swirl path inlets 6 are located on the same horizontal plane and are annularly and equidistantly distributed on the inner ring of the housing 100 .

[0050] In this embodiment, a duty path inlet 5 is provided at the upper end of each cyclone inlet 6 on the inner ring of the shell 100, that is, the front end of the airflow ejected from the nozzle. The duty path inlet 5 is circular in shape and is arranged corresponding to the position of the cyclone path inlet 6. When the gas input in the cyclone path inlet 5 is insufficient, it is supplemented through the duty path inlet 5, so that the gas input on the corresponding side is more saturated. This is because there is usually only one air inlet 1, which is located on one side of the shell 100. Therefore, even if the air is evenly fed through the penetration holes on the splint 3, the amount of air at the cyclone inlet 6 on the side of the air inlet 1 will still be greater than the amount of air at the cyclone path inlet 6 away from the side of the air inlet 1. If only the cyclone path inlet 6 is provided, uneven air intake in the nozzle will occur, which will also affect the combustion effect. At the same time, by providing the duty path inlet 5, when the amount of air supplemented by the cyclone path inlet 6 is insufficient, additional air is supplemented through the duty path inlet 5, so that the air intake is more uniform. In addition, the gas filled in the vertical section of the flow cavity can also be conveniently supplemented through the duty path inlet 5, thereby improving the effect of subsequent combustion.

[0051] In another embodiment, the number of duty road inlets 5 is less than the swirl road inlets 6, and the duty road inlet 5 is located on the side of the swirl road inlet 6 away from the air inlet 1, and the position of the duty road inlet 5 is not limited to the upper end of the swirl road 6, and can also be set at the lower end of the swirl road 6, but not on the same plane as the swirl road 6.

[0052] Therefore, the setting of the duty road inlet 5 in this embodiment not only solves the problem of uneven gas distribution, but also provides an additional means for regulating the gas flow rate during the experiment. By adjusting the gas flow rate and speed of the duty road inlet 5, the gas distribution of the entire air intake device can be finely controlled, further improving the accuracy and reliability of the atomization experiment.

[0053] like Figure 3 The figure shows a schematic diagram of a clamping plate with penetration holes of the present invention, in which the penetration holes on the clamping plate 3 are arranged in a ring manner and arranged in eight rows along the radial direction. The radial penetration hole spacing on the clamping plate 3 is 1 / 5 of the radial length of the clamping plate 3, and the annular distance of the center line of the penetration hole is 1 / 40 of the diameter of the ring. The diameter of the penetration hole on the clamping plate 3 is equal to the thickness of the clamping plate 3.

[0054] In this embodiment, the specific working principle is as follows:

[0055] like Figure 1 , Figure 2As shown, the gas from the blower enters the flow cavity of the air inlet 1, enters the flow cavity of the buffer cavity 2, collides with the surface of the flow cavity of the bottom clamp plate 3, and then flows along the two sides of the flow cavity of the buffer cavity 2 under the action of inertia, and intersects at the farthest distance from the flow cavity of the air inlet 1 to form a vortex. After the gas in the flow cavity of the buffer cavity 2 reaches a saturated state, it flows into the chamber flow cavity through the permeation holes on the flow cavity of the clamp plate 3, and finally flows out through the flow cavity of the duty road entrance 5 and the flow cavity of the cyclone entrance.

[0056] Compared with the front-end air intake device of the traditional fuel nozzle experiment, the air flow entering the swirl inlet and the duty road inlet 5 is uneven, which will affect the atomization characteristics of the experimental device and cause large experimental errors. For the present invention, through the buffer chamber 2 and the clamping plate 3 with permeable holes, the stability and uniformity of the inflowing gas can be effectively improved, and the problem of uneven flow at the fuel nozzle swirler inlet and the duty road inlet 5 can be effectively solved.

[0057] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A front-end air intake device for atomization experiment, characterized in that: include: An annular shell (100) is formed with an annular cavity (4) inside thereof for accommodating and guiding the flow of gas; The clamping plate (3) is arranged in the annular cavity (4) to divide the annular cavity (4) into a buffer cavity (2) and a flow cavity. The clamping plate (3) is provided with a permeable hole to realize the flow of gas under high pressure. A plurality of cyclone inlets (6) are equidistantly distributed in an annular shape on the side wall of the annular housing (100) and are connected to the flow chamber; The duty road inlet (5) is located on one side of the cyclone inlet (6) and is used to supplement the gas input at the cyclone road inlet (6) when the gas input is insufficient, thereby ensuring the uniformity and saturation of the gas input.

2. The front-end air intake device for atomization experiment according to claim 1, characterized in that: The annular shell (100) is annular in shape, and a nozzle mounting hole (200) is provided in the middle of the annular shell (100) for docking with the nozzle.

3. The front air intake device for atomization experiment according to claim 1, characterized in that: The clamping plate (3) is an annular structure, the cross section of the clamping plate (3) is L-shaped, the vertical section of the clamping plate (3) is connected to the inner top wall of the annular cavity (4), the bottom surface of the clamping plate (3) is parallel to the bottom surface of the annular cavity (4), and the distance between the bottom surface of the clamping plate (3) and the bottom surface of the annular cavity (4) is 10%-50% of the height of the annular cavity (4), and the diameter of the clamping plate (3) is 5%-15% of the diameter of the annular cavity (4).

4. The front air intake device for atomization experiment according to claim 1, characterized in that: The penetration holes on the clamping plate (3) are arranged in a ring-shaped manner and arranged in multiple rows along the radial direction, and each group of penetration holes includes a plurality of penetration holes that are evenly dispersed in a radial shape from the center to the outside.

5. The front air intake device for atomization experiment according to claim 1, characterized in that: It also includes an air inlet (1) which is arranged on the annular shell (100) and docked with the buffer chamber (2) for replenishing gas into the buffer chamber (2); the air inlet (1) is a cylindrical inlet which is located at the radial midpoint of the buffer chamber (2).

6. The front air intake device for atomization experiment according to claim 5, characterized in that: The air inlet (1) has a nominal diameter of DN65 and a height of 40 mm, and is suitable for supplementing premixed gas to be burned.

7. The front air intake device for atomization experiment according to claim 1, characterized in that: The cross section of the flow cavity is L-shaped, including a horizontal section and a vertical section.

8. The front air intake device for atomization experiment according to claim 1, characterized in that: The number of the cyclone inlets (6) is greater than 4 and they are evenly and equidistantly distributed on the same horizontal plane.

9. The front air intake device for atomization experiment according to claim 1, characterized in that: The duty road inlet (5) is circular in shape and is arranged corresponding to the position of the swirl road inlet (6) for replenishing gas when necessary.

10. The front air intake device for atomization experiment according to claim 3, characterized in that: The thickness of the clamping plate (3) is 1.5-2.2 mm, and the penetration pore size is 0.5 to 1 times the thickness of the clamping plate (3), so as to optimize the gas penetration effect and pressure distribution.

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