An ejector device combining spatially distributed annular slots and traditional annular slots.

Abstract

This invention belongs to the field of mechanical design and flow control technology, specifically relating to an ejector device combining spatially distributed annular slots and traditional annular slots. The ejector device comprises four parts arranged from the outside in: an ejector shell, a gas collection chamber, a traditional annular slot ejector, and a distributed annular slot ejector. The traditional annular slot ejector is located inside the ejector shell, and the distributed annular slot ejector is located inside the traditional annular slot ejector. The traditional and distributed annular slot ejectors are connected by hollow reinforcing ribs. The distributed annular slot ejector is composed of several annular slot units. The annular slot cavities of the traditional annular slot ejector and the annular slot units serve as the ejector gas channels, while the central cavity of the annular slot unit and the cavity between the traditional and distributed annular slot ejectors serve as the entrained gas channels. This ejector device increases the mixing region between the ejector gas and the entrained gas, improves the mixing degree between the ejector gas and the entrained gas, and enhances the ejection efficiency.

Description

Technical Field

[0001] This invention belongs to the field of mechanical design and flow control technology, and specifically relates to an ejector device that combines spatially distributed annular slots with traditional annular slots. Background Technology

[0002] Fluids are a general term for gases and liquids. Most fluids, such as air, water, natural gas, and oil, are substances that are indispensable to people's lives and production.

[0003] In everyday life, people don't have high requirements for fluid flow velocity. For example, tap water, heating, and natural gas only require a certain flow velocity and volume to meet the needs. However, in production and scientific research activities, it is often necessary to use high-energy fluids to eject low-energy fluids, thereby increasing the flow rate of the low-energy fluids. In the later stages of natural gas extraction, due to the low pressure in the gas field, ejector devices are needed to eject the relatively low-pressure natural gas to increase natural gas production. In power plants, fuel combustion equipment, steam boiler feedwater systems, and turbine regulation systems all require the design and installation of different types of ejector devices to eject low-energy fluids. In transient high-speed wind tunnels, corresponding ejector devices need to be designed downstream of the wind tunnel duct to eject the upstream airflow, making it easier for the airflow in the test section to reach the corresponding design requirements. In wind tunnel tests of aircraft inlets, during low Mach number tests, relying on natural flow often results in the inlet flow rate not meeting the simulation requirements, necessitating the use of ejectors to increase the inlet flow rate.

[0004] Traditional ejector devices employ a single annular slit structure, making them the earliest and simplest ejector devices to be used. However, they suffer from several drawbacks: first, there is only one mixing surface between the ejector fluid and the entrained fluid, resulting in a small energy and mass exchange area and low ejection efficiency; second, the mixing speed between the ejector and entrained fluids is slow, requiring a long mixing section and exhibiting poor fluid uniformity; and third, the ejector device has a large overall size, demanding significant installation space. In contrast, the high-speed fluid ejected from the annular slit in traditional ejector devices exerts a strong scouring effect on the mixing section wall, virtually eliminating the fluid boundary layer and effectively ensuring the flow area of ​​the mixed fluid.

[0005] The main factor affecting the ejection efficiency of an ejector device is the mixing degree of the ejector gas and the entrained gas; the higher the mixing degree, the higher the ejection efficiency. With continuous technological advancements, distributed design concepts have been widely applied in various fields. The spatially distributed annular slit ejector device is a high-efficiency ejector device. Employing a distributed design concept, it increases the mixing surface of the ejector gas and the entrained gas by spatially distributing several small annular slit units, thereby improving ejection efficiency. However, the spatially distributed annular slit ejector device also has certain shortcomings: a boundary layer of a certain thickness exists on the wall of the mixing section of the ejector, and this boundary layer gradually thickens as the flow progresses, gradually reducing the flow area of ​​the mixing section and affecting the ejection efficiency of the device.

[0006] To further improve the ejection efficiency of the ejector device, it is necessary to innovate technical means, give full play to the advantages of spatially distributed annular slit ejector devices and traditional ejector devices, integrate the two ejection methods into a design, and develop an ejector device that combines spatially distributed annular slits with traditional annular slits to further improve the ejection efficiency of the ejector device. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an ejector device that combines spatially distributed annular slits with traditional annular slits, so as to improve the mixing degree of the ejector gas and the ejected gas and improve the ejection efficiency.

[0008] The ejector device of the present invention, which combines spatially distributed annular slots with traditional annular slots, is characterized in that the ejector device comprises four parts arranged from the outside to the inside: an ejector shell, a gas collection chamber, a traditional annular slot ejector, and a distributed annular slot ejector; the traditional annular slot ejector is located inside the ejector shell, the distributed annular slot ejector is located inside the traditional annular slot ejector, and the traditional annular slot ejector and the distributed annular slot ejector are connected by hollow reinforcing ribs;

[0009] The ejector housing consists of the front shell of the ejector core section, the ejector gas inlet section, and the rear section of the ejector; the gas collection chamber consists of the cavity connecting the ejector core section, the ejector gas inlet section, and the rear section of the ejector; the traditional annular slit ejector is composed of the rear shell of the ejector core section and the front shell of the rear section of the ejector; the distributed annular slit ejector is composed of several annular slit unit bodies.

[0010] The traditional annular slit ejector has an axisymmetric structure with a circular cross-section. The front end of the cavity of the traditional annular slit ejector is connected to the gas collection chamber. The outer surface of the rear end shell of the ejector core section and the inner surface of the front end of the rear section of the ejector form the annular slit cavity. A nozzle is installed in the annular slit cavity. The annular slit cavity is a component of the ejector gas channel.

[0011] The distributed annular slit ejector comprises several annular slit units, each with a spun-out double-layered tubular structure. The front section of the distributed annular slit ejector is connected to the core shell of the ejector via hollow reinforcing ribs. The hollow portion of the reinforcing ribs forms part of the gas collection chamber, providing a flow channel for the ejected gas within the annular slit unit. A nozzle is located at the rear of the annular slit unit cavity. The annular slit cavity of the annular slit unit forms part of the ejected gas channel, while the central cavity forms the channel for the ejected gas. The cavity between the traditional annular slit ejector and the distributed annular slit ejector forms part of the ejected gas channel. The front faces of each annular slit unit collectively form a rectifier orifice plate, with each orifice on the rectifier orifice plate corresponding to the central cavity of one annular slit unit.

[0012] The ejector gas inlet section is equipped with a high-pressure gas inlet, and the gas collecting chamber is connected to the high-pressure gas inlet; the ejector rear section includes a mixing section and an expansion section in sequence. The mixing section is a mixing area of ​​the ejector gas and the ejected gas, and the expansion section has a deceleration and pressurization function.

[0013] The entrained gas flows into the mixing section through the entrained gas channel; simultaneously, high-pressure gas enters the gas collecting chamber from the high-pressure gas inlet and is ejected through the conventional annular slit ejector and the distributed annular slit ejector to form entrained gas; the entrained gas ejected from the conventional annular slit ejector forms a large annular mixing region within the mixing section; the entrained gas ejected from the distributed annular slit ejector forms multiple small annular mixing regions within the large annular mixing region of the mixing section; after the entrained gas and the entrained gas are mixed in the mixing section, they flow into the expansion section.

[0014] The pressure range of the high-pressure gas is 0.6MPa~0.8MPa.

[0015] Furthermore, the high-pressure gas pressure is sufficient to generate supersonic flow in the nozzle, and the magnitude of the high-pressure gas pressure is determined by the nozzle profile and the pressure of the mixing section.

[0016] Furthermore, the nozzle is one or a combination of two of the following: a full nozzle, a half nozzle, and a combination of both. The cross-sectional shape of the full nozzle is symmetrical with respect to the centerline of the annular cavity, with the inner and outer surfaces first contracting and then expanding to form a throat in the middle. The cross-sectional shape of the outer side of the half nozzle is the same as that of the outer side of the full nozzle, while the inner side is a smooth wall. The nozzle Mach number is determined by the ratio of the expansion outlet size to the throat size; the larger the ratio, the larger the nozzle Mach number.

[0017] Furthermore, sealant or gaskets are filled between the core section of the ejector and the ejector gas inlet section, and between the ejector gas inlet section and the rear section of the ejector.

[0018] Furthermore, the size, number, and spacing of the annular slot units contained in the distributed annular slot ejector are determined through computer simulation based on the ejector cavity size and the flow rate of the ejected gas.

[0019] Furthermore, the number of hollow reinforcing ribs and the dimensions of the hollow parts used in the connection between the front section of the annular seam unit and the core section of the ejector are determined through computer simulation based on the strength requirements and the ejector gas flow rate requirements.

[0020] The ejector device of the present invention, which combines spatially distributed annular slots with conventional annular slots, is suitable for fluid ejection control, including gases and liquids.

[0021] The ejector device of the present invention, which combines spatially distributed annular slots with traditional annular slots, has the following characteristics:

[0022] 1. A design method combining spatially distributed annular slit ejection and traditional annular slit ejection is adopted, which fully leverages the advantages of both ejection methods. Spatially distributed annular slit ejection uses a distributed design concept, with several annular slit units arranged spatially within the ejector tube cavity, generating several small cylindrical thin-layer high-energy gas layers and forming several small cylindrical energy and matter (mass) exchange regions. Traditional annular slit ejection generates large cylindrical thin-layer high-energy gas layers, forming large cylindrical energy and matter (mass) exchange regions. Together, they improve the mixing degree of the ejector gas and the ejected gas, increase the ejection efficiency of the ejector device, and reduce the mixing length.

[0023] 2. The large cylindrical thin layer of high-energy gas ejected from the traditional annular slit has a scouring effect on the wall of the mixing section, which inhibits the formation and development of the boundary layer on the wall of the mixing section, fully ensuring the flow efficiency of the mixing section, and playing a positive role in improving the ejection efficiency of the ejector device.

[0024] 3. The front end of each annular slit cavity and the hollow reinforcing rib form a "natural" large-capacity gas collection chamber, which can provide sufficient high-energy gas for the annular slit unit. The hollow reinforcing rib not only provides support for the distributed annular slit ejector and provides a channel for the flow of high-energy fluid, but also helps the gas pressure in the gas collection chamber and the annular slit unit to quickly reach equilibrium.

[0025] 4. By making full use of the connection structure between the core section of the ejector, the ejector gas inlet section and the rear section of the ejector, a "natural" annular gap is formed between the core section of the ejector and the rear section of the ejector, which reduces the impact of traditional slot ejector devices on the external dimensions of the ejector device.

[0026] 5. The rectifier orifice plate effectively reduces the interference of the ejector device on the upstream flow of the ejected gas.

[0027] In short, the ejector device of the present invention, which combines spatially distributed annular slots with traditional annular slots, increases the energy and mass exchange area between the ejector gas and the ejected gas, thereby improving the mixing degree between them, increasing the ejection efficiency, reducing the length of the mixing section, and reducing the interference of the ejector device on the upstream flow of the ejected gas. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the ejector device of the present invention, which combines spatially distributed annular slots with traditional annular slots;

[0029] Figure 2 This is a schematic cross-sectional view (A) of the ejector device of the present invention, which combines spatially distributed annular slots with conventional annular slots.

[0030] Figure 3 This is a schematic diagram of cross-section B of the ejector device that combines spatially distributed annular slots with conventional annular slots according to the present invention.

[0031] In the figure, 1. Ejector core section; 2. Ejector gas inlet section; 3. Ejector rear section; 4. Gas collection chamber; 5. Mixing section; 6. Expansion section; 7. Circumferential seam unit; 8. Hollow reinforcing rib. Detailed Implementation

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] Example 1:

[0034] like Figures 1-3 As shown, the ejector device combining spatially distributed annular slots and traditional annular slots in this embodiment includes four parts arranged from the outside to the inside: ejector housing, gas collection chamber 4, traditional annular slot ejector body, and distributed annular slot ejector body; the traditional annular slot ejector body is located inside the ejector housing, and the distributed annular slot ejector body is located inside the traditional annular slot ejector body. The traditional annular slot ejector body and the distributed annular slot ejector body are connected by hollow reinforcing ribs 8.

[0035] The ejector housing consists of the front shell of the ejector core section 1, the ejector gas inlet section 2, and the ejector rear section 3; the gas collection chamber 4 is formed by the cavity connecting the ejector core section 1, the ejector gas inlet section 2, and the ejector rear section 3; the traditional annular slit ejector is jointly formed by the rear shell of the ejector core section 1 and the front end of the ejector rear section 3; the distributed annular slit ejector is composed of several annular slit unit bodies 7.

[0036] The traditional annular ejector has an axisymmetric structure with a circular cross-section. The front end of the cavity of the traditional annular ejector is connected to the gas collection chamber 4. The outer surface of the rear end shell of the ejector core section 1 and the inner surface of the front end of the ejector rear section 3 form the annular cavity. A nozzle is installed in the annular cavity. The annular cavity is a component of the ejector gas channel.

[0037] The distributed annular slit ejector comprises several annular slit units 7, each annular slit unit 7 being a spun-out double-layered tubular structure. The front section of the distributed annular slit ejector is connected to the core section 1 shell of the ejector via hollow reinforcing ribs 8. The hollow portion of the reinforcing ribs forms part of the gas collection chamber 4, providing a flow channel for the ejected gas in the annular slit unit 7. A nozzle is provided at the rear section of the cavity of the annular slit unit 7. The annular slit cavity of the annular slit unit 7 forms part of the ejected gas channel, and the central cavity forms the channel for the ejected gas. The cavity between the traditional annular slit ejector and the distributed annular slit ejector forms part of the channel for the ejected gas. The front faces of each annular slit unit 7 together form a rectifier orifice plate, with one hole on the rectifier orifice plate corresponding to the central cavity of one annular slit unit 7.

[0038] The ejector gas inlet section 2 is provided with a high-pressure gas inlet, and the gas collecting chamber 4 is connected to the high-pressure gas inlet; the ejector rear section 3 includes a mixing section 5 and an expansion section 6 in sequence. The mixing section 5 is a mixing area of ​​the ejector gas and the ejected gas, and the expansion section 6 has a deceleration and pressurization function.

[0039] The entrained gas flows into the mixing section 5 through the entrained gas channel; simultaneously, the high-pressure gas enters the gas collecting chamber 4 from the high-pressure gas inlet and is ejected through the conventional annular slit ejector and the distributed annular slit ejector to form entrained gas; the entrained gas ejected from the conventional annular slit ejector forms a large annular mixing region in the mixing section 5; the entrained gas ejected from the distributed annular slit ejector forms multiple small annular mixing regions within the large annular mixing region of the mixing section 5; after the entrained gas and the entrained gas are mixed in the mixing section 5, they flow into the expansion section 6;

[0040] The pressure range of the high-pressure gas is 0.6MPa~0.8MPa.

[0041] Furthermore, the high-pressure gas pressure is sufficient to generate supersonic flow in the nozzle, and the magnitude of the high-pressure gas pressure is determined by the nozzle profile and the pressure of the mixing section 5.

[0042] Furthermore, the nozzle is one or a combination of two of the following: a full nozzle, a half nozzle, and a combination of both. The cross-sectional shape of the full nozzle is symmetrical with respect to the centerline of the annular cavity, with the inner and outer surfaces first contracting and then expanding to form a throat in the middle. The cross-sectional shape of the outer side of the half nozzle is the same as that of the outer side of the full nozzle, while the inner side is a smooth wall. The nozzle Mach number is determined by the ratio of the expansion outlet size to the throat size; the larger the ratio, the larger the nozzle Mach number.

[0043] Furthermore, sealant or gaskets are filled between the core section 1 of the ejector and the ejector gas inlet section 2, and between the ejector gas inlet section 2 and the rear section 3 of the ejector.

[0044] Furthermore, the size, number, and spacing of the annular slot units 7 included in the distributed annular slot ejector are determined through computer simulation based on the ejector cavity size and the flow rate of the ejected gas.

[0045] Furthermore, the number of hollow reinforcing ribs 8 used to connect the front section of the annular seam unit 7 and the core section 1 of the ejector, as well as the size of the hollow part, are determined through computer simulation based on the strength requirements and the ejector gas flow rate requirements.

[0046] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the protection scope of this invention.

Claims

1. An ejector device combining spatially distributed annular slots and traditional annular slots, characterized in that, The ejector device comprises four parts arranged from the outside to the inside: ejector housing, gas collection chamber (4), traditional annular slit ejector and distributed annular slit ejector; the traditional annular slit ejector is located inside the ejector housing, the distributed annular slit ejector is located inside the traditional annular slit ejector, and the traditional annular slit ejector and the distributed annular slit ejector are connected by hollow reinforcing ribs (8). The ejector housing consists of the front end housing of the ejector core section (1), the ejector gas inlet section (2), and the rear end section (3) of the ejector; the gas collection chamber (4) consists of the cavity connecting the ejector core section (1), the ejector gas inlet section (2), and the rear end section (3); the traditional annular slit ejector is composed of the rear end housing of the ejector core section (1) and the front end of the rear end section (3); the distributed annular slit ejector is composed of several annular slit unit bodies (7); The traditional annular ejector is an axisymmetric structure with a circular cross-section. The front end of the cavity of the traditional annular ejector is connected to the gas collection chamber (4). The outer surface of the rear end shell of the ejector core section (1) of the cavity and the inner surface of the front end of the ejector rear section (3) form an annular cavity. A nozzle is installed in the annular cavity. The annular cavity is a component of the ejector gas channel. The distributed annular slit ejector includes several annular slit units (7). The annular slit unit (7) is a spiral double-layer tube structure. The front section of the distributed annular slit ejector is connected to the shell of the ejector core section (1) through a hollow reinforcing rib (8). The hollow part of the reinforcing rib is a component of the gas collection chamber (4) and provides a flow channel for the ejected gas for the annular slit unit (7). A nozzle is provided in the rear section of the cavity of the annular slit unit (7). The annular cavity of the annular slit unit (7) is a component of the ejected gas channel, and the central cavity is the ejected gas channel. The cavity between the traditional annular slit ejector and the distributed annular slit ejector is a component of the ejected gas channel. The front end faces of each annular slit unit (7) together form a flow rectifier plate. One hole on the flow rectifier plate corresponds to the central cavity of one annular slit unit (7). The ejector gas inlet section (2) is provided with a high-pressure gas inlet, and the gas collecting chamber (4) is connected to the high-pressure gas inlet; the ejector rear section (3) includes a mixing section (5) and an expansion section (6) in sequence, and the mixing section (5) is the mixing area of ​​the ejector gas and the ejected gas; The pressure range of the high-pressure gas is 0.6MPa~0.8MPa.

2. The ejector device combining spatially distributed annular slots and traditional annular slots according to claim 1, characterized in that, The pressure of the high-pressure gas is determined by the nozzle profile and the pressure of the mixing section (5).

3. The ejector device combining spatially distributed annular slots and traditional annular slots according to claim 1, characterized in that, The nozzle is one or a combination of two of the following: a full nozzle, a half nozzle; the cross-sectional shape of the full nozzle is symmetrical with respect to the centerline of the annular cavity; the cross-sectional shape of the outer side of the half nozzle is the same as that of the outer side of the full nozzle, and the inner side is a smooth wall surface; the nozzle Mach number is determined by the ratio of the expansion outlet size to the throat size.

4. The ejector device combining spatially distributed annular slots and traditional annular slots according to claim 1, characterized in that, Sealant or gaskets are filled between the core section (1) of the ejector and the ejector gas inlet section (2), and between the ejector gas inlet section (2) and the rear section (3) of the ejector.

5. The ejector device combining a distributed nozzle and annular slot according to claim 1, characterized in that, The size, number and spacing of the annular slit units (7) contained in the distributed annular slit ejector are determined by computer simulation based on the inner cavity size of the ejector and the flow rate of the ejected gas.

6. The ejector device combining spatially distributed annular slots and traditional annular slots according to claim 1, characterized in that, The number of hollow reinforcing ribs (8) and the size of the hollow part used to connect the front section of the annular seam unit (7) and the core section (1) of the ejector are determined by computer simulation based on the strength requirements and the ejector gas flow requirements.

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