A mixer for high flow high and low temperature gaseous media

Abstract

This invention discloses a mixer for high-flow-rate high- and low-temperature gas media. It includes three cylinders, I, II, and III, connected coaxially in sequence. A mixing nozzle for receiving high-temperature gas flow is disposed on the axis of cylinders I and II. The mixing nozzle is fitted with a mixing cone sleeve, the smaller opening of which connects to the outer wall of the mixing nozzle, and the larger opening connects to the inner wall of cylinder II. Jet holes I are distributed on the conical surface of the mixing cone sleeve. Jet holes II are distributed on the wall of the mixing nozzle within the range of the mixing cone sleeve. The tail end of the mixing nozzle is open for receiving the high-temperature gas flow, while the head end is closed. This invention achieves thorough mixing of high and low-temperature air through the design of the internal flow channel, resulting in high temperature uniformity at the final outlet. Simultaneously, the entire pressure-bearing device is protected by low-temperature gas, reducing the difficulty of material selection and design, and lowering the manufacturing cost of the mixer.

Description

Technical Field

[0001] This invention belongs to the technical field of process systems for aerospace and aviation ground test equipment, specifically relating to a mixer for high-flow-rate high and low temperature gas media. Background Technology

[0002] With the continuous development of my country's aviation industry, the demand for advanced aero-engines has become urgent. Ground test rigs, as the main equipment for engine testing, must develop in tandem with engine advancements. As engine performance improves, the relevant specifications of ground test rigs also increase. Typically, engine ground test rigs establish the airflow conditions for the tested engine during its operating state, with core indicators including the flow rate, pressure, and temperature of the intake system. However, under high-flow-rate conditions, heating or heat exchange equipment, due to its large mass, exhibits high thermal inertia, making rapid temperature switching impossible, which cannot meet the testing conditions of many engines. While mixing hot and cold airflows is commonly used to quickly reach the temperature values ​​required for the test conditions, the low density and inertia of the gas medium mean that when two or more gas media are mixed at high flow rates, the secondary flow struggles to enter the mainstream, resulting in insufficient mixing. This leads to a distinct boundary between the central and outer circulation flows, with poor temperature uniformity across the airflow cross-section, a condition unacceptable for engine operation. Summary of the Invention

[0003] The purpose of this invention is to provide a mixer for high-flow-rate high- and low-temperature gas media. This invention utilizes an internal flow channel design to ensure thorough mixing of high and low-temperature air, resulting in high temperature uniformity at the final outlet. Simultaneously, the entire pressure-bearing device is protected by low-temperature gas, reducing the difficulty of material selection and design, and lowering the manufacturing cost of the mixer.

[0004] The technical solution of the present invention is as follows: a mixer for high-flow-rate high and low temperature gas media, comprising cylinder I, cylinder II and cylinder III connected coaxially in sequence; a mixing pipe for receiving high-temperature gas flow is provided on the axis of cylinder I and II, the mixing pipe is covered with a mixing cone sleeve, the small opening edge of the mixing cone sleeve is connected to the outer wall of the mixing pipe, and the large opening edge is connected to the inner wall of cylinder II; jet holes I are distributed on the cone surface of the mixing cone sleeve; jet holes II are distributed on the pipe wall of the mixing pipe within the range of the mixing cone sleeve; the tail end of the mixing pipe is an open end for receiving high-temperature gas flow, and the head end is a closed end.

[0005] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the closed end of the mixing pipe is in the shape of a pointed cone to form a flow guide cone; the flow guide cone extends axially out of the mixing cone sleeve range, but does not exceed the range of the cylinder II.

[0006] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, only a support assembly is provided between the outer wall of the guide cone and the cylinder II.

[0007] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the cylinder wall of the cylinder III gradually contracts along the axial direction, forming a contraction zone.

[0008] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the tail end of the mixing connector is connected to the head end of connector I via connector II, and the tail end of connector I extends through the cylinder wall of cylinder I.

[0009] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the tail end of the connecting pipe I is provided with a high-temperature gas inlet flange.

[0010] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the tail end of the cylinder I is provided with a low-temperature gas inlet flange.

[0011] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the head end of the cylinder III is provided with an outlet flange.

[0012] In the aforementioned mixer for high-flow-rate high- and low-temperature gas media, the cylinder I gradually expands axially and then connects to the cylinder II.

[0013] The advantages of this invention are as follows: This invention designs a mixer for high-flow-rate high and low-temperature gas media. The mixer is equipped with two flow channels, one for high temperature and one for low temperature. The low-temperature gas is placed in the outer flow channel, which can protect the pressure-bearing shell and reduce the design difficulty and cost of the pressure-bearing shell. A mixing pipe is set in the cold flow channel to receive the high-temperature gas. The small opening of the mixing cone sleeve is connected to the outer wall of the mixing pipe, and the large opening is connected to the inner wall of the cylinder II. At the same time, jet holes I and II are respectively set on the cone surface of the mixing cone sleeve and the wall of the mixing pipe. With this structure, a mixing region is formed on the inner wall of the mixing cone sleeve and the outer wall of the mixing pipe. At the same time, as the low-temperature gas moves axially from the cylinder I to the mixing cone sleeve, the fluid cross-section gradually decreases, which increases the jet velocity of the low-temperature gas flow into the mixing region through jet hole I, making it easier for the secondary flow (low-temperature gas flow) to mix into the mainstream flow (high-temperature gas flow) that enters the mixing region through jet hole II. Moreover, the mixing region structure formed by the inner wall of the mixing cone sleeve and the outer wall of the mixing nozzle is a narrow mixing interlayer, which can effectively reduce the mixing distance between the secondary flow and the main flow, and promote the full mixing of cold and hot airflows within the interlayer.

[0014] The present invention provides a flow guide cone that forms a gradually expanding fluid profile with the cylinder II, and a gradually contracting fluid profile through the inner wall of the cylinder III. This structure allows the mixed hot and cold airflows to pass through the expansion and contraction in sequence, thereby allowing the hot and cold airflows to be fully mixed again, and finally achieving a high temperature uniformity at the outlet.

[0015] Through the above structural optimization, the mixer of the present invention can quickly switch operating conditions according to the needs of the test specimens in the engine component test bench, and can more realistically simulate the required operating conditions of the test specimens.

[0016] In summary, the present invention achieves thorough mixing of high and low temperature air through the design of the internal flow channel, resulting in high temperature uniformity at the final outlet; at the same time, the entire pressure-bearing equipment is protected by low temperature gas, which reduces the difficulty of equipment material selection and design, and reduces the manufacturing cost of the mixer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Reference numerals: 1-Low-temperature gas inlet flange, 2-Cylinder I, 3-High-temperature gas inlet flange, 4-Connector I, 5-Connector II, 6-Mixing connector, 7-Mixing cone sleeve, 8-Support assembly, 9-Cylinder II, 10-Guide cone, 11-Cylinder III, 12-Outlet flange, 13-Jet hole I, 14-Jet hole II. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0020] Example 1. A mixer for high-flow-rate high and low temperature gas media, configured as follows: Figure 1 As shown, the mixer includes three cylinders, I2, II9, and III11, connected coaxially in sequence. A mixing pipe 6 for receiving high-temperature airflow is installed on the axis of cylinders I and II. A mixing cone sleeve 7 is fitted over the mixing pipe 6, with its small opening connected to the outer wall of the mixing pipe 6 and its large opening connected to the inner wall of cylinder II9. Jet holes I13 are distributed on the conical surface of the mixing cone sleeve 7. Jet holes II14 are distributed on the wall of the mixing pipe 6 within the range of the mixing cone sleeve 7. The tail end of the mixing pipe 6 is open for receiving high-temperature airflow, while its head end is closed. When low-temperature airflow enters the mixer, the mixing cone sleeve 7 and cylinder I2 form a gradually narrowing cavity, increasing the local pressure. This increases the velocity of the low-temperature airflow injected into the mixing region along the jet holes I13, promoting thorough mixing of the cold airflow. Furthermore, the narrow mixing region reduces the mixing distance between the secondary and main flows, further promoting thorough mixing of the cold and hot airflows within the mixing region.

[0021] The aforementioned mixing pipe 6 has a closed end that is cone-shaped to form a guide cone 10; the guide cone 10 extends axially beyond the range of the mixing cone sleeve 7, but does not exceed the range of the cylinder II 9.

[0022] The aforementioned guide cone 10 has only a support component 8 between its outer wall and the cylinder II 9.

[0023] The aforementioned cylinder III11 has a gradually contracting wall along the axial direction, forming a contraction zone.

[0024] The cylinder II9 and the guide cone 10 form the expansion zone, and the cylinder III11 forms the contraction zone. The well-mixed airflow passes through the expansion zone and the contraction zone in sequence, mixes again, and finally reaches a fluid with a certain temperature uniformity at the outlet.

[0025] The tail end of the aforementioned mixing connector 6 is connected to the head end of connector I4 via connector II5, and the tail end of connector I4 extends through the cylinder wall of cylinder I2.

[0026] The aforementioned connector I4 is equipped with a high-temperature gas inlet flange 3 at its tail end.

[0027] The aforementioned cylinder I2 is equipped with a low-temperature gas inlet flange 1 at its tail end.

[0028] The aforementioned cylinder Ⅲ11 is provided with an outlet flange 12 at its head end.

[0029] The aforementioned cylinder I2 gradually expands axially and connects to cylinder II9. This structure is more conducive to the gradual reduction of the fluid cross-section as the low-temperature airflow travels axially from cylinder I2 to the mixing cone sleeve 7.

[0030] This invention is mainly applied to the mixing of multiphase flows in the process systems of aerospace and aviation ground test equipment, and to application scenarios where the process gas needs to achieve a certain flow field quality after mixing. It can also be applied to industries that require mixing in pipeline systems such as non-ferrous metals, metallurgy, and chemicals.

Claims

1. A mixer for high flow high and low temperature gaseous media, characterized by: It includes cylinder I (2), cylinder II (9) and cylinder III (11) connected coaxially in sequence; a mixing pipe (6) for receiving high-temperature airflow is provided on the axis of cylinder I and II, and a mixing cone sleeve (7) is fitted over the mixing pipe (6). The small opening edge of the mixing cone sleeve (7) is connected to the outer wall of the mixing pipe (6), and the large opening edge is connected to the inner wall of cylinder II (9); jet holes I (13) are distributed on the cone surface of the mixing cone sleeve (7); jet holes II (14) are distributed on the pipe wall of the mixing pipe (6) within the range of the mixing cone sleeve (7); the tail end of the mixing pipe (6) is an open end for receiving high-temperature airflow, and the head end is a closed end.

2. A mixer for high flow high and low temperature gaseous media as claimed in claim 1, wherein: The closed end of the mixing pipe (6) is a pointed cone to form a guide cone (10); the guide cone (10) extends axially out of the mixing cone sleeve (7) but does not exceed the range of the cylinder II (9).

3. A mixer for high flow high and low temperature gaseous media as claimed in claim 2, wherein: Only a support assembly (8) is provided between the outer wall of the guide cone (10) and the cylinder II (9).

4. The mixer for high flow high and low temperature gaseous media of claim 1, wherein: The cylinder wall of the cylinder Ⅲ(11) gradually contracts along the axial direction, forming a contraction zone.

5. The mixer for high-flow-rate high- and low-temperature gas media according to claim 1, characterized in that: The tail end of the mixing connector (6) is connected to the head end of the connector I (4) through the connector II (5), and the tail end of the connector I (4) extends through the cylinder wall of the cylinder I (2).

6. The mixer for high-flow-rate high- and low-temperature gas media according to claim 5, characterized in that: The end of the connector I (4) is equipped with a high-temperature gas inlet flange (3).

7. The mixer for high-flow-rate high- and low-temperature gas media according to claim 1, characterized in that: The tail end of the cylinder I (2) is provided with a low-temperature gas inlet flange (1).

8. The mixer for high-flow-rate high- and low-temperature gas media according to claim 1, characterized in that: The head end of the cylindrical body Ⅲ (11) is provided with an outlet flange (12).

9. The mixer for high-flow-rate high- and low-temperature gas media according to claim 1, characterized in that: The cylinder I (2) gradually expands along the axial direction and then connects with the cylinder II (9).

Images