Gas cyclone mixing device and use thereof

Abstract

The application belongs to the technical field of gas mixing, and discloses a gas cyclone mixing device and application thereof, which comprises a mixing cavity, a cyclone structure and a sleeve, wherein the cyclone structure is fixed in the mixing cavity through the sleeve, and the mixing cavity is divided into a mixed flow area, a cyclone area and an equal flow area from left to right in sequence; the cyclone structure comprises a circular plate and a flow-around column fixedly connected, the circular plate is in transition fit with the sleeve, the left side area of the circular plate is the mixed flow area, a plurality of gas inlets are arranged in the mixed flow area, and a plurality of inclined holes are formed in the circular plate; there is a gap between the flow-around column and the sleeve, and the gap is the cyclone area; the equal flow area is a necking portion with a gradually decreasing cross-sectional diameter from left to right, and the right end of the sleeve is in contact with the left side of the necking portion. The application can be applied to mixing of various gases at different temperatures under the working condition of 300k-1500k, and has the advantages of simple structure, rapid, sufficient and uniform mixing, and no power source.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas mixing, and more particularly relates to a gas cyclone mixing device and application thereof. BACKGROUND

[0002] Total temperature is a basic atmospheric parameter inputted by a navigation system of a space vehicle during flight, and by introducing a real gas total temperature signal into a vehicle development process through semi-physical simulation of a space vehicle total temperature signal, a development cycle can be effectively shortened and development cost can be reduced.

[0003] A cold-hot gas flow mixing device is one of key components for realizing a real gas total temperature signal, and it is difficult to design the mixing device to realize rapid and sufficient mixing of cold-hot gas flow in a small space, and the current rapid mixing cavity is faced with problems of short contact time of cold-hot gas flow, insufficient and uneven mixing, and the mixing sufficiency of the mixing device directly affects a change gradient and precision of the total temperature signal.

[0004] Therefore, the prior mixing device needs to be further improved and perfected, and a cold-hot gas flow mixing device suitable for a high-temperature environment and rapid and sufficient mixing is designed to meet urgent needs of the mixing device in semi-physical simulation of a total temperature signal. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a gas cyclone mixing device and application thereof, and the purpose is to realize rapid and uniform mixing of several gases without a power source.

[0006] To achieve the above purpose, according to one aspect of the present application, a gas cyclone mixing device is provided, comprising a mixing cavity, a cyclone structure and a sleeve, wherein:

[0007] The cyclone structure is fixed in the mixing cavity through the sleeve, and the mixing cavity is divided into a mixing flow zone, a cyclone zone and an equal flow zone from left to right in sequence;

[0008] The cyclone structure comprises a circular plate and a flow-around column fixedly connected, the circular plate is in transition fit with the sleeve, a left side area of the circular plate is the mixing flow zone, a plurality of gas inlets are arranged at the mixing flow zone, a plurality of inclined holes are arranged on the circular plate; there is a gap between the flow-around column and the sleeve, and the gap is the cyclone zone; the equal flow zone is a necking portion with a gradually decreasing cross-sectional diameter from left to right, and a right end of the sleeve is in contact with a left side of the necking portion.

[0009] As a further preferred, an outer diameter of the flow-around column is 5 / 8-7 / 8 of an inner diameter of the sleeve, and the flow-around column is internally hollowed out.

[0010] As further preferred, the inclined holes are 3-8 in total, and the distance from the left end center of each inclined hole to the left end center of the circular plate is equal.

[0011] For any inclined hole, the inclined hole axis is located on a hole section plane of the inclined hole, the hole section plane passes through the left end center of the inclined hole and a certain adjacent inclined hole, and the hole section plane is parallel to the circular plate axis; the angle between the inclined hole axis and the circular plate axis on the hole section plane projection line is 20-45°.

[0012] As further preferred, the inclined holes are 4 in total, and the distance from the left end center of each inclined hole to the left end center of the circular plate is half of the radius of the circular plate; for any inclined hole, the angle between the inclined hole axis and the circular plate axis on the hole section plane projection line is 30°.

[0013] As further preferred, the total flow area of all inclined holes on the circular plate is equal to the flow area of the gap between the flow-around column and the sleeve.

[0014] As further preferred, the gap between the outer side of the sleeve and the inner side of the mixing cavity is 0.5-1 mm.

[0015] As further preferred, the mixing cavity is made of alumina ceramic, and the flow-around structure and the sleeve are made of 45 steel.

[0016] As further preferred, the circular plate and the flow-around column are fixed by a conical surface, and the cross-sectional diameter of the conical surface gradually increases from left to right.

[0017] As further preferred, the left end of the mixing area is provided with a first gas inlet along the axis of the mixing cavity, and the side of the mixing area is provided with a second gas inlet inclined to the first gas inlet.

[0018] According to another aspect of the present application, the gas flow mixing device is used to generate a total temperature signal.

[0019] Overall, compared with the prior art, the above technical solutions conceived by the present application mainly have the following technical advantages:

[0020] 1. The present application generates flow channel changes by the cooperation of inclined holes and flow-around columns, so that the mixed gas spontaneously rotates at high speed, passive stirring is realized under the condition of no external power source, and then the mixed gas flow is distributed compactly and uniformly by the cavity necking, so that the gas is quickly and fully mixed and has high uniformity.

[0021] 2. The right part of the mixing cavity is a necking with a smaller diameter, which can be axially positioned with the sleeve on one hand, and can reduce the flow area on the other hand, so that the mixed gas has a relatively uniform momentum distribution after passing through the flow-around area, and realizes uniform flow after flowing for a distance.

[0022] 3. The gas cyclone mixing device provided by the present application has a small volume, so that the consumption of cold and hot gas flow is small, heat loss is small, high-temperature mixed gas signals can be obtained on the basis of small flow gas, energy is saved, and energy consumption is small; meanwhile, the cyclone structure is simple, and has the advantages of easy processing and easy disassembly.

[0023] 4. The internal shape of the flow column is hollowed out, the mass of the cyclone structure is reduced, and the heat loss of the gas flow is reduced; meanwhile, the external diameter of the flow column is specifically designed, so that a small annular flow channel is formed between the flow column and the sleeve, the gas flow after passing through the inclined hole has small pressure resistance and large speed, the mixed gas has high momentum, and the collision and mixing between the gases can be strengthened.

[0024] 5. The specific number and angle of the inclined hole are designed to reduce the speed loss in the rotation process of the gas flow and ensure that the gases are fully mixed; in addition, the flow area of the inclined hole is substantially equal to the flow area of the flow column, so as to ensure the rotation speed and intensity of the mixed gas flow.

[0025] 6. The diameter of the sleeve is slightly smaller than the inner diameter of the mixing cavity, so as to reserve a thermal expansion allowance, prevent the mixed cavity from being broken due to thermal expansion of the cyclone structure, make the cyclone mixing structure safe and reliable, and be resistant to high temperature; meanwhile, the use of high-temperature-resistant materials makes the cyclone mixing structure more suitable for high-temperature and large-flow working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the gas cyclone mixing device of the embodiment of the present application.

[0027] Figure 2 It is a schematic view of the cyclone structure of the embodiment of the present application, wherein (a) is an A-A cross section, (b) is a left view, and (c) is a C-C cross section.

[0028] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein 1 is a mixing cavity, 2 is a cyclone structure, 3 is a sleeve, 21 is a circular plate, 22 is a conical surface, 23 is a flow column, 24 is an inclined hole, and 25 is a chamfer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] The gas cyclone mixing device provided by the embodiment of the present application, as shown in Figure 1 , comprises a mixing cavity 1, a cyclone structure 2 and a sleeve 3, wherein:

[0031] The cyclone structure 2 is transitionally fitted with the sleeve 3 and placed in the middle of the mixing cavity 1, and the cyclone structure 2 divides the mixing cavity into a mixing flow area, a cyclone area and an equal flow area from left to right;

[0032] The mixing flow area in the left part of the mixing cavity is provided with a first gas inlet along the axis and second and third gas inlets inclined to the first gas inlet, and the specific number of the inlets is determined according to the requirement;

[0033] The cyclone structure 2 comprises a circular plate 21 and a flow column 23 connected in sequence from left to right; the peripheral surface of the circular plate 21 is transitionally fitted with the sleeve 3, so that the sleeve and the cyclone structure have no relative movement; there is a gap between the flow column 23 and the sleeve 3, and the gap is the cyclone area; a plurality of central symmetrical inclined holes 24 are formed in the circular plate 21 for changing the velocity direction of the mixed gas flow; after the mixed gas flow with tangential velocity enters the cyclone area, it rotates forward around the flow column with high momentum, so as to achieve the purpose of rotation and passive stirring;

[0034] The equal flow area in the right part of the mixing cavity is a necking with a smaller diameter, so that the mixed gas flow rotating along the inner wall of the mixing cavity in the cyclone area converges inward and collides for the second time, and the velocity non-uniformity of the mixed gas flow along the radial direction is reduced; after moving a distance in the equal flow area, the mixed gas flow gradually becomes stable and uniform, so that the mixed gas flow is mixed sufficiently and uniformly; the right end of the sleeve 3 is close to the necking of the equal flow area, so as to resist the thrust of the mixed gas flow on the cyclone structure 2 during work and realize axial positioning.

[0035] Further, the outer diameter of the flow column 23 is smaller than the inner diameter of the sleeve 3, and is preferably 5 / 8 to 7 / 8 of the inner diameter of the sleeve; so that the annular flow channel space between the flow column and the sleeve is small, so that the mixed gas flow has small pressure resistance and large velocity during rotation, and the mixed gas flow rotates in the cyclone area with high momentum, and the intensity of mutual collision of fluid microgroups is enhanced.

[0036] Further, the flow column 23 is hollow inside to reduce the weight of the cyclone structure 2 and reduce the heat loss of the mixed gas flow.

[0037] Further, 3-8 inclined holes are formed in the circular plate, and the distance from the left end center of each inclined hole to the left end center of the circular plate is equal; for any inclined hole, the axis of the inclined hole is located on the hole section corresponding to the inclined hole, the hole section passes through the left end center of the inclined hole and a certain adjacent inclined hole, and the hole section is parallel to the axis of the circular plate; the angle between the axis of the inclined hole and the axis of the circular plate in the projection line of the hole section is 20°-45°, and is preferably 30°; the angle affects the number of rotation circles of the gas flow around the flow column, and the inclined holes are inclined in the same direction, that is, all inclined clockwise or all inclined counterclockwise; when the number of inclined holes is even, the inclined holes are central symmetrical; through the above design, the inclined holes are inclined in the three-dimensional space, so that the cold and hot gas flows change the velocity direction after passing through the inclined holes.

[0038] Furthermore, the circular plate 21 is made as thin as possible while meeting the requirements of the inclined hole, so that the volume of the vortex structure is as small as possible.

[0039] Furthermore, the front circular plate 21 of the swirl structure 2 is chamfered 25 to facilitate the manufacturing process when it is transitionally fitted with the sleeve.

[0040] Furthermore, the flow area of ​​all the inclined holes should be approximately equal to the flow area of ​​the flow column to ensure the rotational speed and intensity of the mixed airflow.

[0041] Furthermore, the circular plate 21 and the flow column 23 are connected by a conical surface 22. Since the diameter of the flow column is large, the cross-sectional diameter of the conical surface 22 gradually increases from left to right, realizing the transition between the circular plate and the flow column.

[0042] Furthermore, the sleeve 3 is thinner, reducing its influence on the streamline of the mixed airflow; the outer diameter of the sleeve 3 is slightly smaller than the inner diameter of the mixing cavity, that is, a gap a is reserved between the outer wall of the sleeve 3 and the inner wall of the mixing cavity 1, with a value of 0.5 to 1 mm, to resist the thermal deformation caused by the high-temperature mixed airflow and prevent the mixing cavity from cracking after thermal expansion, making the swirling mixing structure safe, reliable and resistant to high temperature, while also making the swirling structure 2 easy to disassemble and assemble.

[0043] Furthermore, both the sleeve 3 and the swirl structure 2 are made of 45 steel, and the mixing cavity 1 is made of alumina ceramic casting.

[0044] When the gas swirl mixing device described above mixes hot and cold air streams, the hot air stream enters along the axis through the first gas inlet, while the cold air streams of different components enter obliquely through the second and third gas inlets. The cold air streams enter at an angle to the hot air streams, allowing the hot and cold air streams to undergo initial collision and mixing in the mixing zone. Subsequently, the velocity direction of the mixed gas changes as it passes through the oblique holes of the swirl structure and enters the swirl zone. In the swirl zone, the mixed air stream passing through the oblique holes has a forward-sloping velocity. The mixed gas rotates and moves forward at high speed around the flow column, prolonging the contact time between the hot and cold air streams. The collision between fluid micro-particles intensifies, and the mixed gas and the flow column work together to achieve passive stirring, ensuring sufficient contact and mixing of the hot and cold air streams. After passing through the swirl zone, the gas stream passes through the cavity narrowing and enters the flow equalization zone. The cavity narrowing makes the mixed air stream distribution compact and uniform, ultimately achieving the goal of thorough mixing and uniform temperature distribution.

[0045] The gas swirl mixing device of the present invention is applicable to mixed airflow conditions of 300k to 1500k; and is particularly suitable for generating total temperature signals. It can provide a stable and controllable high-temperature airflow through gas mixing. When temperature change is required, the temperature can be quickly changed by controlling the flow rate of cold gas.

[0046] The following are specific examples:

[0047] likeFigure 2 As shown, four oblique holes are provided on the circular plate. The axis of the oblique holes is located at a 45-degree CC section parallel to the central axis of the vortex structure (45 degrees means that a coordinate system is established with the center of the circular plate as the origin and the centers of the two oblique holes connected respectively as the x and y axes, and the CC section is at a 45-degree angle to the coordinate axes). The 45-degree angle can reduce the velocity loss during the airflow rotation process. The distance between the CC section and the central axis of the vortex structure is half the radius of the circular plate. On the CC section, the axis of the oblique holes is at a 30-degree angle to the horizontal straight line.

[0048] The hot gas flow is obtained by ionizing argon gas and passes through the first gas inlet at a fixed flow rate. Cold air and cold argon gas pass through the second and third gas inlets at fixed flow rates. After the hot gas flow, cold air and cold argon gas are initially impacted and mixed in the mixing zone, they pass through the inclined holes of the swirling structure and rotate forward around the flow column. After passing through the swirling zone, the cavity diameter becomes smaller. The circumferentially fully mixed gas flows inward, concentrates and impacts, and moves a distance in the flow equalization zone to achieve flow equalization. Finally, a well-mixed and uniformly heated mixed gas flow is obtained.

[0049] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An application of a gas swirling mixing device, characterized in that, A gas swirling mixer is used to generate a total temperature signal; the gas swirling mixer includes a mixing chamber (1), a swirling structure (2), and a sleeve (3), wherein: The swirling structure (2) is fixed in the mixing cavity (1) by the sleeve (3), dividing the mixing cavity (1) into a mixing zone, a swirling zone, and a uniform flow zone from left to right. The swirling structure (2) includes a fixedly connected circular plate (21) and a flow-encircling column (23). The circular plate (21) is transitionally fitted with the sleeve (3). The left side of the circular plate (21) is the mixing zone, which has several gas inlets. The left end of the mixing zone has a first gas inlet along the axis of the mixing cavity (1), and the side of the mixing zone has a second gas inlet inclined towards the first gas inlet. The circular plate (21) has several centrally symmetrical oblique holes. There is a gap between the flow-encircling column (23) and the sleeve (3), which is the swirling zone. The flow-equalizing zone is a constriction with a cross-sectional diameter that gradually decreases from left to right. The right end of the sleeve (3) contacts the left side of the constriction. The circular plate (21) and the flow-encircling column (23) are fixed by a conical surface (22), the cross-sectional diameter of which gradually increases from left to right. The outer diameter of the flow-encircling column (23) is 5 / 8 to 7 / 8 of the inner diameter of the sleeve (3), and the inside of the flow-encircling column (23) is hollow.

2. The application of the gas swirling mixing device as described in claim 1, characterized in that, There are 3 to 8 oblique holes in total, and the distance from the center of the left end of each oblique hole to the center of the left end of the circular plate is equal. For any oblique hole, the axis of the oblique hole is located on its corresponding hole cross section, the hole cross section passes through the center of the left end of the oblique hole and one of its adjacent oblique holes, and the hole cross section is parallel to the axis of the circular plate; the angle between the axis of the oblique hole and the axis of the circular plate on the projection line of the hole cross section is 20° to 45°.

3. The application of the gas swirling mixing device as described in claim 2, characterized in that, There are a total of 4 oblique holes, and the distance from the center of the left end of each oblique hole to the center of the left end of the circular plate is half the radius of the circular plate; for any oblique hole, the angle between the axis of the oblique hole and the axis of the circular plate on the projection line of the hole section is 30°.

4. The application of the gas swirling mixing device as described in claim 1, characterized in that, The flow area of ​​all the oblique holes on the circular plate (21) is equal to the flow area of ​​the gap between the flow column (23) and the sleeve (3).

5. The application of the gas swirling mixing device as described in claim 1, characterized in that, The gap between the outer side of the sleeve (3) and the inner side of the mixing cavity (1) is 0.5 mm to 1 mm.

6. The application of the gas swirling mixing device as described in claim 1, characterized in that, The mixing cavity (1) is made of alumina ceramic, and the swirling structure (2) and the sleeve (3) are made of 45 steel.

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