CN111760476A - Aeroengine high-altitude cabin gas mixing method and gas mixer based on Venturi tube - Google Patents
Aeroengine high-altitude cabin gas mixing method and gas mixer based on Venturi tube Download PDFInfo
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- CN111760476A CN111760476A CN202010594332.2A CN202010594332A CN111760476A CN 111760476 A CN111760476 A CN 111760476A CN 202010594332 A CN202010594332 A CN 202010594332A CN 111760476 A CN111760476 A CN 111760476A
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- venturi
- venturi tube
- mixer
- main pipe
- gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3123—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements
- B01F25/31232—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements used simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/23—Mixing of laboratory samples e.g. in preparation of analysing or testing properties of materials
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Accessories For Mixers (AREA)
Abstract
The invention belongs to the field of aeroengine test equipment, and relates to a venturi tube-based gas mixer and a gas mixing method. The gas mixer based on the Venturi tube comprises a main tube and branch tubes, wherein the branch tubes are uniformly arranged on the main tube in the circumferential direction through a plurality of connectors, the gas flow in the main tube is large, the total gas flow of the branch tubes is small, an annular static pressure cavity is arranged between the branch tubes and the main tube and used for enabling gas flow in the branch tubes to uniformly enter the mixer, a Venturi tube array is longitudinally arranged in the main tube of the mixer, the Venturi tube comprises a contraction section, a throat part and an expansion section, and the downstream of the throat part is disconnected from the expansion section. According to the invention, through the unique structural design of the Venturi tube, the influence of the mixer on the temperature uniformity of the main flow can be reduced, the air flow with uniform temperature field can be obtained, the gas mixing uniformity in the flow channel in the high-altitude cabin of the aircraft engine is improved, and the reliability and effectiveness of the test are improved.
Description
Technical Field
The invention belongs to the field of aeroengine test equipment, and relates to a venturi tube-based gas mixer and a gas mixing method.
Background
Aeroengine test equipment such as a high-altitude cabin needs to simulate the incoming flow temperature to change rapidly, and a gas mixing mode needs to be used for obtaining a faster temperature regulation speed. Meanwhile, the high-altitude cabin of the aircraft engine has high requirement on the uniformity of the temperature of incoming flow, and the mixing branch can influence the uniformity of the temperature of the airflow of the main path. In a limited pipeline length, the mixer is difficult to install, and the technical difficulty of designing the mixer in the prior art is how to reduce the influence of mixed airflow on the uniformity of the temperature of a main stream as much as possible.
Common mixer forms are SK type static mixers and central cannula bore radial jet mixers, etc. For example, an SK type static mixer commonly used in the chemical field adopts a twisted spiral plate structure, airflow with the unevenness of 1% -5% can be obtained at the position 10-25 times of the diameter of the downstream of an outlet of the mixer, and the SK type static mixer is not suitable for a structure with the limited length of a front chamber of a high-altitude cabin.
A gas mixing pipeline of a NASA PSL-4 test chamber of a foreign high-altitude chamber adopts radial jet flow with a central cannula and an opening, and the structure has the mechanism of poor temperature uniformity.
The foreign AEDC J-2 high-altitude cabin arranges the Venturi tube in a main flow pipeline, mainly uses the critical Venturi tube for measuring the flow in the pipeline, and is not used for improving the temperature uniformity in the mixing pipeline, and the conventional Venturi mixer in the prior art is mainly used for a single pipeline and can not solve the problem of the temperature uniformity in the mixing pipeline.
Disclosure of Invention
The purpose of the invention is: the utility model provides a gas mixer based on venturi, in limited pipeline length, reasonable design gas mixer form effectively reduces the mixed gas stream and to the influence of mainstream temperature homogeneity.
In addition, a gas mixing method of the engine high-altitude chamber is also provided.
The technical scheme of the invention is as follows: the gas mixer based on the Venturi tube comprises a main tube 1 and branch tubes 2, wherein the branch tubes 2 are uniformly arranged on the main tube 1 in the circumferential direction through a plurality of connectors, the gas flow in the main tube is large, the total gas flow of the branch tubes is small, an annular static pressure cavity 3 is arranged between the branch tubes and the main tube and used for enabling gas flow in the branch tubes to uniformly enter the mixer, a Venturi tube array is longitudinally arranged in the main tube of the mixer, the Venturi tube comprises a contraction section, a throat part and an expansion section, the downstream of the throat part 8 is disconnected from the expansion section, and after the gas flow in the main tube is accelerated through the contraction section of the Venturi tube, the gas flow speed of the main tube passing through the throat part is larger than that.
The axial length of the throat part 8 in a broken state is about 0.5-1.5 times of the diameter of the throat part.
The venturi tubes are evenly arranged in the main pipe in a staggered mode to form a venturi tube array, and the venturi tubes are welded on the upstream baffle and the downstream baffle.
The upstream baffle 5 and the downstream baffle 6 are circular orifice plates, the orifice plates are used for installing a Venturi tube, and the upstream baffle 5 and the downstream baffle 6 are connected with the inner wall of the main tube in a welded mode.
The curve of the contraction section (7) is a circular arc, a Vickers curve, a bicubic curve or a quintic curve.
The angle of divergence of the divergent section 9 is 10-15 degrees, preferably 12 degrees.
The number of the branch pipes 2 of the mixer is 2-6, and the preferred number is 4.
The axis of the branch pipe 2 and the symmetrical plane of the mixer form a certain included angle.
The static pressure cavity is an annular cavity.
The aeroengine high-altitude cabin gas mixing method is characterized in that the venturi tube-based gas mixer is installed in a high-altitude cabin front chamber pipeline, an upstream baffle and a downstream baffle are arranged at the inlet and the outlet of the venturi tube, main pipe gas flow can only enter the mixer from the contraction section of the venturi tube, the throat 8 of the venturi tube is disconnected, branch pipe gas flow enters the mixer from the throat, the main pipe gas flow is accelerated and depressurized at the contraction section 7 of the venturi tube so as to inject the branch pipe gas flow into the venturi tube, and the main pipe gas flow and the branch pipe gas flow are fully mixed in the throat 8 and the expansion section 9.
The invention has the advantages that: according to the invention, through the unique structural design of the Venturi tube, the influence of the mixer on the temperature uniformity of the main flow can be reduced, and the airflow with uniform temperature field can be obtained for an aeroengine test. The temperature non-uniformity, defined as the ratio of the difference between the highest and lowest temperatures of the outlet cross-section of the calculation field to the average temperature of the mass of the cross-section, can be found to be less than 1% by CFD calculation. Therefore, the invention can provide effective technical support for the design of the air supply pipeline of the high-altitude cabin, the test vehicle and the propulsion wind tunnel of the aircraft engine, and has greater practical application value.
Drawings
FIG. 1 is a front view of a venturi mixer configuration;
FIG. 2 is a cross-sectional view of the venturi mixer configuration;
FIG. 3 is a schematic view of the venturi;
in the context of the upstream baffle of figure 4,
wherein, 1, a main pipe; 2. a branch pipe; 3. a static pressure chamber; 4. a venturi tube; 5. an upstream baffle; 6. a downstream baffle; 7. a contraction section; 8. a throat; 9. and (4) an expansion section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings and specific embodiments. Certain features that are well known to those skilled in the art have been omitted from the following description for the sake of simplicity.
Referring to fig. 1 and 2 together, the venturi-based gas mixer of the present invention includes a main pipe 1 and branch pipes 2. Wherein, the branch pipes 2 are evenly arranged on the main pipe 1 in the circumferential direction of a plurality of joints. The gas flow in the main pipe is large, and the total gas flow of the branch pipes is small. An annular static pressure cavity 3 is arranged between the branch pipe and the main pipe and is used for enabling airflow in the branch pipe to uniformly enter the mixer.
The number of the mixer branch pipes 2 is 2-6, and the preferred number is 4. The included angle of 2 axis of branch pipe and blender planes of symmetry can be according to venturi's the adjustment of arranging, and the included angle scope is 10 ~ 30, preferred 22, can effectively avoid the branch pipe air current to directly strike venturi through angle change to reduce resistance loss and the pipeline vibration that the branch pipe air current got into the person in charge.
A plurality of venturi tubes are arranged in the mixer main pipe. The air flow temperature uniformity after mixing is poor when the number of the Venturi tubes in the mixer main pipe is too small, the processing and manufacturing difficulty is increased when the number of the Venturi tubes is too large, and the number range of the Venturi tubes is generally 50-100 aiming at the rectification chamber of the engine high-altitude cabin with the diameter of 3-5 m. The venturi tubes are uniformly arranged in the main pipe in a staggered mode, so that resistance loss of branch pipe airflow entering the main pipe is reduced, and the branch pipe airflow can reach the center of the main pipe.
The venturi pipe welds on upstream baffle 5 and low reaches baffle 6, upstream and low reaches baffle is the hole array design for the fixed venturi of centre gripping blocks the gas that gets into the clearance simultaneously. During specific implementation, upstream baffle 5 and downstream baffle 6 are circular orifice plate, and trompil department is used for installing venturi, then fixed the setting in being responsible for, adopt the welding mode can reduce the pipeline vibration, stable in structure. Wherein, the upstream baffle 5 is arranged at the inlet of the Venturi tube, and the main air flow can only enter the Venturi tube from the contraction section of the Venturi tube and can not enter a downstream pipeline from a gap between the Venturi tubes. The downstream baffle 6 is arranged at the outlet of the venturi tube, and the mixed airflow can only enter the downstream of the main pipe from the outlet of the venturi tube and cannot enter a downstream pipeline from a gap between the venturi tubes.
Referring to fig. 2, the venturi tube includes a contraction section, a throat section and an expansion section, the contraction section is welded at the opening of the upstream baffle 5, the expansion section is welded at the opening of the downstream baffle, and the throat section is located between the upstream baffle and the downstream baffle. The optimized parameter of the contraction section 7 of the Venturi tube 4 is that the curve is an arc, the adoption of an arc structure form is simple, the processing is convenient, the contraction section 7 can adopt the forms of a Vickers curve, a bicubic curve, a quintic curve and the like, and the uniformity of the airflow at the outlet of the contraction section 7 is improved. The contraction ratio of the contraction section is 2-4, the air flow speed of the throat part is improved by reducing the flow area, the air injection effect is formed, and the contraction ratio is not too large so as to reduce the air flow resistance loss and the pipeline vibration. The angle of the expansion section 9 is 10-15 degrees, preferably 12 degrees, so that the gas mixing uniformity is effectively improved in the expansion process. The invention is different from the structural form of the conventional Venturi tube in the prior art, the Venturi tube is creatively disconnected from the downstream of the throat part 8 to the expansion section as a drainage port for gas mixing, the initial position of the disconnection of the throat part 8 is 0.05-0.1 times of the diameter of the throat part at the downstream of the minimum diameter of the throat part, and the main flow gas velocity is maximum at the disconnection position. The axial length of the throat 8 in the break-off state is about 0.5 to 1.5 times the diameter of the throat. The short breaking length is not favorable for forming the injection effect; if the cutoff length is too long, the main pipe gas flow is easy to diffuse, and the gas flow loss is increased. In addition, the diameter of the inlet of the expansion section is larger than that of the throat, so that the main pipe can conveniently inject branch pipe airflow into the Venturi tube 4. The main pipe air flow is accelerated and depressurized at the contraction section of the Venturi tube, so that the branch pipe air flow is injected to enter the Venturi tube, the main pipe air flow and the branch pipe air flow are fully mixed at the throat part and the expansion section, and the gas uniformity of the engine high-altitude cabin air supply pipeline is effectively improved.
In addition, a venturi-based gas mixer as described above is provided inside the engine nacelle. During actual operation, mixer pipeline circumference sets up the static pressure chamber and makes a plurality of air feed branch air currents get into the blender uniformly, simultaneously because a plurality of venturi that use throat disconnection arrange the main pipe in, the main pipe air current draws the branch air current to penetrate to venturi 4 in, the main pipe air current is reduced pressure with higher speed at venturi contraction section, thereby draw and penetrate branch air current and get into venturi, be responsible for the air current and carry out intensive mixing with the branch air current at throat and expansion section, effectively improve the gas homogeneity of engine high-altitude cabin air feed pipe. The pressure of the main pipe airflow of the air inlet mixer is basically equal to that of the branch pipe airflow, generally 0.3-0.5 MPa, namely equal-pressure mixing is carried out, meanwhile, the main pipe airflow is contracted and accelerated through a Venturi tube, the speed of the main pipe airflow is higher than that of the branch pipe airflow, in a certain embodiment, the speed of the main pipe airflow is higher than that of the branch pipe airflow by 30%, and a better air injection effect is formed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The venturi tube-based gas mixer is characterized by comprising a main pipe (1) and branch pipes (2), wherein the branch pipes (2) are circumferentially and uniformly arranged on the main pipe (1) through a plurality of connectors, the flow rate of gas in the main pipe is large, the total flow rate of gas in the branch pipes is small, a cavity is arranged between each branch pipe and the main pipe, used for enabling air flow in the branch pipe to uniformly enter the mixer, an upstream baffle, a downstream baffle and a plurality of venturi tubes are arranged in the main pipe of the mixer, each venturi tube comprises a contraction section, a throat part and an expansion section, wherein the convergent section is disposed at the upstream baffle, the divergent section is disposed at the downstream baffle, and the throat (8) is located between the upstream and downstream baffles, and is communicated with the cavity, and the downstream of the throat part is disconnected with the expansion section, after the air flow of the main pipe is accelerated by the contraction section of the Venturi tube, the main pipe air flow speed through the throat part is larger than the branch pipe air flow speed, so that the branch pipe air flow is ejected.
2. A venturi-based gas mixer according to claim 1, characterized in that the axial length of the throat (8) break-off is about 0.5-1.5 times the throat diameter.
3. The venturi-based gas mixer of claim 1, wherein the venturis are staggered and uniformly arranged within the main pipe to form an array of venturis, and the venturis are welded to the upstream and downstream baffles.
4. A venturi tube based gas mixer according to claim 3, characterized in that the upstream baffle (5) and the downstream baffle (6) are circular orifice plates for venturi tube installation, and the upstream baffle (5) and the downstream baffle (6) are welded to the inner wall of the main pipe.
5. A venturi-based gas mixer according to claim 1, characterized in that the convergent (7) curve is a circular arc, a vickers curve, a bicubic curve or a quintic curve.
6. A venturi-based gas mixer according to claim 1, characterized in that the divergent section (9) has a divergence angle of 10-15 °, preferably 12 °.
7. A venturi-based gas mixer according to claim 1, characterized in that the number of mixer branch pipes (2) is 2-6, preferably 4.
8. A venturi-based gas mixer according to claim 1, characterized in that the branch pipe (2) axis is at an angle to the mixer symmetry plane.
9. A venturi-based gas mixer according to claim 1, characterized in that the cavity is an annular hydrostatic cavity (3).
10. The aeroengine high-altitude cabin gas mixing method is characterized in that the venturi tube-based gas mixer is installed in the high-altitude cabin front chamber pipeline, the main pipe gas flow can only enter the gas mixer from the venturi tube contraction section (7), the venturi tube throat (8) is disconnected, the branch pipe gas flow enters the gas mixer from the throat, the main pipe gas flow is accelerated and depressurized in the venturi tube contraction section (7) so as to inject the branch pipe gas flow into the venturi tube, and the main pipe gas flow and the branch pipe gas flow are fully mixed in the throat section (8) and the expansion section (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010594332.2A CN111760476A (en) | 2020-06-24 | 2020-06-24 | Aeroengine high-altitude cabin gas mixing method and gas mixer based on Venturi tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010594332.2A CN111760476A (en) | 2020-06-24 | 2020-06-24 | Aeroengine high-altitude cabin gas mixing method and gas mixer based on Venturi tube |
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| Publication Number | Publication Date |
|---|---|
| CN111760476A true CN111760476A (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010594332.2A Pending CN111760476A (en) | 2020-06-24 | 2020-06-24 | Aeroengine high-altitude cabin gas mixing method and gas mixer based on Venturi tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113439514A (en) * | 2021-07-12 | 2021-09-28 | 中国农业大学 | Venturi fertilizer applicator and fertilizing equipment |
| CN113786745A (en) * | 2021-09-24 | 2021-12-14 | 湖南有色金属职业技术学院 | Venturi type propylene chlorine mixer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1078092B (en) * | 1953-01-31 | 1960-03-24 | Sulzer Ag | Method for mixing a gas with a liquid |
| KR101078025B1 (en) * | 2011-04-20 | 2011-10-31 | 주식회사 백광아이에스티 | Vacuum control type ejector |
| CN103111214A (en) * | 2013-02-04 | 2013-05-22 | 西安交通大学 | Novel venturi mixer |
| CN106110921A (en) * | 2016-08-01 | 2016-11-16 | 华电水务工程有限公司 | A kind of venturi mixer of two-way injection |
| DE102017119549A1 (en) * | 2016-08-29 | 2018-03-01 | Ford Global Technologies, Llc | SYSTEMS AND METHOD FOR AN EXHAUST GAS RECYCLING MIXER |
| CN110865664A (en) * | 2019-12-13 | 2020-03-06 | 湖南汉能科技有限公司 | Rapid pressure adjusting device for high-altitude cabin of turbofan engine test bed |
-
2020
- 2020-06-24 CN CN202010594332.2A patent/CN111760476A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1078092B (en) * | 1953-01-31 | 1960-03-24 | Sulzer Ag | Method for mixing a gas with a liquid |
| KR101078025B1 (en) * | 2011-04-20 | 2011-10-31 | 주식회사 백광아이에스티 | Vacuum control type ejector |
| CN103111214A (en) * | 2013-02-04 | 2013-05-22 | 西安交通大学 | Novel venturi mixer |
| CN106110921A (en) * | 2016-08-01 | 2016-11-16 | 华电水务工程有限公司 | A kind of venturi mixer of two-way injection |
| DE102017119549A1 (en) * | 2016-08-29 | 2018-03-01 | Ford Global Technologies, Llc | SYSTEMS AND METHOD FOR AN EXHAUST GAS RECYCLING MIXER |
| CN110865664A (en) * | 2019-12-13 | 2020-03-06 | 湖南汉能科技有限公司 | Rapid pressure adjusting device for high-altitude cabin of turbofan engine test bed |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113439514A (en) * | 2021-07-12 | 2021-09-28 | 中国农业大学 | Venturi fertilizer applicator and fertilizing equipment |
| CN113786745A (en) * | 2021-09-24 | 2021-12-14 | 湖南有色金属职业技术学院 | Venturi type propylene chlorine mixer |
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Application publication date: 20201013 |