WO2023103809A1

WO2023103809A1 - Bidirectional swirl mixing device for air source system heat exchanger

Info

Publication number: WO2023103809A1
Application number: PCT/CN2022/134242
Authority: WO
Inventors: 刘嘉诚; 蒋亮亮; 潘舜智; 刘华源; 王磊; 南国鹏
Original assignee: 中国商用飞机有限责任公司; 中国商用飞机有限责任公司上海飞机设计研究院
Priority date: 2021-12-10
Filing date: 2022-11-25
Publication date: 2023-06-15
Also published as: CN114180070A

Abstract

A bidirectional swirl mixing device for an air source system heat exchanger of an aircraft, comprising an outer sleeve (20) and an inner sleeve (40). The inner sleeve (40) is arranged within the outer sleeve (20) and the two sleeves are spaced apart from each other. The mixing device further comprises: multiple outer ring stator blades (30) which are spaced apart and fixedly connected to the inner wall surface of the outer sleeve (20) and the outer wall surface of the inner sleeve (40); and multiple inner ring stator blades (50), which are spaced apart and fixedly connected to the inner wall surface of the inner sleeve (40). The outer ring stator blades (30) and the inner ring stator blades (50) are arranged at different angles relative to the longitudinal axis of the inner sleeve (40). When the outer ring blades and the inner ring blades incline in opposite directions relative to the longitudinal direction, the bidirectional swirl mixing device can enable airflow passing through the inner ring blades and the outer ring blades to rotate in opposite directions, so that the two strands of airflow are wound and mixed, and the temperature field is quickly and efficiently homogenized.

Description

Two-way swirl mixing device for heat exchanger of air supply system

technical field

The invention relates to an aircraft environment control system, in particular to a two-way swirling flow mixing device used for a precooler of an air source system in the environment control system.

Background technique

The environmental control system of modern aircraft is mainly used to control the internal environment of the aircraft. It can provide ventilation for systems such as avionics, fuel and hydraulic systems, and also provide anti-icing and anti-fog functions for the aircraft.

The civil aircraft environmental control system has a pre-cooling heat exchanger, which is used to cool the high-temperature bleed air of the engine, so as to meet the requirements of the downstream air conditioning, anti-icing, fuel tank inerting and other systems for the bleed air temperature. Usually, a temperature sensor is arranged downstream of the outlet of the hot side of the precooler for closed-loop control of the cold side flow of the precooler and adjustment of the outlet temperature of the hot side. The precooler is a typical cross-flow plate-fin heat exchanger, which can be divided into heat exchange core and head. The air flow realizes heat exchange in the heat exchange core, and the head connects the heat exchange core and the upstream and downstream pipelines. connected. However, the existing precooler will have obvious temperature stratification at the outlet head. Under typical working conditions, the temperature difference exceeds 200°C, resulting in significant deviations in the temperature of the gas flowing downstream into the air conditioner and on both sides of the wing anti-icing, which seriously affects the distribution of outlet airflow and the measurement of temperature control targets, and even causes the anti-icing or air-conditioning system to fail to meet expectations performance.

The temperature difference at the outlet of the precooler leads to great uncertainty in the bleed air temperature of the wing anti-icing system, which seriously affects the temperature control of the anti-icing system. Therefore, it is necessary to improve the uniformity of the downstream temperature field through a mixing device.

In order to reduce the impact caused by the temperature stratification difference at the outlet of the hot side of the precooler, a swirl device is installed at the outlet of the hot side of the precooler. The configuration of a conventional swirler is shown in FIG. 7 . The swirl device has an outer sleeve, blades extending inward from the outer sleeve, and an inner sleeve connected to the center of the blades. After the gas passes through the cyclone device, rotational mixing is generated. However, it is actually found that the airflow rotating in a single direction will lead to greater uncertainty in the temperature on both sides of the air conditioner and anti-icing. And the distance from the outlet of the precooler to the branch of the downstream pipeline is short, so the air mixing device must have higher heat exchange efficiency to ensure the same temperature on both sides of the air conditioner and anti-icing.

Contents of the invention

In order to overcome the deficiencies in the prior art, the present invention provides a two-way swirl mixing device for heat exchangers of aircraft air supply systems, the swirl mixing device includes an outer sleeve, and the outer sleeve includes an attachment To the front end of the air source system precooler and the rear end attached to the downstream pipeline; the bidirectional swirl mixing device further includes: an inner sleeve, the inner sleeve is located inside the outer sleeve, And the inner sleeve is spaced apart from the outer sleeve; a plurality of outer ring stator blades, the plurality of outer ring stator blades are spaced apart from each other and fixedly connected to the inner wall surface of the outer sleeve and the inner sleeve an outer wall surface of the barrel; and a plurality of inner stator blades spaced from each other and fixedly connected to the inner wall surface of the inner sleeve; wherein the outer stator blades and the inner stator blades The vanes are arranged at different angles with respect to the longitudinal axis of the inner sleeve.

According to an aspect of the present invention, the outer ring stator blades and the inner ring stator blades are arranged obliquely at opposite angles with respect to the longitudinal axis, so that passing between the inner sleeve and the outer sleeve The outer ring airflow and the inner airflow through the space of the inner sleeve rotate in opposite directions.

According to another aspect of the present invention, 4-12 stator blades of the outer ring are arranged between the outer sleeve and the inner sleeve, and 4-12 stator blades are arranged on the inner surface of the inner sleeve. one of the inner ring stator blades. Preferably, the outer sleeve and the inner sleeve are provided with 5 outer ring stator blades, and the inner surface of the inner sleeve is provided with 8 inner ring stator blades.

According to still another aspect of the present invention, the outer sleeve and the inner sleeve are substantially cylindrical, the outer sleeve and the inner sleeve are arranged centered on the same longitudinal axis, and in the direction of the longitudinal axis Above, the length of the inner sleeve does not exceed the length of the outer sleeve.

According to still another aspect of the present invention, the number of the stator blades of the outer ring is less than that of the stator blades of the inner ring, and/or the length of the stator blades of the outer ring is equivalent to the length of the stator blades of the inner ring.

According to yet another aspect of the present invention, the inner sleeve has a proximal end and a distal end, and each of the outer stator vanes and the inner stator vanes extends from the proximal end of the inner sleeve to The distal end of the inner sleeve.

According to still another aspect of the present invention, the outer sleeve includes a front end attached to the heat exchanger of the air source system and a rear end attached to the downstream pipeline, wherein the front end is provided with a flange edge, and the flange The edge forms a recess, which is suitable for packing the sealing ring.

According to another aspect of the present invention, the outer wall surface of the rear end of the two-way swirl mixing device is provided with a radially inwardly contracting chamfer, and the outer wall surface of the rotating device is designed to form a stepped portion.

According to still another aspect of the present invention, the outer sleeve, the inner sleeve, the outer stator blades and the inner stator blades are formed as a single piece. Preferably, the integral part is formed by 3D printing.

Adopt the two-way swirl flow mixing device according to the present invention, when the air flow passes through the mixing device, it will be divided into an outer ring air flow and an inner ring air flow by the inner sleeve. In particular, when the outer ring blades and the inner ring blades are inclined in opposite directions relative to the longitudinal direction, the two-way swirl mixing device can generate airflows in opposite rotation directions, so that the two airflows are intertwined and mixed to achieve rapid and efficient The purpose of homogenizing the temperature field. Thus effectively solving the temperature control problem caused by the non-uniform temperature field.

Description of drawings

For a more complete understanding of the present invention, the following description of exemplary embodiments may be considered by reference to the accompanying drawings, in which:

Fig. 1 shows a perspective view of a swirl mixing device according to a preferred embodiment of the present invention.

Fig. 2 shows a side view of a swirl mixing device according to a preferred embodiment of the present invention.

Figure 3 shows an end view of a swirl mixing device according to a preferred embodiment of the present invention.

Fig. 4 shows an exploded perspective view of a partial system of a swirl mixing device installed downstream of a heat exchanger for an air supply system according to a preferred embodiment of the present invention.

Fig. 5 shows a schematic diagram of a three-dimensional simulation temperature field distribution of a pipeline installed with a swirl mixing device according to a preferred embodiment of the present invention.

Fig. 6 shows a comparison table of the laboratory test results of the temperature difference between the downstream anti-icing and air conditioning system using the swirl mixing device according to the preferred embodiment of the present invention and using the original configuration without the mixing device.

Fig. 7 shows a perspective view of a swirl mixing device in the prior art.

List of reference signs

10 two-way swirl mixing device

20 sleeves

21 front end

22 backend

23 Flange

25 steps

30 Outer ring stator blades

40 inner sleeve

50 inner ring stator blades

60 export head

71 sliding sleeve

72 downstream pipeline

A longitudinal axis

Detailed ways

The present invention will be further described below in conjunction with specific embodiment and accompanying drawing, set forth more details in the following description so as to fully understand the present invention, but the present invention can obviously be implemented in many other ways different from this description, Those skilled in the art can make similar promotions and deductions based on actual application situations without violating the connotation of the present invention, so the content of this specific embodiment should not limit the protection scope of the present invention.

In the following description, upstream and downstream refer to the flow direction of the airflow from the precooler to the downstream pipeline, the front side/front end refers to the side or end near the precooler, and the rear side/rear end refers to the side near the downstream The side or end of a pipe, unless otherwise characterized.

Fig. 1, Fig. 2 and Fig. 3 respectively show the perspective view, the side view and the end view of the two-way swirl mixing device 10 according to the preferred embodiment of the present invention, this two-way swirl mixing device 10 is usually used to be connected to the ring of civil aircraft On the outlet head 60 of the heat exchanger (not shown) of the control system. In particular, the two-way swirl mixing device 10 is configured to divide the airflow passing through it into two inner and outer airflows with opposite rotation directions, so that the airflows are "entwined" and mixed with each other, so as to improve the mixing effect on the airflows and enhance the uniformity of the downstream temperature. sex.

Specifically, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the two-way swirl mixing device 10 includes an outer sleeve 20 and an inner sleeve 40 located inside the outer sleeve 20 .

The outer sleeve 20 of the mixing device 10 is configured as the outer casing of the two-way swirl mixing device 10, which includes a front end 21 that can be attached to the outlet head 60 of the air source system precooler and a rear end that is attached to the downstream pipeline twenty two. The inner sleeve 40 of the mixing device 10 is inside the outer sleeve 20 , and the inner sleeve 40 is spaced apart from the outer sleeve 20 . In the preferred embodiment, both the outer sleeve 20 and the inner sleeve 40 are cylindrical and are preferably co-located with the longitudinal central axis A. As shown in FIG.

Further, the two-way swirl mixing device 10 also includes a plurality of outer stator blades 30 and a plurality of inner stator blades 50 .

A plurality of outer ring stator blades 30 are spaced apart and fixedly connected to the inner wall surface of the outer sleeve 20 and the outer wall surface of the inner sleeve 40, so that the inner and outer edges of each outer ring stator blade 30 are fixedly connected , so that each outer ring stator blade 30 bridges between the inner wall surface of the outer sleeve 20 and the outer wall surface of the inner sleeve 40 . It can be understood that the outer ring stator plays a role of supporting the inner sleeve 40 .

As can be seen in Figure 3, the bi-directional swirl mixing device 10 of the preferred embodiment has five outer ring stator vanes 30. The five outer ring stator blades 30 are arranged obliquely in the same direction with respect to the longitudinal axis A, and are equally spaced apart from each other, that is, the distance between two adjacent outer ring stator blades 30 is 72°.

A plurality of inner ring stator blades 50 are fixed to the inner wall surface of the inner sleeve 40 spaced apart from each other. Each inner ring stator blade 50 extends from the inner wall of the inner sleeve 40 facing the central longitudinal axis A of the

sleeve

20 , 40 such that each inner ring stator blade 50 is suspended from the inner wall surface of the inner sleeve 40 . In this way, the outer edge of each inner ring stator blade 50 is fixedly connected to the inner wall surface of the inner sleeve 40, while the inner edge of each inner ring stator blade 50 forms a free end. The radial distance of the free ends of the inner ring stator vanes 50 from the longitudinal axis A may be approximately ½ of the inner sleeve 40 .

It can also be seen in FIG. 3 that the bi-directional swirl mixing device 10 of the preferred embodiment has eight inner ring stator vanes 50 . The eight inner-ring stator blades 50 are arranged obliquely in the same direction relative to the longitudinal axis, and are equally spaced apart from each other, that is, the distance between two adjacent inner-ring stator blades 50 is 45 degrees.

It should be understood that the number of the inner stator blades 50 and the outer stator blades 30 is not limited to the preferred embodiment, and can be selected within the range of 4-12 according to the optimal design scheme.

It can be seen from FIG. 1 that, in particular, the outer ring stator blades 30 and the inner ring stator blades 50 are arranged in opposite oblique directions with respect to the longitudinal axis A, so that the outer ring passing between the inner sleeve 40 and the outer sleeve 20 The coil airflow and the internal airflow through the space of the inner sleeve 40 rotate in opposite directions.

In a preferred embodiment, if the rear edge of the outer stator vanes 30 is offset counterclockwise with respect to its front edge, the rear edge of the inner stator vane is offset clockwise with respect to its front edge, so that, in In the space formed between the inner sleeve 40 and the outer sleeve 20, the outer ring airflow forms a counterclockwise cyclone under the action of the outer ring stator blades 30, while the inner ring airflow passing through the center of the inner sleeve 40 is circled inside. Under the action of the sub-blades 50, a clockwise rotating cyclone is formed, so that after leaving the mixing device 10, the two airflows will be intertwined and mixed in the downstream pipeline, so as to achieve the purpose of making the temperature of the airflow uniform.

In addition, in the bidirectional swirl mixing device 10 of the preferred embodiment, the length of the inner sleeve 40 in the direction of the longitudinal axis does not exceed the length of the outer sleeve 20, while the outer ring stator blades 30 and the inner ring stator blades 50 are longitudinally The directional length may be comparable to the length of the inner sleeve 40 , ie, each of the outer ring stator vanes 30 and the inner ring stator blades 50 extends from the proximal end of the inner sleeve 40 to the distal end of the inner sleeve 40 .

Furthermore, in order to attach the front end 21 of the cylindrical outer sleeve 20 to the heat exchanger of the gas supply system, a flange 23 is provided at the front end 21 of the mixing device 10, which is configured to exchange heat with the The outlet edge of the outlet head 60 of the device is butted. A circle of recesses is formed along the flange edge 23 of the two-way swirl mixing device 10, and the recess is used to fill the sealing ring. When the outlet edge is inserted into the recess of the flange edge 23, the sealing ring is filled on the flange edge 23. and the outlet edge, thereby forming a good seal to prevent the airflow flowing out of the heat exchanger outlet head 60 from overflowing.

The outer wall surface of the rear end 22 of the outer sleeve 20 is preferably provided with a radially inwardly contracting chamfer. Preferably, during installation, the rear end 22 of the outer sleeve 20 of the two-way swirl mixing device 10 is inserted into the sliding sleeve 71 , and the chamfered portion will facilitate the insertion of the sliding sleeve 71 connected to the downstream pipeline 72 .

As shown in Figure 2, the outer wall surface of the outer sleeve 20 is provided with a step portion 25, like this, when the distal end of the outer sleeve 20 is inserted into the sliding sleeve, the port of the downstream pipeline will abut on the step portion 25, thereby The step 25 serves as a stop for the downstream line.

According to the two-way rotating mixing device 10 of the present invention, the outer sleeve 20 , the inner sleeve 40 , the outer stator blades 50 and the inner stator blades 30 are formed as a single piece. The integral part can be integrally formed by machining, or can be integrally formed by 3D printing.

Preferably, the bidirectional mixing device 10 according to the present invention may include the following settable variables: the number of inner and outer

ring stator blades

30, 50, the inclination angle of the inner and outer

ring stator blades

30, 50 relative to the longitudinal direction, the inner and outer

ring stator blades

30, 50 in the radial direction of the sleeve, the overall deflection angle of the inner and outer

ring stator vanes

30, 50 relative to the central axis, etc. The parameters of the above-mentioned set variables can be set according to the improvement of the temperature uniformity of the downstream section of the two-way swirl mixing device 10, the reduction of flow resistance, the reduction of the temperature difference between the two sides of the air conditioner and anti-icing, etc., so that through the multi-objective three-dimensional flow field Automated optimization methods determine configurations that achieve the goal.

The effect of using the two-way swirl mixing device 10 according to the present invention to mix the air flow passing through it to make the temperature uniform is very remarkable.

The inventors conducted simulations and experiments on the influence of the bidirectional swirl mixing device 10 of the present invention on the distribution of the temperature field in a preferred embodiment by means of three-dimensional simulation. The simulation results of the three-dimensional flow field temperature field show that the two-way swirl mixing device 10 significantly improves the uniformity of the downstream temperature field within a short distance of less than 0.5m. After the two-way swirl mixing device 10 is installed upstream of the main pipeline bifurcation, the maximum temperature difference in the front section of the main pipeline bifurcation is reduced from 192°C to 38°C, thereby ensuring air conditioning (left branch in Figure 5) and anti-icing (right branch in Figure 5 ) The system bleed temperature difference is less than 3°C under different working conditions.

Fig. 6 shows the laboratory test comparison results of the temperature difference between the anti-icing system and the air conditioning system before and after the installation of the two-way swirl mixing device 10 according to the present invention under six different typical working conditions. It can be seen from Figure 6 that under these six typical working conditions, before installing the two-way swirl mixing device, the temperature difference between the two downstream systems exceeded 15°C, and the maximum temperature difference even exceeded 30°C. After installing the two-way swirl mixing device 10, the temperature difference between the anti-icing system and the air-conditioning system is kept within 2.2°C. It can be seen that the temperature uniformity of the downstream systems has been significantly improved.

While significantly increasing the temperature uniformity, the two-way mixing device 10 minimizes the flow resistance as much as possible. In experiments, it is found that the flow resistance after the two-way mixing device 10 is adopted is more obvious than that of the unidirectional swirl mixing device shown in Fig. 7 reduce.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention, all fall within the scope of protection defined by the claims of the present invention.

Claims

A two-way swirl mixing device for a heat exchanger of an aircraft air source system, the swirl mixing device includes an outer sleeve, and the outer sleeve includes a front end attached to the precooler of the air source system and an attached connected to the rear end of the downstream pipeline;

It is characterized in that,

The swirl mixing device further comprises:

an inner sleeve positioned within the outer sleeve and spaced apart from the outer sleeve;

a plurality of outer ring stator blades fixedly connected to the inner wall surface of the outer sleeve and the outer wall surface of the inner sleeve spaced apart from each other; and

A plurality of inner ring stator blades, the plurality of inner ring stator blades are spaced apart from each other and fixedly connected to the inner wall surface of the inner sleeve;

Wherein the outer ring stator blades and the inner ring stator blades are arranged at different angles with respect to the longitudinal axis of the inner sleeve.
The bi-directional swirl mixing device according to claim 1, wherein said outer stator blades and said inner stator blades are arranged at opposite angles with respect to said longitudinal axis, so that through said inner sleeve The outer ring airflow between the outer sleeve and the inner airflow through the space of the inner sleeve rotate in opposite directions.
The two-way swirl mixing device according to claim 1, wherein 4-12 stator blades of the outer ring are arranged between the outer sleeve and the inner sleeve, and the inner sleeve of the inner sleeve There are 4-12 said inner ring stator vanes on the surface.
The two-way swirl mixing device according to claim 1, wherein the outer sleeve and the inner sleeve are substantially cylindrical, and the outer sleeve and the inner sleeve are centered on the same longitudinal axis Arranged such that, in the direction of the longitudinal axis, the length of the inner sleeve does not exceed the length of the outer sleeve.
The two-way swirl mixing device according to claim 1, wherein the number of the outer stator blades is less than the number of the inner stator blades, and/or

The length of the outer ring stator vanes in the longitudinal direction is equal to the length of the inner ring stator blades.
The two-way swirl mixing device according to claim 4, wherein said inner sleeve has a proximal end and a distal end, and each of said outer stator blades and said inner stator blades The proximal end of the sleeve extends to the distal end of the inner sleeve.
The two-way swirl mixing device according to claim 1, wherein the outer sleeve includes a front end attached to the heat exchanger of the air source system and a rear end attached to the downstream pipeline, wherein the front end A flange edge is provided, and the flange edge forms a recess, and the recess is suitable for filling the sealing ring.
The two-way swirl mixing device according to claim 1, characterized in that, the outer wall surface of the rear end of the two-way swirl mixing device is provided with a radially inward contracting chamfer, and the swirl device The outer wall surface is designed to form a stepped portion.
The two-way swirl mixing device according to claim 1, wherein the outer sleeve, the inner sleeve, the outer stator vanes and the inner stator vanes are formed as a single piece.
The two-way swirl mixing device according to claim 9, characterized in that, the integral part is formed by 3D printing.