A multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct

Abstract

This application belongs to the technical field of jet pre-cooling for aero-engines, and particularly relates to a multi-channel jet pre-cooling atomizing spray bar adapted to a circular intake duct. The spray bar includes: a spray bar base and a spray pipe. Among them, three spray pipes are arranged in parallel on the spray bar base. A water supply channel is provided inside the spray pipe. A plurality of groups of small-hole direct injection nozzles communicating with the water supply channel are opened on the spray pipe. Each group includes two relatively arranged small-hole direct injection nozzles. Each of the spray pipes is connected to a water system through a water supply joint on the spray bar base; and the spray bar is installed on the circular intake duct through a mounting seat. The three spray pipes are arranged along the intake direction, and are successively a front water spray section spray pipe, a middle water spray section spray pipe, and a rear water spray section spray pipe. The small-hole direct injection nozzles on the front water spray section spray pipe are front water spray section direct injection nozzles, the small-hole direct injection nozzles on the middle water spray section spray pipe are middle water spray section direct injection nozzles, and the small-hole direct injection nozzles on the rear water spray section spray pipe are rear water spray section direct injection nozzles.

Description

Technical Field

[0001] This application belongs to the technical field of jet pre-cooling for aero-engines, and particularly relates to a multi-channel jet pre-cooling atomizing spray bar adapted to a circular intake duct. Background Art

[0002] The principle of jet pre-cooling technology is to inject a low-boiling-point water medium or a mixture of water and methanol into a high-temperature and high-speed air flow through nozzles of different types. The discretized cooling medium is cut and broken by the high-speed air flow, the droplet size is further reduced, and it is fully mixed with the high-temperature air flow. By using its huge latent heat of vaporization, the temperature of the incoming flow is greatly reduced, the flight envelope of the engine is expanded, and it is not restricted by flight altitude and Mach number. The types of nozzles used for water medium atomization mainly include centrifugal nozzles, air atomizing nozzles, and small-hole direct injection nozzles, etc. The atomization characteristics of the nozzles are the main factors affecting the mixing effect and evaporation efficiency in the jet section. At the same time, the structural form of the nozzles also determines the design form of the spray bar. The role of the spray bar is to provide structural support for each nozzle and distribute the cooling medium to each nozzle. However, the spray bar will affect the movement of the fluid in the high-speed flow field, causing a retention effect and unevenness in the flow field at the rear end of the spray bar. Therefore, the spray bar needs to ensure sufficient strength while avoiding a large blockage ratio and weight.

[0003] In the prior art, the configuration design of the spray bar nozzles in existing jet pre-cooling devices is unreasonable. The spray bar nozzles generally adopt the design idea of a cylindrical spray bar plus a swirl nozzle, resulting in a large blockage ratio, causing a large intake pressure loss, and a large weight at the same time; the atomization effect of a single centrifugal nozzle is better than that of a small-hole direct injection nozzle. Generally, centrifugal atomizing nozzles are used in jet pre-cooling tests. However, the centrifugal atomizing nozzle is connected and sealed to the spray bar through a threaded structure, and there may be risks such as interface leakage and nozzle detachment; the imported centrifugal atomizing nozzles are expensive, and at the same time, the spray bar needs to be processed with high-precision threads matching the nozzles, and the atomizing spray bar has a complex process and high cost; the layout of the spray bar nozzles is unreasonable, resulting in uneven distribution of the jet cooling medium in the injection section, leading to uneven temperature field distribution after cooling; the two ends of the spray bar are fixed on both sides of the intake duct. During the operation of the spray bar, the thermal expansion and deformation are blocked, and the spray bar is easily damaged. In the non-working low-temperature state, the spray bar is prone to shrink and detach from the support of the intake duct.

[0004] Therefore, it is desirable to have a technical solution to overcome or at least mitigate at least one of the above-mentioned defects of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a multi-channel jet pre-cooling atomizing spray bar adapted to a circular intake duct to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is as follows:

[0007] A multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct, the spray rod comprising: a spray rod base and a spray pipe, wherein,

[0008] Three spray pipes are arranged in parallel on the spray rod base. A water supply channel is provided inside the spray pipe. A plurality of groups of small-hole direct spray nozzles communicating with the water supply channel are provided on the spray pipe. Each group includes two relatively arranged small-hole direct spray nozzles. Each spray pipe is connected to a water system through a water supply joint on the spray rod base; and

[0009] The spray rod is installed on the circular intake duct through a mounting seat. The three spray pipes are arranged along the intake direction of the circular intake duct, and are successively a front water spray section spray pipe, a middle water spray section spray pipe, and a rear water spray section spray pipe. The small-hole direct spray nozzles on the front water spray section spray pipe are front water spray section direct spray nozzles, the small-hole direct spray nozzles on the middle water spray section spray pipe are middle water spray section direct spray nozzles, and the small-hole direct spray nozzles on the rear water spray section spray pipe are rear water spray section direct spray nozzles. The spraying directions of the front water spray section direct spray nozzles, the middle water spray section direct spray nozzles, and the rear water spray section direct spray nozzles are all perpendicular to the intake direction.

[0010] In at least one embodiment of the present application, the spray rod is made of stainless steel.

[0011] In at least one embodiment of the present application, three water supply joints are installed on the spray rod base, and each spray pipe of the spray rod is connected to the water system through a corresponding water supply joint.

[0012] In at least one embodiment of the present application, a plurality of spray rods are installed in parallel on the circular intake duct, and the axial positions of the spray rods on the circular intake duct are the same. Among them,

[0013] The water spray section formed by the front water spray section direct spray nozzles of the plurality of spray rods is the front water spray section;

[0014] The water spray section formed by the middle water spray section direct spray nozzles of the plurality of spray rods is the middle water spray section;

[0015] The water spray section formed by the rear water spray section direct spray nozzles of the plurality of spray rods is the rear water spray section.

[0016] In at least one embodiment of the present application, 7 spray rods are installed in parallel at equal intervals on the circular intake duct.

[0017] In at least one embodiment of the present application, within the same water spray section, the small-hole direct spray nozzles of two adjacent spray pipes are arranged in a staggered manner.

[0018] In at least one embodiment of the present application, in adjacent water spray cross-sections, the small-hole direct injection nozzles of two adjacent spray pipes adopt an interlaced arrangement form.

[0019] In at least one embodiment of the present application,

[0020] The mounting seat includes a first mounting seat and a second mounting seat. The first mounting seat and the second mounting seat are respectively fixedly installed on the outer side wall surface of the circular air inlet passage. Mounting holes and bolt holes are provided on the mounting seat;

[0021] The second ends of the three spray pipes on the spray rod are inserted into the circular air inlet passage through the mounting holes of the first mounting seat and pass through the mounting holes of the second mounting seat. The first ends of the three spray pipes are bolted to the first mounting seat through the spray rod seat;

[0022] The second ends of the three spray pipes are connected by a baffle, and the baffle is prevented from falling off through a rabbet with the second mounting seat. A plug cover is installed on the second mounting seat through bolts.

[0023] In at least one embodiment of the present application, there is a predetermined gap between the second ends of the three spray pipes and the mounting holes of the second mounting seat.

[0024] In at least one embodiment of the present application, a thermal expansion space is reserved between the plug cover and the baffle.

[0025] The invention has at least the following beneficial technical effects:

[0026] The multi-flow path jet pre-cooling atomizing spray rod adapted to the circular air inlet passage of the present application,

[0027] a) Adopting the integrated design configuration of the spray rod and nozzle effectively reduces the blockage ratio of the spray rod, reduces the total pressure loss, minimizes the influence of the spray rod on the inlet air flow field to the greatest extent, and at the same time reduces the weight of the spray rod;

[0028] b) Adopting small-hole direct injection nozzles and the integrated design of the nozzle and spray rod, on the basis of reducing the blockage ratio and weight of the spray rod, risks such as interface leakage and nozzle detachment are avoided;

[0029] c) It is convenient to process, has a simple process, and low manufacturing cost;

[0030] d) Through the reasonable design of the spray rod and nozzle, the uniformity of the temperature field after jet pre-cooling is ensured;

[0031] e) Fully considering the influence of thermal expansion and contraction of the spray rod in the working scenario, it has the ability to absorb the thermal expansion amount when the spray rod is heated, and at the same time effectively prevents the spray rod from detaching from the support when contracting, improving the working reliability of the spray rod. Description of the Drawings

[0032] Figure 1 It is a sectional view of a multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct according to an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the arrangement of small-hole direct injection nozzles according to an embodiment of the present application;

[0034] Figure 3 It is a schematic diagram of the arrangement of a multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct according to an embodiment of the present application;

[0035] Figure 4 It is a schematic cross-sectional view of a nozzle according to an embodiment of the present application;

[0036] Figure 5 It is a schematic diagram of the distribution of direct injection nozzles in the front water spray cross-section according to an embodiment of the present application;

[0037] Figure 6 It is a schematic diagram of the distribution of direct injection nozzles in the middle water spray cross-section according to an embodiment of the present application;

[0038] Figure 7 It is a schematic diagram of the distribution of direct injection nozzles in the rear water spray cross-section according to an embodiment of the present application;

[0039] Figure 8 It is a combined projection schematic diagram of direct injection nozzles in the front water spray cross-section and direct injection nozzles in the middle water spray cross-section according to an embodiment of the present application;

[0040] Figure 9 It is a combined projection schematic diagram of direct injection nozzles in the front water spray cross-section, direct injection nozzles in the middle water spray cross-section, and direct injection nozzles in the rear water spray cross-section according to an embodiment of the present application;

[0041] Figure 10 It is a schematic diagram of the assembly of the first end of the spray rod according to an embodiment of the present application;

[0042] Figure 11 It is a schematic diagram of the assembly of the second end of the spray rod according to an embodiment of the present application.

[0043] Wherein:

[0044] 1 - small-hole direct injection nozzle; 2 - water supply channel; 3 - spray rod seat; 4 - spray pipe; 5 - direct injection nozzle in the front water spray cross-section; 6 - direct injection nozzle in the middle water spray cross-section; 7 - direct injection nozzle in the rear water spray cross-section; 8 - circular intake duct; 9 - spray rod; 10 - front water spray cross-section; 11 - middle water spray cross-section; 12 - rear water spray cross-section; 13 - mounting seat; 14 - bolt; 15 - plug; 16 - baffle. Detailed implementation manners

[0045] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings in the embodiments of this application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the drawings are exemplary and are intended to explain this application and should not be construed as limiting this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts fall within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the drawings.

[0046] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of this application.

[0047] The following will further elaborate on this application with reference to the attached Figures 1 to 11 This application will be further described in detail.

[0048] This application provides a multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct. The spray rod 9 includes: a spray rod base 3 and a spray pipe 4.

[0049] Specifically, each spray rod 9 is formed by welding three parallel spray pipes 4 to the spray rod base 3. The spray pipe 4 is a circular steel pipe. Each spray pipe 4 has a water supply channel 2 inside. Multiple groups of small-hole direct injection nozzles 1 communicating with the water supply channel 2 are provided on the spray pipe 4. The multiple groups of small-hole direct injection nozzles 1 are respectively arranged along the length direction of the corresponding spray pipe 4. Each group includes two small-hole direct injection nozzles 1 designed at opposite positions on both sides of the spray pipe 4. Each water supply channel 2 corresponds to multiple groups of small-hole direct injection nozzles 1 whose injection directions are perpendicular to the intake direction, as Figure 1 shown.

[0050] Among them, three water supply joints are installed on the spray bar base 3. The three spray pipes 4 on the spray bar 9 are all connected to the water system through the corresponding water supply joints on the spray bar base 3. The spray bar 9 is installed on the circular intake passage 8 through the mounting seat 13. The three spray pipes 4 are arranged along the intake direction, corresponding to the front spray section pipe, the middle spray section pipe, and the rear spray section pipe in sequence. The small hole direct injection nozzles 1 on the front spray section pipe are the front spray section direct injection nozzles 5, the small hole direct injection nozzles 1 on the middle spray section pipe are the middle spray section direct injection nozzles 6, and the small hole direct injection nozzles 1 on the rear spray section pipe are the rear spray section direct injection nozzles 7. And the injection directions of the front spray section direct injection nozzles 5, the middle spray section direct injection nozzles 6, and the rear spray section direct injection nozzles 7 are all perpendicular to the intake direction, as Figure 2 shown. In addition, the spray bar 9 is placed inside the intake air flow passage. To adapt to the high-temperature air flow environment, the entire spray bar 9 is made of stainless steel material.

[0051] For the multi-channel jet pre-cooling atomizing spray bar adapted to the circular intake passage of the present application, multiple spray bars 9 are installed in parallel on the circular intake passage 8, and the axial positions of the respective spray bars 9 on the circular intake passage 8 are the same. In the preferred embodiment of the present application, based on the atomization area covered by the small hole direct injection nozzles 1 on each spray bar 9, the layout design of the spray bar 9 is carried out based on the circular intake passage 8. Seven spray bars 9 are arranged in parallel at equal intervals on the circular intake passage 8, and the seven spray bars 9 are arranged at the same axial position on the circular intake passage 8. The arrangement of the spray bars 9 is as Figure 3 shown.

[0052] For the multi-channel jet pre-cooling atomizing spray bar adapted to the circular intake passage of the present application, in order to reduce the blocking area of the spray bar 9 at the water spray section and reduce the influence of the spray bar 9 on the intake air flow field, the three water supply channels 2 corresponding to the three water spray sections on the spray bar 9 adopt a front-back superimposed structural form. In this embodiment, the water supply channels 2 at the same axial position of the seven spray bars 9 form a water spray section. The water spray section formed by the front spray section direct injection nozzles 5 of the 7 spray bars 9 is the front water spray section 10, the water spray section formed by the middle spray section direct injection nozzles 6 is the middle water spray section 11, and the water spray section formed by the rear spray section direct injection nozzles 7 is the rear water spray section 12. The position of the injection section is as Figure 4 shown.

[0053] The multi-channel jet pre-cooling atomizing spray rod adapted to the circular intake duct of the present application. To ensure uniform water spray distribution along the length direction of a single spray rod 9, the small-hole direct injection nozzles 1 on the three water supply channels 2 are arranged in a staggered manner. According to the minimum water spray requirement of jet pre-cooling, to ensure the atomization effect of the water medium and increase the initial injection pressure of the small-hole direct injection nozzles 1, the water volume of this part should be provided by the injection section with the least number of nozzles. Therefore, it is set that the water volume of this part is completely provided by the front water spray section. At the same time, according to the minimum water spray volume of jet pre-cooling and the flow rate of a single nozzle under the minimum working pressure, the number of direct injection nozzles 5 in the front water spray section can be calculated. For the selection of the number of direct injection nozzles 6 in the middle water spray section and direct injection nozzles 7 in the rear water spray section, on the one hand, consider reducing the influence of the water spray volume at the initial opening of the middle water spray section or the rear water spray section on the total water spray volume, and on the other hand, consider factors such as the uniformity of the distribution of water media with different flow rates in the flow channel. Considering the above factors comprehensively and combining with the layout of the small-hole direct injection nozzles 1 in the three water spray sections, determine the number of small-hole direct injection nozzles in the front water spray section, the middle water spray section, and the rear water spray section. Within the same water spray section, the small-hole direct injection nozzles 1 on a single spray rod 9 are basically arranged at equal intervals, and the distribution of the small-hole direct injection nozzles 1 on two adjacent spray rods 9 is in a staggered form. At the same time, considering the water spray uniformity when the three water spray sections are working, the nozzles in adjacent water spray sections are arranged in a staggered layout, and the distribution and combined projection of the small-hole direct injection nozzles 1 in each water spray section are as shown in Figures 5 to 9 shown.

[0054] In the preferred embodiment of the present application, the assembly structure of the spray rod 9 is as shown in Figures 10 to 11As shown in the figure. The mounting base 13 includes a first mounting base and a second mounting base. The first mounting base and the second mounting base are respectively fixedly mounted on the outer wall surface of the circular intake duct 8 by welding. Mounting holes and bolt holes are provided on both mounting bases 13. There is no step difference between the mounting base 13 and the circular intake duct 8. The second ends of the three spray nozzles 4 on the spray bar 9 are inserted into the circular intake duct 8 through the mounting holes of the first mounting base and pass through the mounting holes of the second mounting base. The first ends of the three spray nozzles 4 are fixedly mounted on the spray bar seat 3. The mounting base 13 is fixedly connected to the first mounting base by a mating bolt 14. After the first end of the spray bar 9 is fixed, a baffle 16 is installed at the second ends of the three spray nozzles 4. Finally, a plug 15 is installed on the second mounting base by a bolt 14. Among them, the baffle 16 is prevented from coming off from the second mounting base by a rabbet. Advantageously, in this embodiment, a certain gap is ensured between the second ends of the three spray nozzles 4 and the mounting holes of the second mounting base, and a thermal expansion space is reserved between the plug 15 and the baffle 16 according to the highest working temperature of the spray bar and the length of the spray bar 9. When the spray bar 9 is in the working state, the spray bar 9 is in a high-temperature and high-speed air flow. The spray bar 9 expands thermally along the installation direction. At the same time, the high-speed air flow exerts a large axial force on the spray bar 9, and the spray bar 9 is bent and deformed. At this time, the second end of the spray nozzle 4 contacts the wall surface of the mounting hole of the second mounting base, and the spray bar 9 forms a two-point support force. When the spray bar 9 is in the non-working state and cools down and contracts, the rabbet structure between the baffle 16 and the second mounting base can prevent the spray bar 9 from disengaging from the support.

[0055] The multi-flow-path jet pre-cooling atomizing spray bar adapted to the circular intake duct of the present application adopts a design configuration of integrating the spray bar and the nozzle. Along the flow direction of the high-temperature fluid, three water supply channels are arranged overlappingly, effectively reducing the blockage ratio of the spray bar, reducing the total pressure loss, and significantly reducing the weight of the spray bar; the small-hole direct injection nozzle adopted has a simple structure and a small volume, avoiding risks such as interface leakage and nozzle detachment caused by the existence of an installation interface on the nozzle; the water supply channel directly selects a standard stainless steel pipe, and small-hole direct injection nozzles are directly processed on both sides of the steel pipe. The spray bar has a low cost, easy procurement of raw materials, and simple process; through the reasonable design of the spray bar nozzle, the uniformity of the temperature field after jetting is effectively improved; a structure of single-side fixing and single-side simply supported is adopted to ensure that the spray bar expands thermally flexibly in the high-temperature fluid, and at the same time, a baffle structure is designed to prevent the spray bar from disengaging from the support in the cold-shrinking state.

[0056] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake passage, characterized in that, The spray boom (9) includes: a spray boom base (3) and a spray pipe (4), wherein, Three spray pipes (4) are arranged in parallel on the spray boom base (3). A water supply channel (2) is provided inside the spray pipe (4). A plurality of groups of small-hole direct spray nozzles (1) communicating with the water supply channel (2) are formed on the spray pipe (4). Each group includes two relatively arranged small-hole direct spray nozzles (1); and The spray boom (9) is installed on the circular intake passage (8) through a mounting seat (13). The three spray pipes (4) are arranged along the intake direction of the circular intake passage (8), which are the front spray cross-section spray pipe, the middle spray cross-section spray pipe, and the rear spray cross-section spray pipe in sequence. The small-hole direct spray nozzles (1) on the front spray cross-section spray pipe are the front spray cross-section direct spray nozzles (5). The small-hole direct spray nozzles (1) on the middle spray cross-section spray pipe are the middle spray cross-section direct spray nozzles (6). The small-hole direct spray nozzles (1) on the rear spray cross-section spray pipe are the rear spray cross-section direct spray nozzles (7). The spraying directions of the front spray cross-section direct spray nozzles (5), the middle spray cross-section direct spray nozzles (6), and the rear spray cross-section direct spray nozzles (7) are all perpendicular to the intake direction.

2. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular air inlet according to claim 1, characterized in that, The spray boom (9) is made of stainless steel.

3. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake passage according to claim 1, characterized in that, Three water supply connectors are installed on the spray boom base (3). Each spray pipe (4) of the spray boom (9) is connected to the water system through a corresponding water supply connector.

4. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular air inlet according to claim 1, wherein, A plurality of spray booms (9) are installed in parallel on the circular intake passage (8), and the axial positions of the respective spray booms (9) on the circular intake passage (8) are the same. Among them, The water spray cross-section formed by the front spray cross-section direct spray nozzles (5) of the plurality of spray booms (9) is the front water spray cross-section (10); The water spray cross-section formed by the middle spray cross-section direct spray nozzles (6) of the plurality of spray booms (9) is the middle water spray cross-section (11); The water spray cross-section formed by the rear spray cross-section direct spray nozzles (7) of the plurality of spray booms (9) is the rear water spray cross-section (12).

5. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake passage according to claim 4, wherein Seven spray booms (9) are installed in parallel at equal intervals on the circular intake passage (8).

6. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular air inlet according to claim 5, wherein Within the same water spray cross-section, the small-hole direct spray nozzles (1) of two adjacent spray pipes (4) are arranged in a staggered manner.

7. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular air inlet according to claim 6, wherein Among adjacent water spray cross-sections, the small-hole direct spray nozzles (1) of two adjacent spray pipes (4) are arranged in a staggered manner.

8. The multi-flow-path jet pre-cooling atomizing spray boom adapted to a circular intake passage according to claim 1, characterized in that The mounting seat (13) includes a first mounting seat and a second mounting seat. The first mounting seat and the second mounting seat are respectively fixedly installed on the outer wall surface of the circular intake passage (8). The mounting seat (13) is provided with a mounting hole and a bolt hole; The second ends of the three spray pipes (4) on the spray boom (9) are inserted into the circular intake passage (8) through the mounting holes of the first mounting seat and pass out through the mounting holes of the second mounting seat. The first ends of the three spray pipes (4) are bolted to the first mounting seat through the spray boom base (3); The second ends of the three nozzles (4) are connected by a baffle plate (16), and the baffle plate (16) is prevented from coming off from the second mounting seat through a rabbet, and a plug cover (15) is mounted on the second mounting seat by bolts.

9. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct according to claim 8, wherein, There is a predetermined gap between the second ends of the three nozzles (4) and the mounting holes of the second mounting seat.

10. The multi-channel jet pre-cooling atomizing spray rod adapted to a circular intake duct according to claim 9, characterized in that, A thermal expansion space is reserved between the plug cover (15) and the baffle plate (16).

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