A method for designing a pre-cooled airfoil nozzle.

Abstract

This application belongs to the field of jet precooling technology for aero-engines, and specifically relates to a design method for a jet precooling airfoil nozzle. The jet precooling airfoil nozzle of this application adopts an airfoil nozzle configuration design, effectively reducing the nozzle's blockage ratio, minimizing total pressure loss, and minimizing the nozzle's impact on the inlet airflow field. Simultaneously, it reduces the nozzle's weight, providing a reference for the design of miniaturized and lightweight jet precooling devices for integrated aircraft. It employs small-orifice direct-injection nozzle technology and an integrated nozzle-nozzle design, reducing the nozzle's blockage ratio and weight while avoiding risks caused by nozzle leakage and detachment. Through rational nozzle-nozzle design, the uniformity of the temperature field after jet precooling is ensured.

Description

Technical Field

[0001] This application belongs to the field of jet precooling technology for aero-engines, and specifically relates to a jet precooling airfoil nozzle design method. Background Technology

[0002] The principle of jet precooling technology is to inject low-boiling-point water or a mixture of water and methanol into a high-temperature, high-speed airflow through various types of nozzles. The discrete cooling medium is cut and broken by the high-speed airflow, further reducing the droplet size and allowing it to mix thoroughly with the high-temperature airflow. Utilizing its enormous latent heat of vaporization, the jet significantly reduces the incoming flow temperature, extending the engine's flight envelope and freeing it from the limitations of flight altitude and Mach number. The spray boom provides structural support for each nozzle and distributes the cooling medium to them. Therefore, in high-speed flow conditions, the spray boom needs to ensure sufficient strength while avoiding a large blockage ratio and weight. Nozzle types used for water atomization mainly include centrifugal nozzles, air atomizing nozzles, and small-orifice direct-injection nozzles. The configuration and layout of the spray boom nozzles directly affect the inlet total pressure recovery coefficient, jet precooling efficiency, and the uniformity of the temperature field distribution after precooling. Simultaneously, the nozzle structure also determines the design of the spray boom.

[0003] In existing technologies, the design of the spray bar nozzle configuration is unreasonable. Existing jet precooling devices generally adopt a cylindrical spray bar plus swirling nozzle design, which leads to a large blockage ratio, causing significant intake pressure loss, and also results in a large weight. A single centrifugal nozzle has a better atomization effect than a small-orifice direct-injection nozzle. Generally, centrifugal atomizing nozzles are used in jet precooling tests. However, the centrifugal atomizing nozzle is connected and sealed to the spray bar through a threaded structure, which may pose risks such as interface leakage and nozzle detachment. The unreasonable arrangement of the spray bar nozzles leads to uneven distribution of the jet cooling medium in the spray cross section, resulting in uneven temperature field distribution after cooling.

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

[0005] The purpose of this application is to provide a jet precooled airfoil nozzle design method to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A method for designing a jet precooled airfoil nozzle includes:

[0008] Step 1: Determine the basic structure of the spray boom, whereby...

[0009] The spray bar has a subsonic airfoil cross-section, and multiple parallel water supply channels are formed inside the spray bar. The spray bar also has multiple sets of small-orifice direct-fire nozzles communicating with the corresponding water supply channels, each set including two oppositely arranged small-orifice direct-fire nozzles; and

[0010] The spray bar is installed on the air intake duct, and the multiple water supply channels are arranged along the air intake direction of the air intake duct. The spray direction of the small-hole direct-fire nozzle is perpendicular to the air intake direction.

[0011] Step 2: Determine the maximum penetration depth of a single nozzle on the spray bar. Based on the maximum penetration depth and the size of the air intake, arrange multiple spray bars on the air intake according to the principle of uniform distribution to obtain a variety of different spray bar arrangement schemes.

[0012] Step 3: Establish a three-dimensional calculation model for each spray boom arrangement scheme, conduct simulation analysis, and determine the optimal spray boom arrangement scheme;

[0013] Step 4: Determine the total number of nozzles on all spray bars in the optimal spray bar arrangement scheme based on the maximum spray flow rate of the jet pre-cooling test, and determine the number of spray cross sections based on the arrangement space of a single spray bar and the installation space of adjacent nozzles.

[0014] Step 5: Determine the number of nozzles on the first spray section based on the minimum spray flow rate of the jet precooling test, and determine the number of nozzles on other spray sections based on the number of nozzles on the first spray section and the total number of nozzles.

[0015] Step 6: Determine the arrangement of nozzles on each spray section. Within the same spray section, nozzles on two adjacent spray bars are arranged in an alternating pattern; on the same spray bar, nozzles in adjacent spray sections are arranged in an alternating pattern.

[0016] In at least one embodiment of this application, in step two, the inlet cross-section of the air intake is rectangular;

[0017] The spray boom arrangement scheme includes:

[0018] The first spray bar arrangement scheme is as follows: based on the maximum penetration depth and the size of the air intake, seven spray bars are evenly arranged along the longitudinal direction of the air intake.

[0019] The second spray bar arrangement scheme is as follows: based on the maximum penetration depth and the size of the air intake, two spray bars are evenly arranged in the transverse direction of the air intake.

[0020] In at least one embodiment of this application, in step three, the optimal spray bar arrangement scheme is determined based on the intake pressure loss and the uniformity of the temperature field distribution after pre-cooling.

[0021] In at least one embodiment of this application, step four, which involves determining the total number of nozzles on all spray bars in the optimal spray bar arrangement based on the maximum water flow rate from the jet pre-cooling test, includes:

[0022]

[0023] Where n1 is the total number of nozzles, V b denoted as the maximum water flow rate, μ as the flow coefficient, S as the area of ​​a single nozzle orifice, ρ as the fluid density, and ΔP as the pressure difference across the nozzle orifice.

[0024] In at least one embodiment of this application, step five, which involves determining the number of nozzles on the first-opening spray section based on the minimum spray flow rate of the jet pre-cooling test, includes:

[0025]

[0026] Where n2 is the number of nozzles on the first water spray section to be activated, and V s denoted as minimum water flow rate, μ as flow coefficient, S as area of ​​a single nozzle orifice, ρ as fluid density, and ΔP as pressure difference across the nozzle orifice.

[0027] In at least one embodiment of this application, the spray bar has three parallel water supply channels inside. The spray bar is installed on the air intake duct. The three water supply channels are arranged along the air intake direction of the air intake duct, and are sequentially a front water supply channel, a middle water supply channel, and a rear water supply channel. The small-hole direct-shot nozzle corresponding to the front water supply channel is a front spray section direct-shot nozzle. The small-hole direct-shot nozzle corresponding to the middle water supply channel is a middle spray section direct-shot nozzle. The small-hole direct-shot nozzle corresponding to the rear water supply channel is a rear spray section direct-shot nozzle. The spray direction of the front spray section direct-shot nozzle, the middle spray section direct-shot nozzle, and the rear spray section direct-shot nozzle is perpendicular to the air intake direction.

[0028] In at least one embodiment of this application,

[0029] The water spray section formed by the direct-shot nozzles of the seven spray bars is the front water spray section;

[0030] The water spray section formed by the direct-shoot nozzles in the middle water spray section of the 7 spray bars is the middle water spray section;

[0031] The water spray section formed by the direct-shot nozzles of the seven spray bars is the rear water spray section;

[0032] The first nozzle to open is the front spray section direct nozzle.

[0033] In at least one embodiment of this application, the spray bar is mounted on the air intake via a mounting bracket.

[0034] In at least one embodiment of this application, the three water supply channels of the spray bar are all connected to the water system through corresponding water supply connectors.

[0035] The invention has at least the following beneficial technical effects:

[0036] The jet precooled airfoil nozzle of this application,

[0037] a) The airfoil-shaped nozzle configuration design effectively reduces the nozzle blockage ratio, reduces the total pressure loss, minimizes the influence of the nozzle on the inlet airflow field, and reduces the nozzle weight. This can provide a reference for the design of miniaturized and lightweight jet precooling devices for whole-machine integration.

[0038] b) Employing small-orifice direct-fire nozzle technology and an integrated nozzle-spray bar design, this reduces the spray bar clogging ratio and weight, while avoiding various risks caused by nozzle leakage and detachment.

[0039] c) By rationally designing the spray bar nozzle, the uniformity of the temperature field after the jet precooling is ensured. Attached Figure Description

[0040] Figure 1 This is a flowchart of a jet precooled airfoil nozzle design method according to one embodiment of this application;

[0041] Figure 2 This is a schematic diagram of two spray bar arrangement schemes according to one embodiment of this application;

[0042] Figure 3 This is a total temperature cloud map of two spray bar arrangement schemes according to one embodiment of this application;

[0043] Figure 4 This is a cross-sectional view of a jet precooled airfoil nozzle according to one embodiment of this application;

[0044] Figure 5 This is a schematic diagram of the arrangement of a small-hole direct-fire nozzle according to one embodiment of this application;

[0045] Figure 6 This is a schematic diagram of three water spray cross sections according to one embodiment of this application;

[0046] Figure 7 This is a schematic diagram of the direct-fire nozzle distribution at the front spray section according to one embodiment of this application;

[0047] Figure 8 This is a schematic diagram of the distribution of direct-fire nozzles in the intermediate water spray section according to one embodiment of this application;

[0048] Figure 9 This is a schematic diagram of the direct-fire nozzle distribution in the rear water spray section according to one embodiment of this application;

[0049] Figure 10 This is a combined projection schematic diagram of the front spray section direct nozzle and the middle spray section direct nozzle according to one embodiment of this application;

[0050] Figure 11 This is a combined projection diagram of the front spray section direct nozzle, the middle spray section direct nozzle, and the rear spray section direct nozzle according to one embodiment of this application.

[0051] in:

[0052] 1-Small-hole direct-fire nozzle; 2-Water supply channel; 3-Spray bar; 4-Front spray section direct-fire nozzle; 5-Middle spray section direct-fire nozzle; 6-Rear spray section direct-fire nozzle. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages 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 drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0054] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0055] The following is in conjunction with the appendix Figures 1 to 11 This application will be described in further detail.

[0056] This application provides a method for designing a jet pre-cooled airfoil nozzle, including the following steps:

[0057] Step 1: Determine the basic structure of spray bar 3, where,

[0058] The spray boom 3 has a subsonic airfoil cross-section. Multiple parallel water supply channels 2 are provided inside the spray boom 3, and multiple sets of small-hole direct-fire nozzles 1 connected to the corresponding water supply channels 2 are also provided on the spray boom 3. Each set includes two oppositely arranged small-hole direct-fire nozzles 1.

[0059] The spray bar 3 is installed on the air intake duct, and multiple water supply channels 2 are arranged along the air intake direction of the air intake duct. The spray direction of the small hole direct spray nozzle 1 is perpendicular to the air intake direction.

[0060] After determining the basic structure of the spray boom 3, the further design of the spray boom 3 is carried out according to the following steps:

[0061] Step 2: Determine the maximum penetration depth of a single nozzle on the spray bar 3. Based on the maximum penetration depth and the size of the air intake, arrange multiple spray bars 3 on the air intake according to the principle of uniform arrangement to obtain a variety of different spray bar arrangement schemes.

[0062] Step 3: Establish a three-dimensional calculation model for each spray boom arrangement scheme, conduct simulation analysis, and determine the optimal spray boom arrangement scheme;

[0063] Step 4: Determine the total number of nozzles on all spray bars 3 in the optimal spray bar arrangement scheme based on the maximum spray flow rate of the jet pre-cooling test, and determine the number of spray cross sections based on the arrangement space of a single spray bar 3 and the installation space of adjacent nozzles.

[0064] Step 5: Determine the number of nozzles on the first spray section based on the minimum spray flow rate of the jet precooling test, and determine the number of nozzles on other spray sections based on the number of nozzles on the first spray section and the total number of nozzles.

[0065] Step 6: Determine the arrangement of nozzles on each spray section. Within the same spray section, the nozzles on two adjacent spray bars 3 are arranged in an alternating pattern; on the same spray bar 3, the nozzles in adjacent spray sections are arranged in an alternating pattern.

[0066] In order to reduce the influence of the spray bar 3 on the inlet airflow field, the spray bar 3 of this application adopts a subsonic airfoil cross-section design. Each spray bar 3 integrates multiple parallel water supply channels 2. Each water supply channel 2 corresponds to multiple sets of small-hole direct-injection nozzles 1. The spray direction of the small-hole direct-injection nozzles 1 is perpendicular to the air inlet direction. The orifice design principle is to ensure good atomization effect of water medium while avoiding impurities in water medium from clogging the nozzles.

[0067] The jet precooled airfoil spray bar design method of this application, after determining the basic structure of the spray bar 3, combines factors such as the test air intake state, water pressure, and nozzle orifice diameter, and uses numerical simulation method to calculate the maximum penetration depth of a single nozzle on the spray bar 3. Based on the maximum penetration depth and the air intake duct size, the spray bar 3 is arranged according to the principle of uniform arrangement. The arrangement scheme can have different forms depending on the cross-sectional shape and size of the air intake duct. In this embodiment, the inlet cross-section of the air intake is approximately rectangular. Two spray bar arrangement schemes are initially proposed. Both schemes ensure that the area covered by a single spray bar 3 is the same. The first arrangement involves uniformly arranging seven spray bars 3 longitudinally along the air intake based on the maximum penetration depth and air intake dimensions. The blockage ratio of the spray bar 3 arrangement cross-section is only 7%. The second arrangement involves uniformly arranging two spray bars 3 laterally along the air intake based on the maximum penetration depth and air intake dimensions. Due to the relatively long length of the spray bars 3, two longitudinal supports are installed in the middle of each spray bar 3 to prevent deformation or vibration. The blockage ratio of the spray bar 3 arrangement cross-section is 9.1%. Figure 2 As shown.

[0068] The jet precooling airfoil nozzle design method of this application establishes three-dimensional calculation models of different nozzle arrangement schemes, uses commercial analysis software to simulate and analyze parameters such as total inlet pressure loss and uniformity of temperature field distribution after precooling, and compares the advantages and disadvantages of different layout schemes based on usage experience to select the optimal nozzle arrangement scheme. In this embodiment, it can be seen from the nozzle layout of the first and second nozzle arrangement schemes that the area covered by a single nozzle 3 is the same in both schemes. Evaporative cooling simulation calculations were performed for the two schemes under certain inlet conditions and water spray volume, and the calculation results are as follows: Figure 3 As shown in the figure. Based on the simulation results of evaporation cooling for the two schemes, the temperature field uniformity at the air inlet outlet of the first spray bar arrangement scheme is significantly better than that of the second spray bar arrangement scheme. Therefore, the first spray bar arrangement scheme is selected for the next design work.

[0069] The jet precooling airfoil spray boom design method of this application, after determining the spray boom arrangement scheme, further determines the number and arrangement of nozzles on each spray boom 3. Specifically, the total number of nozzles on all spray booms 3 in the optimal spray boom arrangement scheme is determined based on the maximum water flow rate of the jet precooling test. The formula for calculating the total number of nozzles is as follows:

[0070]

[0071] Where n1 is the total number of nozzles, V b The maximum water flow rate is given by μ, where μ is the flow coefficient and S is the area of ​​a single nozzle orifice (m²). 2 ), where ρ is the fluid density (kg / m³). 3 ), where ΔP is the pressure difference (Pa) across the nozzle orifice.

[0072] After determining the total number of nozzles on the 7 spray bars 3 in the optimal spray bar arrangement scheme, the number of water spray sections is determined based on the installation space of the spray bars 3 and the nozzles.

[0073] Then, based on the minimum water flow rate of the jet precooling test, determine the number of nozzles on the first spray section to be opened. The formula for calculating the number of nozzles is:

[0074]

[0075] Where n2 is the number of nozzles on the first water spray section to be activated, and V s The minimum spray flow rate is given by μ, where μ is the flow coefficient and S is the area of ​​a single nozzle orifice (m²). 2 ), where ρ is the fluid density (kg / m³). 3 ), where ΔP is the pressure difference (Pa) across the nozzle orifice.

[0076] After determining the number of nozzles on the first spray section to be activated, the number of nozzles on other spray sections that are activated later is further determined. When determining the number of nozzles on the spray sections that are activated later, two main factors are considered: firstly, to reduce the impact of the initial spray volume on the pulsation of the total spray volume; and secondly, to consider the uniformity of the distribution of water media with different flow rates within the flow channel.

[0077] In a preferred embodiment of this application, the spray bar 3 has three parallel water supply channels 2 inside. The spray bar 3 is mounted on the air intake via mounting bases, and each of the three water supply channels 2 is connected to the water system via a corresponding water supply connector. In this embodiment, each spray bar 3 is mounted on the air intake via two mounting bases. The first end of the spray bar 3 is provided with a spray bar seat, and the second end of the spray bar 3 is inserted into the air intake through the mounting hole of one mounting base and protrudes through the mounting hole of the other mounting base. The first end of the spray bar 3 is bolted to the spray bar seat, and the second end of the spray bar 3 is equipped with a baffle. The baffle is prevented from detaching from the mounting base by a stop, and the second end of the spray bar 3 is sealed by installing a plug on the mounting base. Three water supply channels 2 are arranged along the air intake direction of the air intake duct, namely, the front water supply channel, the middle water supply channel, and the rear water supply channel. The small-hole direct-injection nozzle 1 corresponding to the front water supply channel is the front spray section direct-injection nozzle 4; the small-hole direct-injection nozzle 1 corresponding to the middle water supply channel is the middle spray section direct-injection nozzle 5; and the small-hole direct-injection nozzle 1 corresponding to the rear water supply channel is the rear spray section direct-injection nozzle 6. The spray direction of the front spray section direct-injection nozzle 4, the middle spray section direct-injection nozzle 5, and the rear spray section direct-injection nozzle 6 is perpendicular to the air intake direction. Figure 4-5As shown in the diagram. In this embodiment, the spray bar 3 adopts a subsonic airfoil cross-section design, with its leading edge located upstream of the airflow and its trailing edge located downstream of the airflow. Seven spray bars are evenly arranged longitudinally along the air intake. The water spray section formed by the direct-injection nozzles 4 of the front spray section of the seven spray bars 3 is the front water spray section; the water spray section formed by the direct-injection nozzles 5 of the middle spray section of the seven spray bars 3 is the middle water spray section; and the water spray section formed by the direct-injection nozzles 6 of the rear spray section of the seven spray bars 3 is the rear water spray section. Depending on the jet flow rate, the three spray sections spray water sequentially. At low flow rates, the front spray section sprays water; at medium flow rates, the front and middle spray sections spray water simultaneously; and at high flow rates, the front, middle, and rear spray sections spray water simultaneously. The spray section positions are as shown in the diagram. Figure 6 As shown. Considering the uniformity of the jet flow from a single spray section and the uniformity of the jet flow from superimposed spray sections, within the same spray section, the small-hole direct-fire nozzles 1 on a single spray bar 3 are basically arranged at equal intervals; on the same spray section, the distribution of the small-hole direct-fire nozzles 1 on two adjacent spray bars 3 is staggered; considering the uniformity of the spray flow when the three spray sections are working, the nozzles in adjacent spray sections on the same spray bar are staggered; the nozzle spacing needs to fully consider the influence of factors such as nozzle orifice diameter, nozzle atomization cone angle, and jet penetration depth. In this embodiment, the front spray section direct nozzles 4 of the seven spray bars include 11 groups, 10 groups, 11 groups, 10 groups, 11 groups, 10 groups, 11 groups, and 11 groups respectively; the middle spray section direct nozzles 5 include 12 groups, 11 groups, 12 groups, 11 groups, 12 groups, 11 groups, and 12 groups respectively; and the rear spray section direct nozzles 6 include 12 groups, 12 groups, 12 groups, 12 groups, 12 groups, and 12 groups respectively. The distribution and combined projection of the small-hole direct nozzles 1 of each spray section are shown in the figure. Figures 7-11 As shown.

[0078] This application's jet precooling airfoil nozzle design method, while ensuring the nozzle structural strength meets usage requirements, compares the advantages and disadvantages of different nozzle arrangement schemes from an aerodynamic performance perspective. The nozzle layout design process is applicable to, but not limited to, integrated configuration designs of airfoil nozzles and small-orifice direct-injection nozzles. The airfoil nozzle configuration design effectively reduces the nozzle's blockage ratio, decreases total pressure loss, minimizes the nozzle's impact on the inlet airflow field, and reduces nozzle weight. This provides a reference for the design of miniaturized and lightweight jet precooling devices for overall integration. The use of small-orifice direct-injection nozzle technology and integrated nozzle-nozzle design reduces the nozzle's blockage ratio and weight while avoiding risks caused by nozzle leakage and detachment. Through rational nozzle-nozzle design, the uniformity of the temperature field after jet precooling is ensured.

[0079] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for designing a jet pre-cooled airfoil nozzle, characterized in that, include: Step 1: Determine the basic structure of the spray bar (3), whereby... The spray bar (3) has a subsonic airfoil cross-section. Multiple parallel water supply channels (2) are provided inside the spray bar (3), and multiple sets of small-hole direct-fire nozzles (1) connected to the corresponding water supply channels (2) are also provided on the spray bar (3). Each set includes two oppositely arranged small-hole direct-fire nozzles (1). The spray bar (3) is installed on the air intake channel, and multiple water supply channels (2) are arranged along the air intake direction of the air intake channel. The spray direction of the small hole direct nozzle (1) is perpendicular to the air intake direction. Step 2: Determine the maximum penetration depth of a single nozzle on the spray bar (3). Based on the maximum penetration depth and the size of the air intake, arrange multiple spray bars (3) on the air intake according to the principle of uniform arrangement to obtain a variety of different spray bar arrangement schemes. Step 3: Establish a three-dimensional calculation model for each spray boom arrangement scheme, conduct simulation analysis, and determine the optimal spray boom arrangement scheme; Step 4: Determine the total number of nozzles on all spray bars (3) in the optimal spray bar arrangement scheme based on the maximum spray flow rate of the jet pre-cooling test, and determine the number of spray cross sections based on the arrangement space of a single spray bar (3) and the installation space of adjacent nozzles. In step four, determining the total number of nozzles on all spray bars (3) in the optimal spray bar arrangement scheme based on the maximum water flow rate of the jet pre-cooling test includes: ； in, This represents the total number of nozzles. For maximum water flow rate, For flow coefficient, The area of ​​a single nozzle orifice. For fluid density, The pressure difference across the nozzle orifice; Step 5: Determine the number of nozzles on the first spray section based on the minimum spray flow rate of the jet precooling test, and determine the number of nozzles on other spray sections based on the number of nozzles on the first spray section and the total number of nozzles. Step five, determining the number of nozzles on the first spray section to be activated based on the minimum spray flow rate of the jet pre-cooling test, includes: ； in, This refers to the number of nozzles on the first water spray section to be activated. Minimum water flow rate, For flow coefficient, The area of ​​a single nozzle orifice. For fluid density, The pressure difference across the nozzle orifice; Step 6: Determine the arrangement of nozzles on each spray section. In the same spray section, the nozzles on two adjacent spray bars (3) are arranged in an alternating manner; on the same spray bar (3), the nozzles in adjacent spray sections are arranged in an alternating manner.

2. The jet pre-cooled airfoil nozzle design method according to claim 1, characterized in that, In step two, the inlet cross-section of the air intake is rectangular; The spray boom arrangement scheme includes: The first spray bar arrangement scheme is as follows: based on the maximum penetration depth and the size of the air intake, seven spray bars are evenly arranged along the longitudinal direction of the air intake (3). The second spray bar arrangement scheme is as follows: based on the maximum penetration depth and the size of the air intake, two spray bars are evenly arranged in the transverse direction of the air intake (3).

3. The jet pre-cooled airfoil nozzle design method according to claim 2, characterized in that, In step three, the optimal nozzle arrangement scheme is determined based on the intake pressure loss and the uniformity of the temperature field distribution after pre-cooling.

4. The jet pre-cooled airfoil nozzle design method according to claim 3, characterized in that, The spray bar (3) has three parallel water supply channels (2) inside. The spray bar (3) is installed on the air intake channel. The three water supply channels (2) are arranged along the air intake direction of the air intake channel, namely the front water supply channel, the middle water supply channel and the rear water supply channel. The small hole direct spray nozzle (1) corresponding to the front water supply channel is the front spray section direct spray nozzle (4). The small hole direct spray nozzle (1) corresponding to the middle water supply channel is the middle spray section direct spray nozzle (5). The small hole direct spray nozzle (1) corresponding to the rear water supply channel is the rear spray section direct spray nozzle (6). The spray direction of the front spray section direct spray nozzle (4), the middle spray section direct spray nozzle (5) and the rear spray section direct spray nozzle (6) is perpendicular to the air intake direction.

5. The jet pre-cooled airfoil nozzle design method according to claim 4, characterized in that, The water spray section formed by the front water spray section of the 7 spray bars (3) and the direct nozzle (4) is the front water spray section; The water spray section formed by the direct-to-nozzle (5) of the middle water spray section of the 7 spray bars (3) is the middle water spray section; The water spray section formed by the rear water spray section of the 7 spray bars (3) and the direct nozzle (6) is the rear water spray section; Among them, the first nozzle to open is the front water spray section direct nozzle (4).

6. The jet pre-cooled airfoil nozzle design method according to claim 5, characterized in that, The spray bar (3) is mounted on the air intake via a mounting bracket.

7. The jet pre-cooled airfoil nozzle design method according to claim 6, characterized in that, The three water supply channels (2) of the spray bar (3) are all connected to the water system through corresponding water supply connectors.

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