Jet flow cooling device

Abstract

The invention belongs to an aero-engine cooling system, and particularly relates to a jet cooling device, which adopts different flow gradient designs in nozzle design, and ensures that in a low state, the incoming flow temperature is higher than the allowable range of an engine but slightly overtemperature, partial jet points are jetted in a small state, the atomization effect of each jet point is ensured, and the cooling effect of the jet cooling device is improved. Therefore, the evaporation efficiency is improved, the jet flow effect in a small state can be guaranteed, when the inlet state is high, the temperature of the air inlet channel is high, all the nozzles are opened at the moment, atomization of all spraying points can be guaranteed, and effective evaporation, heat absorption and cooling are guaranteed. By means of the design, it can be guaranteed that jet liquid is well atomized in the whole working range, meanwhile, under the condition of airflow distortion, effective cooling and temperature distribution adjustment can be effectively carried out on an effective structure through the partition and gradient flow design, and good temperature field distribution of the section of an outlet of the jet section of the air inlet channel can be effectively guaranteed.

Description

Technical Field

[0001] The present application relates to an aircraft engine cooling system, and in particular to a jet cooling device. Background Art

[0002] When the aircraft engine is in high Mach number flight state, the intake temperature of the aircraft engine is getting higher and higher, and the uneven distribution of the intake air flow field is also increasing. The inlet temperature needs to be cooled before the engine inlet, and the uniformity of the temperature field distribution is guaranteed. The temperature field of the air is adjusted to a uniform state within a short time and short distance. At present, direct injection points are generally used, or uniform layout measures are adopted to achieve the injection of liquid, which can achieve local cooling. When the engine inlet airflow is a distorted field, the existing structure cannot adapt to the uneven flow field distribution of the inlet gas on the same cross section, and cannot achieve uniform temperature distribution at the outlet cross section.

[0003] This patent proposes a cooling device with a stepped arrangement that can adapt to different intake conditions. Injection points with different performance distributions are set on the intake duct jet device, and cooling areas with different flow gradient arrangements are set, so that the jet area covers a wide flow and spray range. The spray full coverage method and distribution are adopted between the injection points to effectively improve and optimize the outlet temperature distribution of different intake distribution fields, and ensure the uniformity of the engine intake temperature.

[0004] The existing technical solution and prior art are jet devices with multiple holes, which are arranged in a uniform distribution or by hole distribution. The main disadvantages are as follows:

[0005] 1. It is impossible to ensure full coverage of the airflow cooling range, which may cause local high temperature and hot spots and fail to achieve the cooling effect.

[0006] 2. It is impossible to take into account the distorted air intake conditions and the injection point layout cannot be adjusted in a targeted manner during use;

[0007] 3. The injection point cannot be set to different flow distribution areas, and the outlet temperature cannot be guaranteed to be uniform for locally distorted airflow. Summary of the invention

[0008] In order to solve the above problems, the present application provides a jet cooling device, comprising:

[0009] An air intake device and a plurality of jet plates, the air intake device comprising an upper wall surface, a lower wall surface and two side walls, each jet plate is installed between the upper wall surface and the lower wall surface, and the plurality of jet plates are arranged at equal intervals on the same cross section of the air intake device;

[0010] Multiple vertical waterways are distributed on both sides of each jet plate, and multiple injection points are distributed at equal height intervals on each waterway. The same side of the jet plate is divided into multiple areas with gradually increasing areas from top to bottom, and nozzles with the same flow rate level are set on the injection points in each area;

[0011] When the air intake is within the first preset range, the water channel on the jet plate at the front end of the airflow direction is opened; when the air intake is within the second preset range, every other water channel on the same side of the jet plate is opened; when the air intake is within the third preset range, all the water channels of the jet plate are opened.

[0012] Preferably, the first preset range is smaller than the second preset range, and the second preset range is smaller than the third preset range.

[0013] Preferably, the angle between the direction of the water mist sprayed from the spray point and the incoming air intake direction is 90 degrees, and the water mist sprayed from the spray point is in an air cone structure, and the cone surface coverage angle is between 80-95 degrees.

[0014] Preferably, the conical water mist surfaces sprayed by two adjacent spraying points in the vertical direction intersect.

[0015] Preferably, the same side of the jet plate is divided into four regions from top to bottom, and the flow ratio of the nozzles in the four regions from top to bottom is 0.5:1:1.5:2.

[0016] Preferably, the ratio of the number of injection points in the four regions from top to bottom is 2:3:4:6.

[0017] Preferably, the water paths on both sides of the same jet plate (20) are arranged in a mirror-image manner or staggered in the direction of airflow.

[0018] Preferably, the injection points on the same side of the jet plate are staggered in height direction.

[0019] Preferably, the distance between adjacent jet plates (20) is greater than the thickness of the jet plates (20).

[0020] Preferably, there is a certain distance between the uppermost nozzle of the jet plate (20) and the upper wall surface, and there is a certain distance between the lowermost nozzle and the lower wall surface, so that the water mist sprayed from the spray point will not be sprayed directly onto the wall surface.

[0021] The advantages of this application include: 1. Realizing wide range of cooling and temperature reduction area coverage of the jet; 2. Realizing excellent atomization and evaporation of the jet water under different intake flow conditions; 3. Realizing uniform temperature distribution at the outlet under uneven or distorted intake conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the installation position of the ejector in a preferred embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the mirror image arrangement of the ejector waterway in a preferred embodiment of the present application;

[0024] Figure 3 This is a schematic diagram of the staggered arrangement of the ejector waterway in a preferred embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the opening of the water channel of the ejector water channel in a preferred embodiment of the present application when the air intake volume is in the second range;

[0026] Figure 5 It is a schematic diagram of the opening of the water channel of the ejector in another preferred embodiment of the present application when the air intake volume is in the second range;

[0027] Figure 6 This is a schematic diagram of the injection point partitioning and parameter distribution on each side of the jet plate in another preferred embodiment of the present application;

[0028] Figure 7 is a schematic diagram of the spray direction of the nozzle hole from a top view of another preferred embodiment of the present application;

[0029] Figure 8 It is a schematic diagram of the spray direction of the nozzle from the perspective of the airflow direction of another preferred embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0031] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0032] like Figure 1-Figure 7As shown in the schematic diagram, the present invention provides a stepped jet cooling device solution that can adapt to different intake conditions, which mainly includes a plurality of jet plates 20, which are installed on the middle section of the intake device 10 and fixedly assembled from top to bottom. The jet plates are arranged at equal intervals on the same section, and the intervals are much larger than the thickness of the jet plates. Multiple rows of nozzles 30 are respectively provided on both sides of the jet plates, and the nozzles in the same row are connected by a branch pipe. A certain distance should be left between the uppermost nozzle and the lowermost nozzle in the same row and the intake shell.

[0033] The jet plates 20 arranged on the air intake section are arranged in a mirror-like manner side by side. The jet plates on both sides of the air intake cavity need to reserve a certain space below the air intake device cavity. The space width is about 3 times the radial width of the jet plate. Different injection areas are arranged on a single jet plate, and the space coverage of the injection area reaches 100%. The arrangement scheme is as follows: Figure 1-Figure 3 As shown, it can be used Figure 2 The row distribution in the Figure 3 All jet plates mainly include two spray areas, positive and negative, with a total of 8 spray columns, 4 on each side, such as Figure 4-Figure 5 As shown, in the specific structural scheme, 2, 4, 6, and 8 are on the same side, and 1, 3, 5, and 7 are on the other side of the jet plate. There are a total of eight water columns, and each water column is provided with 6-10 injection point positions. All injection points are distributed at equal height intervals on the jet plate and are at the same axial position along the airflow direction.

[0034] Jet nozzles of different area groups are set on the injection point on the same side of the jet plate, which are divided into 4 areas from top to bottom, such as Figure 6 As shown, each area is provided with different injection points, 12 nozzles with the same flow level are designed in the first area, 8 nozzles with the same flow level are set in the second area, 6 nozzles with the same flow level are set in the third area, and 4 nozzles with the same flow level are set in the fourth area.

[0035] The main parameters of the device described in the present invention are as follows:

[0036] The water channels on the back of the ejector are spaced apart, with the same spacing, and the number of ejection points on both sides is 1:1;

[0037] The front and back sides of the jet are divided into multiple spraying zones. The design can be adjusted according to the situation. The zone should be 2-6 zones.

[0038] The ejector jet described in the present invention is divided into four regions, and the number of regional injection points and flow rate are both stepped distribution. The main parameters include: the ratio of the number of injection points in the four regions (from bottom to top) is 6:4:3:2,

[0039] The flow numbers of multiple injection point positions in each area of ​​each ejector plate of the ejector are consistent, but the four areas are different, and the ratio of the single-point injection flow numbers in each of the four areas is 4:3:2:1;

[0040] The injection direction of the ejector's injection point is at an angle of 90 degrees to the incoming air intake direction, and the injection point sprays in an air cone structure, with the cone surface coverage angle between 80-95 degrees.

[0041] The jet cooling device has the following working mode: the jet points of two adjacent jet plates have the same working mode, the water channels 101, 103, 105, 107 and 102, 104, 106, 108 on both sides of the jet plates spray crosswise, and the spray direction is perpendicular to the airflow direction, such as Figure 7 The water circuits on the ejector have three working modes in total. When the air intake is low, the 2nd and 3rd circuits (102, 103 injection) of all the ejector plates in the ejector device work. When the air intake increases to a certain level, the 2nd, 3rd, 6th, and 7th circuits (102, 103, 106, and 107 injection) work simultaneously. When the air intake continues to increase, the 8th water circuit (101-108 injection) works simultaneously. When the aerospace plane is in a high Mach number flight state, its inlet airflow distribution may be distorted, resulting in a high intake pressure below the incoming air, and uneven velocity distribution along the inlet cross-section position. When the state is high, the distortion is more obvious. At this time, the structure described in this patent has a partitioned multi-nozzle design, and adopts different flow gradient designs in the nozzle design to ensure that in a low state, when the incoming flow temperature is higher than the engine allowable range but slightly over-temperature, some injection points are sprayed in a small state to ensure the atomization effect of each injection point, thereby improving the evaporation efficiency and ensuring the jet effect in a small state. When the inlet state is high, the inlet duct temperature is high. At this time, all nozzles are opened to ensure the atomization of each injection point, so as to ensure effective evaporation and heat absorption and cooling. This design can ensure that the jet liquid is well atomized in the entire working range. At the same time, under the condition of airflow distortion, its partitioned and gradient flow design can effectively adjust the structure for effective cooling and temperature distribution, and can effectively ensure a good temperature field distribution of the outlet section of the inlet duct jet section.

[0042] This application is aimed at the case where the air-space plane may have a distorted inlet airflow distribution under a high Mach number flight state, resulting in a high intake pressure below the incoming air, and uneven velocity distribution along the inlet cross-section position. When the state is high, the distortion is more obvious. At this time, the structure described in this patent has a partitioned multi-nozzle design, and adopts different flow gradient designs in the nozzle design to ensure that in a low state, when the incoming flow temperature is higher than the engine allowable range but slightly over-temperature, some injection points are sprayed in a small state to ensure the atomization effect of each injection point, thereby improving the evaporation efficiency and ensuring the jet effect in a small state. When the inlet state is high, the inlet duct temperature is high. At this time, all nozzles are opened to ensure the atomization of each injection point, so as to ensure effective evaporation, heat absorption and cooling. This design can ensure that the jet liquid is well atomized in the entire working range. At the same time, under the condition of airflow distortion, its partitioned and gradient flow design can effectively adjust the structure for effective cooling and temperature distribution, and can effectively ensure a good temperature field distribution of the outlet section of the inlet duct jet section.

[0043] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A jet cooling device, characterized in that: include: An air intake device (10) and a plurality of jet plates (20), the air intake device (10) comprising an upper wall surface, a lower wall surface and two side walls, each jet plate (20) being installed between the upper wall surface and the lower wall surface, and the plurality of jet plates (20) being arranged at equal intervals on the same cross section of the air intake device (10); A plurality of vertical waterways are respectively distributed on both sides of each jet plate (20), and a plurality of injection points are distributed at equal height intervals on each waterway. The same side of the jet plate is divided into a plurality of regions with gradually increasing areas from top to bottom, and nozzles with the same flow rate level are arranged on the injection points in each region; When the air intake volume is within a first preset range, the water channel on the jet plate (20) located at the front end in the airflow direction is opened; when the air intake volume is within a second preset range, every other water channel on the same side of the jet plate (20) is opened; and when the air intake volume is within a third preset range, all the water channels of the jet plate (20) are opened.

2. The jet cooling device according to claim 1, characterized in that: The first preset range is smaller than the second preset range, and the second preset range is smaller than the third preset range.

3. The jet cooling device according to claim 1, characterized in that: The angle between the direction of the water mist sprayed from the spray point and the incoming air intake direction is 90 degrees. The water mist sprayed from the spray point presents an air cone structure, and the cone coverage angle is between 80-95 degrees.

4. The jet cooling device according to claim 3, characterized in that: The conical water mist surfaces sprayed by two adjacent spray points in the vertical direction intersect.

5. The jet cooling device according to claim 1, characterized in that: The same side of the jet plate is divided into four areas from top to bottom, and the flow ratio of the nozzles in the four areas from top to bottom is 0.5:1:1.5:

2.

6. The jet cooling device according to claim 1, characterized in that: The ratio of the number of injection points in the four areas from top to bottom is 2:3:4:

6.

7. The jet cooling device according to claim 1, characterized in that: The water channels on both sides of the same jet plate (20) are arranged in a mirror image or staggered in the airflow direction.

8. The jet cooling device according to claim 1, characterized in that: The injection points on the same side of the jet plate are staggered in height direction.

9. The jet cooling device according to claim 1, characterized in that: The distance between adjacent jet plates (20) is greater than the thickness of the jet plates (20).

10. The jet cooling device according to claim 3, characterized in that: There is a certain distance between the uppermost nozzle of the jet plate (20) and the upper wall surface, and there is a certain distance between the lowermost nozzle and the lower wall surface, so that the water mist sprayed from the spray point will not be sprayed directly onto the wall surface.

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