A test device and method for combustion chamber head fuel injection performance

Abstract

The present application relates to the technical field of combustion chamber design, more particularly to a device and method for testing fuel injection performance of a combustion chamber head, the device comprising a head fixing plate for fixing the combustion chamber head, a fuel supply device connected to the combustion chamber head via a hose for supplying fuel to the combustion chamber head, an image acquisition device for acquiring images of a fuel injection performance test plate, an illumination device for providing illumination to an image acquisition area of the image acquisition device, and a fuel injection performance test plate located directly below the image acquisition device for calibrating a background image and / or collecting injected fuel and displaying fuel distribution, wherein the fuel is added with a fluorescent component. Through detailed calibration, testing and photographing arrangement, combined with fluorescent imaging technology, the fuel injection performance of the combustion chamber head of an aero-engine and each injection position can be effectively verified and analyzed.

Description

Technical Field

[0001] This invention relates to the field of combustion chamber design technology for aero-engines and gas turbines, and more specifically, to a testing device and method for the fuel injection performance of the combustion chamber head. Background Technology

[0002] During operation, aircraft engines and gas turbines typically require very low levels of pollutants. The combustion chamber, as a key component in the chemical reaction between fuel and air to release heat, plays a decisive role in the overall emission levels due to the pollutants generated during its combustion process. With increasingly stringent environmental standards, the level of pollutant generation has become a critical performance indicator in the development of combustion chamber components. Among the various pollutants generated in the combustion chamber, nitrogen oxides (NOx) have adverse effects on both the atmospheric environment and human health, and are difficult to remove during combustion; therefore, the requirements for their emission are becoming increasingly stringent.

[0003] To meet the growing demand for reducing pollutant emissions, especially NOx emissions, a common strategy in combustor development is to employ premixed combustion of fuel to lower combustion temperatures. To achieve this premixed combustion effect, the design of the combustor's fuel injection nozzle must ensure that the air and fuel are mixed as uniformly as possible before combustion to prevent the formation of localized high-temperature zones during subsequent combustion, thereby avoiding excessive NOx formation.

[0004] To achieve the most uniform premixing of fuel and air as possible, the head design disperses the fuel by injecting it at multiple locations, such as multi-point injection, thereby expanding the area of ​​fuel-air contact and mixing. In the head design, the fuel flow rate at each injection point should be as uniform as possible to improve the consistency of fuel-air mixing at each location, or to meet design expectations. However, during actual manufacturing and assembly, limitations imposed by specific processes and materials lead to differences in fuel flow rates at different injection points. Therefore, the fuel injection performance at each location on the head must be tested before installation.

[0005] When testing fuel injection flow rates at multiple locations on the combustion chamber head, the most common traditional method is direct collection. This involves collecting fuel injected from various locations within a certain timeframe and then directly observing the fuel volume or weight to determine its conformity with design values. However, with increasingly stringent NOx emission standards and a growing emphasis on fuel-air premixing uniformity, more fuel injection locations have emerged. In this context, directly collecting post-injection fuel becomes technically more difficult, increasing the complexity and cost of testing equipment. Even for gaseous fuel combustion chamber heads, the extensive use of additive manufacturing to produce complex internal cavities with micro-orifice injection schemes results in exceptionally complex internal flow channels and numerous fuel injection holes, making direct fuel collection virtually impossible.

[0006] To address the challenges in flow testing at various locations of the combustion chamber head with multi-position injection, there is an urgent need to develop low-cost, rapid, and effective testing methods to meet the practical demands of increasingly complex head structures and more diverse injection methods. Summary of the Invention

[0007] The purpose of this invention is to provide a testing device and method for the fuel injection performance of a combustion chamber head, solving the problem that existing technologies make it difficult to effectively and quickly measure the fuel injection performance of multi-position injection combustion chamber heads.

[0008] To achieve the above objectives, the present invention provides a testing device for the fuel injection performance of a combustion chamber head, comprising a head fixing plate, a fuel supply device, a hose, an image acquisition device, a device fixing bracket, a fuel injection performance testing plate, a lighting device, and an overall frame.

[0009] The head fixing plate is installed on the overall frame and is used to fix the combustion chamber head;

[0010] The fuel supply device is mounted on the overall frame and connected to the combustion chamber head via a hose, for supplying fuel to the combustion chamber head;

[0011] The image acquisition device is mounted on the overall frame via a device mounting bracket and is used to acquire images of the fuel injection performance test board.

[0012] The lighting device is installed on the overall frame and provides illumination to the image acquisition area of ​​the image acquisition device.

[0013] The fuel injection performance test plate is mounted on the overall frame and located directly below the image acquisition device. It is used to calibrate the background image and / or collect injected fuel and display the fuel distribution.

[0014] The fuel contains fluorescent components.

[0015] In some embodiments, the lighting device is a shadowless lamp assembly composed of LED beads;

[0016] The image acquisition device is a camera, which is positioned at the very center of the shadowless lamp assembly.

[0017] In some embodiments, the fuel injection performance test panel includes a fuel collection plate;

[0018] The fuel collection plate is a honeycomb porous plate.

[0019] In some embodiments, the testing apparatus further includes a lifting platform and a fuel collection tank.

[0020] The lifting platform is installed on the fuel collection tank and is used to adjust the relative position of the fuel injection performance test plate and the combustion chamber head.

[0021] The fuel collection tank, mounted on the overall frame, collects fuel injection residue.

[0022] In some embodiments, the fuel injection performance test panel includes a test panel and a background panel;

[0023] The test plate, mounted on the lifting platform, is used to record the distribution of fuel after injection. It corresponds to the layout of the injection holes in the combustion chamber head and is used to provide a fluorescent image of the fuel distribution in the injection holes.

[0024] The background plate is used to provide a background image as a comparison reference with the fluorescence image.

[0025] In some embodiments, the test plate is distributed with a plurality of fuel collection heads that match the layout of the injection holes;

[0026] The bottom of the test board serves as a support surface and is connected to the lifting platform.

[0027] In some embodiments, the fuel collection tank has a plurality of collection holes on its top for collecting fuel injection residue.

[0028] To achieve the above objectives, the present invention provides a method for testing the fuel injection performance of the combustion chamber head, which is implemented using the aforementioned test device for the fuel injection performance of the combustion chamber head, wherein the fuel injection performance test plate of the test device includes a fuel collection plate.

[0029] The testing method includes the following steps:

[0030] Turn on the lights of the lighting equipment, adjust the lighting parameters, and use the image acquisition equipment to perform background imaging on the fuel collection plate to obtain a background image;

[0031] Turn off the lights, move the combustion chamber head to the test position, and align it with the fuel collection plate to prepare for fuel injection;

[0032] Start the fuel supply and inject the fuel with fluorescent components into the fuel collection plate through the fuel injection hole;

[0033] After fuel injection is completed, remove the combustion chamber head;

[0034] Turn on the lights of the illumination device, acquire the fluorescent image of the fuel collection plate through the image acquisition device, and record the fuel distribution after injection;

[0035] Imaging analysis of fluorescence images on the fuel collection plate;

[0036] The combustion chamber head injection performance was obtained based on the analysis results.

[0037] In some embodiments, the step of imaging and analyzing the fluorescence image on the fuel collection plate and obtaining the combustion chamber head injection performance based on the analysis results further includes:

[0038] The fluorescence image was compared with the background image to analyze the size of the fluorescence region and the light intensity distribution at each location;

[0039] Extract information on the fuel distribution area and fuel concentration at each location injected into the combustion chamber head;

[0040] Evaluate the fuel injection characteristics of the combustion chamber head to determine whether they meet design requirements.

[0041] To achieve the above objectives, the present invention provides a method for testing the fuel injection performance of each injection hole in the combustion chamber head, which is implemented using the combustion chamber head fuel injection performance testing device described above. The fuel injection performance testing plate of the testing device includes a testing plate and a background plate.

[0042] The testing method includes the following steps:

[0043] Install the test board and move the combustion chamber head to the test position;

[0044] Adjust and record the relative position of the test plate and the combustion chamber head, then remove the combustion chamber head;

[0045] Place the background board on the test board and adjust the background board to the recording position;

[0046] Turn on the lights of the lighting equipment, and use the image acquisition device to image the background of the background panel to obtain the background image;

[0047] Turn off the lights and move the backdrop away;

[0048] Move the combustion chamber head back to the test position and adjust the position of the test plate to align the test plate with the relative position of the head injection hole;

[0049] Start the fuel supply and inject the fuel with fluorescent components into the test plate through the fuel injection port. After completion, remove the combustion chamber head.

[0050] Adjust the height of the test board and reposition the background board;

[0051] Turn on the lights of the illumination device, acquire the fluorescence image on the test board through the image acquisition device, and record the spraying results;

[0052] Imaging analysis was performed on the fluorescence images on the test plate;

[0053] The injection performance of each injection hole in the combustion chamber head was obtained based on the analysis results.

[0054] In some embodiments, the step of performing imaging analysis on the fluorescence image on the test plate and obtaining the injection performance of each injection orifice in the combustion chamber head based on the analysis results further includes:

[0055] The fluorescence images of the test plate were analyzed to extract the fluorescence regions and fluorescence intensities.

[0056] By comparing the design parameters of the injection orifice with the background image, the actual injection flow rate and distribution characteristics of the injection orifice can be obtained.

[0057] In some embodiments, the step of performing imaging analysis on the fluorescence image on the test plate and obtaining the injection performance of each injection orifice in the combustion chamber head based on the analysis results further includes:

[0058] By determining the location of the fluorescent area, we can identify the difference between the actual opening position and direction of the injection hole and the design parameters.

[0059] The difference between the actual opening size of the injection hole and the design parameters is determined by the fluorescence intensity.

[0060] The present invention proposes a test device and method for fuel injection performance of the combustion chamber head. Through detailed calibration, testing and photographic setup, combined with fluorescence imaging technology, it effectively verifies and analyzes the fuel injection performance of the combustion chamber head and various injection positions of an aero-engine. It can provide reliable data support for the optimized design and performance improvement of the combustion chamber head, and helps to improve the combustion efficiency and overall performance of the combustion chamber. Attached Figure Description

[0061] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0062] Figure 1 A structural diagram of an aircraft engine according to an embodiment of the present invention is disclosed;

[0063] Figure 2 A combustion chamber structural diagram according to an embodiment of the present invention is disclosed;

[0064] Figure 3a A three-dimensional cross-sectional view of the combustion chamber head according to an embodiment of the present invention is disclosed;

[0065] Figure 3b A three-dimensional cross-sectional view of a mixing tube according to an embodiment of the present invention is disclosed;

[0066] Figure 4 A first arrangement schematic diagram of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is disclosed.

[0067] Figure 5 A flowchart of a method for testing the fuel injection performance of a combustion chamber head according to an embodiment of the present invention is disclosed;

[0068] Figure 6a A second arrangement schematic diagram of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is disclosed;

[0069] Figure 6b A schematic diagram of a test photograph of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is shown;

[0070] Figure 7 A flowchart of a method for testing the fuel injection performance of each injection hole in the combustion chamber head according to another embodiment of the present invention is disclosed;

[0071] Figure 8a A first arrangement schematic diagram of a combustion chamber head fuel injection performance testing device according to yet another embodiment of the present invention is disclosed.

[0072] Figure 8b A test photographic schematic diagram of the first arrangement of the combustion chamber head fuel injection performance testing device according to yet another embodiment of the present invention is shown;

[0073] Figure 9a A second schematic diagram of a combustion chamber head fuel injection performance testing device according to yet another embodiment of the present invention is disclosed;

[0074] Figure 9b A test photographic schematic diagram of the second arrangement of the combustion chamber head fuel injection performance testing device according to yet another embodiment of the present invention is shown;

[0075] Figure 10 A schematic diagram of the fuel injection distribution after a fuel injection performance test of each injection hole in the combustion chamber head according to another embodiment of the present invention is disclosed.

[0076] The meanings of the labels in the figures are as follows:

[0077] 100 fan; 200 low-pressure compressor; 300 high-pressure compressor; 400 combustion chamber; 500 high-pressure turbine; 600 low-pressure turbine; 700 fan casing;

[0078] 410 Diffuser; 420 Outer Combustion Chamber; 430 Inner Combustion Chamber; 440 Outer Combustion Chamber Flame Tube; 450 Inner Combustion Chamber Flame Tube; 460 Fuel Rod; 470 Combustion Chamber Head;

[0079] 471 Air; 472 Head body; 473 Mixing pipe; 474 Fuel; 475 Fuel pipe; 476 Fuel injection port;

[0080] 801 Head fixing plate; 802 Fuel supply device; 803 Hoses; 804 Camera; 805 Camera bracket; 806 Shadowless lamp assembly; 807 Fuel collection plate; 808 Overall frame; 809 Spray; 810 Fuel distribution;

[0081] 901 Test plate; 902 Lifting platform; 903 Fuel collection tank; 904 Background plate; 905 Fuel collection head; 906 Collection hole; 907 Residual fuel. Detailed Implementation

[0082] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0083] The present invention proposes a test device and method for fuel injection performance of the combustion chamber head, which does not rely on direct measurement of fuel flow. Based on fluorescence imaging, it can quickly measure the fuel injection performance of the combustion chamber head and various internal locations, meeting the fuel injection performance testing needs of more complex combustion chamber heads.

[0084] The invention will now be described in further detail below, taking the combustion chamber head of an aero-engine as an example, with reference to the accompanying drawings. In other embodiments, it may also be a gas turbine combustion chamber.

[0085] Figure 1 A structural diagram of an aero-engine according to an embodiment of the present invention is disclosed, such as... Figure 1 As shown, the aero engine consists of a fan 100, a low-pressure compressor 200, a high-pressure compressor 300, a combustion chamber 400, a high-pressure turbine 500, a low-pressure turbine 600, and a fan casing 700.

[0086] The fan 100, located at the front of the engine, is directly connected to the low-pressure compressor 200. It is used to draw in air and divide it into core airflow and bypass airflow to generate thrust.

[0087] The low-pressure compressor 200 is installed at the rear of the fan 100 and connected to the high-pressure compressor 300. It is used to initially compress the core airflow and increase the air pressure.

[0088] The high-pressure compressor 300 is located after the low-pressure compressor 200 and is connected to the combustion chamber 400 to further compress the air and bring it to the high-pressure state required for combustion.

[0089] The combustion chamber 400 is connected to the high-pressure compressor 300 and the high-pressure turbine 500, which mix and burn air and fuel to produce high-temperature and high-pressure gas.

[0090] The high-pressure turbine 500 is installed after the combustion chamber 400 and connected to the low-pressure turbine 600. It uses high-temperature and high-pressure gas to do work and drive the high-pressure compressor 300.

[0091] The low-pressure turbine 600 is located after the high-pressure turbine 500 and is connected to the fan 100 via a shaft system. It uses the residual pressure gas to do work and drive the low-pressure compressor 200 and the fan 100.

[0092] The fan housing 700 surrounds the outside of the fan 100, encloses and supports the fan and part of the low-pressure compressor 200, protects the internal structure of the engine, and provides stability to the overall structure.

[0093] Fan 100 draws in air, which is then compressed in stages by low-pressure compressor 200 and high-pressure compressor 300 before entering combustion chamber 400. The high-temperature gas produced by combustion sequentially drives high-pressure turbine 500 and low-pressure turbine 600 to perform work, thereby driving low-pressure compressor 200, high-pressure compressor 300 and fan 100 to complete the cycle.

[0094] Figure 2 A combustion chamber structural diagram according to an embodiment of the present invention is disclosed, such as... Figure 2 As shown, the combustion chamber 400 consists of a diffuser 410, an outer combustion chamber casing 420, an inner combustion chamber casing 430, an outer combustion chamber flame tube 440, an inner combustion chamber flame tube 450, a fuel rod 460, and a combustion chamber head 470.

[0095] The diffuser 410 decelerates and pressurizes the high-speed airflow from the high-pressure compressor, improving combustion efficiency. It is located at the combustion chamber inlet and connected to the outer casing 420 and the inner casing 430 of the combustion chamber.

[0096] The outer casing 420 of the combustion chamber cooperates with the inner casing 430 of the combustion chamber to fix the flame tube, enclose the structure of the combustion chamber 400, and is used for air flow and to provide external support.

[0097] The inner combustion chamber casing 430 is located inside the combustion chamber 400, fixing the inner combustion chamber flame tube 440 and forming an annular space with the outer combustion chamber casing 420 for airflow and to provide internal support.

[0098] The outer flame tube 440 of the combustion chamber is installed inside the outer casing 420 of the combustion chamber and is connected to the head 470 of the combustion chamber. It forms an outer annular cavity with the outer casing 420 of the combustion chamber and is used to guide and stabilize the airflow in the outer annular cavity.

[0099] The flame tube 450 inside the combustion chamber is connected to the combustion chamber casing 430 and the combustion chamber head 470, forming an inner annular cavity with the combustion chamber casing 430, which is used to guide and stabilize the airflow in the inner annular cavity.

[0100] The fuel rod 460 connects the external fuel supply device of the combustion chamber to the combustion chamber head 470, passes through the outer casing 420 of the combustion chamber, and is fixed to the combustion chamber head 470, and is responsible for inputting fuel into the combustion chamber head 470.

[0101] The combustion chamber head 470 provides a place for mixing air and fuel, mixing the fuel input from the fuel rod 460 with air to provide a combustible mixture for subsequent combustion, ensuring the start-up and stable operation of combustion.

[0102] The air supplied by the high-pressure compressor 300 is decelerated by the diffuser 410 and enters the combustion chamber head 470. The fuel input by the fuel rod 460 is mixed in the combustion chamber head 470. The resulting combustible mixture enters the annular flame tube surrounded by the outer flame tube 440 and the inner flame tube 450 of the combustion chamber and is then combusted before being output to the high-pressure turbine 500.

[0103] Figure 3a A three-dimensional cross-sectional view of the combustion chamber head according to an embodiment of the present invention is disclosed, such as... Figure 3a The combustion chamber head 470 shown includes a head body 472, a mixing pipe 473, a fuel pipe 475, and a fuel injection port 476.

[0104] The head body 472, as the core structure of the combustion chamber head 470, connects the air inlet and the fuel pipe 475.

[0105] The head body 472 contains a mixing tube 473 and a cavity, providing space for mixing air and fuel.

[0106] The mixing tube 473 is connected to the cavity inside the head body 472 and is responsible for guiding the air and fuel to mix and sending the combustible mixture into the annular flame tube surrounded by the outer flame tube 440 and the inner flame tube 450 of the combustion chamber.

[0107] Fuel pipe 475 connects fuel rod 460 and head body 472, delivering fuel 474 to the cavity inside head body 472. Fuel 474 then enters mixing pipe 473 through fuel injection hole 476 on mixing pipe 473 and mixes with air.

[0108] Air 471 entering the combustion chamber head 470 mixes with fuel 474 in the mixing pipe 473 on the head body 472, and the mixed combustible mixture enters the annular flame tube surrounded by the outer flame tube 440 and the inner flame tube 450 of the combustion chamber.

[0109] Figure 3b A three-dimensional cross-sectional view of a mixing tube according to an embodiment of the present invention is disclosed, such as... Figure 3b As shown, the mixing pipe 473 further includes a fuel injection port 476.

[0110] The fuel injection hole 476 is disposed on the mixing pipe 473 and is used to inject fuel evenly, thereby improving the uniformity of fuel injection through multi-point injection.

[0111] Air 471 is introduced from the outside into the combustion chamber head 470 and enters the mixing pipe 473 through the head body 472. Fuel 474 is fully mixed with air 471 through the fuel injection hole 476 on the mixing pipe 473 and then enters the combustion chamber 400, where it is burned.

[0112] Figure 4 A structural diagram of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is disclosed, as follows: Figure 4 As shown, the present invention proposes a test device for fuel injection performance of a combustion chamber head, comprising a head fixing plate 801, a fuel supply device 802, a hose 803, an image acquisition device, a device fixing bracket, a fuel injection performance test plate, a lighting device, and an overall frame 808.

[0113] The head fixing plate 801 is installed on the overall frame 808 and is used to fix the combustion chamber head 470 to ensure its stability in the test device.

[0114] The head fixing plate 801 can be adjusted in position on the overall frame 808 as needed for the test.

[0115] The fuel supply device 802 is installed on the overall frame 808 and is connected to the combustion chamber head 470 via a hose 803, for supplying fuel to the combustion chamber head 470.

[0116] The fuel supply device 802 integrates fuel storage, metering and pressurization functions, and fuel 474 with added fluorescent components is stored in the fuel supply device 802.

[0117] The hose 803 connects the fuel supply device 802 to the combustion chamber head 470 and is used to deliver fuel 474, ensuring that the fuel enters the head at the appropriate pressure and flow rate.

[0118] The image acquisition device is mounted on the overall frame 808 via a device fixing bracket and is used to acquire images of the fuel injection performance test board.

[0119] The lighting device is installed on the overall frame 808 and provides illumination to the image acquisition area of ​​the image acquisition device.

[0120] The fuel injection performance test plate is mounted on the overall frame 808 and located directly below the image acquisition device. It is used to calibrate the background image and / or collect injected fuel and display the fuel distribution.

[0121] The fuel contains fluorescent components.

[0122] In this embodiment, the image acquisition device is a camera 804, which is used to acquire images of the fuel injection performance test board and capture images of the distribution of the injected fuel.

[0123] The device mounting bracket is a camera bracket 805, which is used to support and fix the camera 804 to ensure the camera position is stable.

[0124] Furthermore, the camera bracket 805 is mounted on the overall frame 808 and its height and angle can be adjusted according to testing needs.

[0125] The lighting device is a shadowless lamp assembly 806 composed of LED beads, which provides uniform and shadowless illumination to the shooting area. The shadowless lamp assembly 806 is integrated with the camera bracket 805 to ensure consistent light distribution.

[0126] In this embodiment, the fuel injection performance test plate includes a fuel collection plate 807;

[0127] The camera 804 is positioned directly opposite the fuel collection plate 807 and is located at the very center of the shadowless lamp assembly 806.

[0128] In this embodiment, the fuel collection plate 807 is a honeycomb porous plate located directly below the camera 804, used to collect injected fuel and display the fuel distribution. Its honeycomb porous structure improves the visualization of fuel distribution. In practical applications, other forms of porous plates may be used.

[0129] The overall frame 808 supports the entire testing device, including the head fixing plate 801, fuel supply device 802, camera bracket 805, shadowless lamp assembly 806, and fuel collection plate 807. The overall frame 808 is adjustable to meet the arrangement requirements under different test conditions.

[0130] In this embodiment, the power lines, signal lines, computers, and other equipment required for the operation of the fuel supply device 802, camera 804, and shadowless lamp assembly 806 are not illustrated separately.

[0131] Based on the aforementioned testing device for combustion chamber head fuel injection performance, this invention proposes a testing method for combustion chamber head fuel injection performance.

[0132] Figure 5 A flowchart of a method for testing the fuel injection performance of a combustion chamber head according to an embodiment of the present invention is disclosed, as follows: Figure 5 As shown, the present invention proposes a method for testing the fuel injection performance of a combustion chamber head, which can be used to test the fuel injection performance of the aforementioned combustion chamber head 470, and includes the following steps:

[0133] Step S101, turn on the lights and calibrate the parameters: turn on the lights of the lighting device, adjust the lighting parameters, and use the image acquisition device to perform background imaging on the fuel collection plate to obtain a background image;

[0134] Step S102, turn off the lights and move the head: turn off the lights, move the combustion chamber head to the test position, and align it with the fuel collection plate to prepare for fuel injection;

[0135] Step S103, Start fuel: Start fuel supply;

[0136] Step S104, fuel injection to the collection plate: fuel with added fluorescent components is injected into the fuel collection plate through the fuel injection hole;

[0137] Step S105, Remove the head: After fuel injection is completed, remove the combustion chamber head;

[0138] Step S106, turn on the lights and take pictures: turn on the lights of the lighting device, acquire the fluorescent image on the fuel collection plate through the image acquisition device, and record the fuel distribution after injection;

[0139] Step S107, analyze fluorescence imaging of the collection plate: perform imaging analysis on the fluorescence image of the fuel collection plate;

[0140] Step S108, Obtain the head injection performance: Based on the analysis results, obtain the combustion chamber head injection performance.

[0141] Figure 4 A schematic diagram of the first arrangement of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is disclosed. The first arrangement position is the arrangement position for pre-test calibration and post-test photography.

[0142] Figure 6a A second arrangement schematic diagram of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is disclosed. The second arrangement position is the arrangement position during testing, that is, the combustion chamber head is in the testing position. Figure 6b A schematic diagram of a test photograph of a combustion chamber head fuel injection performance testing device according to an embodiment of the present invention is shown.

[0143] The following is combined Figure 4 , Figure 6a and Figure 6b The detailed steps of the test method for the fuel injection performance of the combustion chamber head proposed in this invention are described below.

[0144] Step S101: Turn on the lights and calibrate the parameters.

[0145] like Figure 4 As shown, the combustion chamber head fuel injection performance testing device is located in the first arrangement position. The shadowless lamp group 806 is turned on, and the camera 804 takes pictures of the fuel collection plate 807 without fuel distribution and records the background image.

[0146] By calibrating the background image under fuel-free distribution conditions, a benchmark is provided for subsequent analysis, ensuring test accuracy and clear contrast with the background image.

[0147] Step S102: Turn off the lights and move the head in.

[0148] like Figure 6a As shown, the combustion chamber head fuel injection performance testing device is located in the second arrangement position. The shadowless lamp group 806 is turned off, and the combustion chamber head 470 is moved above the fuel collection plate 807 in the dark environment.

[0149] Step S103: Start the fuel.

[0150] The fuel supply device 802 delivers fuel 474 with added fluorescent components to the combustion chamber head 470 through a hose 803.

[0151] Step S104: Fuel is injected into the fuel collection plate.

[0152] Fuel 474 with added fluorescent components was injected into the fuel collection plate 807 to simulate the injection effect under actual working conditions, and the performance of the combustion chamber head 470 in actual operation was directly tested, including the uniformity and stability of fuel injection flow rate, injection angle, and injection range.

[0153] The actual fuel injection process in the combustion chamber is simulated. Fuel 474 is injected through the combustion chamber head 470 to form a spray 809. After the fuel injection is completed, a fuel distribution 810 with a certain area is generated on the fuel collection plate 807 for analyzing the injection performance.

[0154] Step S105: Remove the head.

[0155] After injection, the combustion chamber head 470 is moved away from above the fuel collection plate 807.

[0156] like Figure 4As shown, the combustion chamber head fuel injection performance testing device is located in the first arrangement position, providing a field of view for subsequent fluorescence imaging of fuel distribution, and avoiding obstruction of the imaging process by the head structure.

[0157] Step S106: Turn on the lights and take a picture.

[0158] The shadowless lamp assembly 806 is turned on again, and the fluorescent image formed on the fuel collection plate 807 is captured by the camera 804.

[0159] When taking photos after testing, the lights are turned on. The fluorescent components in the fuel distributed on the fuel collection plate 807 are excited by the ultraviolet light in the shadowless lamp group 806 to form unique fluorescence. By using the camera 804 with a filter of a specific spectrum, the fluorescence of the fuel distributed on the fuel collection plate 807 can be imaged.

[0160] like Figure 6b As shown, the fuel distribution 810 generated on the fuel collection plate 807 is photographed by camera 804 to obtain a fluorescence image of the fuel distribution.

[0161] Step S107: Analyze the fluorescence imaging of the collection plate.

[0162] The captured fluorescence images were compared with the background images recorded during calibration to analyze the size of the fluorescence region and the light intensity distribution at each location.

[0163] Thus, information on fuel distribution area and fuel concentration at each location is extracted to determine performance parameters such as uniformity of injection at the combustion chamber head 470, injection angle, and fuel concentration distribution.

[0164] Step S108, obtain the head jet performance.

[0165] By combining fluorescence image analysis data with design values, the injection performance of the combustion chamber head 470 was evaluated.

[0166] By analyzing parameters such as fuel injection area and concentration distribution, we can determine whether the head injection performance meets the design requirements and optimize the design or operating parameters.

[0167] Under the pre-set computer program processing, the background image without fuel distribution taken during the previous calibration is compared. By analyzing the size of the fluorescent area and the light intensity distribution at each position, the fuel distribution area and fuel concentration at each position of the combustion chamber head 470 are obtained, that is, the fuel injection characteristics of the combustion chamber head 470. Thus, the degree to which the performance of the combustion chamber head 470 and the fuel injection is consistent with the design value is judged.

[0168] In another embodiment, the combustion chamber head fuel injection performance testing device proposed in this invention can also be used to test the fuel injection performance of each injection hole in the combustion chamber head.

[0169] Reference Figures 8a to 9b When testing the fuel injection performance of each injection hole in the combustion chamber head, the testing device for the fuel injection performance of the combustion chamber head proposed in this invention further includes a lifting platform 902 and a fuel collection tank 903.

[0170] The lifting platform 902 is installed on the fuel collection box 903 and is used to adjust the relative position of the fuel injection performance test plate and the combustion chamber head 470.

[0171] The fuel collection tank 903 is installed on the overall frame 808 and collects fuel injection residue.

[0172] When testing the fuel injection performance of each injection hole in the combustion chamber head, the fuel injection performance test plate includes a test plate 901 and a background plate 904.

[0173] The test plate 901 is installed on the lifting platform 902 and is used to record the distribution of fuel after injection. It corresponds to the layout of the injection holes in the combustion chamber head 470 and is used to provide a fluorescent image of the fuel distribution in the injection holes.

[0174] The background plate 904 is used to provide a background image as a comparison reference with the fluorescence image of the fuel distribution in the injection holes.

[0175] The test plate 901 has several fuel collection heads 905 distributed on it, which are matched with the layout of the injection holes;

[0176] The bottom of the test board 901 is a support surface, which is connected to the lifting platform 902.

[0177] The background plate 904 is placed above the test plate 31 during use. Its surface also needs to have several through holes that match the injection hole layout, allowing the fuel collection head 905 of the test plate 901 to be exposed. Please refer to [reference needed]. Figure 8b .

[0178] Based on the aforementioned testing device for fuel injection performance in the combustion chamber head, this invention also proposes a method for testing the fuel injection performance of each injection hole in the combustion chamber head.

[0179] Figure 7 A flowchart illustrating a method for testing the fuel injection performance of each injection orifice within the combustion chamber head according to another embodiment of the present invention is disclosed, as follows: Figure 7 As shown, the method for testing the fuel injection performance of each injection hole inside the combustion chamber head proposed in this invention can obtain the fuel injection performance of each fuel injection hole 476 inside the combustion chamber head 470 through a matched test plate, specifically including the following steps:

[0180] Step S201, move the head and install the test plate: install the test plate and move the combustion chamber head to the test position.

[0181] Step S202, mark the position and then remove the head: adjust and record the relative position of the test plate and the combustion chamber head, and then remove the combustion chamber head.

[0182] Step S203, Place the background board and restore its position: Place the background board on the test board and adjust the background board to the recording position;

[0183] Step S204, turn on the lights and calibrate the parameters: turn on the lights of the lighting device, and use the image acquisition device to perform background imaging on the background board to obtain a background image;

[0184] Step S205, turn off the lights and remove the background panel: turn off the lights and remove the background panel;

[0185] Step S206, move the head and adjust the test plate: move the combustion chamber head to the test position again and adjust the position of the test plate to align the test plate with the relative position of the head injection hole;

[0186] Step S207, Remove the head after fuel injection: Start the fuel supply and inject the fuel with added fluorescent components into the test plate through the fuel injection hole. After completion, remove the combustion chamber head.

[0187] Step S208, after resetting the test board, place the background board: adjust the height of the test board and reposition the background board;

[0188] Step S209, turn on the lights and capture images: turn on the lights of the illumination device, acquire the fluorescence image on the test board through the image acquisition device, and record the spraying results;

[0189] Step S210, combined with test plate fluorescence imaging: perform imaging analysis on the fluorescence image on the test plate;

[0190] Step S211, obtain the performance test of each injection hole: Based on the analysis results, obtain the injection performance of each injection hole in the combustion chamber head.

[0191] Figure 8a A schematic diagram of the first arrangement of a combustion chamber head fuel injection performance testing device according to another embodiment of the present invention is disclosed. The first arrangement position is the arrangement position for calibration and test photography.

[0192] Figure 8b A test photographic schematic diagram of the first arrangement of the combustion chamber head fuel injection performance testing device according to yet another embodiment of the present invention is shown;

[0193] Figure 9aA second arrangement schematic diagram of a combustion chamber head fuel injection performance testing device according to another embodiment of the present invention is disclosed. The second arrangement position is the arrangement position of the fuel injection process, that is, the combustion chamber head is in the testing position.

[0194] Figure 9b A test photographic schematic diagram of a second arrangement of a combustion chamber head fuel injection performance testing device according to yet another embodiment of the present invention is shown.

[0195] The following is combined Figures 8a to 9b The detailed steps of the test method for the fuel injection performance of each injection hole in the combustion chamber head proposed in this invention are described.

[0196] Step S201: Move the combustion chamber head in and install the test plate.

[0197] like Figure 8a and Figure 9b The bottom of the test plate 901 is a support surface, which is connected to the lifting platform 902. The test plate 901 is installed on the lifting platform 902, and the lifting platform 902 is fixed on the fuel collection box 903.

[0198] Reference Figure 8a and Figure 9b The test plate 901 is designed with a fuel collection head 905 (similar to a sponge material) corresponding to the injection hole, which matches the layout of the injection hole, thereby providing an independent fuel collection and analysis unit for each injection hole and ensuring test accuracy.

[0199] Move the combustion chamber head 470 into the test position (directly above the test plate 901), and adjust the height of the lifting platform 902 so that the fuel collection head 905 of the test plate 901 is accurately aligned with the injection position of each fuel injection hole 476 in the combustion chamber head 470. This ensures that the fuel from the injection holes falls accurately at the corresponding position on the test plate 901, avoiding positional deviation from affecting the test results.

[0200] Step S202: After marking the position, remove the combustion chamber head.

[0201] Adjust the height of the lifting platform 902 so that the relative position of the test plate 901 and the combustion chamber head 470 meets the requirements for spray measurement of each injection hole in the head, and record the height position of the lifting platform 902 as the calibration position.

[0202] Remove the combustion chamber head 470° and preserve the measurement calibration position to ensure consistency in subsequent experimental operations.

[0203] Step S203: Place the background board and restore its position.

[0204] Place the background plate 904 on the test plate 901, and adjust the lifting platform 902 back to the marked calibration position. The position restoration operation ensures that the relative positions of the combustion chamber head 470 and the background plate 904 are accurate, reducing errors caused by positional offset.

[0205] Background board 904 is used for calibration shooting, providing a comparative basis for subsequent fuel distribution imaging.

[0206] Step S204: Turn on the lights and calibrate the parameters;

[0207] like Figure 8b As shown, the shadowless lamp group 806 is turned on, and the camera 804 is started to capture and record the background image of the background board 904. The background image is then calibrated for subsequent fluorescence imaging analysis of residual fuel distribution.

[0208] Step S205: Turn off the lights and remove the background panel;

[0209] Turn off the shadowless light group 806 and remove the background board 904.

[0210] After the lights are turned off, residual light or reflected light should be avoided from interfering with the spraying process during the test to ensure the authenticity of the spraying test.

[0211] Remove the background panel 904 to make room for fuel injection operation and prevent the background panel 904 from being covered by fuel.

[0212] Step S206: Move the head in and adjust the test plate;

[0213] like Figure 9a As shown, move the combustion chamber head 470 into the test position (directly above the test plate 901), adjust the height of the lifting platform 902, and readjust the test plate 901 to the calibration position.

[0214] Adjust the combustion chamber head 470 and the test plate 901 to ensure that each injection hole corresponds to the correct position on the test plate 901. Precise adjustment can ensure that the performance data of the injection holes is true and valid, and provide a reliable basis for subsequent injection hole analysis.

[0215] Step S207: After injecting fuel, remove the head;

[0216] The fuel supply device 802 is activated, and fuel 474 containing fluorescent components is delivered to the combustion chamber head 470 via hose 803. Figure 9b As shown, fuel 474 is injected onto the surface of the fuel collection head 905 on the test plate 901.

[0217] The top of the fuel collection tank 903 is provided with several collection holes 906, through which excess fuel flows into the fuel collection tank 903. After injection, the combustion chamber head 470 is removed.

[0218] This step simulates the actual fuel injection process and observes the injection characteristics of each injection orifice. Fuel containing fluorescent components remains on the surface of the fuel collection head 905 for subsequent performance analysis.

[0219] Remove the combustion chamber head 470° to create the environment for subsequent filming.

[0220] Step S208: After resetting the test board, place the background board.

[0221] Adjust the lifting platform 902 to the calibrated position and reposition the background plate 904 to prepare for fluorescent photography of the spraying results.

[0222] Step S209: Turn on the lights and take an image;

[0223] The lights were turned on again, and camera 804 captured an image of the fluorescence residue distribution on test board 901. The fluorescence distribution formed on test board 901 by the fuel injected from each injection hole was recorded to provide data for performance analysis.

[0224] Step S210, combined with fluorescence imaging of the test plate;

[0225] Figure 10 A schematic diagram of fuel distribution after fuel injection performance testing of each injection orifice in the combustion chamber head according to another embodiment of the present invention is shown, such as... Figure 10 As shown, after fuel injection, residual fuel 907 is distributed on the surface of fuel collection head 905 on test plate 901. The fuel collection head 905 is made of a liquid absorbent material similar to a sponge. By analyzing the area and fluorescence intensity of the fluorescence imaging of residual fuel 907 in each fuel collection head 905, and comparing it with the background image and the position of the fuel injection hole 476 in the design, the actual injection flow rate and distribution characteristics of each fuel injection hole 476 inside the combustion chamber head 470 after actual processing can be obtained.

[0226] For example, by analyzing the distribution of residual fuel 907 on the surface of the fuel collection head 905, i.e. the location of the fluorescent area, the differences between the actual opening position and direction of each fuel injection hole 476 and the design parameters can be analyzed. By analyzing the fluorescence intensity of residual fuel 907 on the surface of the fuel collection head 905, the differences between the opening size of each fuel injection hole 476 and the design parameters can be analyzed.

[0227] Step S211: Obtain the performance test results for each injection hole.

[0228] Based on fluorescence imaging analysis, the injection performance of each injection orifice is summarized, including injection flow rate, distribution characteristics, and deviation. The manufacturing precision and actual injection performance of each injection orifice within 470° of the combustion chamber head are verified. Data support is provided for improving injection orifice design and manufacturing processes.

[0229] Although the methods described above are illustrated and depicted as a series of actions for the sake of simplicity, it should be understood and appreciated that these methods are not limited by the order of the actions, as some actions may occur in a different order and / or concurrently with other actions from the illustrations and descriptions herein or not illustrated and described herein but which may be understood by those skilled in the art, according to one or more embodiments.

[0230] The present invention provides a testing device and method for fuel injection performance at the combustion chamber head, which has the following beneficial effects:

[0231] 1) Reduced testing costs. By employing fluorescence image analysis technology, this invention can quickly obtain the fuel injection performance of the combustion chamber head, avoiding the design and processing requirements for dedicated testing fixtures for each head in traditional performance testing methods that directly collect and measure fuel.

[0232] 2) Reduced testing time. This invention uses image analysis methods to reduce the time required for fuel collection and weighing;

[0233] 3) In-depth analysis of fuel injection performance in the combustion chamber head: For combustion chamber heads with complex structures, this invention can analyze the fuel injection performance at various locations inside the head in detail, which is helpful for the design and optimization of the combustion chamber head.

[0234] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0235] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0236] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0237] Those skilled in the art will understand that information, signals, and data can be represented using any of a variety of different techniques and arts. For example, the data, instructions, commands, information, signals, bits, symbols, and chips described throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or optical particles, or any combination thereof.

[0238] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps are described above in a generalized manner in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as departing from the scope of the invention.

[0239] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A test device for combustion chamber head fuel injection performance, characterized by, Includes headstock mounting plate, fuel supply unit, hoses, image acquisition equipment, equipment mounting bracket, fuel injection performance test plate, lighting equipment, and overall frame: The head fixing plate is installed on the overall frame and is used to fix the combustion chamber head; The fuel supply device is mounted on the overall frame and connected to the combustion chamber head via a hose, for supplying fuel to the combustion chamber head; The image acquisition device is mounted on the overall frame via a device mounting bracket and is used to acquire images of the fuel injection performance test board. The lighting device is installed on the overall frame and provides illumination to the image acquisition area of ​​the image acquisition device. The fuel injection performance test plate is mounted on the overall frame and located directly below the image acquisition device. It is used to calibrate the background image and / or collect injected fuel and display the fuel distribution. The fuel contains fluorescent components.

2. A test device for combustion chamber head fuel injection performance according to claim 1, characterized in that, The lighting device is a shadowless lamp assembly composed of LED beads; The image acquisition device is a camera, which is positioned at the very center of the shadowless lamp assembly.

3. The apparatus of claim 1, wherein, The fuel injection performance test plate includes a fuel collection plate; The fuel collection plate is a honeycomb porous plate.

4. A test device for combustion chamber head fuel injection performance according to claim 1 or claim 2 characterised in that, It also includes a lifting platform and a fuel collection tank: The lifting platform is installed on the fuel collection tank and is used to adjust the relative position of the fuel injection performance test plate and the combustion chamber head. The fuel collection tank, mounted on the overall frame, collects fuel injection residue.

5. A test device for combustion chamber head fuel injection performance according to claim 4, characterized in that, The fuel injection performance test panel includes a test panel and a background panel; The test plate, mounted on the lifting platform, is used to record the distribution of fuel after injection. It corresponds to the layout of the injection holes in the combustion chamber head and is used to provide a fluorescent image of the fuel distribution in the injection holes. The background plate is used to provide a background image as a comparison reference with the fluorescence image.

6. A test device for combustion chamber head fuel injection performance according to claim 5, characterized in that, The test plate is distributed with several fuel collection heads, which are matched with the layout of the injection holes; The bottom of the test board serves as a support surface and is connected to the lifting platform.

7. The apparatus of claim 4, wherein, The fuel collection tank has several collection holes on its top for collecting fuel injection residue.

8. A method for testing the fuel injection performance of a combustion chamber head, implemented using the testing apparatus for the fuel injection performance of a combustion chamber head as described in any one of claims 1 to 3, characterized in that, The fuel injection performance test plate of the test device includes a fuel collection plate; The testing method includes the following steps: Turn on the lights of the lighting equipment, adjust the lighting parameters, and use the image acquisition equipment to perform background imaging on the fuel collection plate to obtain a background image; Turn off the lights, move the combustion chamber head to the test position, and align it with the fuel collection plate to prepare for fuel injection; Start the fuel supply and inject the fuel with fluorescent components into the fuel collection plate through the fuel injection hole; After fuel injection is completed, remove the combustion chamber head; Turn on the lights of the illumination device, acquire the fluorescent image of the fuel collection plate through the image acquisition device, and record the fuel distribution after injection; Imaging analysis of fluorescence images on the fuel collection plate; The combustion chamber head injection performance was obtained based on the analysis results.

9. A method of testing combustion chamber head fuel injection performance according to claim 8, characterised in that, The step of performing imaging analysis on the fluorescence image of the fuel collection plate and obtaining the combustion chamber head injection performance based on the analysis results further includes: The fluorescence image was compared with the background image to analyze the size of the fluorescence region and the light intensity distribution at each location; Extract information on the fuel distribution area and fuel concentration at each location injected into the combustion chamber head; Evaluate the fuel injection characteristics of the combustion chamber head to determine whether they meet design requirements.

10. A method of testing the fuel injection performance of each injection hole in a combustion chamber head, using the testing device for the fuel injection performance of a combustion chamber head according to any one of claims 4 to 7, characterized by, The fuel injection performance test panel of the test device includes a test panel and a background panel; The testing method includes the following steps: Install the test board and move the combustion chamber head to the test position; Adjust and record the relative position of the test plate and the combustion chamber head as the calibration position, and then remove the combustion chamber head; Place the background board on the test board and adjust the background board to the calibration position; Turn on the lights of the lighting equipment, and use the image acquisition device to image the background of the background panel to obtain the background image; Turn off the lights and move the backdrop away; Move the combustion chamber head back to the test position and adjust the test plate position to align the test plate with the head injection hole; Start the fuel supply and inject the fuel with fluorescent components into the test plate through the fuel injection port. After completion, remove the combustion chamber head. Adjust the height of the test board and reposition the background board; Turn on the lights of the illumination device, acquire the fluorescence image on the test board through the image acquisition device, and record the spraying results; Imaging analysis was performed on the fluorescence images on the test plate; The injection performance of each injection hole in the combustion chamber head was obtained based on the analysis results.

11. The method of testing the fuel injection performance of each injection hole in the combustion chamber head of claim 10, wherein The step of performing imaging analysis on the fluorescence image on the test plate and obtaining the injection performance of each injection orifice in the combustion chamber head based on the analysis results further includes: The fluorescence images of the test plate were analyzed to extract the fluorescence regions and fluorescence intensities. By comparing the design parameters of the injection orifice with the background image, the actual injection flow rate and distribution characteristics of the injection orifice can be obtained.

12. The method of testing the fuel injection performance of each injection hole in the combustion chamber head of claim 11, wherein The step of performing imaging analysis on the fluorescence image on the test plate and obtaining the injection performance of each injection orifice in the combustion chamber head based on the analysis results further includes: By determining the location of the fluorescent area, we can identify the difference between the actual opening position and direction of the injection hole and the design parameters. The difference between the actual opening size of the injection hole and the design parameters is determined by the fluorescence intensity.

Images