A fuel atomization performance testing device

Abstract

The present invention provides a fuel atomization performance test device, in which a fuel spray unit is used to spray a fuel to be tested to form a first atomization field and a second atomization field; a first atomization parameter acquisition unit includes a first atomization field image acquisition subunit and a first atomization parameter test subunit, the first atomization field image acquisition subunit is used to acquire a first atomization field image corresponding to when light passes through the first atomization field, and the first atomization field image includes a shadow image corresponding to a first form of fuel; the first atomization parameter test subunit is used to perform image processing and data processing based on the first atomization field image to obtain a first atomization parameter; the second atomization parameter acquisition unit is used to detect a second form of fuel in a second atomization field to obtain a second atomization parameter of the second form of fuel. By using the device, accurate measurement of the fuel atomization effect can be achieved when the fuel atomization field changes rapidly.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel performance testing, and in particular relates to a fuel atomization performance testing device. Background Art

[0002] In the engine combustion chamber, the atomization quality of the fuel determines its combustion efficiency, flame temperature distribution, emission indicators, etc., which directly affects the engine's safety, performance and emission requirements. Taking aviation alternative fuels as an example, the "ready-to-use" of aviation alternative fuels needs to not change the structure and operating performance of the aircraft engine while not reducing the safety, performance and emission requirements of the alternative fuels. How to certify the "ready-to-use" atomization performance of aviation alternative fuels requires accurate evaluation of their atomization performance.

[0003] The atomization process of aviation fuel forms a huge number of atomized droplets. Not only is the injection speed high and the particle size distribution wide, but the size and speed of the droplets will further change under the effects of evaporation, collision, adhesion, etc. How to achieve accurate measurement of the fuel atomization effect when the fuel atomization field changes rapidly is a problem that needs to be solved. Summary of the invention

[0004] The invention provides a fuel atomization performance testing device to solve the problem of realizing accurate measurement of fuel atomization effect when the fuel atomization field changes rapidly.

[0005] In order to solve or improve the above technical problems to a certain extent, according to one aspect of the present invention, a fuel atomization performance testing device is provided, comprising: a fuel spray unit, a first atomization parameter acquisition unit corresponding to primary atomization, and a second atomization parameter acquisition unit corresponding to secondary atomization;

[0006] The fuel spray unit is used to spray the fuel to be tested to form a first atomization field and a second atomization field, wherein the second atomization field is composed of a second-form fuel, and the second-form fuel is formed by fragmenting the first-form fuel of the first atomization field;

[0007] The first atomization parameter acquisition unit includes a first atomization field image acquisition subunit and a first atomization parameter testing subunit. The first atomization field image acquisition subunit is used to acquire a first atomization field image corresponding to when light passes through the first atomization field, and the first atomization field image includes a shadow image corresponding to the first form of fuel. The first atomization parameter testing subunit is used to perform image processing and data processing based on the first atomization field image to obtain a first atomization parameter.

[0008] The second atomization parameter acquisition unit is used to detect the second form fuel in the second atomization field to acquire second atomization parameters of the second form fuel.

[0009] In some embodiments, the first atomization field image acquisition subunit includes a light source for illuminating the first atomization field, a concave reflector, and an image capturing device, the atomization field is arranged between the concave reflector and the image capturing device, the light source is used to illuminate the first atomization field to form reflected light that is reflected by the concave reflector to the image capturing device, and the image capturing device is used to capture the reflected light to form the first atomization field image including a shadow image corresponding to the first form of fuel.

[0010] In some embodiments, performing image processing and data processing based on the first atomization field image to obtain a first atomization parameter includes:

[0011] Performing image extraction on the first atomization field image to obtain a target image for identifying atomization cone angle;

[0012] Converting the target image into a grayscale image;

[0013] Data processing is performed based on the grayscale image to obtain at least one of a target value of the atomization cone angle, a target length of the atomized liquid film, and a target thickness of the atomized liquid film.

[0014] In some embodiments, extracting the first atomization field image includes:

[0015] A rectangular image with the nozzle axis of the nozzle of the fuel spray unit as the center line in the first atomization field image is extracted as a target image for identifying the atomization cone angle.

[0016] In some embodiments, performing data processing based on the grayscale image to obtain a target value of the atomization cone angle includes:

[0017] Selecting the median of the grayscale values ​​in the grayscale image as a threshold for identifying the atomization cone angle;

[0018] Taking grayscale values ​​in the horizontal direction at different heights in the grayscale image, determining the pixel points whose grayscale values ​​exceed the threshold value among the pixel points at each height as boundary pixel points, recording the left boundary pixel points and the right boundary pixel points corresponding to each height, and obtaining the position information corresponding to the left boundary pixel points and the position information corresponding to the right boundary pixel points;

[0019] Performing linear fitting based on the position information corresponding to the left boundary pixel point to obtain the slope of the left boundary of the atomization cone angle, and performing linear fitting based on the position information corresponding to the right boundary pixel point to obtain the slope of the right boundary of the atomization cone angle;

[0020] Obtaining a value of a fog cone angle corresponding to the grayscale image according to the slope of the left boundary and the slope of the right boundary;

[0021] An average value of the atomization cone angles corresponding to the plurality of grayscale images is calculated, and the average value is determined as a target value of the atomization cone angle.

[0022] In some embodiments, the data processing based on the grayscale image to obtain the target length and the target thickness of the atomized liquid film includes:

[0023] Determine the gray value step threshold;

[0024] Taking the grayscale values ​​of each pixel from left to right and from bottom to top in the grayscale image, and determining the abscissa and ordinate of the pixel whose grayscale value step exceeds the grayscale value step threshold as the pixel value of the length and the pixel value of the thickness of the atomized liquid film corresponding to the grayscale image, respectively;

[0025] Based on a preset target object, the pixel value of the length and the pixel value of the thickness of the atomized liquid film are converted into the length and thickness of the atomized liquid film corresponding to the grayscale image;

[0026] The lengths and thicknesses of the atomized liquid films corresponding to the plurality of grayscale images are averaged, and the averages are determined as the target length and target thickness of the atomized liquid film.

[0027] In some embodiments, the target object is a spherical object with a preset diameter suspended beside the nozzle of the fuel spray unit, and the center of the spherical object and the nozzle axis of the nozzle are in the same normal plane of the optical path.

[0028] In some embodiments, the spray is a centrifugal nozzle.

[0029] In some embodiments, the device further comprises: a test environment maintaining unit, which is used to adjust the external environment of the fuel combustion performance testing device to maintain it in a preset test state before testing the combustion performance of the fuel to be tested.

[0030] In some embodiments, the detecting the second form of the fuel in the second atomization field includes: detecting the second form of the fuel in the second atomization field using a laser Doppler testing method.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The fuel atomization performance testing device provided by the present invention comprises: a fuel spray unit, a first atomization parameter acquisition unit corresponding to primary atomization, and a second atomization parameter acquisition unit corresponding to secondary atomization; the fuel spray unit is used to spray the fuel to be tested to form a first atomization field and a second atomization field, wherein the second atomization field is composed of a second form of fuel, and the second form of fuel is formed by fragmenting the first form of fuel in the first atomization field; the first atomization parameter acquisition unit comprises a first atomization field image acquisition subunit and a first atomization parameter testing subunit, the first atomization field image acquisition subunit is used to acquire a first atomization field image corresponding to when light passes through the first atomization field, and the first atomization field image includes a shadow image corresponding to the first form of fuel; the first atomization parameter testing subunit is used to perform image processing and data processing based on the first atomization field image to obtain a first atomization parameter; the second atomization parameter acquisition unit is used to detect the second form of fuel in the second atomization field to acquire a second atomization parameter of the second form of fuel. Since the shadow image in the first atomization field image can carry the atomization performance information of the fuel to be tested, and the device can efficiently batch process the first atomization field image through image processing, and thus can meet the atomization parameter measurement requirements when the fuel atomization field changes rapidly, by using this device, accurate measurement of the fuel atomization effect can be achieved when the fuel atomization field changes rapidly.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a scenario for obtaining a first atomization parameter using a fuel atomization performance testing device provided in an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of a scenario of obtaining a second atomization parameter using a fuel atomization performance testing device provided in an embodiment of the present application;

[0036] Figure annotation:

[0037] Fuel spray unit 10, first atomization parameter acquisition unit 11 corresponding to primary atomization, second atomization parameter acquisition unit 12 corresponding to secondary atomization, first atomization field image acquisition subunit 111, first atomization parameter test subunit 112, light source 1111, concave reflector 1112, image capture device 1113, preset target 1114 DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method and effects of the user identity authentication method proposed in the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0039] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0040] In view of the fuel atomization performance test scenario, in order to achieve accurate measurement of the fuel atomization effect when the fuel atomization field changes rapidly, the present application provides a fuel atomization performance test device. The following provides an embodiment to describe the device in detail.

[0041] An embodiment of the present application provides a fuel atomization performance testing device. Figure 1 The schematic diagram of the fuel atomization performance test device provided in this embodiment is as follows: Figure 1 The device provided in this embodiment is described in detail. The embodiments described below are used to explain the principle of the method and are not intended to be limiting for actual use.

[0042] like Figure 1 As shown, the fuel atomization performance testing device provided in this embodiment includes: a fuel spray unit 10, a first atomization parameter acquisition unit 11 corresponding to primary atomization, and a second atomization parameter acquisition unit 12 corresponding to secondary atomization.

[0043] The fuel spray unit 10 is used to spray the fuel to be tested to form a first atomization field and a second atomization field, wherein the second atomization field is composed of a second form of fuel, and the second form of fuel is formed by the first form of fuel in the first atomization field after being broken. Fuel atomization is a process in which the fuel flows from the atomizing nozzle at a high speed into the ambient gas and is broken into discrete droplets. This process not only includes the jet breakup process (also called primary atomization), but also the broken droplets will continue to split to form fine atomized droplets (also called secondary atomization). The atomization performance of the fuel is determined by these two processes. That is, during the above-mentioned primary atomization process, the fuel forms a liquid film and an atomization cone angle at its nozzle through the atomizing nozzle (if the atomization cone angle is reduced, the length of the liquid film becomes longer, which will lead to a decrease in the combustion efficiency of the fuel). The liquid film and the atomization cone angle are broken and broken into liquid filaments, liquid sheets or large droplets under the action of aerodynamic force, and then the liquid filaments, liquid sheets or large droplets formed by the above-mentioned primary atomization are further broken into fine atomized droplets through secondary atomization. In this embodiment, the first atomization parameter refers to the atomization cone angle, atomization liquid film length, and atomization liquid film thickness in the primary atomization, and the second atomization parameter refers to the speed and diameter of the fine atomized droplets in the secondary atomization. The first form of fuel is the liquid film, atomization cone angle, liquid filament, liquid sheet, or large droplet, and the second form of fuel is the fine atomized droplet.

[0044] The first atomization parameter acquisition unit 11 includes a first atomization field image acquisition subunit 111 and a first atomization parameter testing subunit 112. The first atomization field image acquisition subunit 111 is used to obtain a first atomization field image corresponding to when light passes through a first atomization field, and the first atomization field image includes a shadow image corresponding to a first form of fuel; the first atomization parameter testing subunit 112 is used to perform image processing and data processing based on the first atomization field image to obtain first atomization parameters, such as obtaining parameter values ​​such as an atomization cone angle, an atomization liquid film length, and an atomization liquid film thickness in a single atomization.

[0045] The second atomization parameter acquisition unit 12 is used to detect the second form fuel of the second atomization field, and obtain the second atomization parameter of the second form fuel, such as measuring the velocity, diameter and other parameters of the fine atomized droplets in the secondary atomization. In this embodiment, the laser Doppler test method can be used to detect the second form fuel of the second atomization field. For example, a phase Doppler dynamic particle analyzer (PDA) is used to measure the droplet size and three-dimensional velocity field of the liquid spray. According to the pre-designed grid distribution, the velocity field, particle size size and flow field information of each atomized droplet particle are measured. For example, the laser is irradiated to the atomized droplet particles, and the detector receives scattered light of three color beams such as green light, blue light and purple light. The particle velocity is calculated by the frequency difference, the droplet diameter is calculated by the phase difference, and the concentration is calculated by the number of particles and the droplet diameter. Specifically, the laser emitted by the laser generator is divided into two parallel incident lasers by a beam splitter, which intersect at the focus of the lens after passing through a convex lens to form a measurement point. When the atomized droplet passes through the measurement point, the interference fringes at the measurement point change due to light scattering. The detector measures the frequency of change of the interference fringes per unit time, calculates the droplet velocity, and calculates the diameter of the atomized droplet at the measuring point based on the peak values ​​at the maximum and minimum amplitudes of the Doppler signal wave measured by the detector. In this embodiment, in order to obtain a sufficient number of samples to reduce the measurement error, no less than a predetermined number of valid samples are collected at each measuring point, and the measured data are calculated and processed to obtain the characteristics of the particle size, droplet velocity, concentration, etc. distributed along the space when different fuels are atomized.

[0046] In this embodiment, the first atomization field image acquisition subunit 111 includes a light source 1111 for irradiating the first atomization field, a concave reflector 1112, and an image pickup device 1113. The atomization field is arranged between the concave reflector and the image pickup device. The light source is used to irradiate the first atomization field and form a reflected light reflected by the concave reflector to the image pickup device. The image pickup device is used to capture the reflected light to form a first atomization field image including a shadow image corresponding to the first form of fuel. For example, the light source can be an LED point light source with a luminous flux greater than 1000LM, the concave reflector can have a diameter of 203mm, the focal length can be 800mm, and the image pickup device can be a camera. Since the light will be reflected and refracted when passing through the atomized liquid film and droplets, the image obtained by focusing the light will appear a shadow at the corresponding position of the atomized liquid film and droplets. Therefore, the shadow image in the captured first atomization field image can carry the atomization performance information of the fuel to be tested.

[0047] In this embodiment, the first atomization parameter testing subunit performs image processing and data processing based on the first atomization field image to obtain the first atomization parameter, which may specifically refer to:

[0048] First, image extraction is performed on the first atomization field image to obtain a target image for identifying the atomization cone angle; in the present embodiment, the process specifically refers to extracting a rectangular image with the nozzle center axis of the nozzle of the fuel spray unit as the center line in the first atomization field image as the target image for identifying the atomization cone angle.

[0049] Secondly, the target image is converted into a grayscale image, for example, the target image is enlarged and then converted into a grayscale image.

[0050] Then, data processing is performed based on the grayscale image to obtain at least one of a target value of the atomization cone angle, a target length of the atomized liquid film, and a target thickness of the atomized liquid film.

[0051] In this embodiment, the data processing based on the grayscale image is performed to obtain the target value of the atomization cone angle, which specifically refers to:

[0052] First, the median of the grayscale value in the grayscale image is selected as the threshold for identifying the fog cone angle;

[0053] Secondly, grayscale values ​​are taken in the horizontal direction at different heights in the grayscale image. Since there is an obvious step at the edge of the atomized liquid film, that is, there is an obvious difference between the grayscale value of the liquid film area and the grayscale value of the air area, the pixel points at the edge of the liquid film whose grayscale values ​​exceed the above threshold among the pixels at each height are determined as boundary pixels, and the left boundary pixel points and the right boundary pixel points corresponding to each height are recorded, and the position information corresponding to the left boundary pixel points and the position information corresponding to the right boundary pixel points are obtained;

[0054] Then, linear fitting is performed based on the position information corresponding to the left boundary pixel point to obtain the slope of the left boundary of the atomization cone angle, and linear fitting is performed based on the position information corresponding to the right boundary pixel point to obtain the slope of the right boundary of the atomization cone angle;

[0055] Thirdly, according to the slope of the left boundary, the slope of the right boundary, and the geometric relationship between the slope and the angle, the value of the atomization cone angle corresponding to the grayscale image is calculated;

[0056] Finally, the values ​​of the fog cone angles corresponding to the above-mentioned grayscale images are averaged, and the average value is determined as the target value of the above-mentioned fog cone angle. For example, multiple first fog field images can be captured by an image capture device, and the Pillow image processing module in Python is used to batch process the multiple first fog field images, and the above-mentioned grayscale image is extracted from each first fog field image. After processing each grayscale image in the above manner, multiple fog cone angle values ​​corresponding to each grayscale image are obtained, and the average value of the multiple fog cone angle values ​​is calculated, and the average value is used as the target value of the fog cone angle.

[0057] In this embodiment, the data processing based on the grayscale image is performed to obtain the target length and the target thickness of the atomized liquid film, which may specifically refer to:

[0058] First, a gray value step threshold is determined. In this embodiment, the median of the gray values ​​in the gray image is selected as the gray value step threshold.

[0059] Secondly, the grayscale values ​​of each pixel point are taken from left to right and from bottom to top in the grayscale image, and the horizontal and vertical coordinates of the pixel points whose grayscale values ​​exceed the grayscale value step threshold are respectively determined as the pixel values ​​of the length and thickness of the atomized liquid film corresponding to the grayscale image. Then, based on the preset target, the pixel values ​​of the length and thickness of the atomized liquid film are converted into the length and thickness of the atomized liquid film corresponding to the grayscale image; in this embodiment, Figure 1 The preset target 1114 is a spherical object with a preset diameter suspended beside the nozzle of the fuel spray unit. The center of the spherical object and the nozzle axis of the nozzle are in the same normal plane of the light path (irradiated light), so that the rate of change of the image enlargement or reduction is consistent. Through this setting, after obtaining the pixel value of the length and the pixel value of the thickness of the atomized liquid film, the pixel value of the spherical object suspended beside the nozzle can be calculated in proportion to the pixel value of the spherical object suspended beside the nozzle to obtain the real length and thickness of the atomized liquid film.

[0060] Finally, the length and thickness of the atomized liquid film corresponding to the multiple grayscale images are averaged, and the average is determined as the target length and target thickness of the atomized liquid film. Similar to the above method of calculating the target value of the atomization cone angle, multiple first atomized field images can be captured by an image capture device, and the Pillow image processing module in Python can be used to batch process the multiple first atomized field images, and the above grayscale image is extracted from each first atomized field image. After processing each grayscale image in the above manner, the length and thickness of multiple atomized liquid films corresponding to each grayscale image are obtained, and the average of the lengths and thicknesses of the multiple atomized liquid films is respectively calculated, and the average is used as the target length and target thickness of the atomized liquid film.

[0061] In this embodiment, the nozzle of the above-mentioned fuel spray unit is a centrifugal nozzle. The centrifugal nozzle has a simple structure and reliable operation. It has the ability to atomize the fuel in the ambient atmosphere. It can eliminate the interference of the ambient gas flow on the fuel atomization process during the atomization process, which is conducive to reflecting the influence of different fuel properties on the atomization performance.

[0062] In this embodiment, the above-mentioned fuel atomization performance testing device also includes a test environment maintaining unit, which is used to adjust the internal environment of the fuel atomization performance testing device to maintain a standard state (i.e., standard atmospheric conditions) before testing the atomization performance of the fuel to be tested, and maintain the air temperature, humidity, density, and flow state unchanged, so as to eliminate the influence of the environment on the fuel atomization performance.

[0063] The fuel atomization performance testing device provided in this embodiment includes: a fuel spray unit, a first atomization parameter acquisition unit corresponding to the first atomization, and a second atomization parameter acquisition unit corresponding to the secondary atomization; the fuel spray unit is used to spray the fuel to be tested to form a first atomization field and a second atomization field, wherein the second atomization field is composed of a second form of fuel, and the second form of fuel is formed by the fragmentation of the first form of fuel in the first atomization field; the first atomization parameter acquisition unit includes a first atomization field image acquisition subunit and a first atomization parameter testing subunit, the first atomization field image acquisition subunit is used to acquire a first atomization field image corresponding to when light passes through the first atomization field, and the first atomization field image includes a shadow image corresponding to the first form of fuel; the first atomization parameter testing subunit is used to perform image processing and data processing based on the first atomization field image to obtain a first atomization parameter; the second atomization parameter acquisition unit is used to detect the second form of fuel in the second atomization field to obtain the second atomization parameter of the second form of fuel. Since the shadow image in the first atomization field image can carry the atomization performance information of the fuel to be tested, and the device can efficiently batch process the first atomization field image by image processing, and thus can meet the atomization parameter measurement requirements when the fuel atomization field changes rapidly, by using the device, the fuel atomization effect can be accurately measured when the fuel atomization field changes rapidly, and the atomization flow field will not be disturbed during the measurement process. After changing the performance of traditional aviation fuel by adding typical alternative components, the use of the above-mentioned fuel atomization performance test device can clearly distinguish the difference in atomization performance between the alternative jet fuel and the traditional petroleum-based jet fuel caused by the performance change. The device can not only meet the "ready-to-use" evaluation process of aviation alternative fuels, but also provide usage countermeasures for the applicability of fuels and engines.

[0064] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fuel atomization performance testing device, characterized in that: It includes: a fuel spray unit, a first atomization parameter acquisition unit corresponding to the primary atomization, and a second atomization parameter acquisition unit corresponding to the secondary atomization; The fuel spray unit is used to spray the fuel to be tested to form a first atomization field and a second atomization field, wherein the second atomization field is composed of a second-form fuel, and the second-form fuel is formed by fragmenting the first-form fuel of the first atomization field; The first atomization parameter acquisition unit includes a first atomization field image acquisition subunit and a first atomization parameter test subunit. The first atomization field image acquisition subunit is used to acquire a first atomization field image corresponding to when light passes through the first atomization field, and the first atomization field image includes a shadow image corresponding to the first form of fuel; the first atomization parameter test subunit is used to perform image processing and data processing based on the first atomization field image to obtain a first atomization parameter, including: performing image extraction on the first atomization field image to obtain a target image for identifying an atomization cone angle; converting the target image into a grayscale image; performing data processing based on the grayscale image to obtain a target value of the atomization cone angle, a target length of the atomized liquid film, and a target thickness of the atomized liquid film; The second atomization parameter acquisition unit is used to detect the second form fuel in the second atomization field to acquire second atomization parameters of the second form fuel, where the second atomization parameters are speed and diameter of the second form fuel; The step of performing data processing based on the grayscale image to obtain a target length and a target thickness of the atomized liquid film includes: Determine the gray value step threshold; Taking the grayscale values ​​of each pixel from left to right and from bottom to top in the grayscale image, and determining the abscissa and ordinate of the pixel whose grayscale value step exceeds the grayscale value step threshold as the pixel value of the length and the pixel value of the thickness of the atomized liquid film corresponding to the grayscale image, respectively; Based on a preset target object, the pixel value of the length and the pixel value of the thickness of the atomized liquid film are converted into the length and thickness of the atomized liquid film corresponding to the grayscale image; The lengths and thicknesses of the atomized liquid films corresponding to the plurality of grayscale images are averaged, and the averages are determined as the target length and target thickness of the atomized liquid film.

2. The device according to claim 1, characterized in that The first atomization field image acquisition subunit includes a light source for irradiating the first atomization field, a concave reflector, and an image capturing device. The atomization field is arranged between the concave reflector and the image capturing device. The light source is used to irradiate the first atomization field to form reflected light that is reflected by the concave reflector to the image capturing device. The image capturing device is used to capture the reflected light to form the first atomization field image including a shadow image corresponding to the first form of fuel.

3. The device according to claim 1, characterized in that The extracting the first atomization field image includes: A rectangular image with the nozzle axis of the nozzle of the fuel spray unit as the center line in the first atomization field image is extracted as a target image for identifying the atomization cone angle.

4. The device according to claim 1, characterized in that The performing data processing based on the grayscale image to obtain a target value of the atomization cone angle includes: Selecting the median of the grayscale values ​​in the grayscale image as a threshold for identifying the atomization cone angle; Taking grayscale values ​​in the horizontal direction at different heights in the grayscale image, determining the pixel points whose grayscale values ​​exceed the threshold value among the pixel points at each height as boundary pixel points, recording the left boundary pixel points and the right boundary pixel points corresponding to each height, and obtaining the position information corresponding to the left boundary pixel points and the position information corresponding to the right boundary pixel points; Performing linear fitting based on the position information corresponding to the left boundary pixel point to obtain the slope of the left boundary of the atomization cone angle, and performing linear fitting based on the position information corresponding to the right boundary pixel point to obtain the slope of the right boundary of the atomization cone angle; Obtaining a value of a fog cone angle corresponding to the grayscale image according to the slope of the left boundary and the slope of the right boundary; An average value of the atomization cone angles corresponding to the plurality of grayscale images is calculated, and the average value is determined as a target value of the atomization cone angle.

5. The device according to claim 1, characterized in that The target object is a spherical object with a preset diameter suspended beside the nozzle of the fuel spray unit, and the center of the spherical object and the nozzle axis of the nozzle are in the same normal plane of the optical path.

6. The device according to claim 3 or 5, characterized in that The nozzle is a centrifugal nozzle.

7. The device according to claim 1, characterized in that The device further comprises: a test environment maintaining unit, which is used to adjust the internal environment of the fuel atomization performance testing device to maintain it in a preset test state before testing the atomization performance of the fuel to be tested.

8. The device according to claim 1, characterized in that The detecting the second-form fuel in the second atomization field includes: The second form of fuel in the second atomization field is detected using a laser Doppler testing method.

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