A mutual impact nozzle atomization multi-parameter synchronous measurement device and method

Abstract

The application provides a kind of mutual impact nozzle atomization multi-parameter synchronous measurement device and method, with such characteristics, including: mutual impact nozzle, for generating multiple jet capable of mutual impact atomization, the region of multiple jet mutual impact atomization forms atomization field;Optical imaging measurement system for providing light, and the image acquisition of jet and atomization field;Control system for controlling the working mode of mutual impact nozzle and optical imaging measurement system and the opening and closing of mutual impact nozzle and optical imaging measurement system;Data analysis system for processing the image of jet and atomization field collected by optical imaging measurement system, to obtain atomization parameter.

Description

Technical Field

[0001] This invention relates to the field of multiphase flow measurement technology, specifically to a device and method for synchronous measurement of multiple parameters using a mutual-impact nozzle atomization. Background Technology

[0002] Impact nozzles atomize liquids by colliding two or more liquid jets, offering advantages such as rapid atomization, fine particle size, and high atomization uniformity. The impact nozzle ejects liquid jets from two or more different channels or orifices, causing them to collide within a certain area outside the nozzle, thus breaking the liquid into small droplets. Impact nozzles are commonly used for liquid fuel atomization. Atomizing liquid fuel through an impact nozzle increases the contact area between the fuel and air, enhancing fuel evaporation and mixing, resulting in more complete combustion, which helps improve fuel combustion efficiency and reduce pollutant emissions.

[0003] Measuring atomization parameters is a crucial method for evaluating nozzle atomization performance. Existing methods for measuring nozzle atomization parameters include optical imaging, laser Doppler velocimetry (LDV), phase Doppler particle analyzer (PDPA), particle image velocimetry (PIV), particle tracking velocimetry (PTV), and laser scattering measurement methods. These methods typically target single atomization parameters, such as atomization angle, droplet size, and velocity. Other methods utilize multi-algorithm fusion or combinations of multiple measurement systems to achieve multi-parameter atomization measurement.

[0004] Current measurements of atomization parameters in impact nozzles mainly focus on parameters related to the atomization field, employing a relatively singular measurement method and paying less attention to parameters related to the jet itself. In practical applications, existing nozzle atomization parameter measurement methods are insufficient for a comprehensive evaluation of atomization parameters, failing to meet the measurement needs of real-world applications. Summary of the Invention

[0005] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a device and method for synchronous measurement of multiple parameters of atomization by mutual impact nozzle.

[0006] A multi-parameter synchronous measurement device for atomization using an impact-type nozzle is characterized by comprising: an impact-type nozzle for generating multiple jets capable of impact-atomization, wherein the area where the multiple jets impact-atomize forms an atomization field; an optical imaging measurement system for providing illumination and acquiring images of the jets and the atomization field; a control system for controlling the operating modes of the impact-type nozzle and the optical imaging measurement system, as well as the opening and closing of the impact-type nozzle and the optical imaging measurement system; and a data analysis system for processing the images of the jets and the atomization field acquired by the optical imaging measurement system to obtain atomization parameters.

[0007] The multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle provided by the present invention may also have the following features:

[0008] The mutual-impact nozzle includes: multiple nozzle bodies arranged in parallel, each nozzle body having a jet hole, the jet holes of the multiple nozzle bodies facing the same point; a liquid supply device connected to each nozzle body, the liquid supply device being used to deliver liquid to the nozzle body, the liquid supply device being either a squeeze type or a pump type; and a fixed bracket located on both sides of each nozzle body, used to provide support for the nozzle body, one end of the fixed bracket being connected to the nozzle body and the other end being connected to the liquid supply device.

[0009] The multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle provided by the present invention may also have the following feature: the liquid supply device is provided with multiple valves, which are arranged in a one-to-one correspondence with the nozzle body, and the valves are used to control the input of liquid into the nozzle body.

[0010] The multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle provided by the present invention may also have the following features: wherein the optical imaging measurement system includes: multiple light sources, uniformly distributed around the atomization field, the light emitted by the multiple light sources all facing the atomization field and intersecting at the center of the atomization field; multiple image sensors, arranged in a one-to-one correspondence with the light sources; multiple optical lenses, arranged in a one-to-one correspondence with the image sensors, used to adjust the imaging focal plane and imaging area of ​​the image sensors; and a data acquisition system electrically connected to each image sensor.

[0011] The multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle provided by the present invention may also have the following features:

[0012] The control system includes: a liquid supply switch for the mutual-impact nozzle channel, electrically connected to each valve to control the opening and closing of the valves; a light source controller, electrically connected to each light source to control the opening and closing of the light source; an image sensor controller, electrically connected to each image sensor to control the opening and closing of the image sensor; and an integrated control unit, electrically connected to the data acquisition system, the liquid supply switch for the mutual-impact nozzle channel, the light source controller, and the image sensor controller, to issue commands to control the opening and closing of the liquid supply switch for the mutual-impact nozzle channel, the light source controller, and the image sensor controller according to different working modes.

[0013] The multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle provided by the present invention may also have the following features:

[0014] The mutual impact nozzle atomization multi-parameter synchronous measurement device has two working modes: jet measurement mode and fog field measurement mode.

[0015] In the jet measurement mode, the operation of the multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle is as follows: The control system sends a jet measurement mode command to the liquid supply switch of the mutual-impact nozzle channel, the light source controller, and the image sensor controller. The liquid supply switch of the mutual-impact nozzle channel controls the two independent channels to work one by one to generate jets. The light source is adjusted by the light source controller and the image sensor controller, taking into account factors such as high brightness, uniformity, and directionality of the illumination. At the same time, backlighting or sidelighting is used to generate high-contrast contours. Through multi-view vision contour 3D imaging technology, the two jets are imaged one by one. Based on the multi-view 3D contour imaging image processing algorithm, the 3D spatial volume of the two jets is analyzed one by one, and the intersection of the two jet spatial volumes is obtained, thereby evaluating the alignment of the two jets.

[0016] In the fog field measurement mode, the operation of the multi-parameter synchronous measurement device for the mutual-impact nozzle atomization is as follows: The control system sends a jet measurement mode command to the liquid supply switch of the mutual-impact nozzle channel, the light source controller, and the image sensor controller. The liquid supply switch of the mutual-impact nozzle channel controls the two independent channels to work simultaneously to generate jets and form a fog field. The control system sends commands to the light source controller and the image sensor controller, which capture the geometry of the spray from different perspectives using multiple cameras. Using multi-view vision contour 3D imaging technology, the 3D boundary of the spray is reconstructed based on the multi-view 3D contour imaging image processing algorithm to determine the fog angle. The light source controller provides good illumination and backlighting, and then performs image segmentation, recognition, and processing. The droplet size is obtained based on the PTV image processing algorithm, and the droplet size distribution, droplet concentration, and distribution are statistically obtained. Multiple cameras are controlled to capture the 3D motion trajectory of the droplets, obtain the 3D motion velocity of the droplets, and statistically obtain the 3D motion velocity distribution of the droplets. At the same time, the velocity distribution of the fog field is obtained based on the PIV image processing algorithm, and multiple cameras are controlled to capture 3D images of the fog field to obtain the 3D velocity distribution of the fog field. At the same time, the light source is controlled to provide parallel light and synchronized with the high-speed camera to obtain multi-angle extinction images of the atomized field. Through a three-dimensional extinction tomography imaging algorithm, a three-dimensional tomography of the extinction value of the atomized field is obtained, thereby analyzing the uniformity of the atomized field.

[0017] This invention also provides a method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle, characterized by: using a mutual-impact nozzle to generate multiple jets capable of mutual atomization, wherein the area of ​​mutual atomization of the multiple jets forms an atomization field; using an optical imaging measurement system to provide illumination and acquire images of the jets and the atomization field; using a control system to control the working mode of the mutual-impact nozzle and the optical imaging measurement system, as well as the opening and closing of the optical imaging measurement system; and using a data analysis system to process the images of the jets and the atomization field acquired by the optical imaging measurement system to obtain atomization parameters.

[0018] The mutual-impact nozzle atomization multi-parameter synchronous measurement device has two working modes: jet measurement mode and fog field measurement mode.

[0019] In the jet measurement mode, the operation of the multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle is as follows: The control system sends a jet measurement mode command to the liquid supply switch of the mutual-impact nozzle channel, the light source controller, and the image sensor controller. The liquid supply switch of the mutual-impact nozzle channel controls the two independent channels to work one by one to generate jets. The light source is adjusted by the light source controller and the image sensor controller, taking into account factors such as high brightness, uniformity, and directionality of the illumination. At the same time, backlighting or sidelighting is used to generate high-contrast contours. Through multi-view vision contour 3D imaging technology, the two jets are imaged one by one. Based on the multi-view 3D contour imaging image processing algorithm, the 3D spatial volume of the two jets is analyzed one by one, and the intersection of the two jet spatial volumes is obtained, thereby evaluating the alignment of the two jets.

[0020] In the fog field measurement mode, the operation of the multi-parameter synchronous measurement device for the mutual-impact nozzle atomization is as follows: The control system sends a jet measurement mode command to the liquid supply switch of the mutual-impact nozzle channel, the light source controller, and the image sensor controller. The liquid supply switch of the mutual-impact nozzle channel controls the two independent channels to work simultaneously to generate jets and form a fog field. The control system sends commands to the light source controller and the image sensor controller, which capture the geometry of the spray from different perspectives using multiple cameras. Using multi-view vision contour 3D imaging technology, the 3D boundary of the spray is reconstructed based on the multi-view 3D contour imaging image processing algorithm to determine the fog angle. The light source controller provides good illumination and backlighting, and then performs image segmentation, recognition, and processing. The droplet size is obtained based on the PTV image processing algorithm, and the droplet size distribution, droplet concentration, and distribution are statistically obtained. Multiple cameras are controlled to capture the 3D motion trajectory of the droplets, obtain the 3D motion velocity of the droplets, and statistically obtain the 3D motion velocity distribution of the droplets. At the same time, the velocity distribution of the fog field is obtained based on the PIV image processing algorithm, and multiple cameras are controlled to capture 3D images of the fog field to obtain the 3D velocity distribution of the fog field. At the same time, the light source is controlled to provide parallel light and synchronized with the high-speed camera to obtain multi-angle extinction images of the atomized field. Through a three-dimensional extinction tomography imaging algorithm, a three-dimensional tomography of the extinction value of the atomized field is obtained, thereby analyzing the uniformity of the atomized field.

[0021] The synchronous measurement method for multiple parameters of atomization in a jet-impact nozzle provided by this invention may also have the following features: the atomization parameters include one or more of the following: jet impact alignment, atomization angle of the atomization field, droplet size, droplet velocity, three-dimensional velocity distribution of the atomization field, atomization uniformity, and atomization concentration. The method for measuring jet impact alignment is as follows: images of multiple jets are acquired using an optical imaging measurement system, and then the images of the multiple jets are processed by a data analysis system to obtain the jet impact alignment parameters.

[0022] The neutrality parameter of the jet impact pair is calculated using the following formula:

[0023] Projection matrix P i In the coordinate system, point X = [X, Y, Z, 1] T Projected onto the image plane point x i =[x i ,y i ,1] T The following relationship exists:

[0024] s i x i =P i X

[0025]

[0026] s i x i =M i1 X+M i2 Y+M i3 Z+m i1

[0027] s i y i =M i4 X+M i5 Y+M i6 Z+m i2

[0028] s i =M i7 X+M i8 Y+M i9 Z+m i3

[0029] s i Substituting the first two equations, solving the above equation yields AX = 0, where...

[0030]

[0031] Perform singular value decomposition (SVD) on matrix A: A = U∑V T The least squares solution is the right singular variable corresponding to the minimum singular value, which is the last column of V. This column vector represents a three-dimensional point X in homogeneous coordinates.

[0032] After obtaining the three-dimensional coordinates of the entire space, the three-dimensional spatial volume of the multiple jets is analyzed one by one, and the intersection of the multiple jet spatial volumes is obtained to obtain the jet collision centering parameters.

[0033] The method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle provided by this invention may also have the following features:

[0034] The method for determining the atomization angle of the atomization field is as follows:

[0035] The atomization field is imaged from multiple angles using an optical imaging measurement system to capture its geometry. The three-dimensional boundary of the atomization field is reconstructed using a multi-view three-dimensional contour imaging image processing algorithm to determine the atomization angle of the atomization field.

[0036] The methods for measuring droplet size, droplet velocity, and the three-dimensional velocity distribution of the atomized field are as follows:

[0037] An optical imaging measurement system was used to image the atomized field from multiple angles. The obtained atomized field images were then reconstructed in three dimensions. Based on the applicable objects of the Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV) processing algorithms, the atomized field images were processed using the PIV image processing algorithm to obtain the three-dimensional velocity distribution of the atomized field. The droplet images were processed using the PTV image processing algorithm to obtain the droplet size and droplet velocity parameters.

[0038] Based on the PTV image processing algorithm, the droplet size and droplet velocity are calculated using the following formulas to track droplet motion images:

[0039] The droplet size is:

[0040]

[0041] The velocity of the droplet is:

[0042]

[0043] In the formula, a is the pixel size of the image sensor, m is the magnification of the lens, h is the trajectory width, and t represents the exposure time;

[0044] Based on the PIV image processing algorithm to track the droplet motion image in the atomized field, the three-dimensional velocity distribution of the atomized field is calculated using the following formula:

[0045] Cross-correlation analysis of atomized field images:

[0046]

[0047] The velocity distribution of the atomization field can be obtained:

[0048]

[0049] In the formula, r pq(i,j) The value represents the maximum value of the cross-correlation function, and i and j represent the coordinates corresponding to the maximum value of the cross-correlation function.

[0050] The method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle provided by this invention may also have the following features:

[0051] The atomization uniformity and atomization concentration are calculated using the following methods:

[0052] Convert the projected light intensity into extinction projection data p θ (s), where I0(s) is the initial light intensity, I θ (s) represents the transmitted light intensity:

[0053]

[0054] Projection data p for each angle θ (s) performs one-dimensional convolution filtering, where * represents convolution and h(s) is the filtering function:

[0055] p filtered,θ (s)=p θ (s)*h θ (s)

[0056] Then, backprojection reconstruction is performed. The filtered projection data is backprojected and superimposed along the original path to reconstruct the extinction data distribution f(x,y):

[0057]

[0058] For each pixel (x) i ,y j ), calculate its projected position s = x under angle θ. i cosθ+y i sinθ, obtained from p through linear interpolation filtered,θ The corresponding value is obtained from (s) and accumulated into f(x). i ,y j ).

[0059] The atomization uniformity parameter is obtained through the standard deviation σ:

[0060]

[0061] In the formula, σ is the standard deviation and CV is the coefficient of variation;

[0062] Atomization concentration parameter is obtained through average extinction coefficient get:

[0063]

[0064] The concentration n is:

[0065]

[0066] In the formula, Q ext denoted as extinction efficiency factor, and r as particle radius.

[0067] Invention Function and Effect

[0068] According to the present invention, a multi-parameter synchronous measurement device for atomization of a mutual-impact nozzle is used to switch between two working modes of the mutual-impact nozzle and the optical imaging measurement system through a control system. Following the multi-parameter synchronous measurement steps, the atomization field parameters in both the jet measurement mode and the fog field measurement mode are obtained. The atomization field parameters are comprehensively evaluated to meet the needs of atomization performance testing and product verification of the mutual-impact nozzle, and to help to more accurately and comprehensively judge the atomization performance of the mutual-impact nozzle and the overall working performance of the product. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of the structure of the synchronous measurement device for multi-parameter atomization of the mutual-impact nozzle in an embodiment of the present invention;

[0070] Figure 2 This is an operation flowchart of the method for synchronous measurement of multiple parameters of atomization by mutual impact nozzle in an embodiment of the present invention;

[0071] Figure 3 This is a schematic diagram of the jet measurement mode in an embodiment of the present invention;

[0072] Figure 4 This is a flowchart of the three-dimensional contour imaging image processing algorithm in an embodiment of the present invention;

[0073] Figure 5 This is a schematic diagram of the fog field measurement mode in an embodiment of the present invention;

[0074] Figure 6 This is a schematic diagram of the three-dimensional extinction tomography principle in an embodiment of the present invention;

[0075] Figure 7 This is a flowchart of the three-dimensional extinction tomography algorithm in an embodiment of the present invention.

[0076] Explanation of symbols for main components:

[0077] In the figure: 100, Multi-parameter synchronous measurement device for atomization of mutual impact nozzles; 1, Mutual impact nozzle; 11, Nozzle body; 12, Jet orifice; 13, Fixed bracket; 14, Liquid supply device; 110, First jet; 111, Nth jet; 2, Optical imaging measurement system; 21, Light source; 22, Image sensor; 23, Optical lens; 28, Data acquisition system; 3, Control system; 31, Liquid supply switch for mutual impact nozzle channel; 32, Light source controller; 33, Image sensor controller; 34, Integrated control unit; 8, Data analysis system; 81, Computer storage and processing module; 82, Computer control module; 4, Imaging center; 5, Outer contour of atomization field. Detailed Implementation

[0078] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0079] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the present invention's device and method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle.

[0080] Figure 1 This is a schematic diagram of the structure of the synchronous measurement device for multi-parameter atomization of the mutual impact nozzle in an embodiment of the present invention.

[0081] like Figure 1 As shown, the synchronous measurement device 100 for multi-parameter atomization of the mutual-impact nozzle in this embodiment (hereinafter referred to as the synchronous measurement device) includes a mutual-impact nozzle 1, an optical imaging measurement system 2, a control system 3, and a data analysis system 8.

[0082] The impact nozzle 1 is used to generate multiple jets capable of mutual impact atomization. The area where the multiple jets impact and atomize forms an atomization field. The impact nozzle 1 is the basic equipment of the entire synchronous measurement device 100. The impact nozzle 1 includes multiple nozzle bodies 11, a liquid supply device 14, and a fixed support 13.

[0083] The nozzle bodies 11 are arranged in parallel, and each nozzle body 11 is provided with a jet hole 12. The jet holes 12 of multiple nozzle bodies 11 face the same point and guide the jet direction respectively, so that multiple jets converge and collide with each other in the area to be measured and generate atomization, forming an atomization field.

[0084] The liquid supply device 14 is connected to each nozzle body 11 and is used to deliver liquid to the nozzle body 11. The liquid supply device 14 is either a squeeze type or a pump type, and it is equipped with multiple valves inside. Each valve is arranged in a one-to-one correspondence with the nozzle body 11, and the valves are used to control the input of liquid into the nozzle body 11.

[0085] The number of fixed supports 13 corresponds to the number of nozzle bodies 11. Each fixed support 13 is inclined and disposed on both sides of each nozzle body 11 to provide support for the nozzle body 11. One end of the fixed support 13 is connected to the nozzle body 11, and the other end is connected to the liquid supply device 14.

[0086] The optical imaging measurement system 2 is used to provide illumination and acquire images of the jet and the atomization field. The optical imaging measurement system 2 includes multiple light sources 21, multiple image sensors 22, multiple optical lenses 23, and a data acquisition system 28.

[0087] Multiple light sources 21 are evenly distributed around the atomization field, and the light emitted by the multiple light sources 21 is all directed towards the atomization field and intersects at the center of the atomization field. The multiple light sources 21 provide the illumination conditions required for image acquisition of the atomization field.

[0088] Multiple image sensors 22 are arranged in a one-to-one correspondence with the light source 21, located on the side of the light source 21 away from the atomization field.

[0089] Multiple optical lenses 23 are arranged in a one-to-one correspondence with the image sensor 22, located on the side of the light source 21 near the fogging field. The optical lenses 23 adjust the imaging focal plane and imaging area of ​​the image sensor 22 by adjusting lens parameters such as magnification, aperture, and focal length.

[0090] The data acquisition system 28 is multi-channel and electrically connected to each image sensor 22. The data acquisition system 28 is used to acquire and store images of the jet and atomization field obtained by the image sensors 22.

[0091] The control system 3 is used to control the operating modes of the impact nozzle 1 and the optical imaging measurement system 2, as well as their opening and closing. The operating modes include jet measurement mode and fog field measurement mode. The optical imaging measurement system 2 and the control system 3 are the core components of the entire synchronous measurement device 100. The control system 3 includes an impact nozzle channel liquid supply switch 31, a light source controller 32, an image sensor controller 33, and an integrated control unit 34.

[0092] The liquid supply switch 31 of the interlocking nozzle channel is multi-channel and is electrically connected to each valve in the liquid supply device 14. Each channel controls one valve and is used to independently control the opening and closing of the corresponding valve in the liquid supply device 14 to control the jet ejected from each nozzle body 11.

[0093] The light source controller 32 is matched with the light source 21 and is a multi-channel controller. It is electrically connected to each light source 21, and each channel is connected to one light source 21 to control the opening and closing of the corresponding light source 21.

[0094] The image sensor controller 33 is matched with the image sensor 22 and is a multi-channel controller. It is electrically connected to each image sensor 22, and each channel is connected to one image sensor 22 to control the opening and closing of the corresponding image sensor 22.

[0095] The integrated control unit 34 is electrically connected to the data acquisition system 28, the liquid supply switch 31 of the interlocking nozzle channel, the light source controller 32, and the image sensor controller 33. The integrated control unit 34 is used to issue commands to control the opening and closing of the interlocking nozzle channel liquid supply switch 31, the light source controller 32, and the image sensor controller 33 according to different operating modes.

[0096] The data analysis system 8 is used to process the images of the jet and atomization field acquired by the optical imaging measurement system 2 to obtain atomization parameters. The data analysis system 8 is composed of a computer, including a computer storage and processing module 81 and a computer control module 82. The data analysis system 8 is electrically connected to the data acquisition system 28.

[0097] Based on the aforementioned synchronous measurement device 100, this embodiment also provides a corresponding synchronous measurement method for multiple parameters of atomization using a mutual-impact nozzle, the method comprising:

[0098] A mutual-impact nozzle 1 is used to generate multiple jets capable of mutual-impact atomization, and the area where the multiple jets mutually impact and atomize forms an atomization field.

[0099] An optical imaging measurement system 2 is used to provide illumination and to acquire images of the jet and the atomization field;

[0100] The control system 3 is used to control the working mode of the mutual impact nozzle 1 and the optical imaging measurement system 2, as well as the opening and closing of the optical imaging measurement system 2.

[0101] The data analysis system 8 is used to process the images of the jet and atomization field acquired by the optical imaging measurement system 2 to obtain atomization parameters.

[0102] The atomization parameters include one or more of the following: jet impact neutrality, atomization angle of the atomization field, droplet size, droplet velocity, three-dimensional velocity distribution of the atomization field, atomization uniformity, and atomization concentration.

[0103] Figure 2 This is an operation flowchart of the method for synchronous measurement of multiple parameters of atomization by mutual impact nozzle in an embodiment of the present invention.

[0104] like Figure 2 As shown, the specific operation flow of the measurement method in this embodiment includes the following steps:

[0105] Step S1: Install and debug the fixed synchronous measuring device 100.

[0106] Multiple jet holes 12 are adjusted to preset angles, and the light source 21 and optical lens 23 are mounted on the image sensor 22, forming an imaging unit. The data lines of the light source 21 and the image sensor 22 are securely connected between each imaging unit. Multiple imaging units are installed in different directions around the area to be measured to ensure the accuracy of data fusion. Each imaging unit is connected to the light source controller 32 and the image sensor controller 33 via the light source data line and the image sensor 22 data line. The light source controller 32 and the image sensor controller 33 are connected to the integrated control unit 34. The data acquisition system 28 is connected to the image sensor 22, the integrated control unit 34, and the data analysis system 8. When the integrated control unit 34 issues different operating mode commands, the data acquisition system 28 stores and transmits the acquired image information in partitions. One end of the data analysis system 8 is connected to the integrated control unit 34 to issue control commands to the entire system; the other end is connected to the data acquisition system 28 to receive and analyze the image information under the two operating modes.

[0107] Step S2: Select the jet measurement mode, and use the control system 3 to control the mutual impact nozzle 1, optical imaging measurement system 2 and data analysis system 8 to work in the jet measurement mode, and synchronously obtain parameters such as jet mutual impact alignment.

[0108] Figure 3 This is a schematic diagram of the jet measurement mode in an embodiment of the present invention. Figure 4 This is a flowchart of the three-dimensional contour imaging image processing algorithm in an embodiment of the present invention.

[0109] like Figure 3-4 As shown, the method for measuring the jet impact alignment in this embodiment is as follows:

[0110] In the jet measurement mode, the integrated control unit 34 sends a jet measurement mode command to the liquid supply switch 31 of the interlocking nozzle channel, the light source controller 32, and the image sensor controller 33. The liquid supply switch 31 of the interlocking nozzle channel independently controls the opening and closing of multiple valves in the liquid supply device 14 through multiple channels, so that the nozzle body 11 works one by one to generate a jet.

[0111] Specifically, the optical imaging measurement system 2 is used to acquire images of multiple jets. First, the image sensor 22 is turned on to start capturing images of the area to be measured. Then, a nozzle body 11 is activated to spray the first jet 110, and the image sensor 22 captures images of it from various angles. After capturing images, the nozzle body 11 is turned off, and another nozzle body 11 is activated to spray the Nth jet 111, and images are captured in the same way. This process is repeated to complete the imaging task required for the jet measurement mode.

[0112] The light source 21 is controlled by the light source controller 32 and the image sensor controller 33, taking into account factors such as high brightness, uniformity and directionality of the illumination, and simultaneously using backlight or sidelight to produce a high-contrast outline.

[0113] Then, the images of the multiple jets are processed by the data analysis system 8 to obtain the jet impact alignment parameters. Using multi-view vision contour 3D imaging technology, the spatial 3D images of the multiple jets are reconstructed separately, and their overlap at the confluence is analyzed, giving rise to the concept of "impact alignment overlap". After 3D reconstruction, the overlap coordinates and contour coordinates are analyzed and used to determine the impact atomization intensity of the two jets.

[0114] The moderate parameters of the jet impact pair were obtained using a multi-view 3D contour imaging image processing algorithm and calculated according to the following formula:

[0115] Step S4-1, input the projection matrix and pixels, projection matrix P i In the coordinate system, point X = [X, Y, Z, 1] T Projected onto the image plane point x i =[x i ,y i ,1] T ,

[0116] Step S4-2, construct a system of linear equations, with the following relationship:

[0117] s i x i =P i X

[0118]

[0119] s i x i =M i1 X+M i2 Y+M i3 Z+m i1

[0120] s i y i =M i4 X+M i5 Y+M i6 Z+m i2

[0121] s i =M i7 X+M i8 Y+M i9 Z+m i3

[0122] s iSubstituting the first two equations, we can solve the above equation to obtain AX = 0.

[0123] Step S4-3, construct matrix A, where,

[0124]

[0125] Step S4-4, perform singular value decomposition (SVD) on matrix A: A = U∑V T ,

[0126] Step S4-5: The least squares solution is the right singular variable corresponding to the minimum singular value, which is the last column of V. This column vector represents the three-dimensional point X in homogeneous coordinates.

[0127] After obtaining the three-dimensional coordinates of the entire space, the three-dimensional spatial volume of the multiple jets is analyzed one by one, and the intersection of the multiple jet spatial volumes is obtained to obtain the jet collision centering parameters.

[0128] Step S3: Select the fog field measurement mode, and use the control system 3 to control the mutual impact nozzle 1, optical imaging measurement system 2, and data analysis system 8 to work according to the fog field measurement mode. Simultaneously obtain parameters such as fog field atomization angle, droplet size, droplet velocity, three-dimensional velocity distribution of the fog field, atomization uniformity, and atomization concentration.

[0129] Figure 5 This is a schematic diagram of the fog field measurement mode in an embodiment of the present invention.

[0130] like Figure 5 As shown, after multiple nozzle bodies 11 are activated simultaneously, multiple jets collide at the center of the area to be measured, thereby generating a mist field of fine droplets. Images of this mist field are captured from various angles using an image sensor 22, with the center of the mist field as the image center 4 and the outer perimeter of the mist field as the outer contour 5, thus completing the imaging task required for the mist field measurement mode.

[0131] The method for determining the atomization angle of the atomization field is as follows:

[0132] The optical imaging measurement system 2 is used to perform multi-angle imaging of the atomization field to capture the geometry of the atomization field. The three-dimensional boundary of the atomization field is reconstructed using a multi-view three-dimensional contour imaging image processing algorithm to determine the atomization angle of the atomization field.

[0133] The methods for measuring droplet size, droplet velocity, and the three-dimensional velocity distribution of the atomized field are as follows:

[0134] The atomization field is imaged from multiple angles using an optical imaging measurement system 2. The obtained atomization field image is then reconstructed in three dimensions. Based on the applicable objects of the particle image velocimetry (PIV) and particle tracking velocimetry (PTV) processing algorithms, the atomization field image is processed according to the PIV image processing algorithm to obtain the three-dimensional velocity distribution of the atomization field. The droplet image is processed according to the PTV image processing algorithm to obtain the droplet size and droplet motion velocity parameters.

[0135] The data processing principle of multi-view vision reconstruction of fog field three-dimensional image is as follows: through multi-view vision contour three-dimensional imaging technology, the spatial three-dimensional image of the fog field to be tested is reconstructed, and the fog field is photographed by controlling the opening and closing of different light sources 21, thereby performing shadow imaging. The diameter and velocity of the droplets are obtained by using PIV and PTV image processing algorithms.

[0136] In this process, based on the PTV image processing algorithm to track droplet motion images, the droplet size and droplet velocity are calculated using the following formulas:

[0137] The droplet size is:

[0138]

[0139] The velocity of the droplet is:

[0140]

[0141] In the formula, a is the pixel size of the image sensor 22, m is the magnification of the lens, h is the trajectory width, and t represents the exposure time;

[0142] Based on the PIV image processing algorithm to track the droplet motion image in the atomized field, the three-dimensional velocity distribution of the atomized field is calculated using the following formula:

[0143] Cross-correlation analysis of atomized field images:

[0144]

[0145] The velocity distribution of the atomization field can be obtained:

[0146]

[0147]

[0148] In the formula, r pq(i,j) The value represents the maximum value of the cross-correlation function, and i and j represent the coordinates corresponding to the maximum value of the cross-correlation function.

[0149] Figure 6 This is a schematic diagram illustrating the principle of three-dimensional extinction tomography in an embodiment of the present invention. Figure 7 This is a flowchart of the three-dimensional extinction tomography algorithm in an embodiment of the present invention.

[0150] like Figure 6 and Figure 7 As shown, the uniformity and concentration of fogging can be analyzed using a three-dimensional extinction tomography image processing algorithm. The analysis principle is as follows: During extinction tomography, when light passes through the fog field, the absorption and scattering characteristics of tiny droplets of different diameters and densities vary, causing the light intensity to change at different positions and directions. By measuring the degree of extinction at different positions and angles, the distribution of tiny droplets in the fog field can be inferred, further analyzing the uniformity of fogging. According to the Beer-Lambert law, the transmitted light intensity is converted into extinction projection data, and the obtained extinction projection data is filtered and denoised. The filtered projection data is projected back to the imaging plane along the opposite direction of the rays. This back-projection operation is performed on projection data obtained from different angles, gradually constructing a three-dimensional tomographic image of the object layer by layer.

[0151] The atomization uniformity and atomization concentration are calculated using the following methods:

[0152] Step S7-1: Convert the projected light intensity into extinction projection data p θ (s), where I0(s) is the initial light intensity, I θ (s) represents the transmitted light intensity:

[0153]

[0154] Step S7-2, for the projection data p of each angle θ (s) performs one-dimensional convolution filtering, where * represents convolution and h(s) is the filtering function:

[0155] p filtered,θ (s)=p θ (s)*h θ (s)

[0156] Step S7-3, then perform back projection reconstruction, by backprojecting and superimposing the filtered projection data along the original path to reconstruct the extinction data distribution f(x,y):

[0157]

[0158] Step S7-4, for each pixel (x i ,y j ), calculate its projected position s = x under angle θ. i cosθ+y i sinθ, obtained from p through linear interpolation filtered,θ The corresponding value is obtained from (s) and accumulated into f(x). i ,y j ).

[0159] Step S7-5, the atomization uniformity parameter is obtained through the standard deviation σ:

[0160]

[0161] In the formula, σ is the standard deviation and CV is the coefficient of variation;

[0162] Atomization concentration parameter is obtained through average extinction coefficient get:

[0163]

[0164] The concentration n is:

[0165]

[0166] In the formula, Q ext denoted as extinction efficiency factor, and r as particle radius.

[0167] Step S4: Display and save the synchronous measurement results of multiple parameters of the mutual impact nozzle atomization, and complete the test.

[0168] The role and effect of the embodiments

[0169] The device and method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle according to the present invention have the following beneficial effects:

[0170] The present invention provides a highly integrated multi-parameter synchronous measurement device 100 for atomization of a mutual-impact nozzle. Through the control system 3, it switches between two working modes of the mutual-impact nozzle 1 and the optical imaging measurement system 2. Following the multi-parameter synchronous measurement steps, it obtains the atomization field parameters in both the jet measurement mode and the fog field measurement mode, and comprehensively evaluates the atomization field parameters. This meets the requirements for atomization performance testing and product verification of the mutual-impact nozzle 1, and helps to more accurately and comprehensively judge the atomization performance of the mutual-impact nozzle 1 and the overall working performance of the product.

[0171] The measurement method of this invention integrates multiple spray optical measurement principles such as multi-view three-dimensional contour imaging, three-dimensional extinction tomography, PIV and PTV, and forms a comprehensive image processing algorithm to realize the simultaneous measurement of multiple parameters such as atomization angle, droplet size distribution, movement speed, spray uniformity, and jet collision centering of the mutual impact nozzle 1, thus meeting the product performance testing requirements.

[0172] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A device for synchronous measurement of multiple parameters in atomization using a mutual-impact nozzle, characterized in that, include: A mutual-impact nozzle is used to generate multiple jets capable of mutual-impact atomization, and the area where the multiple jets mutually impact and atomize form an atomization field. An optical imaging measurement system is used to provide illumination and to acquire images of the jet and the atomization field; A control system is used to control the operating modes of the mutual impact nozzle and the optical imaging measurement system, as well as the opening and closing of the mutual impact nozzle and the optical imaging measurement system; The data analysis system is used to process the images of the jet and the atomization field acquired by the optical imaging measurement system to obtain atomization parameters.

2. The synchronous measurement device for multi-parameter atomization of the mutual-impact nozzle according to claim 1, Its features are: The mutual impact nozzle includes: Multiple nozzle bodies are arranged in parallel, and each nozzle body is provided with a jet hole, and the jet holes of the multiple nozzle bodies face the same point; A liquid supply device connected to each of the nozzle bodies, the liquid supply device being used to deliver liquid to the nozzle bodies, the liquid supply device being either a squeeze type or a pump type; A fixed bracket is disposed on both sides of each nozzle body to provide support for the nozzle body. One end of the fixed bracket is connected to the nozzle body and the other end is connected to the liquid supply device.

3. The synchronous measurement device for multi-parameter atomization of the mutual-impact nozzle according to claim 2, characterized in that: in, The liquid supply device is equipped with multiple valves, which are arranged in a one-to-one correspondence with the nozzle body. The valves are used to control the input of liquid into the nozzle body.

4. The synchronous measurement device for multi-parameter atomization of the mutual-impact nozzle according to claim 3, Its features are: The optical imaging measurement system includes: Multiple light sources are evenly distributed around the atomizing field, and the light emitted by the multiple light sources is directed towards the atomizing field and intersects at the center of the atomizing field; Multiple image sensors are configured in a one-to-one correspondence with the light source; Multiple optical lenses are arranged in a one-to-one correspondence with the image sensor to adjust the imaging focal plane and imaging area of ​​the image sensor; The data acquisition system is electrically connected to each of the image sensors.

5. The synchronous measurement device for multi-parameter atomization of the mutual-impact nozzle according to claim 4, Its features are: The control system includes: The liquid supply switch of the mutual impact nozzle channel is electrically connected to each of the valves respectively, and is used to control the opening and closing of the valves respectively; A light source controller is electrically connected to each of the light sources and is used to control the on / off state of each light source. An image sensor controller is electrically connected to each of the image sensors and is used to control the opening and closing of each image sensor. An integrated control unit is electrically connected to the data acquisition system, the liquid supply switch of the interlocking nozzle channel, the light source controller, and the image sensor controller, and is used to issue commands to control the opening and closing of the interlocking nozzle channel liquid supply switch, the light source controller, and the image sensor controller according to different working modes.

6. The synchronous measurement device for multi-parameter atomization of the mutual-impact nozzle according to claim 1, characterized in that: in, The mutual impact nozzle atomization multi-parameter synchronous measurement device has two working modes: jet measurement mode and fog field measurement mode. In the jet measurement mode, the working process of the multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle is as follows: the control system sends a jet measurement mode command to the liquid supply switch of the mutual-impact nozzle channel, the light source controller, and the image sensor controller; the liquid supply switch of the mutual-impact nozzle channel controls the two independent channels to work one by one to generate jets; the light source is adjusted by the light source controller and the image sensor controller, taking into account the high brightness, uniformity, and directionality of the illumination, and backlighting or sidelighting is used to generate high-contrast contours. Through multi-view vision contour 3D imaging technology, the two jets are imaged one by one. Based on the multi-view 3D contour imaging image processing algorithm, the 3D spatial volume of the two jets is analyzed one by one, and the intersection of the two jet spatial volumes is obtained, thereby evaluating the alignment of the two jets. In the fog field measurement mode, the operation of the multi-parameter synchronous measurement device for atomization using an impact nozzle is as follows: the control system sends a jet measurement mode command to the liquid supply switch of the impact nozzle channel, the light source controller, and the image sensor controller; the liquid supply switch of the impact nozzle channel controls the two independent channels to work simultaneously to generate jets, forming an atomization field; the control system sends commands to the light source controller and the image sensor controller, which capture the geometry of the spray from different perspectives using multiple cameras, and reconstruct the three-dimensional boundary of the spray using multi-view vision contour 3D imaging technology and multi-view 3D contour imaging image processing algorithms to determine the atomization angle; the light source controller provides good illumination and backlighting, and then... Image segmentation, recognition, and processing are performed. Droplet size is obtained based on the PTV image processing algorithm, and droplet size distribution, concentration, and distribution are statistically analyzed. Multiple cameras are controlled to capture the three-dimensional motion trajectory of the droplets, obtaining their three-dimensional velocity and statistically analyzing its distribution. Simultaneously, the velocity distribution of the atomized field is obtained based on the PIV image processing algorithm, and multiple cameras are controlled to capture three-dimensional images of the atomized field, obtaining its three-dimensional velocity distribution. At the same time, a light source is controlled to provide parallel light, synchronized with a high-speed camera, to obtain multi-angle extinction images of the atomized field. A three-dimensional extinction tomography algorithm is used to obtain a three-dimensional tomography analysis of the extinction values ​​of the atomized field, thereby analyzing the uniformity of the atomized field.

7. A method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle, implemented based on the synchronous measurement device for multiple parameters of atomization using a mutual-impact nozzle as described in any one of claims 1 to 6, characterized in that, include: The aforementioned impact nozzle generates multiple jets capable of mutual impact atomization, and the area where the multiple jets mutually impact and atomize forms an atomization field. An optical imaging measurement system is used to provide illumination and to acquire images of the jet and the atomization field. A control system is used to control the operating modes of the mutual impact nozzle and the optical imaging measurement system, as well as the opening and closing of the optical imaging measurement system; The images of the jet and the atomization field acquired by the optical imaging measurement system are processed using a data analysis system to obtain atomization parameters. The mutual-impact nozzle atomization multi-parameter synchronous measurement device has two working modes: jet measurement mode and fog field measurement mode. In the jet measurement mode, the working process of the multi-parameter synchronous measurement device for atomization of the mutual-impact nozzle is as follows: the control system sends a jet measurement mode command to the liquid supply switch of the mutual-impact nozzle channel, the light source controller, and the image sensor controller; the liquid supply switch of the mutual-impact nozzle channel controls the two independent channels to work one by one to generate jets; the light source is adjusted by the light source controller and the image sensor controller, taking into account the high brightness, uniformity, and directionality of the illumination, and backlighting or sidelighting is used to generate high-contrast contours. Through multi-view vision contour 3D imaging technology, the two jets are imaged one by one. Based on the multi-view 3D contour imaging image processing algorithm, the 3D spatial volume of the two jets is analyzed one by one, and the intersection of the two jet spatial volumes is obtained, thereby evaluating the alignment of the two jets. In the fog field measurement mode, the operation of the multi-parameter synchronous measurement device for atomization using an impact nozzle is as follows: the control system sends a jet measurement mode command to the liquid supply switch of the impact nozzle channel, the light source controller, and the image sensor controller; the liquid supply switch of the impact nozzle channel controls the two independent channels to work simultaneously to generate jets, forming an atomization field; the control system sends commands to the light source controller and the image sensor controller, which capture the geometry of the spray from different perspectives using multiple cameras, and reconstruct the three-dimensional boundary of the spray using multi-view vision contour 3D imaging technology and multi-view 3D contour imaging image processing algorithms to determine the atomization angle; the light source controller provides good illumination and backlighting, and then... Image segmentation, recognition, and processing are performed. Droplet size is obtained based on the PTV image processing algorithm, and droplet size distribution, concentration, and distribution are statistically analyzed. Multiple cameras are controlled to capture the three-dimensional motion trajectory of the droplets, obtaining their three-dimensional velocity and statistically analyzing its distribution. Simultaneously, the velocity distribution of the atomized field is obtained based on the PIV image processing algorithm, and multiple cameras are controlled to capture three-dimensional images of the atomized field, obtaining its three-dimensional velocity distribution. At the same time, a light source is controlled to provide parallel light, synchronized with a high-speed camera, to obtain multi-angle extinction images of the atomized field. A three-dimensional extinction tomography algorithm is used to obtain a three-dimensional tomography analysis of the extinction values ​​of the atomized field, thereby analyzing the uniformity of the atomized field.

8. The method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle according to claim 7, characterized in that: in, The atomization parameters include one or more of the following: jet impact pair neutrality, atomization angle of the atomization field, droplet size, droplet velocity, three-dimensional velocity distribution of the atomization field, atomization uniformity, and atomization concentration. The method for measuring the neutrality of the jet impact is as follows: The optical imaging measurement system is used to acquire images of the multiple jets, and then the data analysis system is used to process the images of the multiple jets to obtain the jet hit-and-alignment parameters. The neutrality parameter of the jet impact pair was obtained using a multi-view three-dimensional contour imaging image processing algorithm and was calculated according to the following formula: Projection matrix P i In the coordinate system, the point X = [X, Y, Z, 1] T Projected onto the image plane point x i =[x i ,y i ,1] T The following relationship exists: s i x i =P i X s i x i =M i1 X+M i2 Y+M i3 Z+m i1 s i y i =M i4 X+M i5 Y+M i6 Z+m i2 s i =M i7 X+M i8 Y+M i9 Z+m i3 s i Substituting the first two equations, solving the above equation yields AX = 0, where... Perform singular value decomposition (SVD) on matrix A: A = U∑V T The least squares solution is the right singular variable corresponding to the minimum singular value, which is the last column of V. This column vector represents the three-dimensional point X in homogeneous coordinates. After obtaining the three-dimensional coordinates of the entire space, the three-dimensional spatial volumes of the multiple jets are analyzed one by one, and the intersection of the multiple jet spatial volumes is obtained to obtain the jet collision centering parameters.

9. The method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle according to claim 7, characterized in that: in, The method for determining the atomization angle of the atomization field is as follows: The optical imaging measurement system is used to perform multi-angle imaging of the atomization field to capture the geometry of the atomization field, and the multi-view three-dimensional contour imaging image processing algorithm is used to reconstruct the three-dimensional boundary of the atomization field in order to determine the atomization angle of the atomization field. The methods for measuring the droplet size, the droplet velocity, and the three-dimensional velocity distribution of the atomization field are as follows: The optical imaging measurement system is used to image the atomized field from multiple angles. Then, the obtained atomized field images are reconstructed in three dimensions. Based on the applicable algorithms of Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV), the atomized field images are processed using the PIV image processing algorithm to obtain the three-dimensional velocity distribution of the atomized field. The droplet images are processed using the PTV image processing algorithm to obtain the droplet size and droplet velocity parameters. Based on the PTV image processing algorithm, the droplet motion image is tracked, and the droplet size and droplet velocity are calculated using the following formula: The droplet size is: The velocity of the droplet is: In the formula, a is the pixel size of the image sensor, m is the magnification of the lens, h is the trajectory width, and t represents the exposure time; The three-dimensional velocity distribution of the atomized field is calculated using the following formula based on the PIV image processing algorithm that tracks the droplet motion image in the atomized field: Cross-correlation analysis of the atomized field image: The velocity distribution of the atomization field can be obtained as follows: In the formula, r pq(i,j) The value represents the maximum value of the cross-correlation function, and i and j represent the coordinates corresponding to the maximum value of the cross-correlation function.

10. The method for synchronous measurement of multiple parameters of atomization using a mutual-impact nozzle according to claim 7, characterized in that: in, The atomization uniformity and the atomization concentration are calculated using the following method: Convert the projected light intensity into extinction projection data p θ (s), where I0(s) is the initial light intensity, I θ (s) represents the transmitted light intensity: Projection data p for each angle θ (s) performs one-dimensional convolution filtering, where * represents convolution and h(s) is the filtering function: p filtered,θ (s)=p θ (s)*h θ (s) Then, backprojection reconstruction is performed, and the filtered projection data is backprojected and superimposed along the original path to reconstruct the extinction data distribution f(x,y): For each pixel (x) i ,y j ), calculate its projected position s = x under angle θ. i cosθ+y i sinθ, obtained from p through linear interpolation filtered,θ The corresponding value is obtained from f(s) and accumulated into f(x). i ,y j ). The atomization uniformity parameter is obtained through the standard deviation σ: In the formula, σ is the standard deviation and CV is the coefficient of variation; The atomization concentration parameter is obtained through the average extinction coefficient. get: The concentration n is: In the formula, Q ext denoted as extinction efficiency factor, and r as particle radius.

Images