Optical measuring device and test method for a nozzle test chamber

Abstract

The application discloses an optical measuring device and a test method for a nozzle test cabin, and belongs to the technical field of nozzle atomization characteristic testing. The optical measuring device comprises a guide rail assembly, a camera, a light source and a laser particle size analyzer. The guide rail assembly comprises a first guide rail and two second guide rails arranged in parallel with each other. The camera, the light source and the laser particle size analyzer are respectively movable along the corresponding guide rails through a moving platform. The light source is arranged on the second guide rails and is oppositely arranged, and is used for forming an illumination area for spray imaging in the nozzle test cabin. The emitting end and the receiving end of the laser particle size analyzer are arranged on different second guide rails respectively, and are used for forming laser rays passing through the spray area of the nozzle. The application can realize continuous testing of various spray characteristics under the same test working condition and unified spatial reference, and improve the spatial consistency and repeatability of the test results.

Description

Technical Field

[0001] This application relates to the field of nozzle atomization characteristic testing technology, specifically to an optical measurement device and testing method for a nozzle test chamber. Background Technology

[0002] As a key component in combustion, spraying, cooling, and atomization delivery systems, the nozzle's spray particle size distribution, spray morphology, and spatial evolution characteristics directly affect the system's performance and stability. To evaluate the nozzle's atomization performance, optical tests of the nozzle spray are typically conducted in a test chamber. For example, a laser particle size analyzer can be used to obtain atomized particle size information, and a camera can be used to capture images of the spray morphology.

[0003] Optical testing in existing nozzle test chambers is typically performed using independently arranged measuring equipment, with different equipment often mounted on their own supports or installation structures. When atomized particle size measurement and spray imaging need to be performed sequentially within the same test chamber, it is usually necessary to disassemble, reposition, or repeatedly align the testing equipment, making the testing process cumbersome and prone to introducing human error. Furthermore, due to the lack of a unified spatial reference for different testing equipment, it is difficult to accurately correlate the spatial positions of various test results, affecting the comparability and correlation analysis of spray particle size data and spray morphology data.

[0004] Furthermore, in unconventional nozzle test chamber environments, the limited internal space and fixed observation window positions significantly restrict the installation and adjustment of testing equipment. Existing technologies often rely on manual experience to adjust the light source, camera, and laser measurement device one by one, making it difficult to maintain a stable and consistent spatial reference throughout different testing processes. Repeated tests often require recalibration, resulting in low testing efficiency.

[0005] Application content This application provides an optical measurement device and test method for a nozzle test chamber to solve the technical problem that the dispersed installation of different optical testing equipment and the lack of uniform spatial reference in existing nozzle test chambers result in poor comparability and repeatability of atomized particle size measurement and spray imaging test results.

[0006] According to one aspect of this application, an optical measurement device for a nozzle test chamber is provided, including a guide rail assembly, a camera, a light source, and a laser particle size analyzer; The guide rail assembly includes a first guide rail and two second guide rails, the two second guide rails being arranged parallel to each other; A first movable platform for supporting the camera is slidably mounted on the first guide rail; Each second guide rail is equipped with a second moving platform and a third moving platform. The second moving platform is used to support the light source, and the light outlets of the light sources on the two second guide rails are arranged opposite each other to form an illumination area for spray imaging inside the nozzle test chamber. The laser particle size analyzer includes a transmitter and a receiver, which are respectively mounted on different third moving platforms to form laser beams that pass through the nozzle test chamber. The camera is used to photograph the spray formed inside the nozzle test chamber under the illumination of the light source.

[0007] Optionally, the bottom of the second guide rail is provided with at least two support seats, which are used to adjust the height of the second guide rail in the vertical direction and / or the attitude in the horizontal direction; the laser particle size analyzer is used to form a laser spot at the observation window of the nozzle test chamber, and the relative positional relationship between the laser spot and the center of the observation window is used to provide a calibration basis for the height and / or attitude adjustment of the second guide rail.

[0008] Optionally, the second and / or third mobile platforms are provided with locking components, which are used to lock the mobile platform at a predetermined position on the second guide rail after the corresponding mobile platform has completed position adjustment.

[0009] Optionally, the second moving platform includes a moving block, a vertical support rod, and a horizontal support rod; the moving block is slidably engaged with the second guide rail, the vertical support rod is fixedly mounted on the moving block, and the horizontal support rod is fixedly mounted at the end of the vertical support rod away from the moving block; the light source is slidably engaged with the horizontal support rod along the length direction of the horizontal support rod to achieve position adjustment of the light source relative to the second guide rail in the horizontal direction.

[0010] According to another aspect of this application, a test method for a nozzle test chamber is also provided, comprising the following steps: S1. Under the condition that the working parameters of the nozzle test chamber are set and remain unchanged, the transmitter and receiver of the laser particle size analyzer are respectively located at the observation windows opposite to each other in the nozzle test chamber. The atomized particle size of the nozzle spray is measured by passing the laser beam through the nozzle spray area. S2. After completing the atomized particle size measurement, move the laser particle size analyzer along the guide rail assembly so that the laser beam avoids the central area of ​​the observation window of the nozzle test chamber. S3. Move the light source along the guide rail assembly so that the light sources arranged opposite each other are located at the observation window of the nozzle test chamber, forming an illumination beam area that illuminates each other and intersects within the nozzle test chamber. S4. Within the illumination beam area, the nozzle spray is imaged and acquired by a camera to obtain image information of the nozzle spray.

[0011] Optionally, before performing step S1, the following calibration steps may also be included: By using the transmitter and receiver of a laser particle size analyzer positioned relative to the observation window in the nozzle test chamber, the laser beam emitted by the transmitter leaves a laser spot as it passes through the observation window. Simultaneously, the receiver stably receives the laser signal. Based on the relative positional relationship between the laser spot and the center of the observation window, the height and / or attitude of the guide rail assembly are adjusted to ensure that the guide rail assembly is in a predetermined spatial installation state, thereby completing the spatial calibration of the guide rail assembly relative to the nozzle test chamber.

[0012] Optionally, after the calibration step and before performing step S1, the following steps may also be included: Using the geometric center marks of the 0° and 180° observation windows of the nozzle test chamber as spatial references; by moving the transmitting end and receiving end of the laser particle size analyzer along the guide rail assembly, the geometric center of the laser spot formed by the transmitting end at the 0° and 180° observation windows is aligned with the center mark of the corresponding observation window, and the receiving end obtains a stable receiving signal, and the position of the third moving platform carrying the laser particle size analyzer at this time is defined as the first measurement position; By moving the light source along the guide rail assembly, the geometric center of the circular illumination spot formed by the light source at the 0° and 180° observation windows is aligned with the center mark of the observation window, and the position of the second moving platform carrying the light source at this time is defined as the second measurement position. In step S1, the third moving platform is reset to the first measurement position; in step S3, the second moving platform is reset to the second measurement position.

[0013] Optionally, after completing the atomized particle size measurement in step S1, without changing the nozzle oil supply parameters and test chamber operating parameters, the nozzle is kept in a continuous spray state, and steps S2 to S4 are executed without interruption of the continuous spray state.

[0014] Optionally, after completing one atomization characteristic test from step S1 to step S4, by keeping the first and second measurement positions unchanged, and without recalibrating the guide rail and establishing the axis, the nozzle oil supply parameters and / or the operating parameters in the nozzle test chamber are changed, and the atomization particle size measurement and spray imaging acquisition are repeated on the nozzle spray to obtain multiple sets of atomization characteristic data under the same measurement reference axis.

[0015] In summary, this application includes at least one of the following beneficial technical effects: This design utilizes a first guide rail and two parallel second guide rails outside the test chamber. Movable platforms supporting the camera, light source, and laser particle size analyzer are slidably mounted on these rails, allowing various optical testing devices to switch positions along a predetermined direction within the same structural system without disassembly or rearrangement. The light source, positioned opposite each other on the second guide rails, forms a stable spray imaging illumination area within the test chamber. The laser particle size analyzer's transmitter and receiver are mounted on separate second guide rails, forming a through-type laser measurement optical path within the spray area. The camera captures images of the spray through the first guide rail. This structure enables continuous atomized particle size measurement and spray imaging under the same test conditions and a unified spatial installation reference, effectively avoiding spatial deviation problems caused by dispersed equipment installation and repeated alignment in existing technologies. This improves the spatial consistency, comparability, and repeatability of different spray test results.

[0016] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the optical measurement device used in the nozzle test chamber of this application; Figure 2 This is a schematic diagram of the structure of the locking component in this application; Figure 3 This is a schematic diagram of the structure of the second mobile platform of this application; Figure 4 This is a schematic diagram illustrating the spray imaging process used in this application. Figure 5 This is a schematic diagram illustrating the laser particle size analysis performed in this application.

[0018] Legend: 1. Guide rail assembly; 11. First guide rail; 12. Second guide rail; 2. Camera; 3. Light source; 4. Laser particle size analyzer; 41. Transmitter; 42. Receiver; 5. First moving platform; 6. Second moving platform; 61. Moving block; 62. Vertical support rod; 63. Horizontal support rod; 7. Third moving platform; 8. Support base; 9. Locking assembly; 91. Angle code; 92. Locking bolt; 93. Locking nut; 10. Observation window. Detailed Implementation

[0019] The embodiments of this application are described in detail below with reference to the accompanying drawings; however, this application may be implemented in a variety of different ways as defined and covered below.

[0020] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0021] This application discloses an optical measurement device and testing method for a nozzle test chamber.

[0022] Reference Figure 1 An optical measurement device for a nozzle test chamber includes a guide rail assembly 1, a camera 2, a light source 3, and a laser particle size analyzer 4. The guide rail assembly 1 includes a first guide rail 11 and two second guide rails 12, which are arranged parallel to each other. A first moving platform 5 for supporting the camera 2 is slidably mounted on the first guide rail 11. A second moving platform 6 and a third moving platform 7 are slidably mounted on each second guide rail 12. The second moving platform 6 is used to support the light source 3, and the light outlets of the light source 3 on the two second guide rails 12 are arranged opposite to each other to form an illumination area for spray imaging inside the nozzle test chamber. The laser particle size analyzer 4 includes a transmitter 41 and a receiver 42, which are respectively mounted on different third moving platforms 7 to form laser rays passing through the nozzle test chamber. The camera 2 is used to photograph the spray formed inside the nozzle test chamber under the illumination of the light source 3.

[0023] In this embodiment, the guide rail assembly 1 is integrally arranged on the outside of the nozzle test chamber and is correspondingly set with the observation window 10 of the nozzle test chamber. The first guide rail 11 is arranged along the nozzle spray imaging direction and is used to support the camera 2 and adjust the position of the camera 2 relative to the nozzle test chamber to adapt to different spray imaging field of view requirements. The camera 2 is fixedly mounted on the first moving platform 5, which can slide along the first guide rail 11 to realize rapid adjustment of the position of the camera 2. Two second guide rails 12 are respectively set outside the observation windows 10 on opposite sides of the nozzle test chamber and remain parallel to each other. Each second guide rail 12 is respectively provided with a second moving platform 6 for supporting the light source 3 and a third moving platform 7 for supporting the transmitter 41 or receiver 42 of the laser particle size analyzer 4. The light source 3 is mounted on the second moving platform 6, and the light outlets of the light source 3 located on the two second guide rails 12 are arranged opposite each other. When the light source 3 moves to the corresponding position of the observation window 10, a stable spray imaging illumination area can be formed inside the nozzle test chamber. The laser particle size analyzer 4 has its transmitter 41 and receiver 42 fixedly mounted on different third moving platforms 7. When the third moving platform 7 moves along the second guide rail 12 to the measurement position, the laser beam emitted by the transmitter 41 can pass through the spray area inside the nozzle test chamber and be received by the receiver 42, thereby realizing the measurement of the atomized particle size of the nozzle spray. By uniformly mounting the camera 2, light source 3, and laser particle size analyzer 4 on the same guide rail assembly 1, each optical testing device can switch positions within the nozzle test chamber by moving along the guide rail without disassembly or reinstallation, providing a unified and stable structural basis for multi-parameter optical testing of nozzle spray.

[0024] In one embodiment, at least two support seats 8 are provided at the bottom of the second guide rail 12. The support seats 8 are used to adjust the height of the second guide rail 12 in the vertical direction and / or the attitude in the horizontal direction. The laser particle size analyzer 4 forms a laser spot at the observation window 10 of the nozzle test chamber. The relative positional relationship between the laser spot and the center of the observation window 10 is used to provide a calibration basis for the height and / or attitude adjustment of the second guide rail 12.

[0025] To ensure that the second guide rails 12 located on both sides of the nozzle test chamber maintain a good spatial correspondence with the observation window 10 of the nozzle test chamber, at least two support seats 8 are provided at the bottom of each second guide rail 12. The support seats 8 are preferably installed at both ends of the second guide rail 12 or spaced apart along the length direction, providing support for the second guide rail 12 through multiple support points, thereby improving the overall stability of the second guide rail 12 after installation.

[0026] The support base 8 can adopt an adjustable structure, for example, including a support base and an adjustable support screw. The support screw is fixedly connected to the second guide rail 12. By rotating the support screw, the height of the second guide rail 12 in the vertical direction can be finely adjusted. At the same time, by adjusting the height of multiple support bases 8 respectively, the horizontal orientation of the second guide rail 12 can also be adjusted, so that the second guide rail 12 remains horizontal or in a predetermined orientation in the length direction. In this way, the height and orientation of the second guide rail 12 can be adjusted without disassembling it, which is convenient.

[0027] After the initial installation of the second guide rail 12 is completed, the laser particle size analyzer 4 is installed on the third moving platform 7, and the emitting end 41 and receiving end 42 of the laser particle size analyzer 4 are moved along the second guide rail 12 to the corresponding positions of the observation window 10 of the nozzle test chamber. In this state, the emitting end 41 emits a laser beam, which passes through the observation window 10 and leaves a laser spot on the observation window 10. The position of the receiving end 42 on the second guide rail 12 is finely adjusted so that after the laser beam passes through the two opposing observation windows 10 of the nozzle test chamber, the receiving end 42 can receive a stable laser signal. By observing the relative positional relationship between the laser spot and the center of the observation window 10, such as whether the spot is located at the center of the observation window 10, the installation status of the second guide rail 12 in the height and attitude directions can be intuitively judged. When the laser spot is deviated from the center of the observation window 10, whether it is too high, too low, or tilted, the height of the corresponding support 8 is adjusted to make targeted adjustments to the second guide rail 12 until the laser spot and the center of the observation window 10 reach the predetermined positional relationship. Through the above process, the laser spot formed by the laser particle size analyzer 4 is used as a visual reference to calibrate the height and / or attitude of the second guide rail 12, so that the second guide rail 12 forms a stable and repeatable correspondence with the observation window 10 of the nozzle test chamber in space, providing a unified and reliable spatial basis for subsequent laser particle size measurement, illumination by the light source 3 and nozzle imaging.

[0028] Specifically, the adjustable structure can achieve height adjustment through pads of different thicknesses or by using a screw adjustment structure. If pads are used, they can be metal shims or other structural components with sufficient strength. By increasing or decreasing the number of pads or replacing them with pads of different thicknesses between the support base and the second guide rail 12, the installation height of the second guide rail 12 at corresponding positions can be changed. When multiple support seats 8 are provided at the bottom of the second guide rail 12, by selecting pads of different thicknesses at different support seats 8, the overall posture of the second guide rail 12 can be adjusted to achieve a predetermined height and posture. If an adjustment screw is used, one end of the adjustment screw abuts or is fixedly connected to the second guide rail 12 or a mounting component fixedly connected to the second guide rail 12. By rotating the adjustment screw, the vertical height of the second guide rail 12 can be continuously changed; when multiple support seats 8 are provided at the bottom of the second guide rail 12, by adjusting the adjustment screws of each support seat 8 individually, fine adjustment of the overall posture of the second guide rail 12 can be achieved.

[0029] Reference Figure 2 and Figure 3 In one embodiment, a locking component 9 is provided on the second mobile platform 6 and / or the third mobile platform 7. The locking component 9 is used to lock the mobile platform at a predetermined position on the second guide rail 12 after the corresponding mobile platform has completed the position adjustment.

[0030] To maintain relative position stability after the position adjustment of the light source 3 or the laser particle size analyzer 4 is completed, a locking component 9 is provided on the second moving platform 6 and / or the third moving platform 7. The locking component 9 is used to reliably fix the moving platform at a predetermined position on the second guide rail 12 after the position adjustment of the moving platform is completed, so as to prevent the moving platform from being displaced during the test due to vibration, external force or the weight of the equipment.

[0031] The locking component 9 can adopt various structural forms. In one embodiment, the locking component 9 includes a corner bracket 91, a locking bolt 92, and a locking nut 93. The corner bracket 91 is fixed on the second moving platform 6 or the third moving platform 7, and the locking nut 93 is slidably disposed in the groove of the second guide rail 12. When the locking bolt 92 and the locking nut 93 are engaged and locked, the moving platform is locked on the second guide rail 12 by the friction between the locking nut 93 and the second guide rail 12. When the locking bolt 92 is loosened, the moving platform can slide freely along the second guide rail 12, thereby realizing position adjustment.

[0032] In one embodiment, the second moving platform 6 includes a moving block 61, a vertical support rod 62, and a horizontal support rod 63. The moving block 61 is slidably engaged with the second guide rail 12. The vertical support rod 62 is fixedly mounted on the moving block 61, and the horizontal support rod 63 is fixedly mounted at the end of the vertical support rod 62 away from the moving block 61. The light source 3 is slidably engaged with the horizontal support rod 63 along its length direction to achieve position adjustment of the light source 3 relative to the second guide rail 12 in the horizontal direction. The second moving platform 6 adopts a three-dimensional support structure composed of the moving block 61, the vertical support rod 62, and the horizontal support rod 63. This structure is used to achieve position adjustment of the light source 3 in the vertical and horizontal directions while ensuring that the light source 3 can move along the direction of the second guide rail 12, thereby improving the spatial adaptability between the light source 3 and the observation window 10 of the nozzle test chamber. The moving block 61, as the basic component of the second moving platform 6, is slidably engaged with the second guide rail 12. The movable block 61 can be mounted on the second guide rail 12 via a slider, roller, or profile groove structure, enabling the second moving platform 6 to move smoothly along the length of the second guide rail 12. By sliding the movable block 61, the overall position of the light source 3 in the guide rail direction can be adjusted.

[0033] A vertical support rod 62 is fixedly mounted on the movable block 61 and extends vertically to raise the light source 3 to a position matching the height of the observation window 10 of the nozzle test chamber. The vertical support rod 62 can be a single or multiple rods, and its length is set according to the structural dimensions of the nozzle test chamber to ensure that the light source 3's output port is within a suitable height range. A horizontal support rod 63 is fixedly mounted at the end of the vertical support rod 62 away from the movable block 61 and extends horizontally. The light source 3 is mounted on the horizontal support rod 63 and can slide along the length of the horizontal support rod 63. By moving the light source 3 along the horizontal support rod 63, the position of the light source 3 relative to the second guide rail 12 in the horizontal direction can be adjusted so that the light source 3's output port is aligned with the center position of the observation window 10 of the nozzle test chamber, or adjusted laterally according to actual imaging requirements.

[0034] Both the first guide rail 11 and the second guide rail 12 preferably adopt a profile guide rail structure with linear guiding function. The guide rail body can be an aluminum profile or a steel profile, and its cross-section has guide grooves or slide rail surfaces for installing sliding components, so that each moving platform can slide stably along the length of the guide rail. The guide rail is fixedly installed on the mounting frame, support frame or ground base outside the test chamber by connectors, thereby providing a reliable load-bearing foundation for the optical equipment.

[0035] The length of the first guide rail 11 is aligned with the nozzle spray imaging direction. Its length is set according to the structural dimensions of the nozzle test chamber and the imaging requirements of the camera 2 to ensure that the camera 2 can cover the required spray imaging field of view within the guide rail's movement range. The first guide rail 11 can be fixed to the mounting structure by bolts, pressure plates, or connecting seats to ensure its stability during use.

[0036] Two second guide rails 12 are respectively arranged on opposite sides of the nozzle test chamber, with their length direction perpendicular to the laser propagation direction of the laser particle size analyzer 4. By setting the second guide rails 12 as a parallel structure, the transmitting end 41 and the receiving end 42 mounted on the second guide rails 12 maintain a relative positional relationship as they move along the guide rails, which is beneficial for the alignment and transmission of the laser beam within the nozzle test chamber. The length of the second guide rails 12 can cover the switching range between the illumination position of the light source 3 and the laser particle size analysis measurement position, to meet the equipment layout requirements under different testing conditions.

[0037] In one embodiment, the guide rail body is provided with scale marks or positioning holes to indicate the position of the moving platform on the guide rail. When the moving platform moves along the guide rail to a predetermined position, the position can be quickly reproduced through the scale marks or positioning holes, thereby improving the repeatability of the testing process and operational efficiency. The scale marks can be graduations, rulers, or other visual markers, and the positioning holes can be used in conjunction with positioning pins on the moving platform.

[0038] Reference Figure 4 and Figure 5 This embodiment also discloses a test method for a nozzle test chamber, including the following steps: S1. Under the condition that the working parameters of the nozzle test chamber are set and remain unchanged, the transmitting end 41 and receiving end 42 of the laser particle size analyzer 4 are respectively located at the observation window 10 opposite to each other in the nozzle test chamber. The atomized particle size of the nozzle spray is measured by passing the laser beam through the nozzle spray area. S2. After completing the atomized particle size measurement, move the laser particle size analyzer 4 along the guide rail assembly 1 so that the laser beam avoids the central area of ​​the observation window 10 of the nozzle test chamber. S3. Move the light source 3 along the guide rail assembly 1 so that the light source 3, which is set opposite to each other, is located at the observation window 10 of the nozzle test chamber, forming an illumination beam area that illuminates each other and intersects within the nozzle test chamber. S4. Within the illumination beam area, the camera 2 captures images of the nozzle spray to obtain image information of the nozzle spray.

[0039] In the specific implementation process, the nozzle is first installed in the nozzle test chamber, and the operating parameters of the nozzle test chamber are set, including nozzle oil supply parameters and test chamber environmental parameters, which are kept constant during the test. Then, the nozzle is started to spray. In step S1, the transmitting end 41 and receiving end 42 of the laser particle size analyzer 4 are positioned at the opposite observation windows 10 of the nozzle test chamber, so that the laser beam emitted by the transmitting end 41 passes through the nozzle spray area and is received by the receiving end 42, thereby measuring the atomized particle size of the nozzle spray and obtaining the particle size distribution data of the nozzle spray. After completing the atomized particle size measurement, step S2 is entered, and the laser particle size analyzer 4 is moved along the guide rail assembly 1 so that the laser beam avoids the central area of ​​the observation window 10 of the nozzle test chamber to prevent the laser beam from interfering with the subsequent spray imaging process. Subsequently, step S3 is executed, moving the light source 3 along the guide rail assembly 1 so that the light sources 3, located on opposite sides of the nozzle test chamber, are positioned at the observation windows 10. This allows the light from both sides to illuminate and converge within the nozzle test chamber, forming an illumination beam area for spray imaging in the nozzle spray region. In step S4, within the aforementioned illumination beam area, the camera 2 captures images of the nozzle spray, obtaining image information of the nozzle spray under illumination conditions to characterize the spray morphology and distribution characteristics. Through this experimental method, while maintaining constant operating parameters of the nozzle test chamber, the atomization particle size measurement and spray imaging acquisition of the nozzle spray can be completed sequentially within the same test chamber. This avoids the disassembly and re-arrangement of the testing equipment, improving the continuity and operational efficiency of the spray testing process.

[0040] In one embodiment, before performing step S1, a calibration step is further included: The laser beam emitted by the laser particle size analyzer 4, positioned relative to the observation window 10 in the nozzle test chamber, leaves a laser spot as it passes through the observation window 10, while the receiver 42 stably receives the laser signal. Based on the relative positional relationship between the laser spot and the center of the observation window 10, the height and / or attitude of the guide rail assembly 1 are adjusted to ensure that the guide rail assembly 1 is in a predetermined spatial installation state, thereby completing the spatial calibration of the guide rail assembly 1 relative to the nozzle test chamber.

[0041] To ensure a stable and repeatable spatial correspondence between the installation position of the guide rail assembly 1 outside the nozzle test chamber and the observation window 10 of the nozzle test chamber, the guide rail assembly 1 is spatially calibrated before performing the atomized particle size measurement step. Specifically, the laser particle size analyzer 4 is installed on the third moving platform 7, and the emitting end 41 and receiving end 42 of the laser particle size analyzer 4 are moved along the second guide rail 12 to the corresponding positions of the observation window 10 of the nozzle test chamber. In this state, the emitting end 41 emits a laser beam, which passes through the observation window 10 and leaves a laser spot on the observation window 10. The position of the receiving end 42 on the second guide rail 12 is finely adjusted so that after the laser beam passes through the two opposing observation windows 10 of the nozzle test chamber, the receiving end 42 can receive a stable laser signal. The spatial installation state of the second guide rail 12 is judged by observing the relative positional relationship between the laser spot and the center of the observation window 10. When the laser spot deviates above, below, or skewed relative to the center of the observation window 10, it indicates a deviation in the vertical height or horizontal orientation of the second guide rail 12. In this case, by adjusting the support base 8 at the bottom of the second guide rail 12, the vertical height and / or horizontal orientation of the second guide rail 12 can be adjusted, causing the laser spot to gradually move towards the predetermined position along the outline of the observation window 10.

[0042] During the adjustment process, the laser particle size analyzer 4 can be repeatedly moved and the positional change of the laser spot at the observation window 10 can be observed until the laser spot and the center of the observation window 10 reach a predetermined positional relationship, for example, the laser spot is located at the center of the observation window 10. Through the above adjustment process, the second guide rail 12 is made to form a stable correspondence with the observation window 10 of the nozzle test chamber in space. After the above adjustment is completed, the guide rail assembly 1 is in the predetermined spatial installation state, thereby completing the spatial calibration of the guide rail assembly 1 relative to the nozzle test chamber. The calibrated guide rail assembly 1 can serve as a unified spatial reference for the movement and switching of various optical devices during subsequent nozzle spray testing, providing a reliable structural basis for atomized particle size measurement and spray imaging testing.

[0043] In one embodiment, after the calibration step and before performing step S1, the following steps are further included: using the geometric center marks of the 0° and 180° observation windows 10 of the nozzle test chamber as spatial references; moving the emitting end 41 and receiving end 42 of the laser particle size analyzer 4 along the guide rail assembly 1, so that the geometric center of the laser beam emitted by the emitting end 41 at the point where it passes through the 0° and 180° observation windows 10 is aligned with the center mark of the corresponding observation window 10, and the receiving end 42 obtains a stable receiving signal, and defining the position of the third moving platform 7 carrying the laser particle size analyzer 4 at this time as the first measurement position; moving the light source 3 along the guide rail assembly 1, so that the geometric center of the circular illumination spot formed by the light source 3 at the 0° and 180° observation windows 10 is aligned with the center mark of the corresponding observation window 10, and defining the position of the second moving platform 6 carrying the light source 3 at this time as the second measurement position; in step S1, resetting the third moving platform 7 to the first measurement position; in step S3, resetting the second moving platform 6 to the second measurement position.

[0044] Specifically, the geometric center marks of the 0° and 180° observation windows 10 of the nozzle test chamber are used as spatial references. The transmitting end 41 and receiving end 42 of the laser particle size analyzer 4 are respectively mounted on the third moving platform 7 located on both sides of the nozzle test chamber, and the transmitting end 41 and receiving end 42 are moved along the second guide rail 12 to the corresponding positions of the observation windows 10 of the nozzle test chamber. In this state, the transmitting end 41 emits a laser beam, which passes through the 0° and 180° observation windows 10 of the nozzle test chamber and leaves a laser spot on the observation window 10. By adjusting the positions of the transmitting end 41 and receiving end 42 of the laser particle size analyzer 4 on the second guide rail 12, the geometric center of the laser spot is aligned with the center mark of the corresponding observation window 10, and the receiving end 42 stably receives the laser signal. At this time, the line connecting the geometric centers of the laser spots at the two observation windows 10 is determined as the measurement reference axis used in the nozzle spray test, and the position of the third moving platform 7 carrying the laser particle size analyzer 4 at this time is defined as the first measurement position.

[0045] After determining the aforementioned measurement reference axis, the light source 3 is installed on the second moving platform 6 and moved along the second guide rail 12, positioning it at the corresponding positions of the 0° and 180° observation windows 10 in the nozzle test chamber. In this state, the light source 3 forms a circular illumination spot at the corresponding observation window 10. By adjusting the position of the light source 3 on the second guide rail 12, the geometric center of the circular illumination spot is aligned with the center mark of the corresponding observation window 10. Through this adjustment, the line connecting the circular illumination spots formed by the light sources 3 on the second moving platforms 6 on both sides of the nozzle test chamber in the observation window 10 is aligned with the aforementioned measurement reference line, and the position of the second moving platform 6 carrying the light source 3 at this time is defined as the second measurement position. During the subsequent execution of steps S1 and S3 to switch the optical equipment, by resetting the third moving platform 7 to the first measurement position and the second moving platform 6 to the second measurement position, the laser particle size analyzer 4 and the light source 3 are arranged based on the same measurement reference axis in different test stages, thereby ensuring the consistency of the spatial position between atomized particle size measurement and spray imaging acquisition.

[0046] In one embodiment, after the atomized particle size measurement is completed in step S1, the nozzle is kept in a continuous spray state without changing the nozzle oil supply parameters and the test chamber operating parameters, and steps S2 to S4 are performed without interruption of the continuous spray state.

[0047] Specifically, during step S1, which measures the atomized particle size of the nozzle spray, the operating parameters of the nozzle test chamber remain unchanged, including the nozzle oil supply parameters and the environmental parameters within the test chamber. After completing the atomized particle size measurement, the nozzle is not shut off or stopped; instead, subsequent test steps are performed directly while maintaining continuous spraying. While maintaining continuous spraying, the laser particle size analyzer 4 is moved along the second guide rail 12 to avoid interference from the central area of ​​the observation window 10 of the nozzle test chamber. Subsequently, while maintaining continuous spraying, the light source 3 is moved along the second guide rail 12 so that the opposing light sources 3 are positioned at the observation window 10 of the nozzle test chamber, forming opposing and intersecting illumination beam areas within the nozzle test chamber. Under the aforementioned continuous spraying conditions, the camera 2 captures images of the nozzle spray within the illumination beam area to obtain image information of the nozzle spray. Since the nozzle maintains continuous spraying throughout the process from the completion of atomized particle size measurement to the acquisition of spray imaging, and the operating parameters of the test chamber do not change, the atomized particle size measurement results and the spray imaging results can correspond to the same spraying state.

[0048] In one embodiment, after completing the atomization characteristic test of steps S1 to S4, by keeping the first and second measurement positions unchanged, and without recalibrating the guide rail and establishing the axis, the nozzle oil supply parameters and / or the operating parameters in the nozzle test chamber are changed, and the atomization particle size measurement and spray imaging acquisition are repeatedly performed on the nozzle spray to obtain multiple sets of atomization characteristic data under the same measurement reference axis.

[0049] Specifically, after completing one atomization particle size measurement and spray imaging acquisition, the first and second measurement positions remain unchanged, and the spatial calibration of the guide rail assembly 1 is not re-performed, nor is the measurement reference axis re-established. Under the above conditions, by changing the nozzle oil supply parameters and / or the operating parameters within the nozzle test chamber, steps S1 to S4 can be executed again to repeat the atomization particle size measurement and spray imaging acquisition of the nozzle spray. During the test, since the spatial installation state of the guide rail assembly 1, the measurement reference axis, and the measurement positions of each optical device remain unchanged, the atomization particle size data and spray imaging data obtained under different operating conditions all correspond to the same spatial position. By comparing and analyzing the test results under multiple operating conditions, the variation law of the nozzle spray test results with environmental parameters and oil supply parameters can be effectively evaluated. Through the above testing method, the error accumulation problem caused by the need to reinstall and realign the test equipment for each test in the prior art is avoided, so that the atomization particle size measurement and spray imaging results of the nozzle spray have good repeatability under a unified spatial reference, providing a more reliable basis for nozzle performance evaluation and test data analysis.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical measuring device for a nozzle test chamber, characterized in that: It includes a guide rail assembly (1), a camera (2), a light source (3), and a laser particle size analyzer (4); The guide rail assembly (1) includes a first guide rail (11) and two second guide rails (12), which are arranged parallel to each other and are used to be located on opposite sides of the nozzle test chamber. A first moving platform (5) for supporting the camera (2) is slidably disposed on the first guide rail (11); Each second guide rail (12) is slidably provided with a second moving platform (6) and a third moving platform (7). The second moving platform (6) is used to support the light source (3), and the light outlets of the light source (3) on the two second guide rails (12) are arranged opposite to each other to form an illumination area for spray imaging in the nozzle test chamber. The laser particle size analyzer (4) includes a transmitter (41) and a receiver (42), which are respectively mounted on different third moving platforms (7) to form laser beams that pass through the nozzle test chamber; The camera (2) is used to photograph the spray formed inside the nozzle test chamber under the illumination of the light source (3).

2. The optical measuring device for a nozzle test chamber according to claim 1, characterized in that: The bottom of the second guide rail (12) is provided with at least two support seats (8), which are used to adjust the height of the second guide rail (12) in the vertical direction and / or the posture in the horizontal direction; The laser particle size analyzer (4) is used to form a laser spot at the observation window (10) of the nozzle test chamber. The relative positional relationship between the laser spot and the center of the observation window (10) is used to provide a calibration basis for the height and / or attitude adjustment of the second guide rail (12).

3. The optical measuring device for a nozzle test chamber according to claim 2, characterized in that: The second mobile platform (6) and / or the third mobile platform (7) are provided with a locking component (9), which is used to lock the second mobile platform (6) and / or the third mobile platform (7) at a predetermined position on the second guide rail (12).

4. The optical measuring device for a nozzle test chamber according to claim 3, characterized in that: The second mobile platform (6) includes a moving block (61), a vertical support rod (62), and a horizontal support rod (63); The movable block (61) is slidably engaged with the second guide rail (12), the vertical support rod (62) is fixedly mounted on the movable block (61), and the horizontal support rod (63) is fixedly mounted at the end of the vertical support rod (62) away from the movable block (61). The light source (3) slides along the length of the transverse support rod (63) to adjust the position of the light source (3) relative to the second guide rail (12) in the transverse direction.

5. A test method for a nozzle test chamber, using the optical measuring device for a nozzle test chamber as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Under the condition that the working parameters of the nozzle test chamber are set and remain unchanged, the transmitting end (41) and receiving end (42) of the laser particle size analyzer (4) are respectively located at the observation window (10) opposite to each other in the nozzle test chamber. The atomized particle size of the nozzle spray is measured by passing the laser beam through the nozzle spray area. S2. After completing the atomized particle size measurement, move the laser particle size analyzer (4) along the guide rail assembly (1) so that the laser beam avoids the central area of ​​the observation window (10) of the nozzle test chamber. S3. Move the light source (3) along the guide rail assembly (1) so that the light source (3) is positioned opposite to the nozzle test chamber at the observation window (10) and form an illumination beam area that illuminates each other and intersects in the nozzle test chamber. S4. Within the illumination beam area, the nozzle spray is imaged and acquired by the camera (2) to obtain image information of the nozzle spray.

6. The test method for a nozzle test chamber according to claim 5, characterized in that: Before performing step S1, the following calibration steps are also included: By using the transmitter (41) and receiver (42) of the laser particle size analyzer (4) located at the observation window (10) of the nozzle test chamber, the laser beam emitted by the transmitter (41) leaves a laser spot when passing through the observation window (10), while the receiver (42) stably receives the laser signal. Based on the relative positional relationship between the laser spot and the center of the observation window (10), the height and / or attitude of the guide rail assembly (1) are adjusted so that the guide rail assembly (1) is in a predetermined spatial installation state, thereby completing the spatial calibration of the guide rail assembly (1) relative to the nozzle test chamber.

7. The test method for a nozzle test chamber according to claim 6, characterized in that: After the calibration step and before performing step S1, the following steps are also included: Using the geometric center marks of the 0° and 180° observation windows (10) of the nozzle test chamber as spatial references; by moving the transmitting end (41) and receiving end (42) of the laser particle size analyzer (4) along the guide rail assembly (1), the geometric center of the laser spot formed by the transmitting end (41) at the 0° and 180° observation windows (10) is aligned with the center mark of the corresponding observation window (10), and the position of the third moving platform (7) carrying the laser particle size analyzer (4) at this time is defined as the first measurement position; By moving the light source (3) along the guide rail assembly (1), the geometric center of the circular illumination spot formed by the light source (3) at the 0° and 180° observation windows (10) is aligned with the center mark of the corresponding observation window (10), and the position of the second moving platform (6) carrying the light source (3) at this time is defined as the second measurement position; In step S1, the third moving platform (7) is reset to the first measurement position; in step S3, the second moving platform (6) is reset to the second measurement position.

8. The test method for a nozzle test chamber according to claim 6, characterized in that: After completing the atomized particle size measurement in step S1, without changing the nozzle oil supply parameters and test chamber operating parameters, keep the nozzle in a continuous spray state, and execute steps S2 to S4 without interrupting the continuous spray state.

9. The test method for a nozzle test chamber according to claim 7, characterized in that: After completing the atomization characteristic test of steps S1 to S4, by keeping the first and second measurement positions unchanged, and without recalibrating the guide rail and establishing the axis, the nozzle oil supply parameters and / or the operating parameters in the nozzle test chamber are changed, and the atomization particle size measurement and spray imaging acquisition are repeatedly performed on the nozzle spray to obtain multiple sets of atomization characteristic data under the same measurement reference axis.

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