Visual aerosol measuring device

Abstract

An aerosol visualization measuring device comprises an aerosol generating component, a temperature field forming component and a measuring component, the aerosol generating component is communicated with the temperature field forming component and used for introducing generated aerosol into the temperature field forming component at a certain speed, the temperature field forming component is communicated with the temperature field forming component, and the measuring component is communicated with the temperature field forming component. The temperature field forming component is used for enabling the aerosol to form a stable vertical temperature gradient field, and the measuring component is used for acquiring a transmission image of the aerosol in the temperature field forming component and analyzing temperature field distribution and velocity field distribution of the aerosol according to the transmission image. According to the visual aerosol measuring device, the spatial distribution of the temperature field and the velocity field is synchronously obtained, the interference of a physical probe is avoided, the data is more real, the spatial distribution characteristics are better reflected, and the experimental research range of the aerosol in the fields of combustion optimization, industrial emission monitoring and the like is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of aerosol monitoring, and in particular to an aerosol visualization measuring device. Background Art

[0002] Aerosols are multiphase dispersions composed of solid or liquid particles (such as dust, smoke, water droplets, and pollen) suspended in a gas medium. Particle sizes typically range from 0.001 to 100 microns, and their shapes can range from spherical (fog droplets), flakes, needles, and irregular shapes. From a fluid mechanics perspective, aerosols consist of a gas as the continuous phase and solid / liquid particles as the dispersed phase. Their dynamic behavior is influenced by factors such as Brownian motion, gravitational sedimentation, and thermophoretic diffusion. In nuclear reactors, aerosols are important carriers of radioactive products, and measuring aerosol transport is crucial for safety assessments.

[0003] Currently, aerosol temperature and velocity field measurements rely primarily on intrusive single-point measurement technology. This method offers advantages such as fast response, high measurement accuracy, and simple data processing, and can meet the real-time monitoring needs of most experimental scenarios. However, its limitations are: (1) the intrusive probe destroys the original distribution of the aerosol flow field, causing the measurement results to deviate from the true state; and (2) it can only obtain information at discrete points, making it difficult to reflect the spatial distribution characteristics of the aerosol temperature and velocity fields. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an aerosol visualization measurement device that synchronously obtains the spatial distribution of temperature and velocity fields, avoids the interference of physical probes, and provides more realistic data, better reflects the spatial distribution characteristics, and expands the scope of experimental research on aerosols in the fields of combustion optimization and industrial emission monitoring.

[0005] The present invention provides an aerosol visualization measurement device, comprising an aerosol generating component, a temperature field forming component and a measuring component. The aerosol generating component is connected to the temperature field forming component and is used to pass the generated aerosol into the temperature field forming component at a certain speed. The temperature field forming component is used to make the aerosol form a stable vertical temperature gradient field. The measuring component is used to obtain a transmission image of the aerosol inside the temperature field forming component and analyze the temperature field distribution and velocity field distribution of the aerosol based on the transmission image.

[0006] In one embodiment, the temperature field forming component includes an experimental flow channel, a water bath structure and a transparent window. The water bath structure is assembled on the outer wall surface of the experimental flow channel. The transparent window is arranged on the experimental flow channel. The experimental flow channel is connected to the aerosol generating component. The position of the transparent window is opposite to the position of the measuring component.

[0007] In one embodiment, the water bath structure includes a first water bath wall tube, a first temperature control module, a second water bath wall tube and a second temperature control module. The first water bath wall tube and the second water bath wall tube are correspondingly assembled on the outer wall surface of the experimental flow channel. The first temperature control module and the second temperature control module respectively control the temperature inside the first water bath wall tube and the second water bath wall tube.

[0008] In one embodiment, the measuring component includes an illuminating lamp, a background plate, a spectroscope, a filter, a background camera, a particle camera and an algorithm module. The illuminating lamp illuminates the background plate, and the diffuse reflected light generated by the background plate is projected onto the spectroscope through a transparent window and aerosol. The spectroscope divides the projection into transmitted light and reflected light. The transmitted light and reflected light are collected by the background camera and the particle camera respectively after passing through the filter to obtain a background image and a particle scattering image. The algorithm module analyzes the background image and the particle scattering image to obtain the temperature field distribution and the velocity field distribution.

[0009] In one embodiment, the algorithm module includes:

[0010] A background schlieren algorithm submodule is used to analyze the background image to obtain the temperature field distribution;

[0011] The image velocity measurement algorithm submodule is used to analyze the particle scattering image to obtain the velocity field distribution.

[0012] In one embodiment, the filter includes a long-pass filter and a band-pass filter, and the long-pass filter and the band-pass filter are used to filter the transmitted light and the reflected light respectively.

[0013] In one embodiment, the aerosol generating component includes a nitrogen source end, a mass flow controller and an aerosol generator, the nitrogen source end is connected to the aerosol generator through the mass flow controller, and the aerosol generator is connected to the temperature field forming component.

[0014] The aerosol visualization measurement device provided by the present invention synchronously obtains the spatial distribution of temperature and velocity fields, avoiding the interference of physical probes. The data is more realistic and better reflects the spatial distribution characteristics, expanding the scope of experimental research on aerosols in fields such as combustion optimization and industrial emission monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is an assembly diagram of the aerosol generating component and the temperature field forming component of the aerosol visualization measurement device provided by the present invention.

[0017] Figure 2 This is a schematic structural diagram of the temperature field forming component of the aerosol visualization measurement device provided by the present invention.

[0018] Figure 3 Schematic diagram of the structure of the measuring component of the aerosol visualization measuring device provided by the present invention DETAILED DESCRIPTION

[0019] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, and not all, of the embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the description of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0020] In the description of the present invention, unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0021] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0022] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0023] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0024] See also Figure 1 and Figure 2The aerosol visualization measurement device provided by the present invention includes an aerosol generating component 1, a temperature field forming component 2 and a measuring component 3. The aerosol generating component 1 is connected to the temperature field forming component 2 and is used to pass the generated aerosol into the temperature field forming component 2 at a certain speed. The temperature field forming component 2 is used to make the aerosol form a stable vertical temperature gradient field. The measuring component 3 is used to obtain a transmission image of the aerosol inside the temperature field forming component 3, and analyze the temperature field distribution and velocity field distribution of the aerosol based on the image.

[0025] It can be understood that during the measurement process, the aerosol generating component will pass the generated aerosol into the temperature field forming component 2 at a certain speed. The temperature field forming component 2 will form the aerosol into a stable vertical temperature gradient field to simulate the state of the aerosol in various scenarios. The vertical temperature gradient field can be understood as the temperature of the aerosol inside the temperature field forming component increasing from bottom to top in the vertical direction. The measuring component 3 obtains a transmission image of the aerosol and analyzes the transmission image to obtain the temperature field distribution and velocity field distribution of the aerosol.

[0026] See also Figure 1 and Figure 2 In some embodiments, the temperature field forming component 2 includes an experimental flow channel 201, a water bath structure and a transparent window. The water bath structure is assembled on the outer wall of the experimental flow channel 201. The transparent window is set on the experimental flow channel 201. The experimental flow channel 201 is connected to the aerosol generating component 1, and the position of the transparent window is opposite to the position of the measuring component 3.

[0027] It can be understood that the experimental flow channel 201 can be a metal pipe with both ends blocked, and transparent windows are embedded in the metal pipe. The number of transparent windows can be two, and the transparent windows can be made of transparent insulating glass. The positions of the two transparent windows correspond to each other. The experimental flow channel 201 can also be connected to an exhaust pipe, and the exhaust pipe is equipped with a particle size spectrometer 104 and a filter 105. The particle size spectrometer 104 can measure the size of particles in the aerosol, and then the aerosol to be discharged is filtered and discharged through the filter 105. The water bath structure can be used to adjust the temperature field in the vertical direction of the aerosol in the experimental flow channel 201. Several thermocouple temperature sensors 206 can also be detachably installed inside the metal pipe. Before collection, the temperature at each height position in the metal pipe is measured to ensure that the water bath structure can meet the temperature regulation requirements.

[0028] Please continue reading Figure 1In some embodiments, the water bath structure includes a first water bath wall tube 203, a first temperature control module 202, a second water bath wall tube 205 and a second temperature control module 204. The first water bath wall tube 203 and the second water bath wall tube 205 are correspondingly assembled on the outer wall surface of the experimental flow channel 201. The first temperature control module 202 and the second temperature control module 204 respectively control the temperature inside the first water bath wall tube 203 and the second water bath wall tube 205.

[0029] It can be known that the first water bath wall tube 203 and the second water bath wall tube 205 can be rectangular metal water pipes, and the first water bath wall tube 203 and the second water bath wall tube 205 are respectively located at the upper and lower parts of the experimental flow channel 201, and the first temperature control module 202 and the second temperature control module 204 can both include a water bath, a liquid inlet pipe, a liquid outlet pipe, an electric heating pipe and a refrigeration component. The water bath is connected to the corresponding first water bath wall tube 203 and the second water bath wall tube 205 through the liquid inlet pipe and the liquid outlet pipe. The electric heating pipe and the refrigeration component are used to heat or cool the solution in the water bath. A circulating pump can be installed on the liquid inlet pipe for the flow circulation of the liquid between the water bath and the first water bath wall tube 203 and the second water bath wall tube 205. A temperature sensor can be set inside the water bath to measure the temperature inside the water bath.

[0030] See also Figure 3 In some embodiments, the measuring component 3 includes an illumination lamp, a background plate 301, a spectroscope 302, a filter, a background camera 304, a particle camera 306 and an algorithm module. The illumination lamp illuminates the background plate 301, and the diffuse reflected light generated by the background plate 301 is projected onto the spectroscope 302 through the transparent window and the aerosol. The spectroscope 302 divides the projection into transmitted light and reflected light. The transmitted light and the reflected light are collected by the background camera 304 and the particle camera 306 respectively after passing through the filter to obtain a background image and a particle scattering image. The algorithm module analyzes the background image and the particle scattering image to obtain the temperature field distribution and the velocity field distribution.

[0031] It is understandable that the lighting can be an LED lamp, which illuminates the background plate 301. The background plate 301 has a dot matrix pattern. The dot matrix pattern is a relatively uniform, dense, and irregularly distributed dot matrix generated in the form of random probability distribution. The LED lamp illuminates the background plate 301, and the LED lamp can be placed in front of the background plate 301, diagonally above or diagonally below, so that the LED lamp will not block the camera's field of view. The background plate is illuminated from the front, and the light is diffusely reflected from the background plate into the background camera 304 and the particle camera 306. The background plate 301 is facing one of the transparent windows on the side wall of the test flow channel 201. The background plate 301 and the transparent window are parallel to each other. The transparent window serves as the entrance for the background plate light 301 signal, ensuring that it is at the same height as the center point of the transparent window. The spectrometer 302 can be a semi-transparent and semi-reflective spectrometer; the position of the semi-transparent and semi-reflective spectrometer is parallel to the other transparent window. The transparent window is the outlet for the light signal of the background plate 301. The two transparent windows are parallel and aligned to ensure that their center points are at the same height as the transparent window. The side windows of the semi-transparent and semi-reflective spectrometer are parallel to the camera lens of the particle camera 306 in pairs to ensure that their center points are at the same height. The side windows of the semi-transparent and semi-reflective spectrometer are parallel to the camera lens of the particle camera 306 in pairs to ensure that their center points are at the same height. The particle camera 306, the spectrometer and the background camera 304 are arranged in an L-shape in a top view.

[0032] The particle camera 306 and background camera 304 both use Lavision V710L high-speed cameras with a maximum capture frequency of 1000 Hz and a CCD resolution of 1280 × 800 pixels. The laser light source uses Lavision's Laser 2018 dual-pulse laser, generating a 532 nm laser sheet with a maximum frequency of 1000 Hz.

[0033] Please continue reading Figure 3 In some embodiments, the filter includes a long-pass filter 303 and a band-pass filter 305 , and the long-pass filter 303 and the band-pass filter 305 are used to filter the transmitted light and the reflected light respectively.

[0034] It can be understood that the long-pass filter 303 is parallel to and aligned with the background camera 304, and the long-pass filter 303 can filter out particle scattering signals, and the band-pass filter 305 is parallel to and aligned with the particle camera 306, and the band-pass filter 305 can filter out background signals.

[0035] See also Figure 3 In some embodiments, the algorithm module includes:

[0036] Background Schlieren algorithm submodule (BOS), used to analyze the background image to obtain the temperature field distribution;

[0037] The image velocimetry algorithm submodule (PIV) is used to analyze the particle scattering image to obtain the velocity field distribution.

[0038] It is understandable that the above-mentioned algorithm submodules may be some commonly used algorithm modules in this field.

[0039] See also Figure 1 In some embodiments, the aerosol generating component 1 includes a nitrogen source end 101, a mass flow controller 102 and an aerosol generator 103. The nitrogen source end 101 is connected to the aerosol generator 103 through the mass flow controller 102, and the aerosol generator 102 is connected to the temperature field forming component 2.

[0040] It is understood that the aerosol carrier gas is provided by the nitrogen source 101. The carrier gas flows through the mass flow controller 102 via nitrogen to control the gas flow rate. The carrier gas flowing out of the mass flow controller 102 enters the aerosol generator 103 and carries the aerosol particles into the test flow channel.

[0041] From the above description, it can be seen that the aerosol visualization measurement device provided by the present invention synchronously obtains the spatial distribution of temperature and velocity fields, avoiding the interference of physical probes. The data is more realistic and better reflects the spatial distribution characteristics, expanding the scope of experimental research on aerosols in fields such as combustion optimization and industrial emission monitoring.

[0042] The foregoing description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein are intended to be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An aerosol visualization measurement device, characterized in that: It includes an aerosol generating component, a temperature field forming component and a measuring component. The aerosol generating component is connected to the temperature field forming component and is used to pass the generated aerosol into the temperature field forming component at a certain speed. The temperature field forming component is used to make the aerosol form a stable vertical temperature gradient field. The measuring component is used to obtain a transmission image of the aerosol inside the temperature field forming component and analyze the temperature field distribution and velocity field distribution of the aerosol based on the transmission image.

2. The aerosol visualization measuring device according to claim 1, characterized in that: The temperature field forming component includes an experimental flow channel, a water bath structure and a transparent window. The water bath structure is assembled on the outer wall surface of the experimental flow channel. The transparent window is arranged on the experimental flow channel. The experimental flow channel is connected to the aerosol generating component. The position of the transparent window is opposite to the position of the measuring component.

3. The aerosol visualization measurement device according to claim 2, characterized in that: The water bath structure includes a first water bath wall tube, a first temperature control module, a second water bath wall tube and a second temperature control module. The first water bath wall tube and the second water bath wall tube are correspondingly assembled on the outer wall surface of the experimental flow channel. The first temperature control module and the second temperature control module respectively control the temperature inside the first water bath wall tube and the second water bath wall tube.

4. The aerosol visualization measurement device according to claim 1, characterized in that: The measuring component includes an illuminating lamp, a background plate, a spectroscope, a filter, a background camera, a particle camera and an algorithm module. The illuminating lamp illuminates the background plate. The diffusely reflected light generated by the background plate is projected onto the spectroscope through a transparent window and aerosol. The spectroscope divides the projection into transmitted light and reflected light. The transmitted light and reflected light are respectively collected by the background camera and the particle camera after passing through the filter to obtain a background image and a particle scattering image. The algorithm module analyzes the background image and the particle scattering image to obtain a temperature field distribution and a velocity field distribution.

5. The aerosol visualization measurement device according to claim 4, characterized in that: The algorithm module includes: A background schlieren algorithm submodule is used to analyze the background image to obtain the temperature field distribution; The image velocity measurement algorithm submodule is used to analyze the particle scattering image to obtain the velocity field distribution.

6. The aerosol visualization measurement device according to claim 4, characterized in that: The filter includes a long-pass filter and a band-pass filter, and the long-pass filter and the band-pass filter are used to filter the transmitted light and the reflected light respectively.

7. The aerosol visualization measurement device according to claim 1, characterized in that: The aerosol generating component includes a nitrogen source end, a mass flow controller and an aerosol generator. The nitrogen source end is connected to the aerosol generator through the mass flow controller, and the aerosol generator is connected to the temperature field forming component.

Images