CN112924135B - Trace gas throwing method, tracer gas throwing device and trace system - Google Patents
Trace gas throwing method, tracer gas throwing device and trace system Download PDFInfo
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- CN112924135B CN112924135B CN202110238259.XA CN202110238259A CN112924135B CN 112924135 B CN112924135 B CN 112924135B CN 202110238259 A CN202110238259 A CN 202110238259A CN 112924135 B CN112924135 B CN 112924135B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
- G01M9/067—Measuring arrangements specially adapted for aerodynamic testing dealing with flow visualisation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The application relates to a tracer gas delivery method, a tracer gas delivery device and a tracer system, wherein the tracer gas delivery method comprises the following steps: treating the PLIF tracer with a tracer gas generating apparatus to form a tracer gas; introducing the tracer gas into the wind tunnel through the throwing device; the lee surface of the throwing device is provided with a plurality of air outlet holes; the controller obtains the main fluid flow rate of the wind tunnel and the image display result of the tracer gas introduced into the wind tunnel, and adjusts the throwing speed of the tracer gas according to the main fluid flow rate of the wind tunnel and the image display result of the tracer gas. According to the tracer putting method, PLIF tracer steam is used, so that visualization of a wind tunnel flow field can be realized; a plurality of air outlet holes are arranged on the leeward surface, so that a plurality of tracing lines can be formed, the visual range is enlarged, and more flow field information is acquired; and then according to the main fluid velocity of the wind tunnel and the image display result of the PLIF tracer introduced into the wind tunnel, the feeding speed of the PLIF tracer is adjusted, thereby being beneficial to improving the stability of the tracing effect.
Description
Technical Field
The application relates to the field of flow field visualization, in particular to a tracer gas delivery method, a tracer gas delivery device and a tracer system.
Background
In aerospace engineering, wind tunnel visualization experiments of specific aircraft models are the main experimental means for optimizing aerodynamic layout of aircraft. And analyzing and obtaining information such as flow field structure change, transition position and the like according to the obtained experimental data, and further evaluating the rationality of the pneumatic layout of the model.
The conventional low-speed flow field visualization technology is difficult to realize unsteady flow visualization due to poor tracking particle following performance. The Planar Laser Induced Fluorescence (PLIF) technology has excellent following property because the trace particles are gas molecules, and can be used for realizing the visualization of unsteady flow of the wind tunnel. However, in the traditional tracer gas feeding method, PLIF tracer gas is fed into a wind tunnel flow field through an aircraft model, only the fluid movement of a boundary layer closest to the model can be observed, and the movement condition of the fluid cannot be comprehensively reflected.
Therefore, the conventional tracer delivery method has the problem of insufficient information.
Disclosure of Invention
Based on the above, it is necessary to provide a tracer delivery method, a tracer delivery device and a tracer system capable of acquiring more flow field information.
In a first aspect of the present application, a tracer gas delivery method is provided, including:
treating the tracer with a tracer gas generating apparatus to form a tracer gas; the tracer is PLIF tracer;
introducing the trace gas into a wind tunnel through a throwing device; the lee surface of the throwing device is provided with a plurality of air outlet holes;
the controller obtains the main fluid flow rate of the wind tunnel and the image display result of the tracer gas introduced into the wind tunnel, and adjusts the throwing speed of the tracer gas according to the main fluid flow rate of the wind tunnel and the image display result of the tracer gas.
In one embodiment, the trace gas generating apparatus comprises a bubble tank, the treating the tracer with the trace generating apparatus to form a trace gas comprising:
the bubbling gas is introduced into the liquid tracer in the bubbling tank and mixed with the tracer vapor in the bubbling tank to form a tracer gas consisting of the bubbling gas and the tracer vapor.
In one embodiment, before introducing the bubbling gas into the liquid tracer in the bubbling tank, the method further comprises:
the flow rate of the introduced bubbling gas is controlled.
In one embodiment, after the trace gas is introduced into the wind tunnel through the delivery device, the method further comprises:
and calculating the feeding speed of the trace gas according to the number and the area of the air outlet holes and the flow of the bubbling gas.
In one embodiment, the delivering device is a steel pipe, and the introducing the trace gas into the wind tunnel through the delivering device includes:
introducing the tracer gas into the steel pipe through one end of the steel pipe; the other end of the steel pipe is closed, and a plurality of air outlet holes are formed in the steel pipe;
the tracer gas enters a wind tunnel through the air outlet hole in the steel pipe; the steel pipe is arranged at an air outlet of the wind tunnel, and the steel pipe is perpendicular to the airflow direction of the wind tunnel.
In one embodiment, the controller obtains a main fluid flow rate of the wind tunnel and an image display result of the tracer gas introduced into the wind tunnel, and adjusts a delivery speed of the tracer gas according to the main fluid flow rate of the wind tunnel and the image display result of the tracer gas, including:
the controller obtains the main fluid flow rate of the wind tunnel, and sets an initial value of the feeding speed of the trace gas according to the main fluid flow rate of the wind tunnel;
the controller obtains an image display result of the tracer gas led into the wind tunnel, and adjusts the throwing speed of the tracer gas according to a preset step distance according to the image display result of the tracer gas.
In a second aspect, the present application provides a trace gas delivery device, which is characterized by comprising trace gas generating equipment, delivery equipment and a controller; the tracer generating device is used for processing the tracer to form tracer gas; the tracer is PLIF tracer; the feeding device is connected with the tracer gas generating device, a lee surface of the feeding device is provided with a plurality of air outlets, and the feeding device is used for guiding the tracer gas into a wind tunnel; the controller is connected with the trace gas generating device and the main controller, and is used for acquiring the main fluid flow rate of the wind tunnel and the image display result of the trace gas led into the wind tunnel, and adjusting the throwing speed of the trace gas according to the main fluid flow rate and the image display result.
In one embodiment, the trace gas generating apparatus comprises a high pressure gas cylinder, a gas mass flow meter and a bubbling tank connected in sequence; the gas mass flowmeter is connected with the controller, and the bubbling tank is connected with the throwing device.
In one embodiment, the blister pot is placed in a constant temperature environment.
In a third aspect of the present application, a tracer system is provided, including a laser light source, a camera, a main controller, and a tracer gas delivery apparatus in any of the above embodiments; the laser light source is used for exciting the trace gas to enable the trace gas to radiate fluorescent signals to form a fluorescent image; the main controller is connected with the controller and is used for feeding back the main flow velocity of the wind tunnel and the image display result of the trace gas to the controller.
According to the tracer putting method, PLIF tracer steam is used, so that visualization of a wind tunnel flow field can be realized; a plurality of air outlet holes are arranged on the leeward surface, so that a plurality of tracing lines can be formed, the visual range is enlarged, and more flow field information is acquired; and then according to the main fluid velocity of the wind tunnel and the image display result of the PLIF tracer introduced into the wind tunnel, the feeding speed of the PLIF tracer is adjusted, thereby being beneficial to improving the stability of the tracing effect.
Drawings
FIG. 1 is a schematic flow diagram of a trace gas delivery method in one embodiment;
FIG. 2 is a schematic flow chart of a trace gas delivery method according to another embodiment;
FIG. 3 is a schematic flow diagram of an embodiment of introducing trace gas into a wind tunnel through a launch device;
FIG. 4 is a schematic view of the position of the delivery device in one embodiment;
FIG. 5 is a schematic flow chart of a controller in one embodiment for obtaining a main flow rate of a wind tunnel and an image display result of a tracer gas introduced into the wind tunnel, and adjusting a feeding speed of the tracer gas according to the main flow rate of the wind tunnel and the image display result of the tracer gas;
FIG. 6 is a block diagram of the trace gas delivery apparatus in one embodiment;
fig. 7 is a schematic diagram of a trace gas generating apparatus in one embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
According to the first aspect of the application, the trace gas throwing method is provided, and can be applied to research on the combustion process inside an aircraft engine in aerospace engineering, wind field visualization experiments of an aircraft model and detection and evaluation of indoor fresh air quantity indexes. In one embodiment, please refer to fig. 1, which includes steps S200 to S600.
Step S200: the tracer is treated using a tracer gas generating apparatus to form a tracer gas.
In particular, a tracer refers to a marker that is added to observe, study, and measure the behavior or properties of a substance during a given process. As a tracer, its properties or behaviour should be identical or very different from that of the substance to be shown in the process; the amount added should be small, have no significant effect on the system and must be easily detected. The tracer gas refers to a gas comprising a tracer. The tracer gas can be directly led into the flow field, or the tracer gas used for flow field measurement can be formed by using other methods of carrying the tracer gas with the tracer gas, and correspondingly, the tracer gas generating equipment can be a heating device or a bubbling device. In summary, the specific manner of generating the trace gas and the specific type of trace gas generating apparatus are not limited in this embodiment.
The tracer used in this application is PLIF (Planner Laser Induced Fluorescence, planar laser induced fluorescence technique) tracer. The PLIF tracer is a tracer that fluoresces under laser irradiation. Specifically, trace particles in the PLIF tracer are excited under irradiation of a laser. Electrons in the trace particles transition from the ground state to the excited state and return from the excited state to the ground state and fluoresce by spontaneous radiation. The parameter information of the flow field can be analyzed by using a camera to record the intensity and position distribution of fluorescence. Because fluorescence lifetime is nanosecond magnitude, the pixel of camera can reach millions, so PLIF's biggest characteristics are that it possess higher time resolution and spatial resolution. In addition, compared with other detection methods, PLIF is a non-contact measurement means, which can meet measurement requirements and ensure that the original state of a flow field is not interfered.
Step S400: the tracer gas is introduced into the wind tunnel through the delivery device.
Specifically, after the trace gas is generated by the trace gas generating device, the trace gas is led into the throwing device, and then the gas is led into the wind tunnel through the throwing device. The wind tunnel refers to a specific scene requiring a tracing experiment, and is not a wind tunnel in the traditional sense, but is a general name of a space with gas disturbance. For example, when the application scenario is a mine tunnel, "wind tunnel" refers to the mine tunnel; when the application scene is an indoor environment and is used for detecting the fresh air volume index, the wind tunnel refers to a gas flow channel from the outlet of the fresh air system.
Further, the lee surface of the throwing device is provided with a plurality of air outlet holes so as to ensure that the air outlet direction of the throwing device is consistent with the air flow direction of the main fluid. The tracer gas led in from the air outlet holes can form a plurality of tracer lines to more comprehensively reflect the airflow state of the wind tunnel.
Step S600: the controller obtains the main fluid flow rate of the wind tunnel and the image display result of the tracer gas introduced into the wind tunnel, and adjusts the throwing speed of the tracer gas according to the main fluid flow rate of the wind tunnel and the image display result of the tracer gas.
As described above, the PLIF tracer emits fluorescence under the irradiation of laser, and the intensity and position distribution of the fluorescence are recorded by using a camera, so that the parameter information of the flow field can be analyzed. Therefore, the image display result of the trace gas directly influences the accuracy of flow field analysis. The image display result of the trace gas comprises information related to image display quality, such as image display signal-to-noise ratio, image contrast and the like. The feeding speed of the trace gas is the speed for indicating the trace gas to be led into the wind tunnel.
Specifically, the main controller feeds back the image display results of the main fluid flow rate of the wind tunnel and the tracer gas to the controller, and the main controller adjusts the throwing speed of the tracer gas according to the image display results of the main fluid flow rate of the wind tunnel and the tracer gas, so that a better image display effect is achieved on the premise of not interfering with the original flow field state.
According to the tracer putting method, PLIF tracer steam is used, so that visualization of a wind tunnel flow field can be realized; a plurality of air outlet holes are arranged on the leeward surface, so that a plurality of tracing lines can be formed, the visual range is enlarged, and more flow field information is acquired; and then according to the main fluid velocity of the wind tunnel and the image display result of the PLIF tracer introduced into the wind tunnel, the feeding speed of the PLIF tracer is adjusted, thereby being beneficial to improving the stability of the tracing effect.
In one embodiment, the trace gas generating apparatus comprises a bubble tank, please refer to fig. 2, step S200 comprises step S220: the bubbling gas is introduced into the liquid tracer in the bubbling tank and mixed with the tracer vapor in the bubbling tank to form a tracer gas consisting of the bubbling gas and the tracer vapor.
In particular, most PLIF tracers are liquid at room temperature and if the liquid PLIF tracer is placed in a bubble tank, some of the liquid PLIF tracer evaporates to form PLIF tracer vapor. Injecting the sparging gas into the sparging tank at this time spares the liquid PLIF tracer and allows sufficient time and space for the sparging gas to mix with the PLIF tracer vapor in the sparging tank to form the tracer gas. And then the tracer gas is led into the wind tunnel by the throwing equipment. When the bubbling gas flow for bubbling is fixed and the tracer throwing device works for a long time, the reduction rate of PLIF tracer steam and the evaporation rate of liquid PLIF tracer, which are caused by the introduction of the tracer gas into the wind tunnel, reach dynamic balance, namely the concentration ratio of the bubbling gas and the PLIF tracer steam is fixed in the tracer gas thrown into the main flow field of the wind tunnel. It will be appreciated that the bubbled gas should be consistent with the gas in the wind tunnel flow field, or as consistent as possible, to reduce interference of other gas components in the tracer gas with the main flow field of the wind tunnel. For example, when the gas of the wind tunnel main flow field is air, air is used as the bubbling gas.
In the embodiment, the same gas as that in the wind tunnel main flow field is used as the bubbling gas, and the bubbling method is used for forming the trace gas consisting of the bubbling gas and the tracer steam, so that the interference of the trace gas on the wind tunnel main flow field is reduced.
In one embodiment, please continue with fig. 2, step S220 further includes step S210: the flow rate of the introduced bubbling gas is controlled. The flow rate of the bubbled gas reflects the flow rate of the bubbled gas into the liquid PLIF tracer per unit time, and thus determines the rate at which the tracer gas is introduced into the dispensing apparatus. If the speed limiting device is not arranged in the throwing equipment, the flow of the bubbling gas directly determines the speed of introducing the trace gas into the wind tunnel. Therefore, before injecting the bubbling gas into the liquid PLIF tracer, the flow rate of the bubbling gas is controlled, which is beneficial to effectively controlling the feeding speed of the tracer gas. The flow rate control device of the bubbling gas may be a flow meter or a pneumatic valve, and in summary, the specific type of the flow rate control device of the bubbling gas in this embodiment is not limited.
In one embodiment, please continue to refer to fig. 2, after step S400, further comprising step S500: and calculating the feeding speed of the tracer gas according to the number and the area of the air outlet holes and the flow of the bubbling gas.
As described above, if the dispensing device is not provided with the speed limiting device, the flow rate of the bubbling gas directly determines the speed at which the trace gas is introduced into the wind tunnel. In this case, the controller may calculate the delivery rate of the trace gas according to a preset formula. Specifically, the calculation formula of the trace gas delivery speed V is:
V=kC/Ns
wherein V is the feeding speed of the trace gas, and the unit is m/s; c is bubbling gas flow, unit m 3 S; n is the number of the air outlet holes; s is the area of each air outlet hole, and the unit is m 2 . Where k is a constant and is related to the proportion of tracer vapor in the tracer gas, where k is approximately 1 when the tracer vapor content in the tracer gas is small.
In the above embodiment, after the tracer gas is introduced into the wind tunnel, the tracer gas delivery speed is calculated according to the preset formula and the specific parameters of the tracer delivery device, so that the control according to the current delivery speed is facilitated.
In one embodiment, the throwing apparatus is a steel pipe, please refer to fig. 3, and step S400 includes step S420 and step S440.
Step S420: the tracer gas is led into the steel pipe through one end of the steel pipe, the other end of the steel pipe is closed, and a plurality of air outlet holes are formed in the steel pipe.
Step S440: the tracer gas enters the wind tunnel through the air outlet hole in the steel pipe.
Specifically, as shown in fig. 4, the steel pipe is disposed at an air outlet of the wind tunnel and is perpendicular to the airflow direction of the wind tunnel. One end of the steel pipe is connected with trace gas generating equipment, and the other end is closed. The leeward surface of the steel pipe is provided with a plurality of air outlet holes, and trace gas is led into the steel pipe from the trace gas sending equipment and then enters the wind tunnel from the air outlet holes. The central connecting line of the air outlet holes is perpendicular to the air flow direction of the wind tunnel, and trace gas moves along the air flow direction of the wind tunnel along with main fluid in the wind tunnel after entering the wind tunnel from the air outlet holes, so that a plurality of trace lines can be formed. Furthermore, a fixing device can be arranged on the steel pipe, so that the steel pipe can be conveniently fixed on the wind tunnel outer frame.
In one embodiment, the steel tube has an inner diameter of 4mm and an outer diameter of 6mm, and the leeward side is provided with an air outlet hole with a diameter of 1mm at intervals of 5 cm. The outer surface of the steel pipe is polished, so that boundary layer separation and turbulence phenomenon can not occur when the wind tunnel main fluid bypasses the steel pipe. It will be appreciated that the diameter of the steel pipe may be further reduced so that the main fluid in the wind tunnel is still laminar after flowing through the steel pipe, thereby reducing the influence of the steel pipe on the main fluid in the wind tunnel. Furthermore, the cross section of the steel pipe can be designed into an airfoil shape according to an aerodynamic principle, so that the influence of the steel pipe on the main flow field of the wind tunnel is reduced.
In one embodiment, referring to fig. 5, step S600 includes step S620 and step S640.
Step S620: the controller obtains the main flow velocity of the wind tunnel, and sets the initial value of the feeding speed of the tracer gas according to the main flow velocity of the wind tunnel.
As described above, the main fluid flow rate of the wind tunnel is fed back to the controller by the main controller, and the controller sets an initial value of the feeding speed of the tracer gas according to the main fluid flow rate of the wind tunnel, so that the difference between the initial value of the feeding speed of the tracer gas and the main fluid flow rate of the wind tunnel is lower than a preset threshold. Further, the delivery speed of the tracer gas can be set to be consistent with the flow rate of the main fluid of the wind tunnel so as to reduce disturbance of the main fluid of the wind tunnel by the tracer gas.
Step S640: the controller obtains an image display result of the tracer gas led into the wind tunnel, and adjusts the throwing speed of the tracer gas according to a preset step distance according to the image display result of the tracer gas.
The controller is fed back with image display results of the trace gas introduced into the wind tunnel, including but not limited to image signal to noise ratio. When the signal-to-noise ratio of the image is too low to be beneficial to subsequent analysis, the throwing speed can be gradually increased until the requirement of the signal-to-noise ratio of the image is met. When the content of the tracer steam in the tracer gas is too low to cause poor image display effect, the throwing speed and parameters of the tracer gas generating device can be properly adjusted so as to increase the content of the tracer steam in the tracer gas and achieve the required image display effect. It can be understood that the above adjustment of the trace gas delivery speed means that the trace gas is adjusted within a certain threshold range, and the trace gas is delivered within the threshold range, so that the influence on the main fluid of the wind tunnel is small.
In the above embodiment, the initial feeding speed of the tracer gas is set according to the speed of the main fluid of the wind tunnel, and then the feeding speed of the tracer gas is finely adjusted according to the image display result of the tracer gas led into the wind tunnel, so that a stable tracer effect can be maintained on the premise that the main fluid of the wind tunnel is not disturbed.
It should be understood that, although the steps in the flowcharts referred to in the above embodiments are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts referred to in the above embodiments may include a plurality of sub-steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of execution of the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with at least some of the other steps or sub-steps of other steps.
In a second aspect of the present application, referring to fig. 6, a trace gas delivery apparatus is provided, including a trace gas generating device 200, a delivery device 400, and a controller 600. Wherein the tracer generating apparatus 200 is configured to process a tracer, which is a PLIF tracer, to form a tracer gas; the dispensing device 400 is connected with the tracer gas generating device 200, a plurality of air outlets are arranged on the leeward side of the dispensing device 400, and the dispensing device 400 is used for guiding the tracer gas into the wind tunnel; the controller 600 is connected to the trace gas generating apparatus 200 and the main controller, and is configured to obtain a main fluid flow rate of the wind tunnel and an image display result of the trace gas introduced into the wind tunnel, and adjust a feeding speed of the trace gas according to the main fluid flow rate of the wind tunnel and the image display result of the trace gas introduced into the wind tunnel.
For specific limitations of the trace gas delivery device, please refer to the above limitations of the trace gas delivery method, and details thereof are not repeated here.
In one embodiment, referring to fig. 7, a trace gas generating apparatus 200 includes a high pressure gas cylinder 201, a gas mass flow meter 202, and a bubbling tank 203 connected in sequence; the gas mass flow meter 202 is connected to a controller 600 and the bubbling tank 203 is connected to the delivery device 400.
Wherein, above-mentioned each equipment uses the air duct to connect, and the junction is provided with sealing washer and valve, can prevent gas leakage. Specifically, the bubbling gas in the high-pressure gas cylinder 201 passes through the gas mass flow meter 202 and then reaches the bubbling tank 203. The bubbling gas is directly introduced into the tracer liquid in the bubbling tank 203, which can accelerate the evaporation rate of the tracer liquid. The bubbling gas is mixed with the tracer vapor in the bubbling tank 203 to form a tracer gas composed of the bubbling gas and the tracer vapor, and the tracer gas is introduced into the delivery apparatus 400 through the gas guide pipe, and then the tracer gas is introduced into the wind tunnel through the delivery apparatus 400. The gas mass flowmeter 202 is used for controlling the flow rate of bubbling gas in the high-pressure gas cylinder 201 so as to achieve the purpose of controlling the feeding speed of the trace gas.
Further, in one embodiment, the bubble tank 203 is placed in a constant temperature environment. The constant temperature environment can be realized by a constant temperature water bath 204; a temperature control device may be disposed on the side wall of the bubbling tank 203, and the temperature control device is connected to the controller 600, and is implemented by feedback control of the controller 600 according to the temperature collected by the temperature control device. In summary, the specific implementation manner of the constant temperature environment is not limited in this embodiment. The bubbling tank 203 is placed in a constant temperature environment, so that the temperature in the bubbling tank 203 can be kept unchanged, the evaporation rate of the liquid tracer in the bubbling tank 203 can be kept constant, the proportion of the tracer steam in the tracer gas can be kept stable in a short time, and the stability of the tracing effect can be improved.
In a third aspect of the present application, a tracer system is provided, including a laser light source, a main controller, and a tracer gas delivery apparatus in any of the above embodiments. The laser light source is used for exciting the trace gas to enable the trace gas to radiate fluorescent signals to form a fluorescent image; the main controller is connected with the controller and is used for feeding back the main fluid flow rate of the wind tunnel and the image display result of the trace gas to the controller.
The laser light source comprises a tunable laser and a light beam transmission device, wherein the light beam transmission device comprises a cylindrical lens, a collimating lens, a condensing lens and the like. Specifically, laser emitted by the tunable laser is expanded and collimated into a planar sheet-shaped beam meeting the requirements through the beam transmission device, PLIF tracer particles in the tracer gas are irradiated, and corresponding electrons in the tracer particles are excited to transition from a ground state to an excited state. Electrons in the excited state return from the excited state to the ground state by spontaneous emission and fluoresce, forming a fluorescent image. The intensity and position distribution of fluorescence in the fluorescence image are recorded by using a camera, so that the information of the relevant parameters such as concentration, temperature, speed and the like in the flow field can be analyzed. Further, in one embodiment, the camera is a camera with image enhancement, which is beneficial to improving the image effect of the PLIF tracer.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (8)
1. A tracer gas delivery method comprising:
introducing a bubbling gas into a liquid tracer in a bubbling tank, and mixing with tracer vapor in the bubbling tank to form a tracer gas consisting of the bubbling gas and the tracer vapor; the tracer is PLIF tracer;
introducing the trace gas into a wind tunnel through a throwing device; the lee surface of the throwing device is provided with a plurality of air outlet holes; the bubbling gas is consistent with the gas in the flow field of the wind tunnel;
the controller obtains the main fluid flow rate of the wind tunnel and sets the main fluid flow rate as an initial value of the throwing speed;
the controller acquires an image display result of the tracer gas led into the wind tunnel, and adjusts the throwing speed of the tracer gas by controlling the flow of the bubbling gas according to the image display result of the tracer gas;
the calculation formula of the feeding speed of the trace gas is as follows:
V=kC/Ns
v is the feeding speed of the trace gas, and the unit is m/s; c is the flow rate of the bubbling gas, and the unit is m 3 S; n is the number of the air outlet holes; s is the area of each air outlet hole, and the unit is m 2 The method comprises the steps of carrying out a first treatment on the surface of the k is a constant.
2. The tracer gas delivery method according to claim 1, wherein the image display results include: image display signal to noise ratio and image display contrast.
3. The tracer gas delivery method according to claim 1, wherein the delivery apparatus is a steel pipe, and the introducing the tracer gas into the wind tunnel through the delivery apparatus comprises:
introducing the tracer gas into the steel pipe through one end of the steel pipe; the other end of the steel pipe is closed, and a plurality of air outlet holes are formed in the steel pipe;
the tracer gas enters a wind tunnel through the air outlet hole in the steel pipe; the steel pipe is arranged at an air outlet of the wind tunnel, and the steel pipe is perpendicular to the airflow direction of the wind tunnel.
4. The trace gas delivery method according to claim 1, wherein said adjusting the delivery rate of the trace gas by controlling the flow rate of the bubbling gas comprises:
and adjusting the throwing speed of the trace gas by controlling the flow of the bubbling gas according to a preset step distance.
5. The tracer gas throwing device is characterized by comprising tracer gas generating equipment, throwing equipment and a controller; the tracer gas generating device is used for guiding the bubbling gas into the liquid tracer in the bubbling tank and mixing the liquid tracer with the tracer steam in the bubbling tank to form a tracer gas composed of the bubbling gas and the tracer steam; the tracer is PLIF tracer; the feeding device is connected with the trace gas generating device, a leeward surface of the feeding device is provided with a plurality of air outlets, and the feeding device is used for guiding the trace gas into a wind tunnel; the bubbling gas is consistent with the gas in the flow field of the wind tunnel; the controller is connected with the trace gas generating equipment and the main controller, and is used for acquiring the main fluid flow rate of the wind tunnel, setting the main fluid flow rate as an initial value of the throwing speed, acquiring an image display result of the trace gas led into the wind tunnel, and adjusting the throwing speed of the trace gas by controlling the flow of the bubbling gas according to the main fluid flow rate and the image display result; the calculation formula of the feeding speed of the trace gas is as follows:
V=kC/Ns
v is the feeding speed of the trace gas, and the unit is m/s; c is the flow rate of the bubbling gas, and the unit is m 3 S; n is the number of the air outlet holes; s is the area of each air outlet hole, and the unit is m 2 The method comprises the steps of carrying out a first treatment on the surface of the k is a constant.
6. The trace gas delivery apparatus according to claim 5, wherein the trace gas generating means comprises a high pressure gas cylinder, a gas mass flow meter and a bubbling tank connected in sequence; the gas mass flowmeter is connected with the controller, and the bubbling tank is connected with the throwing device.
7. A trace gas delivery apparatus according to claim 6, wherein the bubbling tank is placed in a constant temperature environment.
8. A tracer system comprising a laser light source, a camera, a master controller and a tracer gas delivery apparatus as claimed in any one of claims 5 to 7; the laser light source is used for exciting the trace gas to enable the trace gas to radiate fluorescent signals to form a fluorescent image; the main controller is connected with the controller and is used for feeding back the main flow velocity of the wind tunnel and the image display result of the trace gas to the controller.
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