CN111175049A - Diagnosis system and method for multidimensional temperature and concentration field of engine combustion chamber - Google Patents
Diagnosis system and method for multidimensional temperature and concentration field of engine combustion chamber Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The embodiment of the invention relates to a system and a method for diagnosing multidimensional temperature and concentration fields of an engine combustion chamber, which comprises the following steps: the device comprises a light source module, an acquisition module and a processing module, wherein the light source module and the acquisition module are oppositely arranged around an engine combustion chamber; the light source module is used for emitting a plurality of groups of laser beams into the engine combustion chamber, the laser beams are used for forming a grid plane in the engine combustion chamber, the collection module converts the collected laser beams into voltage signals and sends the voltage signals to the processing module, and the processing module is used for analyzing the voltage signals to determine the two-dimensional temperature and the concentration field of the grid plane. Therefore, the measurement of the dynamic two-dimensional temperature field and the concentration field of high-time and high-space resolution can be realized, and meanwhile, the measurement results of the three-dimensional temperature field and the concentration field of the combustion chamber of the engine can be obtained by combining the displacement module.
Description
Technical Field
The embodiment of the invention relates to the field of measurement of temperature and concentration fields of an engine combustion chamber, in particular to a system and a method for diagnosing multidimensional temperature and concentration fields of the engine combustion chamber.
Background
The accurate diagnosis of the two-dimensional dynamic distribution of the flame temperature and the concentration of the engine combustion chamber has important significance for the research of engine combustion mechanism, thermoacoustic oscillation, form transformation and the like. Due to the complex flow field environment in the engine combustion chamber, it is very difficult to accurately diagnose the two-dimensional dynamic temperature and concentration field of flame in the engine combustion chamber, for example, for an aircraft engine, a swirl and backflow flow field structure exists in the combustion chamber, and particularly, swirl flame is burnt in a high-temperature turbulent flow mode in a combustion state; in the case of a super-combustion engine, a large density and temperature gradient exist in the combustion chamber, and in addition, the interference of the shock wave exists. The conventional contact measurement methods such as thermocouples, total temperature probes, heat flow sensors and other diagnosis methods cannot meet the research requirements in the fields, and reliable and effective non-contact measurement technologies need to be developed.
At present, the main non-invasive measurement methods include ultrasonic tomography, electrical tomography, planar laser induced fluorescence, tunable diode laser absorption spectrum and the like. Ultrasonic tomography and electrical tomography are mainly applied to the testing of incompressible consistent solid or liquid temperature fields, the ultrasonic tomography measures the propagation speed of ultrasonic waves, calculates the temperature distribution by combining tomography according to the correlation between the ultrasonic tomography and the temperature, the electrical tomography measures the dielectric constant distribution of a target area, and obtains the temperature value of the target area by calibrating the dielectric constant and temperature coefficients in advance. The planar laser induced fluorescence utilizes fluorescence emitted by specific molecules through stimulation to detect a temperature field, is mainly used for measuring steady flame, is mainly used for qualitative analysis of an engine combustion field with violently changed pressure and temperature, and is extremely difficult to obtain an accurate quantitative result.
Tunable Diode Laser Absorption Spectroscopy (TDLAS) includes a counter combustion fieldThe method has the advantages of real-time quantitative diagnosis capability of multiple parameters (temperature and component concentration) and no interference to a flow field, and is a development hotspot in the field of combustion diagnosis in the world at present. The TDLAS technique is an integral measurement along the optical path, that is, an average value along the optical path is obtained, which cannot reflect the actual flow field state with large temperature gradient and concentration gradient, and the two-dimensional section distribution characteristics of the gas flow parameters are more meaningful for researching the combustion organization and heat release distribution of the engine. TDLAS combined with Computed Tomography (Computed Tomography) is a main technical approach (generally called TDLAT, Tunable Diode Laser Absorption Tomography) for improving the spatial resolution capability of TDLAS and realizing two-dimensional cross-section measurement. According to the specific implementation of tomography, TDLAT can be further divided into: optimizing a non-orthogonal optical path + dual wavelength/single wavelength; rotating the fan beam/parallel beam + dual wavelength; orthogonal light path + multispectral light source. The optimized non-orthogonal light path and double-wavelength/single-wavelength measurement light path needs a plurality of projection angles, for a real engine test environment, the light path erection space is insufficient, a wall surface window is in a defect, the complexity of the measurement system is greatly increased by the plurality of projection angles, and the scheme is not applied to the measurement results of a real engine combustion chamber temperature field and a real engine combustion chamber concentration field at present and is mainly applied to a laboratory open environment. Rotating fan beam/parallel beam + dual wavelength, which is generally achieved by rotating the laboratory table or rotating the light source, increases the complexity of the apparatus, while the time resolution is related to the rotation frequency, making it difficult to achieve high time resolution requirements above kilohertz. The orthogonal light path + multispectral light source technology experiment system is relatively simple, particularly, the orthogonal light path arrangement enables the TDLAT to only need two mutually perpendicular projection angles, and the smaller projection angle means that the orthogonal light path + multispectral light source technology experiment system is easier to apply to actual measurement environments and higher measurement speed. A very representative work was "50-kHz-rate 2D imaging of temperature and H published by Lin Ma in 20132The method comprises the following steps of O-centering and extra-position plane of a J85 engine using hyperspectral tomogry, OpticsExpress,21(1),1152-1162 ″, and the method adopts a 15 × 15 orthogonal light path arrangement to realize quantitative measurement of a two-dimensional dynamic temperature field and a water vapor concentration field at an outlet of a J85 aircraft engine, but the method has the following problems: 1) the multispectral light source adopts FourierThe inner-leaf mode-locked fiber laser can realize the sweeping of the wavelength range of about 30nm under the frequency of 50kHz, but the laser is expensive and immature in technology, for example, the wavelength stability and the linearity of the laser are poorer than those of a DFB laser; 2) due to the limitation of high frequency and scanning range of a light source, the low-energy level energy distribution of the selectable spectral line of the TDLAT system is not wide enough, and the original signal-to-noise ratio of absorption data is weaker than that of the TDLAT technology based on the DFB laser due to the matching problem of hardware parameters such as response of a recoupling detector, sampling frequency and the like; 3) due to the development level of the previous optical devices, the orthogonal optical structure of Lin Ma has a gap between adjacent laser beams of 38.3mm, and the spatial resolution capability is difficult to meet for a smaller-sized engine.
Disclosure of Invention
The embodiment of the invention provides a system and a method for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber, which can realize the measurement of a dynamic two-dimensional temperature field and a concentration field with high time and space resolution, and can obtain the measurement results of the three-dimensional temperature and concentration field of the engine combustion chamber by combining a displacement module.
In a first aspect, an embodiment of the present application provides a system for diagnosing a multidimensional temperature and concentration field of a combustion chamber of an engine, including: the device comprises a light source module, an acquisition module and a processing module, wherein the light source module and the acquisition module are oppositely arranged on the same horizontal plane of an engine combustion chamber;
the light source module is used for emitting a plurality of groups of laser beams into the engine combustion chamber, the laser beams are used for forming a grid plane in the engine combustion chamber, the collected laser beams are converted into voltage signals through the collecting module, the voltage signals are sent to the processing module, and the processing module is used for analyzing the voltage signals to determine the two-dimensional temperature and the concentration field of the grid plane.
In one possible embodiment, the light source module includes: the device comprises a multispectral light source, an optical fiber beam splitter and a self-focusing collimating lens;
the multispectral light source couples and divides a light path into a plurality of light beams through the optical fiber beam splitter, and transmits the coupled light beams to the same number of self-focusing collimating lenses, wherein the self-focusing collimating lenses are arranged on a first side surface and a second side surface of the engine combustion chamber at equal intervals, and the first side surface is perpendicular to the second side surface.
In one possible embodiment, the acquisition module comprises: a self-focusing coupling lens and a photodetector;
the self-focusing coupling lens is arranged corresponding to the self-focusing collimating lens, is connected with the photoelectric detector and is used for sending the collected laser beams to the photoelectric detector to be converted into voltage signals.
In one possible embodiment, the processing module comprises: a high-speed data acquisition instrument and a control and data processor;
the high-speed data acquisition instrument is used for recording the voltage signal, sending the voltage signal to the control and data processor for analysis, and determining the two-dimensional temperature and concentration field of the engine combustion chamber;
the control and data processing module is also used for controlling the light source module.
In one possible embodiment, the system further comprises: and the displacement module is used for carrying the self-focusing collimating lens and the self-focusing coupling lens, controlling the self-focusing collimating lens and the self-focusing coupling lens to move in the vertical direction through the displacement module, and measuring the three-dimensional temperature and concentration field of the engine combustion chamber.
In a second aspect, the present application provides a method for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber, where the system for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber is adopted, and the method includes:
adopting a light source module to emit laser beams to an engine combustion chamber, wherein the laser beams form a grid plane in the engine combustion chamber;
collecting the laser beam by adopting a collection module based on the grid plane, and converting the laser beam into a first voltage signal;
and analyzing the first voltage signal by adopting a processing module to determine the two-dimensional temperature and concentration field of the grid plane.
In one possible embodiment, the analyzing the first voltage signal by the processing module to determine the two-dimensional temperature and concentration field of the grid plane includes:
acquiring multispectral absorption data according to the voltage signal;
determining the absorptivity distribution of each laser beam according to the multispectral absorption data;
establishing a target optimization function of two-dimensional temperature and concentration fields according to the absorptivity distribution;
and inverting the target optimization function to obtain a two-dimensional temperature and concentration field of the engine combustion chamber.
In one possible embodiment, the establishing the target optimization function of the two-dimensional temperature and concentration field according to the absorbance distribution includes:
acquiring a preset temperature matrix and an absorption component concentration matrix;
obtaining preset absorptivity distribution according to the temperature matrix and the absorption component matrix;
and calculating the difference value of the absorptivity distribution and a preset absorptivity distribution, and establishing the target optimization function according to the difference value.
In a possible embodiment, the inverting the objective optimization function to obtain the two-dimensional temperature and concentration field of the grid plane includes:
acquiring temperature smoothness and absorption component partial pressure smoothness;
and inverting the target optimization function according to the temperature smoothness and the absorbed component partial pressure smoothness, and obtaining a two-dimensional temperature and concentration field of the grid plane when the difference value between the absorptivity distribution and a preset absorptivity distribution reaches a preset condition.
In one possible embodiment, the method further comprises:
the displacement module is adopted to control the light source module and the acquisition module to move in the vertical direction;
collecting laser beams of a plurality of grid planes by using the collection module, and converting the laser beams of the plurality of grid planes into second voltage signals;
and analyzing the second voltage signal by adopting a processing module to determine the three-dimensional temperature and concentration field of the engine combustion chamber.
The diagnosis system and the method for the multidimensional temperature and concentration field of the engine combustion chamber provided by the embodiment of the invention adopt the multispectral light source tomography technical scheme, and n (n is more than or equal to 4) absorption spectral lines are arranged on a single light path, so that the orthogonal light path arrangement with the minimum projection angle can be realized, and the measurement field of the real engine combustion chamber is easier to realize, namely, the diagnosis system and the method have higher practicability.
Compared with a Fourier mode-locked fiber laser, the multispectral light source prepared based on n (n is more than or equal to 4) DFB lasers through time-sharing coupling is lower in price; the low-level energy distribution of the absorption spectral line is wide enough and can be flexibly adjusted according to actual requirements (the low-level energy distribution determines the temperature measurement sensitivity), and the corresponding laser is replaced; the stability and the linearity are more excellent, and the matched detector, the acquisition and data processing module are more mature, so that the original signal-to-noise ratio is improved;
the orthogonal light path transmitting and receiving ends respectively adopt a self-focusing collimating lens and a self-focusing coupling lens, the two lenses are cylindrical structures, and the diameters of the two lenses are not more than 2.5mm, so that the optical structure of the engine combustion chamber is miniaturized while the collimation degree and the coupling efficiency of the measuring light path are ensured, the distance between adjacent light beams is effectively reduced to 4mm, and the spatial resolution is greatly improved (the spatial resolution of the system is the highest level of the orthogonal laser absorption spectrum in the current international combustion diagnosis field).
The self-focusing coupling lens designed by the invention has an end face coupling characteristic, namely, transmission laser is converged and imaged on the end face of the multimode fiber, the coupling efficiency of the laser and the multimode fiber can be effectively improved, the transmittance is over 90 percent in the wavelength range of 380-2000nm, the effective light passing diameter is 70 percent of the diameter of the lens, the effect of a diaphragm is achieved while the light passing efficiency is ensured, namely, the self-focusing coupling lens has the functions of filtering stray light and the luminous influence of combustion flame, and the signal-to-noise ratio of an original signal is effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a system for diagnosing a multidimensional temperature and concentration field of a combustion chamber of an engine according to an embodiment of the present disclosure;
FIG. 2 is a schematic perspective view of a system for diagnosing a multidimensional temperature and concentration field of a combustion chamber of an engine according to an embodiment of the present disclosure;
FIG. 3 is a 21 × 21 orthogonal optical path laser networking photo provided in the embodiment of the present application (adjacent lasers are spaced by 4mm)
FIG. 4 is a flowchart of a method for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber according to an embodiment of the present disclosure;
FIG. 5 is a reconstruction result of six cross-sectional temperature fields of 8mm,14mm,20mm,26mm,32mm and 38mm for the combustion chamber provided by the embodiment of the application;
FIG. 6 is a reconstruction result of a three-dimensional temperature field of a combustion chamber provided in an embodiment of the present application;
FIG. 7 shows the results of the reconstruction of the concentrations of the three-dimensional absorbing components in the combustion chamber according to the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, technical methods in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components in a certain posture, the motion situation, etc., and if the certain posture is changed, the directional indications are changed accordingly.
The embodiment of the application provides a diagnostic system of multidimensional temperature and concentration field of an engine combustion chamber, which comprises: the device comprises a light source module, an acquisition module and a processing module, wherein the light source module and the acquisition module are oppositely arranged on the same horizontal plane of an engine combustion chamber; the light source module is used for emitting a plurality of groups of laser beams into the engine combustion chamber, forming a grid plane (refer to fig. 3) in the engine combustion chamber through the laser beams, converting the collected laser beams into voltage signals through the collecting module, and sending the voltage signals to the processing module, wherein the processing module is used for analyzing the voltage signals to determine the two-dimensional temperature and the concentration field of the grid plane.
As shown in fig. 1, the light source module in the present embodiment includes: the device comprises a multispectral light source 1, an optical fiber beam splitter 2 and a self-focusing collimating lens 3; the multispectral light source 1 couples a light path through the optical fiber beam splitter 2 and divides the light path into a plurality of laser beams, the coupled laser beams are transmitted to the same number of self-focusing collimating lenses 3, the self-focusing collimating lenses 3 are arranged on a first side surface and a second side surface of an engine combustion chamber at equal intervals, and the first side surface is perpendicular to the second side surface.
Specifically, the multispectral light source 1 is constructed by using n (n is more than or equal to 4) DFB semiconductor lasers in time-sharing coupling, and the modulation frequency of a single laser is not lower than 2 multiplied by n kHz, so that the frequency of the multispectral light source 1 after time-sharing coupling is not lower than 2 kHz. The optical fiber beam splitter 2 couples and divides N paths of laser into N + M laser beams which are distributed in an orthogonal mode, and each laser beam after light splitting comprises N paths of laser signals. The self-focusing collimating lens 3 is arranged at the head of each light beam to realize focusing collimation of the output laser, is cylindrical and has the diameter not larger than 2.5 mm.
As shown in fig. 1, the acquisition module in this embodiment includes: the self-focusing coupling lens 4 is connected with the photoelectric detector 5 and used for transmitting the collected laser beams to the photoelectric detector 5 to be converted into voltage signals.
The self-focusing coupling lens 4 has an end face coupling characteristic, realizes convergence of incident laser on the end face of the multimode fiber, can effectively improve the coupling efficiency of the laser and the multimode fiber, has the transmittance of more than 90 percent in the wavelength range of 380-2000nm, has an effective light passing diameter of 70 percent of the diameter of the lens, plays a role of a diaphragm while ensuring the light passing efficiency, and has the functions of filtering stray light and the influence of combustion flame luminescence. The lenses of the auto-focusing collimating lens 3 and the auto-focusing coupling lens 4 in this embodiment are aligned with the optical window 10 disposed in the engine combustion chamber 9.
In this embodiment, the engine combustion chamber is a real engine component or a complete machine that uses hydrogen or hydrocarbon fuel and generates power by burning and releasing heat, and the engine 10 may be an aircraft engine, a super-combustion engine, a rocket engine, or the like, or may be a model combustor for conducting combustion research.
The self-focusing coupling lens 4 in the embodiment is cylindrical, the diameter of the self-focusing coupling lens is not larger than 2.5mm, and the self-focusing coupling lens is used in cooperation with the self-focusing collimating lens 3, so that the optical measurement structure is compact, and the adjacent laser beam gap is effectively reduced, so that the spatial resolution is improved (the system realizes the adjacent laser beam distance of 4mm, and is the highest level of the orthogonal laser absorption spectrum in the current international combustion diagnosis field).
The photoelectric detector 5 in this embodiment is an indium gallium arsenic photoelectric detector, and has an applicable wavelength range of 800-2600nm and a fixed gain or an adjustable gain.
As shown in fig. 1, the processing module in this embodiment includes: a high-speed data acquisition instrument 6 and a control and data processor 7; the high-speed data acquisition instrument 6 is used for recording voltage signals, sending the voltage signals to the control and data processor 7 for analysis, and determining the two-dimensional temperature and concentration field of the grid plane; the control and data processor 7 is also used to control the light source module.
The number of channels of the high-speed data acquisition instrument 6 is more than N + M, and all the channels can simultaneously realize the maximum sampling rate of 100 MS/s.
The control and data processing module 7 is a general name of a computer and analysis software, and the analysis software can be compiled based on C, C + +, Fortran, LabVIEW or PLC development environments, so that on one hand, parameter modulation and real-time control of a DFB laser in a multispectral light source are realized, and on the other hand, the analysis and processing of experimental data are realized.
As shown in fig. 2, the system further includes: and the displacement module 8 is used for carrying the self-focusing collimating lens and the self-focusing coupling lens, and the self-focusing collimating lens and the self-focusing coupling lens are controlled to move in the vertical direction through the displacement module 8 and are used for measuring the three-dimensional temperature and concentration field of the engine combustion chamber. The electric platform that displacement module 8 can go up and down along vertical direction has good motion accuracy and straightness accuracy, and electric platform passes through motor drive and follows perpendicular orbital motion with predetermined translation rate, and its repeated positioning accuracy is less than 10um, and scanning speed covers 0.5-500mm/s, can set for according to the experiment demand.
The embodiment of the present application further provides a method for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber, where the system for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber is adopted, as shown in fig. 4, the method includes:
and step S11, emitting laser beams to the engine combustion chamber by adopting the light source module, wherein the laser beams form a grid plane in the engine combustion chamber.
And step S12, collecting the laser beam by adopting a collection module based on the grid plane, and converting the laser beam into a first voltage signal.
And step S13, analyzing the first voltage signal by using a processing module, and determining the two-dimensional temperature and concentration field of the grid plane.
Specifically, multispectral absorption data are obtained according to the first voltage signal, the absorptivity distribution of each laser beam is determined according to the multispectral absorption data, and a target optimization function of a two-dimensional temperature and concentration field is established according to the absorptivity distribution; and inverting the target optimization function to obtain a two-dimensional temperature and concentration field of the engine combustion chamber.
In this embodiment, establishing an objective optimization function of two-dimensional temperature and concentration fields according to the absorptance distribution includes: acquiring a preset temperature matrix and an absorption component concentration matrix as shown in the following formula;
TMNto preset a temperature matrix, Pspecies-MNIs a predetermined absorption component concentration matrix.
And obtaining preset absorptivity distribution according to the temperature matrix and the absorption component matrix, calculating a difference value between the absorptivity distribution and the preset absorptivity distribution, and establishing a target optimization function according to the difference value. The specific calculation process is as follows:
according to the principle of absorption spectroscopy, the wavelength is λiAlong a certain absorption optical path l, the integral absorption rate A expression of the non-uniform flow field is as follows:
s is the spectral line intensity at a certain position l (a certain discrete grid point) along the optical path and the temperature is T; in the same way, Pspecies(l) At a certain position/at a certain discrete grid point, the temperature is the partial pressure of the absorbing component. The set of all laser beams, all wavelengths a, obtained by measurement is defined as the absorbance profile Pm(Lj,λi) Preset absorption rate profile Pc(Lj,λi) According to an assumed temperature matrix TMNAnd an absorbing component concentration matrix Pspecies_MNAnd (4) calculating. Will Pm(Lj,λi) And Pc(Lj,λi) As an optimization function for the idealized target, as follows:
in this embodiment, inverting the target optimization function to obtain a two-dimensional temperature and concentration field of the grid plane includes:
temperature smoothness and absorbent component partial pressure smoothness are obtained.
Specifically, the method comprises the following steps. In the actual inversion calculation, smoothness is added as a priori condition and is used for improving the solution of the ill-conditioned problem of the target optimization function, and the temperature smoothness and the absorbed component partial pressure smoothness are as follows:
the objective optimization function is expressed as:
in the formula, gammaTIn order to smooth the coefficient of the temperature,
the two are empirical values, and generally take real numbers between 0 and 1.
And inverting the target optimization function according to the temperature smoothness and the absorption component partial pressure smoothness, and obtaining a two-dimensional temperature and concentration field of the grid plane when the difference value between the absorption rate distribution and the preset absorption rate distribution reaches a preset condition.
Then iterating the possible temperature T continuouslyMNAnd concentration distribution Pspecies_MNWhen the difference in DA is minimal, the temperature matrix T is assumedMNAnd an absorbing component concentration matrix Pspecies_MNIs the true measurement.
In this embodiment, the method further includes: the displacement module is adopted to control the light source module and the acquisition module to move in the vertical direction, the acquisition module is adopted to acquire laser beams of a plurality of grid planes, the laser beams of the plurality of grid planes are converted into second voltage signals, the processing module is adopted to analyze the second voltage signals, and the three-dimensional temperature and concentration field of the engine combustion chamber are determined. The specific analysis process is the same as above. The test results refer to fig. 5-7.
The invention combines with the displacement mechanism, not only can realize the measurement of the dynamic temperature field and the concentration field of a certain single section of the engine combustion chamber, but also can realize the measurement of K two-dimensional grid planes through the movement of the displacement mechanism, the measured area is divided into NxMxK grid points, and the three-dimensional simulated annealing algorithm is combined to obtain the measurement results of the three-dimensional average temperature field and the concentration field with high spatial resolution. It should be noted that the obtained three-dimensional result is not a simple difference value of two-layer average results, but three-dimensional discrete calculation based on N × M × K grid points of the three-dimensional flame assumed structure, and the reconstruction algorithm is also a three-dimensional algorithm, so that the obtained three-dimensional temperature field and the obtained concentration field are more real. Meanwhile, the three-dimensional characteristics of the flame can be better reflected.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments described above as examples. It will be appreciated by those skilled in the art that various equivalent changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended to cover all such modifications and alterations as fall within the true spirit and scope of the invention.
Claims (10)
1. A system for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber, comprising: the device comprises a light source module, an acquisition module and a processing module, wherein the light source module and the acquisition module are oppositely arranged on the same horizontal plane of an engine combustion chamber;
the light source module is used for emitting a plurality of groups of laser beams into the engine combustion chamber, the laser beams are used for forming a grid plane in the engine combustion chamber, the collected laser beams are converted into voltage signals through the collecting module, the voltage signals are sent to the processing module, and the processing module is used for analyzing the voltage signals to determine the two-dimensional temperature and the concentration field of the grid plane.
2. The system of claim 1, wherein the light source module comprises: the device comprises a multispectral light source, an optical fiber beam splitter and a self-focusing collimating lens;
the multispectral light source couples and divides a light path into a plurality of light beams through the optical fiber beam splitter, and transmits the coupled light beams to the same number of self-focusing collimating lenses, wherein the self-focusing collimating lenses are arranged on a first side surface and a second side surface of the engine combustion chamber at equal intervals, and the first side surface is perpendicular to the second side surface.
3. The system of claim 2, wherein the acquisition module comprises: a self-focusing coupling lens and a photodetector;
the self-focusing coupling lens is arranged corresponding to the self-focusing collimating lens, is connected with the photoelectric detector and is used for sending the collected laser beams to the photoelectric detector to be converted into voltage signals.
4. The system of claim 3, wherein the processing module comprises: a high-speed data acquisition instrument and a control and data processor;
the high-speed data acquisition instrument is used for recording the voltage signal, sending the voltage signal to the control and data processor for analysis, and determining the two-dimensional temperature and concentration field of the engine combustion chamber;
the control and data processing module is also used for controlling the light source module.
5. The system of claim 3, further comprising: and the displacement module is used for carrying the self-focusing collimating lens and the self-focusing coupling lens, controlling the self-focusing collimating lens and the self-focusing coupling lens to move in the vertical direction through the displacement module, and measuring the three-dimensional temperature and concentration field of the engine combustion chamber.
6. A method for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber, which adopts the system for diagnosing a multidimensional temperature and concentration field of an engine combustion chamber as claimed in any one of claims 1 to 6, the method comprising:
adopting a light source module to emit laser beams to an engine combustion chamber, wherein the laser beams form a grid plane in the engine combustion chamber;
collecting the laser beam by adopting a collection module based on the grid plane, and converting the laser beam into a first voltage signal;
and analyzing the first voltage signal by adopting a processing module to determine the two-dimensional temperature and concentration field of the grid plane.
7. The method of claim 6, wherein analyzing the first voltage signal with a processing module to determine a two-dimensional temperature and concentration field of the grid plane comprises:
acquiring multispectral absorption data according to the voltage signal;
determining the absorptivity distribution of each laser beam according to the multispectral absorption data;
establishing a target optimization function of two-dimensional temperature and concentration fields according to the absorptivity distribution;
and inverting the target optimization function to obtain a two-dimensional temperature and concentration field of the engine combustion chamber.
8. The method of claim 7, wherein establishing an objective optimization function of two-dimensional temperature and concentration fields from the absorbance profile comprises:
acquiring a preset temperature matrix and an absorption component concentration matrix;
obtaining preset absorptivity distribution according to the temperature matrix and the absorption component matrix;
and calculating the difference value of the absorptivity distribution and a preset absorptivity distribution, and establishing the target optimization function according to the difference value.
9. The method of claim 7, wherein said inverting said objective optimization function to obtain a two-dimensional temperature and concentration field of said grid plane comprises:
acquiring temperature smoothness and absorption component partial pressure smoothness;
and inverting the target optimization function according to the temperature smoothness and the absorbed component partial pressure smoothness, and obtaining a two-dimensional temperature and concentration field of the grid plane when the difference value between the absorptivity distribution and a preset absorptivity distribution reaches a preset condition.
10. The method of claim 6, further comprising:
the displacement module is adopted to control the light source module and the acquisition module to move in the vertical direction;
collecting laser beams of a plurality of grid planes by using the collection module, and converting the laser beams of the plurality of grid planes into second voltage signals;
and analyzing the second voltage signal by adopting a processing module to determine the three-dimensional temperature and concentration field of the engine combustion chamber.
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