CN212931908U - Diagnosis system for multidimensional temperature and concentration field of engine combustion chamber - Google Patents
Diagnosis system for multidimensional temperature and concentration field of engine combustion chamber Download PDFInfo
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- CN212931908U CN212931908U CN202020129218.8U CN202020129218U CN212931908U CN 212931908 U CN212931908 U CN 212931908U CN 202020129218 U CN202020129218 U CN 202020129218U CN 212931908 U CN212931908 U CN 212931908U
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Abstract
The embodiment of the utility model provides a diagnostic system of engine combustion chamber multidimension temperature and concentration field is related to, include: the device comprises a light source module, an acquisition module, a processing module and a displacement 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 in the engine combustion chamber through the laser beams, converting the collected laser beams into voltage signals through the collection 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 concentration field of the grid plane; the displacement module is used for controlling the light source module and the acquisition module to move in the vertical direction so as to measure the three-dimensional temperature and concentration field of the engine combustion chamber. The measurement results of the three-dimensional temperature and concentration field of the combustion chamber of the engine can be obtained by combining the displacement module while the measurement of the dynamic two-dimensional temperature field and concentration field with high time and space resolution is realized.
Description
Technical Field
The embodiment of the utility model provides a relate to engine combustion chamber temperature and concentration field measurement field, especially relate to a diagnostic system of engine combustion chamber multidimension temperature and concentration field.
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) has the advantages of real-time quantitative diagnosis capability on multiple parameters (temperature and component concentration) of a combustion field and no interference to the combustion field, and is a development hotspot in the current international combustion diagnosis field. 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 ensures that the TDLAT only needs two mutually-perpendicular projection angles, and the smaller projection angle means that the orthogonal light path + multispectral light source technology experiment system is more easily applied to actual measurement environment and higher measurement speed. A very representative work was "50-kHz-rate 2D imaging of temperature and H published by Lin Ma in 20132O-center at the extreme plane of a J85 engine using hyperspectral tomogrAN _ SNhy, Optics Express,21(1), 1152-1162' which adopts a 15 x 15 orthogonal optical 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 proposal has the following problems: 1) the multispectral light source adopts a Fourier mode-locked fiber laser, and can sweep about 30nm wavelength range under the frequency of 50kHz, but the laser is expensive and immature in technology, for example, the wavelength stability and 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.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a diagnostic system of engine combustion chamber multidimension temperature and concentration field can realize when the dynamic two-dimensional temperature field of high time, space resolution and concentration field are measured, combines the displacement module, can obtain the measuring result of engine combustion chamber three-dimensional temperature and concentration field.
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.
The embodiment of the utility model provides a diagnostic system of engine combustion chamber multidimension temperature and concentration field adopts multispectral light source tomography technical scheme, and n (n is greater than or equal to 4) absorption spectral lines have been arranged on the monocycle light path, can realize this kind of minimum projection angle's of quadrature formula light path and arrange, change the realization at real engine combustion chamber measurement scene, have more the practicality promptly.
The multispectral light source prepared based on n (n is more than or equal to 4) DFB lasers in time-sharing coupling is cheaper than a Fourier mode-locked fiber laser; 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 utility model discloses an orthogonal light path transmission and receiving terminal adopt auto-focus collimating lens and auto-focus coupling lens respectively, and these two kinds of lens are cylindrical structure, and the diameter is not more than 2.5mm to when guaranteeing to measure light path collimation degree, coupling efficiency, realized the miniaturization to engine combustion chamber optical structure, effectively reduced adjacent beam interval to 4mm, promote spatial resolution by a wide margin (this system spatial resolution is the present international burning diagnosis field orthoscopic laser absorption spectrum maximum level).
The utility model discloses a self-focusing coupling lens possesses the end face coupling characteristic, transmission laser assembles the formation of image at multimode fiber end face promptly, can effectively improve the coupling efficiency of laser and multimode fiber, the transmissivity reaches more than 90% at 380 supple of material 2000nm wavelength range, effective logical light diameter is 70% of lens diameter, play the effect of diaphragm when guaranteeing logical light efficiency, possess the function of filtering stray light and the luminous influence of burning flame promptly, effectively promote and measure original signal SNR.
The utility model discloses combine displacement mechanism, not only can realize that the dynamic temperature field and the concentration field of a certain single cross-section of engine combustion chamber measure, through displacement mechanism's removal, realize that K two-dimensional section is measured, measured regional division is N M K mesh point, combines three-dimensional simulation annealing to calculate and reverses, obtains high spatial resolution's three-dimensional average temperature field and component concentration field measuring result. 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.
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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 labor.
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 an engine combustion chamber according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the technical method in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection 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 embodiments of the present invention, the directional indications are only used to explain the relative position relationship between the components in a specific posture, the motion condition, etc., and if the specific 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, a grid plane is formed in the engine combustion chamber through the laser beams, 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.
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 the 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 self-focusing collimating lens 3 and the self-focusing coupling lens 4 in this embodiment are aligned with an optical window 10 disposed in the combustion chamber of the engine.
In this embodiment, the engine combustion chamber is a real engine component or a complete machine which uses hydrogen or hydrocarbon fuel and generates power by burning and releasing heat, and the engine 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 photodetector 5 in this embodiment is an indium gallium arsenic photodetector, and has an applicable wavelength range of 800-.
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 utility model discloses combine displacement mechanism, not only can realize that the dynamic temperature field and the concentration field of a certain single cross-section of engine combustion chamber measure, through displacement mechanism's removal, realize the planar measurement of K two-dimensional grid, the measured range is divided into N M K grid points, combines three-dimensional simulated annealing algorithm, obtains high spatial resolution's three-dimensional average temperature field and concentration field measuring result.
The above detailed description of the embodiments of the present invention has been provided, but the present invention is not limited to the above described embodiments as examples. Any equivalent modifications or substitutions of the present invention are within the scope of the present invention for those skilled in the art, and therefore, equivalent changes, modifications, improvements, etc. made without departing from the spirit and principle of the present invention are intended to be covered by the scope of the present invention.
Claims (4)
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, a processing module and a displacement 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 in the engine combustion chamber through the laser beams, converting the collected laser beams into voltage signals through the collection module, and sending the voltage signals to the processing module, and the processing module is used for analyzing the voltage signals to determine a two-dimensional temperature and concentration field of the grid plane;
the displacement module is used for controlling the light source module and the acquisition module to move in the vertical direction so as to measure the three-dimensional temperature and concentration field of the engine combustion chamber.
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.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798550A (en) * | 2021-04-14 | 2021-05-14 | 四川大学 | Wide-measurement-range laser absorption spectrum combustion diagnosis method |
| CN114136479A (en) * | 2021-10-20 | 2022-03-04 | 中国航发四川燃气涡轮研究院 | Optical machine structure for measuring outlet temperature distribution of combustion chamber |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798550A (en) * | 2021-04-14 | 2021-05-14 | 四川大学 | Wide-measurement-range laser absorption spectrum combustion diagnosis method |
| CN112798550B (en) * | 2021-04-14 | 2021-07-13 | 四川大学 | Wide-measurement-range laser absorption spectrum combustion diagnosis method |
| CN114136479A (en) * | 2021-10-20 | 2022-03-04 | 中国航发四川燃气涡轮研究院 | Optical machine structure for measuring outlet temperature distribution of combustion chamber |
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