CN110567725A - Single-droplet spontaneous combustion detection device and method - Google Patents
Single-droplet spontaneous combustion detection device and method Download PDFInfo
- Publication number
- CN110567725A CN110567725A CN201910963797.8A CN201910963797A CN110567725A CN 110567725 A CN110567725 A CN 110567725A CN 201910963797 A CN201910963797 A CN 201910963797A CN 110567725 A CN110567725 A CN 110567725A
- Authority
- CN
- China
- Prior art keywords
- monochromator
- spontaneous combustion
- optical fiber
- drop
- fiber bundle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
Abstract
The invention discloses a single-droplet spontaneous combustion detection device and a method, wherein the device comprises a monochromator, a photomultiplier, a high-voltage power supply, a high-speed data acquisition card, a collimating lens and an optical fiber bundle; the collimating lens converges the optical signals around the single liquid drop to the inlet end of the optical fiber bundle, and the optical signals enter the monochromator through the transmission of the optical fiber bundle; the monochromator filters the optical signals with wide spectrum, and only the optical signals with specific wavelength can enter the photomultiplier; the photomultiplier converts the optical signal of specific wavelength into an amplified electrical signal and stores the amplified electrical signal in a high-speed data acquisition card. The device provided by the invention is low in price and high in sensitivity, and is beneficial to research on the problem of single-drop spontaneous combustion in a low-temperature environment.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine equipment, and particularly relates to a single-droplet spontaneous combustion detection device and a single-droplet spontaneous combustion detection method.
Background
The low temperature combustion technology can make the internal combustion engine realize high efficiency and low emission at the same time, and the key link of the low temperature combustion technology is the spray spontaneous combustion process. Due to the complex structure of the actual internal combustion engine, it is difficult to study the spray self-ignition process in detail and deeply.
Spraying can be regarded as the sum of a large number of droplets and spraying and single-droplet spontaneous combustion processes are similar, so that a thorough understanding of the single-droplet spontaneous combustion process is a necessary prerequisite for studying the spontaneous combustion of spraying. The existing single-droplet spontaneous combustion detection method comprises a backlight method, a free radical observation method and an interference method. Each method suffers from different problems or drawbacks: the backlight method uses a high-speed camera for observation, but only the bright flame appearance time can be obtained. The free radical observation method utilizes a high-power intensifier and a high-speed camera to obtain a combustion lag period by researching the evolution law of key free radicals (including hydroxyl, formaldehyde and the like). The interference method utilizes a helium-neon laser and a series of optical elements to observe the change of interference fringes to obtain the change of the ambient temperature of liquid drops, and further obtain the stagnation period. The spontaneous combustion detection equipment adopted by the latter two methods is expensive and has low sensitivity.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a single-drop spontaneous combustion detection device and a single-drop spontaneous combustion detection method.
Therefore, the invention adopts the following technical scheme:
A single-drop spontaneous combustion detection device comprises a monochromator, a photomultiplier, a high-voltage power supply, a high-speed data acquisition card, a collimating lens and an optical fiber bundle, and is used for detecting the spontaneous combustion process of single drops; the entrance end of the collimating lens is opposite to the single liquid drop and is used for collecting optical signals of the area around the single liquid drop; the optical fiber bundle is positioned at the outlet end of the collimating lens and used for transmitting optical signals; the inlet end of the monochromator is connected with the optical fiber bundle, and the outlet end of the monochromator is connected with the photomultiplier and used for filtering optical signals; the photomultiplier is used for converting the filtered optical signal into an amplified electrical signal, the high-voltage power supply and the high-speed data acquisition card are both electrically connected with the photomultiplier, the high-voltage power supply is used for providing electric energy for the photomultiplier, and the high-speed data acquisition card is used for storing data of the photomultiplier electrical signal.
Preferably, the collimating lens is arranged at one end of the collimating lens mirror holder, a first metal joint is arranged at the other end of the collimating lens mirror holder, and the end face of the first metal joint is arranged at a position near the focus of the collimating lens; the input end of the optical fiber bundle is connected to the first metal connector, and the output end of the optical fiber bundle is connected to the second metal connector.
preferably, the optical fiber bundle comprises four optical fiber filaments, and the four optical fiber filaments are arranged in a square shape in the central area of the end face of the first metal joint; on the end face of the second metal joint, four optical fibers are arranged in a straight line.
Preferably, the diameter of each fiber filament is 1mm, and the surface cladding material of the fiber bundle is PVC; the linear arrangement of the four optical fibers is parallel to the knife edge at the inlet end of the monochromator.
Preferably, the diameter of the collimating lens is much larger than the diameter of a single droplet.
Preferably, the optical fiber bundle is mechanically connected with the inlet end of the monochromator, and the photomultiplier is mechanically connected with the outlet end of the monochromator; the width of a knife edge at the inlet end of the monochromator is adjustable; the width of the knife edge at the outlet end of the monochromator is adjustable.
Preferably, the voltage of the high voltage power supply is adjustable.
Preferably, the single liquid drop is placed in the heating cavity, four pieces of quartz glass are installed on four side surfaces of the heating cavity, and an optical signal generated by the reaction of the single liquid drop in the heating cavity reaches the collimating lens after passing through the quartz glass.
A single-liquid-drop spontaneous combustion detection method adopts the single-liquid-drop spontaneous combustion detection device for detection, and the detection process is as follows: the collimating lens converges the optical signal released by the single liquid drop to the inlet end of the optical fiber bundle, and the optical signal enters the inlet end of the monochromator through the transmission of the optical fiber bundle; the monochromator filters the optical signals with wide spectrum, and only the optical signals with specific wavelength enter the photomultiplier through the outlet end of the monochromator; the photomultiplier converts the optical signal with specific wavelength into an amplified electrical signal, and finally stores the amplified electrical signal in a high-speed data acquisition card.
Preferably, the voltage of the high-voltage power supply is set to 700V, and the acquisition rate of the high-speed data acquisition card is 200 Hz.
Compared with the prior art, the invention has the beneficial effects that:
(1) The main equipment used in the invention is a monochromator, which is much cheaper than the high-speed camera and the high-power intensifier, thus saving the cost on the whole.
(2) The sensitivity of the single-droplet spontaneous combustion detection device can be improved by increasing the voltage of the high-voltage power supply, and the research requirements can be met.
(3) The diameter of the collimating lens is far larger than that of the liquid drop, so that the applicability of the single-liquid-drop spontaneous combustion detection device is improved.
(4) The device has the advantages of simple structure, convenience in use, low price and high sensitivity, and is beneficial to research on the problem of single-drop spontaneous combustion in a low-temperature environment.
Drawings
Fig. 1 is a schematic structural composition diagram of a single-droplet spontaneous combustion detection apparatus provided in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a fiber collimating lens structure in a single-droplet spontaneous combustion detection apparatus according to an embodiment of the present invention.
Description of reference numerals: 1. a first quartz glass; 2. a heating cavity; 3. a second quartz glass; 4. a flame; 5. a single droplet; 6. a third quartz glass; 7. a fourth quartz glass; 8. an optical signal; 9. a collimating lens; 10. a fiber optic bundle; 11. a monochromator; 12. a photomultiplier tube; 13. a high voltage power supply; 14. a high-voltage wire; 15. a signal line; 16. a high-speed data acquisition card; 17. a second fiber optic filament; 18. a first optical fiber filament; 19. a third fiber optic filament; 20. a first metal joint end face; 21. a fourth fiber optic filament; 22. a collimating lens frame; 23. a first metal joint; 24. a second metal joint; 25. a second metal joint end face.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are provided for illustration only and are not to be construed as limiting the invention.
Examples
A single-drop spontaneous combustion detection device is suitable for equipment such as internal combustion engines, coal combustion boiler devices, gas turbines and the like. As shown in fig. 1, the single-droplet spontaneous combustion detection device includes a heating chamber 2, 4 pieces of quartz glass (respectively, a first quartz glass 1, a second quartz glass 3, a third quartz glass 6, and a fourth quartz glass 7) installed on 4 side surfaces of the heating chamber 2, a collimating lens 9, an optical fiber bundle 10, a monochromator 11 connected to the optical fiber bundle 10, a photomultiplier 12 connected to an outlet end of the monochromator 11, a high voltage power supply 13 electrically connected to the photomultiplier 12, and a high speed data acquisition card 16 electrically connected to the photomultiplier 12.
As shown in fig. 2, the fiber collimating lens structure mainly comprises a collimating lens 9 and a fiber bundle 10, and includes a collimating lens 9, a collimating lens frame 22 connected to the collimating lens 9, a first metal connector 23 connected to the other end of the collimating lens frame 22, a fiber bundle 10 connected to the first metal connector 23, and a second metal connector 24 connected to the fiber bundle 10. The input end of the optical fiber bundle 10 is a first metal connector 23, and the output end is a second metal connector 24. The optical fiber bundle 10 comprises four optical fiber filaments (a second optical fiber filament 17, a first optical fiber filament 18, a third optical fiber filament 19 and a fourth optical fiber filament 21) with the diameter of 1mm, and the surface cladding material of the optical fiber bundle is PVC. In the central area of the first metal terminal end face 20, 4 optical fiber filaments are arranged in a square shape; on the second metal joint end face 25, 4 optical fibers are arranged in a straight line. The second metal connector 24 is mechanically connected with the inlet end of the monochromator 11, and the linear arrangement of the 4 optical fibers is parallel to the knife edge at the inlet end of the monochromator 11.
A single droplet 5 of approximately 1mm diameter enters the high temperature environment of the heating chamber 2 and the fuel vapour surrounding the single droplet 5 undergoes a chemical reaction, but the region which first enters the auto-ignition stage is uncertain. During the chemical reaction, a large number of hydroxyl radicals are released. The hydroxyl radical transitions from the excited state to the ground state, releasing an optical signal at a wavelength of 308 nm. The collimator lens 9, which has a diameter of 25.4mm, will collect the entire optical signal 8 of the area around the single droplet 5. The optical signal 8 passes through the collimating lens 9 and will be converged at the central region of the first metal joint end face 20. The optical signal 8 passes through a fiber bundle 10 into the entrance end of a monochromator 11. The inlet end and the outlet end of the monochromator 11 are of a double-knife-edge structure with adjustable width, the knife edge width of the inlet end is set to be 1mm, and the knife edge width of the outlet end is set to be 2 mm. Because the mechanical grating of the monochromator 11 is set to 308nm, only optical signals with a wavelength of 308nm can leave the monochromator exit end. The photomultiplier tube 12 may convert the weak optical signal into an amplified electrical signal and store the amplified electrical signal in the high speed data acquisition card 16. The voltage of the high voltage power supply 13 is set to 700V. The sampling frequency of the high-speed data acquisition card 16 is 200Hz, and the maximum acquisition amount in a single time is 500 data.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and scope of the present invention are intended to be covered thereby.
Claims (10)
1. A single-drop spontaneous combustion detection device comprises a monochromator, a photomultiplier, a high-voltage power supply, a high-speed data acquisition card, a collimating lens and an optical fiber bundle, and is used for detecting the spontaneous combustion process of single drops; the method is characterized in that: the entrance end of the collimating lens is opposite to the single liquid drop and is used for collecting optical signals of the area around the single liquid drop; the optical fiber bundle is positioned at the outlet end of the collimating lens and used for transmitting optical signals; the inlet end of the monochromator is connected with the optical fiber bundle, and the outlet end of the monochromator is connected with the photomultiplier and used for filtering optical signals; the photomultiplier is used for converting the filtered optical signal into an amplified electrical signal, the high-voltage power supply and the high-speed data acquisition card are both electrically connected with the photomultiplier, the high-voltage power supply is used for providing electric energy for the photomultiplier, and the high-speed data acquisition card is used for storing data of the photomultiplier electrical signal.
2. the single-drop spontaneous combustion detection device of claim 1, wherein: the collimating lens is arranged at one end of the collimating lens mirror holder, a first metal joint is arranged at the other end of the collimating lens mirror holder, and the end face of the first metal joint is arranged at a position close to the focus of the collimating lens; the input end of the optical fiber bundle is connected to the first metal connector, and the output end of the optical fiber bundle is connected to the second metal connector.
3. The single-drop spontaneous combustion detection device of claim 2, wherein: the optical fiber bundle comprises four optical fibers, and the four optical fibers are arranged in a square shape in the central area of the end face of the first metal connector; on the end face of the second metal joint, four optical fibers are arranged in a straight line.
4. A single-drop spontaneous combustion detection apparatus according to claim 3, wherein: the diameter of each optical fiber filament is 1mm, and the surface cladding material of the optical fiber bundle is PVC; the linear arrangement of the four optical fibers is parallel to the knife edge at the inlet end of the monochromator.
5. The single-drop spontaneous combustion detection device of claim 1, wherein: the diameter of the collimating lens is much larger than the diameter of a single drop.
6. The single-drop spontaneous combustion detection device of claim 1, wherein: the optical fiber bundle is mechanically connected with the inlet end of the monochromator, and the photomultiplier is mechanically connected with the outlet end of the monochromator; the width of a knife edge at the inlet end of the monochromator is adjustable; the width of the knife edge at the outlet end of the monochromator is adjustable.
7. The single-drop spontaneous combustion detection device of claim 1, wherein: the voltage of the high-voltage power supply is adjustable.
8. A single-drop spontaneous ignition detection apparatus according to any one of claims 1 to 7, wherein: the single liquid drop is arranged in the heating cavity, four pieces of quartz glass are arranged on four side surfaces of the heating cavity, and an optical signal generated by the reaction of the single liquid drop in the heating cavity reaches the collimating lens after penetrating through the quartz glass.
9. A single-drop spontaneous combustion detection method is characterized in that: the single-drop spontaneous combustion detection device as claimed in any one of claims 1 to 8, wherein the detection process comprises the following steps: the collimating lens converges the optical signal released by the single liquid drop to the inlet end of the optical fiber bundle, and the optical signal enters the inlet end of the monochromator through the transmission of the optical fiber bundle; the monochromator filters the optical signals with wide spectrum, and only the optical signals with specific wavelength enter the photomultiplier through the outlet end of the monochromator; the photomultiplier converts the optical signal with specific wavelength into an amplified electrical signal, and finally stores the amplified electrical signal in a high-speed data acquisition card.
10. The single-droplet spontaneous combustion detection method according to claim 9, characterized in that: the voltage of the high-voltage power supply is set to 700V, and the acquisition rate of the high-speed data acquisition card is 200 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910963797.8A CN110567725A (en) | 2019-10-11 | 2019-10-11 | Single-droplet spontaneous combustion detection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910963797.8A CN110567725A (en) | 2019-10-11 | 2019-10-11 | Single-droplet spontaneous combustion detection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110567725A true CN110567725A (en) | 2019-12-13 |
Family
ID=68784482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910963797.8A Pending CN110567725A (en) | 2019-10-11 | 2019-10-11 | Single-droplet spontaneous combustion detection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110567725A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484025A (en) * | 2021-08-11 | 2021-10-08 | 合肥工业大学 | Flame temperature measuring device of optical engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792090A (en) * | 2013-07-12 | 2014-05-14 | 江苏大学 | Diesel engine in-cylinder spraying and combustion visualization testing apparatus and testing method |
| CN104502112A (en) * | 2014-12-15 | 2015-04-08 | 同济大学 | System and method for measuring combustion characteristic of internal combustion engine based on infrared radiation |
| CN105115920A (en) * | 2015-08-26 | 2015-12-02 | 西安科技大学 | Experiment system and experiment method for testing ignition delay time of combustible gas |
| CN106442853A (en) * | 2016-09-07 | 2017-02-22 | 华中科技大学 | Droplet burning experiment device |
-
2019
- 2019-10-11 CN CN201910963797.8A patent/CN110567725A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792090A (en) * | 2013-07-12 | 2014-05-14 | 江苏大学 | Diesel engine in-cylinder spraying and combustion visualization testing apparatus and testing method |
| CN104502112A (en) * | 2014-12-15 | 2015-04-08 | 同济大学 | System and method for measuring combustion characteristic of internal combustion engine based on infrared radiation |
| CN105115920A (en) * | 2015-08-26 | 2015-12-02 | 西安科技大学 | Experiment system and experiment method for testing ignition delay time of combustible gas |
| CN106442853A (en) * | 2016-09-07 | 2017-02-22 | 华中科技大学 | Droplet burning experiment device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484025A (en) * | 2021-08-11 | 2021-10-08 | 合肥工业大学 | Flame temperature measuring device of optical engine |
| CN113484025B (en) * | 2021-08-11 | 2024-05-03 | 合肥工业大学 | Flame temperature measuring device of optical engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101819064A (en) | Normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system | |
| CN109856085B (en) | Device and method for synchronously measuring transient fuel oil spraying and combustion processes | |
| CN106404410A (en) | Apparatus capable of simultaneously measuring diesel spray structure and combustion characteristic and method thereof | |
| CN101625269B (en) | Method for simultaneously monitoring two-dimensional distribution of combustion flame temperature field and concentration of combustion flame intermediate product | |
| CN111487228A (en) | Device for synchronously measuring combustion intermediate products and main components | |
| Dibble et al. | An improved method of data aquisition and reduction for laser raman-rayleigh and fluorescence scattering from Multispecies | |
| CN102680451B (en) | System for removing Raman spectral scattering background noise | |
| US7281382B2 (en) | Method and apparatus for detecting the presence of flame in the exhaust path of a gas turbine engine | |
| CN110567725A (en) | Single-droplet spontaneous combustion detection device and method | |
| CN101793827A (en) | Method for online measurement of concentration of OH free radical in flame zone of Class B fire and flame device | |
| CN113820035B (en) | Femtosecond laser filament remote non-contact temperature measurement device and measurement method | |
| CN111521297B (en) | Spectrum-temperature calibration device and method suitable for phosphorescence ratio light intensity method | |
| CN105737995A (en) | High-power laser multi-parameter measurement device based on integrating sphere | |
| CN214472779U (en) | For detecting SF6Enhanced Raman spectrum detection system for decomposed gas | |
| CN110057795A (en) | A kind of method and device of the spectral detection of femtosecond plasma breakdown ionization | |
| Feugnet et al. | Improved laser-induced fluorescence method for bio-attack early warning detection system | |
| CN112230015A (en) | System and method for testing flame propagation speed in premixed gas deflagration process | |
| CN209027994U (en) | A kind of multichannel optical fiber formula gas Raman scatterometry system | |
| CN1220871C (en) | Real time monitoring device for nanometer particle diameter during nanometer material preparation using sol-gel method | |
| CN205941367U (en) | Plasma accuracy of measurement with excitation light source | |
| JPS6123928A (en) | Spectral analyzing device for combustion flame using optical fiber | |
| KIMBALL-LINNE et al. | Fiberoptic absorption/fluorescence combustion diagnostics | |
| CN108303184A (en) | A kind of device and method of real-time monitoring tunable laser Output of laser wavelength and energy | |
| CN218003261U (en) | Article identification instrument based on ash component detection | |
| CN112748101B (en) | High-altitude electric power material corrosive monitoring system based on optical fiber Raman spectrometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191213 |
|
| RJ01 | Rejection of invention patent application after publication |