CN103760142A - Optical measuring method and device for spatial distribution of liquid droplets of fuel nozzle - Google Patents
Optical measuring method and device for spatial distribution of liquid droplets of fuel nozzle Download PDFInfo
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- CN103760142A CN103760142A CN201410016338.6A CN201410016338A CN103760142A CN 103760142 A CN103760142 A CN 103760142A CN 201410016338 A CN201410016338 A CN 201410016338A CN 103760142 A CN103760142 A CN 103760142A
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Abstract
The invention discloses an optical measuring method and device for the spatial distribution of liquid droplets of a fuel nozzle. By using a characteristic that aromatic compounds in aviation kerosene can emit red-shift fluorescence signals under the excitation of ultraviolet light with a wavelength of 266 nm, a correction scheme for solving the problem that the measurement errors of spatial distribution of fuel are caused due to the attenuation of laser energy in a droplet cone is designed. The method and device disclosed by the invention are characterized in that the spatial distribution of the liquid droplets in the fuel droplet cone can be quickly and accurately measured, and have an advantage of flow field noninterference, transient and time average results can be obtained, and a deficiency that only an average result can be obtained by a fuel accumulation method is solved. The optical measuring method for the spatial distribution of liquid droplets of a fuel nozzle disclosed by the invention can be used for measuring the spatial distribution characteristics of the liquid droplets in the droplet cone of the fuel nozzle of an aero-engine or an internal combustion engine, and for fuel which does not contain fluorescent components, a tracer agent is required to be added.
Description
Technical field
The present invention relates to a kind of fuel nozzle drop space distribution measuring method and device, the fluorescence signal sending while relating in particular to the ultraviolet excitation that the aromatics in a kind of RP-3 of utilization aviation kerosene is 266nm at wavelength is for optic test and the error correction techniques of fuel space distribution measuring.
Background technology
Develop advanced gas-turbine combustion chamber technology and mainly rely on good atomization, air and fuel fast and the blending of homogeneous, this mode can avoid the disadvantageous condition of burning performance, pollutant emission and engine life to occur.The atomization characteristics such as drop mean grain size, particle diameter distribution and fuel space distribution all have important impact to the performance of firing chamber.
For improving burning efficiency, reducing pollutant emission and the distribution of Optimizing Combustion chamber outlet temperature, except guaranteeing that the enough little evaporation process that makes of drop is not the determinative of burning efficiency, in firing chamber, fuel distribution is wanted evenly, so the distribution of mist cone fuel space is an importance of atomization characteristics.Artificial observation is difficult to find the asymmetry of mist cone, unless mist cone asymmetry especially severe.Therefore, for design and the atomization quality detection of nozzle, need to determine quantitative analysis fuel space distribution character.The spatial characteristics of mist cone intermediate fuel oil is generally by radially representing with circumferential skewness, and its measuring method can be divided into two large classes: the traditional measurement method of contact and contactless measuring method.The detection method that fuel oil radial distribution unevenness is traditional is radially equal angles or the some graduated cylinders of disposed at equal distance below nozzle, and the fuel oil height in graduated cylinder obtains fuel oil distribution radially.The traditional detection method of the circumferential skewness of fuel oil is in center by nozzle, the bottom of nozzle mist cone is circumferentially divided into some sector regions, be generally 12 or 16 (see figure 1)s, fuel oil in each sector region is collected respectively in container, and the standard error of each container intermediate fuel oil amount represents the circumferential skewness of fuel oil.Although traditional detection method can provide the spatial characteristics of fuel oil, but in the classic method of insertion type, collect the machining precision of fuel container, impact on mist cone and surrounding air flow field, and the installation accuracy of fuel nozzle all on circumferentially and radial distribution homogeneity have larger impact, measuring accuracy is not high.Traditional radially often produce larger not repeated with circumferential twice measurement.In addition, traditional detection method can only be measured the mean value in certain hour interval, can not measure the Transient distribution of fuel oil.The appearance of non-intervention type laser diagnostics method, has solved the problem of insertion type method to mist cone and flow.The laser diagnostics technology of measuring for flow indication, particle diameter and fuel distribution comprises particle image velocimeter (PIV), planar laser induced fluorescence (PLIF), Phase Doppler Particle Analyzer (PDPA) and plane laser scattering method (PLS) etc.PLS method based on Lorenz-Mie scattering theory is applied in the measurement of mist cone space distribution character, but PLS method is less than the regional area of 50 μ m at particle diameter, the intensity of scattered signal is greater than actual fuel distribution, therefore particle diameter is less than the regional area of 50 μ m, and the fuel distribution that PLS method is measured is bigger than normal.The fluorescent dye of PLIF method based on adding in fuel oil sends fluorescence when the irradiation of certain wavelength, cube being directly proportional of the intensity of fluorescence signal and particle diameter.But PLIF method can only be for the more sparse mist cone of concentration of liquid drops, in concentration of liquid drops is bored compared with dense fog, laser intensity weakens along light path direction exponentially in test section, cause along rear portion, light path test section laser intensity very weak, therefore, very weak along rear portion, light path test section fluorescence signal, cause fuel distribution measuring error.
Summary of the invention
The technical problem to be solved in the present invention is: for overcoming the shortcoming and defect of above-mentioned prior art, the present invention adopts fuel oil via Laser-induced Fluorescence Method to realize drop spatial characteristics in fuel nozzle mist cone and measures, fuel distribution optical measurement testing program and image processing method case have been designed, and designed laser energy and decayed and cause the correcting scheme of fuel distribution measuring error in mist cone, improved speed and the precision of fuel distribution optical measurement.
The technical solution adopted for the present invention to solve the technical problems: a kind of fuel nozzle drop space distribution measuring method, the fuel oil that described fuel nozzle sprays forms mist cone under it, contains spike component in described fuel oil, it is characterized in that, described measuring method comprises
--under described fuel nozzle, a distance projects a laser light sheet, described sheet laser is perpendicular to the central shaft of described mist cone, the xsect of described mist cone at the place, locus of sheet laser forms circumferentially test plane of a mist cone, or, described sheet laser is parallel to the central shaft of described mist cone, and the section constitution one mist axis of cone that described mist cone is located in the locus of sheet laser is to test plane;
--when described sheet laser is arranged perpendicular to the central shaft of described mist cone, at described mist cone, circumferentially above the side-lower of test plane or side, arrange an image collecting device, and circumferentially test plane is angled with described mist cone, described image collecting device gathers the fuel distribution image in the circumferential test of described mist cone plane; When described sheet laser is parallel to the central shaft layout of described mist cone, perpendicular to described axial test floor plan one image collecting device, gather the described mist axis of cone to the true fuel distribution image of testing section;
--before the camera lens of described image collecting device, arrange an optical filter, described optical filter, in order to separated scattered signal and fluorescence signal, makes described image collecting device only gather fluorescence signal;
--when described sheet laser is arranged perpendicular to the central shaft of described mist cone, fuel space distribution measuring is carried out to error correction, correction is because of the decay error that to fuel distribution mass measurement produce of laser intensity at mist cone, proofread and correct the mist cone causing due to described image collecting device camera site simultaneously and circumferentially test the measuring error that in plane, local light path difference produces: complete after one-shot measurement, keep image collecting device and trystate parameter to remain unchanged, described fuel nozzle Rotate 180 ° is measured for the second time, the image measuring for the second time be take to fuel nozzle center again as initial point Rotate 180 °, and synthesize an image with the image measuring for the first time,
--analysis image, determine the space distribution situation of drop.
Preferably, it is working medium that described fuel oil adopts domestic RP-3 aviation kerosene, while adopting other fuel to be working medium, need to add tracer agent.
Preferably, described image collector is set to enhancement mode CCD camera.Preferably, described enhancement mode CCD camera comprises ultraviolet lens, image intensifier, the CCD camera connecting successively.Further preferably, setup times isochronous controller, simultaneously to described image intensifier and CCD camera transmitting TTL signal, is controlled the shutter opening time of described image intensifier and CCD camera.
Preferably, described laser is that wavelength is the exciting light of 266nm.Further preferably, the laser beam that described sheet laser is sent by YAG laser instrument enters sheet laser moulding optical element by laser guide arm and forms, and the thickness of described sheet laser is about 1mm.
Preferably, when described sheet laser is arranged perpendicular to the central shaft of described mist cone, described CCD collected by camera to described mist cone circumferentially the fuel distribution image in test plane there is geometry deformation, by the geometric correction of imagery, obtain the circumferentially true picture of test plane of described mist cone.
Preferably, when described sheet laser is arranged perpendicular to the central shaft of described mist cone, described CCD camera is circumferentially tested plane with described mist cone and is become 30-60 degree angle.
Preferably, when described sheet laser perpendicular to or the central shaft that is parallel to described mist cone while arranging, need to carry out background correction, eliminate the impact on fuel space distribution measuring of visible ray in surrounding environment.
Realize first at home RP-3 aviation kerosene-laser-induced fluorescence (LIF) and measured for fuel nozzle space distribution, and designed fuel distribution measuring error correction scheme, improved measuring accuracy.Utilize aromatics in aviation kerosene under UV-irradiation, aromatics transits to excited state, and the fluorescence signal that red shift occurs is sent in decay subsequently.Designed optical measurement test unit, sheet laser is bored central shaft perpendicular to mist, and camera is positioned at the survey below of test plane, in conjunction with the separated scattered signal of optical filter and fluorescence signal, makes enhancement mode CCD camera only gather fluorescence signal.Under different camera gate-widths, determined the time delay dt that the transmitting of best laser device laser and camera shutter are opened, the time period that makes fluorescence signal generation within the time period, can guarantee to collect fluorescence signal image clearly in the gate-width of camera.The mist cone cross sectional image of the geometry deformation gathering by physical dimension correcting camera, obtains real mist cone cross sectional image.By in mist cone both sides respectively incident laser carry out twice measurement, then 180 ° of the image rotations measuring are for the second time merged with the image measuring for the first time, eliminate the measuring error that laser energy is decayed and caused in mist cone.
According to an aspect of the present invention, a kind of test unit of fuel distribution optical measurement is also provided, comprise fuel nozzle, sheet laser forms device, image collecting device, it is characterized in that, the fuel oil that described fuel nozzle sprays forms mist cone under it, described sheet laser forms device and under described fuel nozzle, projects a sheet laser, described sheet laser is perpendicular to the central shaft of described mist cone, the xsect of described mist cone at the place, locus of sheet laser forms circumferentially test plane of a mist cone, or, described sheet laser is parallel to the central shaft of described mist cone, the section constitution one mist axis of cone that described mist cone is located in the locus of sheet laser is to test plane, when described sheet laser is arranged perpendicular to the central shaft of described mist cone, at described mist cone, circumferentially above the side-lower of test plane or side, arrange an image collecting device, and circumferentially test plane is angled with described mist cone, when described sheet laser is parallel to the central shaft layout of described mist cone, perpendicular to described axial test floor plan one image collecting device, before the camera lens of described image collecting device, arrange an optical filter, described test unit also comprises control device and the time synchronized controller of mutual communication connection, and described time synchronized controller communicates to connect described sheet laser and forms device and image collecting device.
Preferably, described image collector is set to enhancement mode CCD camera, comprises the optical filter, ultraviolet lens, image intensifier, the CCD camera that connect successively, and described time synchronized controller communicates to connect with described image intensifier and CCD camera simultaneously.
Described sheet laser forms device and comprises YAG laser instrument, laser guide arm, the sheet laser moulding optical element connecting successively.
Described control device is PC.
According to an aspect of the present invention, the measuring method that provides a kind of fuel nozzle mist cone intermediate fuel oil or drop space distribution to measure, it is characterized in that, based on domestic RP-3 aviation kerosene, utilize the fluorescent components in fuel oil, in conjunction with the laser Induced Fluorescence Technology of fuel oil, realize the measuring method of fuel nozzle mist cone intermediate fuel oil space distribution measurement.Aromatics in aviation kerosene enters excited state under ultraviolet excitation, by excited state decay, send the fluorescence signal of red shift subsequently, adopt optically filtering sheet that exciting light is separated with fluorescence signal at the scattered signal on drop surface, only allow fluorescence signal pass through optical filter, adopt enhancement mode CCD collected by camera fluorescence signal.
Preferably, adopting the light source that wavelength is 266nm is exciting light.
Preferably, in the present invention, adopting domestic RP-3 aviation kerosene is working medium, while adopting other fuel to be working medium, need to add tracer agent.
Preferably, described optically filtering sheet adopts long pass filter sheet to realize the separated of scattered signal and fluorescence signal, and experimental situation is carried out in darkroom, avoids the impact of visible ray on optical measurement in surrounding environment.
According to a further aspect in the invention, provide a kind of testing program of fuel distribution optical measurement, described testing program comprises the layout of optical element and the layout of testpieces.When in this testing program, sheet laser is axial perpendicular to testpieces, camera is positioned at side-lower or the side top of test plane, obtaining the fuel distribution in fuel nozzle mist cone circumferential cross-section, there is geometry deformation in the image directly collecting, and obtains the true picture of mist cone xsect by the geometric correction of imagery.When sheet laser is parallel to testpieces when axial, camera, perpendicular to test plane, can obtain the true fuel distribution image of mist cone axial cross section.In two kinds of fuel distribution measurement scheme, all need background correction, to eliminate the impact on fuel space distribution measuring of visible ray in surrounding environment.
Preferably, in this testing program, sheet laser is axial perpendicular to testpieces, and camera is positioned at the side-lower of test plane, in test plane, becomes 30-60 degree.
Preferably, in this test unit, the gate-width of image intensifier is 100ns.
According to a further aspect of the invention, provide a kind of fuel space distribution measuring error calibration method.For the decay error that to fuel distribution mass measurement produce of calibration of laser intensity at mist cone, taked the method (see figure 3) at same position Rotate 180 ° nozzle.After one-shot measurement completes, image acquisition and trystate parameter all remain unchanged, and nozzle Rotate 180 ° is measured for the second time.The image Zai Yi nozzle center obtaining after nozzle Rotate 180 ° is initial point Rotate 180 °, and such to measure the image that CCD camera obtains for twice be same mist cone xsect, and the image of collection is shown in Fig. 3.While measuring for twice, laser lays respectively at both sides B and the D of nozzle, and the measurement result of twice is used image processing software to synthesize an image.At this moment, the decay of laser in mist cone xsect offset by injecting laser from the both sides of nozzle respectively.In addition, while measuring for twice, camera lays respectively at A side-lower and the C side-lower of nozzle, and the method can be proofreaied and correct the measuring error that in the mist cone xsect causing due to camera camera site, local light path difference produces.
Feature of the present invention is to adopt non-intervention type measuring method not affect flow field, adopt fuel oil via Laser-induced Fluorescence Method to carry out fuel distribution measurement and can measure fast and accurately the fuel space distribution in different cross section in mist cone, with respect to planar laser scattering and the Phase Doppler Particle Analyzer based on spot measurement, planar laser induced fluorescence method has improved measuring speed and precision.Fuel oil error calibration method in the present invention has further solved the laser energy attenuation problem that planar laser induced fluorescence method exists in the larger mist cone of concentration of liquid drops, the range of application of having widened fuel oil via Laser-induced Fluorescence Method.
Principle of the present invention: according to the people's such as Baranger research, some aromatics in aviation kerosene (1,2,4-trimethylbenzene, naphthalene, 1-methylnaphthalene and 1,3-dimethylnaphthalene etc.) can send fluorescence under the irradiation of ultraviolet light.As shown in Figure 2, the thickness of sheet laser is h, the mist cone crossing with sheet laser is test section, in test section, area is that the volume of a certain fritter of δ A is δ V=h δ A, from volume be the fluorescent photon number that sends the test section of δ V be with time shutter, sheet light intensity and test section in the molecular number of fluorescent components be directly proportional, suppose that fluorescent components concentration is homogeneous in kerosene, in the test section of the photon number of sending and δ V, the quality of aviation kerosene is directly proportional.The camera exposure time (τ) is certain, suppose that sheet light intensity is homogeneous in whole test section, and volume is that fluorescence signal intensity in the test section of δ V is directly proportional with this local kerosene quality.
The present invention compared with prior art had advantages of:
(1) the present invention adopts non-intervention type measuring method, not interference flowing field.
(2) with respect to the fuel oil collecting method of insertion type and the laser-Doppler particle analyzer based on spot measurement, the present invention can carry out the measurement of fuel distribution transient response, has improved the temporal resolution of measuring.
(3) bearing calibration of fuel space distribution error has solved the laser energy measuring error that decay causes in mist cone, improved laser-induced fluorescence (LIF) fuel space distribution measuring precision, simultaneously, make fuel oil laser fluorescence fuel distribution measuring method for the larger mist cone of concentration of liquid drops, widen the range of application of via Laser-induced Fluorescence Method in fuel space distribution measuring.
Accompanying drawing explanation
Fig. 1 is fuel nozzle mist cone and xsect;
Fig. 2 is fuel space distribution tests optical element of the present invention and testpieces arrangenent diagram;
Fig. 3 is fuel space distribution measuring error correction scheme schematic diagram of the present invention.
Wherein 1 is PC, the 2nd, YAG laser instrument, the 3rd, laser guide arm, the 4th, sheet laser moulding optical element, the 5th, fuel nozzle, the 6th, test section, the 7th, fuel nozzle mist cone, the 8th, optical filter, the 9th, ultraviolet-cameras camera lens, the 10th, image intensifier, the 11st, CCD camera, the 12nd, time synchronized controller, the 13rd, fuel distribution is measured mist cone cross-section location for the first time, the 14th, fuel distribution is measured laser beam and transmit direction for the first time, the 15th, fuel distribution is measured mist cone cross-section location for the second time, the 16th, fuel distribution is measured laser beam and transmit direction for the second time, the 17th, fuel distribution is measured the position after mist cone xsect Rotate 180 ° for the second time, the 18th, fuel distribution is measured mist cone cross sectional image for the first time, the 19th, fuel distribution is measured mist cone cross sectional image for the second time, the 20th, fuel distribution is measured the image after mist cone xsect Rotate 180 ° for the second time, 21 is the mist cone xsect fuel distribution images after 18 and 20 merging.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, invention is further described.
Fig. 2 is fuel space distribution tests optical element of the present invention and testpieces arrangenent diagram, and whole optical measuring system is carried out data acquisition, control and data processing by PC 1.PC 1 is to time synchronized controller 12 transmitting TTL excitation signals, and YAG laser instrument 2 is started working, and the laser beam of sending enters sheet laser moulding optical element 4 by laser guide arm 3, forms the sheet light that thickness is about 1mm, and sheet laser is by test section 6.The fuel oil that fuel nozzle 5 sprays forms mist cone 7, and the tracer agent in mist cone 7 enters excited state under the exciting of sheet laser, sends subsequently fluorescence.Fluorescence signal is separated by optical filter 8 realizations with scattered signal, only has fluorescence signal can pass through ultraviolet lens 9.At time synchronized controller 12, to YAG laser instrument, launch after the certain hour dt of TTL signal, time synchronized controller 12 is simultaneously to image intensifier 10 and CCD camera 11 transmitting TTL signals, the shutter of image intensifier 10 and CCD camera 11 is opened, allow fluorescence signal enter image intensifier 10, fluorescence signal amplifies through image intensifier 10, then enter CCD camera 11, guarantee that CCD collected by camera arrives the clearly relatively weak laser-induced fluorescence (LIF) signal of intensity.
Fig. 3 is fuel space distribution measuring error correction scheme schematic diagram of the present invention.First carry out fuel distribution for the first time and measure, laser 14 is bored by mist from the B side of mist cone xsect 13, by image acquisition, obtains fuel distribution image 18.Then carrying out fuel distribution for the second time measures, nozzle location Rotate 180 °, keep Laser emission direction constant, mist cone xsect 13 becomes mist cone xsect 15, laser 16 is bored by mist from the D side of mist cone xsect, by image acquisition, obtains fuel distribution image 19.Finally carry out post processing of image, first 19 Rotate 180s °, obtain fuel distribution image 20.At this moment, fuel distribution image 20, with respect to the fuel distribution image 18 of measuring for the first time, is exactly from nozzle cross-section 13 both sides B and D, to carry out respectively a fuel distribution measurement respectively.The fuel distribution image 18 of measuring for the first time with measure for the second time and the fuel distribution image of Rotate 180 ° merges, remove the measuring error that laser energy is decayed and caused in mist cone, obtain the fuel distribution image 21 that measuring accuracy is higher.
In addition, it should be noted that, the specific embodiment described in this instructions, the shape of its parts and components, institute's title of being named etc. can be different.All equivalence or simple change of doing according to described structure, feature and the principle of patent design of the present invention, are included in the protection domain of patent of the present invention.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, all should belong to protection scope of the present invention.
Claims (10)
1. a fuel nozzle drop space distribution measuring method, the fuel oil that described fuel nozzle sprays forms mist cone under it, contains spike component in described fuel oil, it is characterized in that, and described measuring method comprises,
--under described fuel nozzle, a distance projects a laser light sheet, described sheet laser is perpendicular to the central shaft of described mist cone, the xsect of described mist cone at the place, locus of sheet laser forms circumferentially test plane of a mist cone, or, described sheet laser is parallel to the central shaft of described mist cone, and the section constitution one mist axis of cone that described mist cone is located in the locus of sheet laser is to test plane;
--when described sheet laser is arranged perpendicular to the central shaft of described mist cone, at described mist cone, circumferentially above the side-lower of test plane or side, arrange an image collecting device, and circumferentially test plane is angled with described mist cone, described image collecting device gathers the fuel distribution image in the circumferential test of described mist cone plane; When described sheet laser is parallel to the central shaft layout of described mist cone, perpendicular to described axial test floor plan one image collecting device, gather the described mist axis of cone to the true fuel distribution image of testing section;
--before the camera lens of described image collecting device, arrange an optical filter, described optical filter, in order to separated scattered signal and fluorescence signal, makes described image collecting device only gather fluorescence signal;
--when described sheet laser is arranged perpendicular to the central shaft of described mist cone, fuel space distribution measuring is carried out to error correction, correction is because of the decay error that to fuel distribution mass measurement produce of laser intensity at mist cone, proofread and correct the mist cone causing due to described image collecting device camera site simultaneously and circumferentially test the measuring error that in plane, local light path difference produces: complete after one-shot measurement, keep image collecting device and trystate parameter to remain unchanged, described fuel nozzle Rotate 180 ° is measured for the second time, the image measuring for the second time be take to fuel nozzle center again as initial point Rotate 180 °, and synthesize an image with the image measuring for the first time,
--analysis image, determine the space distribution situation of drop.
2. fuel nozzle drop space distribution measuring method according to claim 1, it is characterized in that, described method utilizes the aromatics in domestic RP-3 aviation kerosene can emitting fluorescence under ultraviolet excitation, stating ultraviolet wavelength is 266nm, the wavelength coverage 280-360nm of fluorescence signal.
3. fuel nozzle drop space distribution measuring method according to claim 1, is characterized in that, described method can realize the circumferential distribution measuring of fuel nozzle lateral cross section fuel oil.
4. fuel nozzle drop space distribution measuring method according to claim 1, is characterized in that, the time delay intervals that laser device laser transmitting and camera shutter are opened is 390-450ns.
5. fuel nozzle drop space distribution measuring method according to claim 1, it is characterized in that, by in mist cone both sides respectively incident laser carry out twice measurement, then 180 ° of the image rotations measuring are for the second time merged with the image measuring for the first time, eliminate the laser energy measuring error that decay causes in mist cone.
6. fuel nozzle drop space distribution measuring method according to claim 1, is characterized in that, described image collector is set to enhancement mode CCD camera.Preferably, described enhancement mode CCD camera comprises ultraviolet lens, image intensifier, the CCD camera connecting successively.Further preferably, setup times isochronous controller, simultaneously to described image intensifier and CCD camera transmitting TTL signal, is controlled the shutter opening time of described image intensifier and CCD camera.
7. fuel nozzle drop space distribution measuring method according to claim 1, it is characterized in that, the laser beam that described sheet laser is sent by YAG laser instrument enters sheet laser moulding optical element by laser guide arm and forms, and the thickness of described sheet laser is about 1mm.
8. fuel nozzle drop space distribution measuring method according to claim 1, is characterized in that, when described sheet laser is arranged perpendicular to the central shaft of described mist cone, described CCD camera is circumferentially tested plane with described mist cone and become 30-60 degree angle.
9. fuel nozzle drop space distribution measuring method according to claim 1, it is characterized in that, when described sheet laser perpendicular to or the central shaft that is parallel to described mist cone while arranging, need to carry out background correction, eliminate the impact on fuel space distribution measuring of visible ray in surrounding environment.
10. one kind in order to implement the test unit of the fuel distribution optical measurement of measuring method described in the claims, comprise fuel nozzle, sheet laser forms device, image collecting device, it is characterized in that, the fuel oil that described fuel nozzle sprays forms mist cone under it, described sheet laser forms device and under described fuel nozzle, projects a sheet laser, described sheet laser is perpendicular to the central shaft of described mist cone, the xsect of described mist cone at the place, locus of sheet laser forms circumferentially test plane of a mist cone, or, described sheet laser is parallel to the central shaft of described mist cone, the section constitution one mist axis of cone that described mist cone is located in the locus of sheet laser is to test plane, when described sheet laser is arranged perpendicular to the central shaft of described mist cone, at described mist cone, circumferentially above the side-lower of test plane or side, arrange an image collecting device, and circumferentially test plane is angled with described mist cone, when described sheet laser is parallel to the central shaft layout of described mist cone, perpendicular to described axial test floor plan one image collecting device, before the camera lens of described image collecting device, arrange an optical filter, described test unit also comprises control device and the time synchronized controller of mutual communication connection, and described time synchronized controller communicates to connect described sheet laser and forms device and image collecting device.
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