Spray -field optical testing technology of modern technology has been spray -field test is a powerful tool in the study of the combustion engine . In recent years, as the representative of the laser optical testing technology, making the study of highly turbulent spray of diesel oil and gas mixing process possible. In order to deepen the understanding of the spray nozzle working process , exploring burning mechanism , people spray field study conducted various tests , following its typical testing techniques are introduced.

( 1 ) Phase Doppler Particle velocimetry (PDPA) Laser Phase Doppler Particle velocimetry (Phase Doppler ParticleAnalyzer), which is a laser-based interferometric technique , so that the scattered light in different parts of the acceptance of light, they can quantitative determination of flow retardation due to the relative and absolute luminance PDPA laser beam is not sensitive , it can measure smaller droplets , and the droplets can handle a wide range of speeds. Eroglu and Chigier coaxial jet injector point in the vicinity of a Breakup PDPA measurement , systematic observation of the spray nozzle forms under different injection pressure .

( 2 ) Fraunhofer diffraction Fraunhofer diffraction technique using Fraunhofer diffraction effects arising from the droplets to get somewhere in a certain particle size of the spray volume as a percentage of the volume of all the particles and other information . With Phase Doppler technology, Fraunhofer diffraction technology can only spray a small area of the field particle size measurement. That is, compared with the overall scale of the spray , both of which can give fog test techniques in the field of particle measurement results of a point , but can not give information on the particle size distribution of the audience .

( 3 ) Laser Induced Fluorescence (LIF) laser-induced fluorescence spectroscopy LIF (Laser Induced Fluorescence) is an effective means of measuring the concentration distribution of the spray . Application of a sheet of laser irradiation LIF , or rely on fuel in the fuel itself is added to the laser measuring fluorescence fluorescent agent , can be observed , the fuel concentration distribution , the configuration of the high-resolution CCD camera can also observe the motion of the droplet and particle distribution . China Tianjin University research undertaken in this area earlier , but also achieved remarkable results.

 

Spray -field optical testing technology of modern technology has been spray -field test is a powerful tool in the study of the combustion engine . In recent years, as the representative of the laser optical testing technology, making the study of highly turbulent spray of diesel oil and gas mixing process possible. In order to deepen the understanding of the spray nozzle working process , exploring burning mechanism , people spray field study conducted various tests , following its typical testing techniques are introduced.

( 1 ) Phase Doppler Particle velocimetry (PDPA) Laser Phase Doppler Particle velocimetry (Phase Doppler ParticleAnalyzer), which is a laser-based interferometric technique , so that the scattered light in different parts of the acceptance of light, they can quantitative determination of flow retardation due to the relative and absolute luminance PDPA laser beam is not sensitive , it can measure smaller droplets , and the droplets can handle a wide range of speeds. Eroglu and Chigier coaxial jet injector point in the vicinity of a Breakup PDPA measurement , systematic observation of the spray nozzle forms under different injection pressure .

( 2 ) Fraunhofer diffraction Fraunhofer diffraction technique using Fraunhofer diffraction effects arising from the droplets to get somewhere in a certain particle size of the spray volume as a percentage of the volume of all the particles and other information . With Phase Doppler technology, Fraunhofer diffraction technology can only spray a small area of the field particle size measurement. That is, compared with the overall scale of the spray , both of which can give fog test techniques in the field of particle measurement results of a point , but can not give information on the particle size distribution of the audience .

( 3 ) Laser Induced Fluorescence (LIF) laser-induced fluorescence spectroscopy LIF (Laser Induced Fluorescence) is an effective means of measuring the concentration distribution of the spray . Application of a sheet of laser irradiation LIF , or rely on fuel in the fuel itself is added to the laser measuring fluorescence fluorescent agent , can be observed , the fuel concentration distribution , the configuration of the high-resolution CCD camera can also observe the motion of the droplet and particle distribution . China Tianjin University research undertaken in this area earlier , but also achieved remarkable results.