A fuel jet flow concentration field distribution testing device and an implementing method thereof

Abstract

A fuel jet flow concentration field distribution testing device belonging to the technical field of concentration field testing and an implementing method thereof are disclosed. The device comprises a laser, a frequency doubler, total reflection prisms, a disk laser generating lens group, a constant volume bomb system, a plane mirror, a filter mirror and a fluorescence signal detector. The device generates collimating laser signals by adopting the laser, collimating laser signals of a corresponding wavelength are obtained through the frequency doubler, the light path is changed through the first and second total reflection prisms so as to allow entrance into the disk laser generating lens group, collimating light is converted into disk light through the disk laser generating lens group, the disk light is emitted into a constant volume bomb to induce tracer particles to generate fluorescence, the fluorescence is captured through the fluorescence signal detector to generate a two-dimension fluorescence image after the light path of the fluorescence is changed through the plane mirror and the fluorescence is then filtered through the filter mirror, the generated image is divided into n grids, and the quantitative fuel mist concentration distribution is obtained by numerical calculation through a correlation between calibrated concentrations and light intensity. Test conditions of the device and the method are close to those of practical internal combustion engines. The device and the method have guiding significance for future internal combustion engine development.

Description

technical field [0001] The invention relates to a test device in the technical field of concentration field test, in particular to a test device for concentration field distribution of fuel jet by laser-induced fluorescence method and an implementation method thereof. Background technique [0002] In recent years, in the development of internal combustion engine technology, in order to better control fuel combustion efficiency and emissions, the concentration distribution field of fuel spray before internal combustion engine combustion is very important. If the concentration of fuel spray can be quantitatively determined The distribution has a good reference value for spray control and combustion chamber design. Compared with the probe method, the optical diagnosis method of the internal combustion engine has the advantage of not disturbing the local flow field, especially the planar laser-induced fluorescence (PLIF) method can quantitatively display the concentration distri...

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Problems solved by technology

[0003] In order to solve the problems that the traditional PLIF is difficult to operate and the calibration method is uncertain, the present invention provides an implementation device for testing the concentration field distribution of fuel jets, and uses the device to invent a method for testing the concentration field distribution of fuel jets , this method adds tracer into the atmosphere, and only needs to change the concentration of tracer in the atmosphere when calibrating, and the calibration image and calculation image are obtained by taking two interval shots in the same experiment process, which is reduced compared with the traditional method The difficulty of operation and the uncertainty of calculating the calibration coefficient K

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