A Quantitative Test System for Equivalent Ratio of Liquid Phase Fuel in Spray Section
A liquid-phase fuel and testing system technology, applied in the direction of scattering characteristic measurement, etc., can solve the problem of single limitation of the experimental object, and achieve the effect of simple and fast optical path layout, wide adjustment range, and fast transient response
Active Publication Date: 2021-11-19
XI AN JIAOTONG UNIV
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Problems solved by technology
Laser Absorption Scattering (LAS) can obtain the fuel equivalence ratio of gas phase and liquid phase at the same time, but this test technology is based on the assumption of a single-beam ideal spray cone to post-process the spray pictures, and the applicable experimental objects are relatively single and have a large limitations
In actual engines, multiple oil beams and non-ideal symmetrical spray structures are often used to broaden the spatial distribution range of spray oil beams inside the combustion chamber. At present, there is still a lack of effective optical diagnostic methods to quantitatively measure the spray cross-section liquid for the above-mentioned actual complex spray structures. Test system for phase fuel equivalence ratio
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] Such as figure 1 As shown, the present invention provides a quantitative test system for the equivalence ratio of liquid-phase fuel in a spray section, including a fuel tank 1, a filter 2, an electric fuel pump 3, a pressure transmitter 4, an injector driver 5, and a signal delay Trigger 6, CCD double exposure camera 7, image post-processing host computer 8, Zeuch fuel injection rate measuring instrument 9, Nd:YAG double pulse laser 10, sheet light shaper 11, constant volume cavity 12, temperature control adapter 13, and fuel injector 14. According to specific functions, it can be divided into: fuel injection pressure establishment module, trigger signal synchronization module, mechanical structure installation module, optical diagnosis module, fuel injection rate measurement module and data post-processing module.
[0032] The main function of the f...
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The invention discloses a quantitative test system for the equivalence ratio of the liquid phase fuel in the spray section. The side of the injector is installed in the constant volume cavity, the cross-section of the spray body is cut by the double-pulse laser sheet, and the Mie scattering signal is collected by the double-exposure camera. Signal delay triggers coordinate fuel injection, laser and camera timing relationships. The injection mass within the calculated pulse interval is measured by Zeuch piezomagnetic method, combined with the cross-sectional light intensity distribution to obtain the quantitative spatial distribution of the liquid-phase fuel equivalence ratio. The invention provides a quantitative test system for the equivalence ratio of liquid-phase fuel in the spray section. The test system has a fast time response speed, a wide spatial measurement range, simple and fast optical path arrangement, and is suitable for diagnosing the spatial distribution of the atomization effect of non-evaporative porous sprays. .
Description
technical field [0001] The invention belongs to the field of spray optical diagnosis, and in particular relates to a quantitative test system for the equivalence ratio of liquid-phase fuel in a spray section. Background technique [0002] Spraying is the process of breaking liquid fuel under the combined action of aerodynamic force, inertial force, and surface tension, forming small-sized droplets, accelerating fuel evaporation and finally forming a combustible mixture. Leading process for efficiency and pollutant emission levels. The equivalence ratio of the fuel reflects the relative content relationship between the combustible mixture formed by atomization and the oxidant. It is defined as the ratio of the amount of air required by the complete combustion theory to the amount of air actually supplied. An equivalence ratio of less than 1 indicates excess air. Accurately measure the fuel equivalence ratio distribution at different spatial positions inside the combustion ch...
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IPC IPC(8): G01N21/53
Inventor 詹铖姚晓新汤成龙黄佐华
Owner XI AN JIAOTONG UNIV