Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
EFFECT OF NOZZLE HOLE GEOMETRY ON NON-EVAPORATING DIESEL SPRAY CHARACTERISTICS AT HIGH-PRESSURE INJECTION
RÉSUMÉ
Non-evaporating diesel sprays from a common-rail injection system were characterized to investigate the effect of nozzle hole geometry. Two valve covered orifice (VCO) injectors with cylindrical and tapered nozzle holes were used. The injection rate was measured using an injection rate meter via the Bosch tube method. The spray tip penetration was analyzed from macroscopic spray images in a constant volume chamber using a high-resolution charge-coupled device camera and a spark light. Spray characteristics near the nozzle hole exit were observed using a microscopic visualization technique. The velocity and size of the droplets were measured downstream using a phase Doppler anemometer system. At the initial stage, the slope of the injection velocity from the tapered nozzle hole was larger than that from the cylindrical nozzle hole at the same injection pressure. The maximum injection velocity from the tapered nozzle hole was also higher. Until the micro-spray cone angle reached a maximum value, the spray tip penetration of the two nozzles increased with the change of injection rate. Subsequently, the spray tip penetration increased linearly with time. At the initial stage, the length of the liquid column injected from the tapered nozzle hole was about twice as long as that from the cylindrical nozzle hole. During the injection period, the oscillation in the micro-spray angle of the tapered nozzle hole was smaller than that of the cylindrical nozzle hole. The velocity and size of a droplet downstream with the tapered nozzle hole were slower and smaller than the velocity and size of the cylindrical nozzle hole.
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Tang Chenglong, Feng Zehao, Zhan Cheng, Ma Wen'an, Huang Zuohua, Experimental study on the effect of injector nozzle K factor on the spray characteristics in a constant volume chamber: Near nozzle spray initiation, the macroscopic and the droplet statistics, Fuel, 202, 2017. Crossref
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Ghorbani Morteza, Alcan Gokhan, Sadaghiani Abdolali Khalili, Mohammadi Ali, Unel Mustafa, Gozuacik Devrim, Koşar Ali, Characterization and pressure drop correlation for sprays under the effect of micro scale cavitation, Experimental Thermal and Fluid Science, 91, 2018. Crossref
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Wu Shengqi, Gandhi Anand, Li Hongjiang, Meinhart Mark, Experimental and numerical study of the effects of nozzle taper angle on spray characteristics of GDI multi-hole injectors at cold condition, Fuel, 275, 2020. Crossref
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Markov Vladimir, Sa Bowen, Kamaltdinov Vyacheslav, Neverov Vsevolod, Zherdev Anatoly, Investigation on the effect of the flow passage geometry of diesel injector nozzle on injection process parameters and engine performances, Energy Science & Engineering, 10, 2, 2022. Crossref
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Subramanian Narayanan, Kasimani Ramesh, Effects of antioxidant additive and injector hole number on combustion phenomenon of DI diesel engine operating with kapok methyl ester blends , Environmental Progress & Sustainable Energy, 41, 5, 2022. Crossref