Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
VISUALIZATION INVESTIGATIONS OF FLOW REGIMES IN DIFFERENT SIZES OF DIESEL INJECTOR NOZZLES AND THEIR EFFECTS ON SPRAY
RÉSUMÉ
This study focused on scale effects on the in-nozzle flow regimes based on different scaled-up diesel injector nozzles, and the influences of the various flow regimes on spray characteristics. Optical results showed that flow regimes inside three different sizes of diesel nozzles went through single-phase flow, cavitation inception, cavitation shedding, wake cavitation, air suction, super cavitation, and hydraulic flip flow. Then the flow regime transition characteristics in three nozzles were analyzed. Cavitation inception number (K) in these nozzles were not the same because of the scale effect. Mean-while, the average cavitation shedding frequency decreased with the increasing of the scaling factor of the nozzle, but the modified Strouhal number (St) was almost the same. Moreover, the decrease of the cavitation number (K) caused the reduction of the average frequencies of cavitation shedding and air suction. In addition, the length of cavitation region showed a strong inverse correlation with the length of air suction region. The collapse of air suction, which was mixed with the cavitation or was pushed out the orifice rapidly, significantly influenced the spray cone angle. The characteristics of various flow regimes in different scaled-up diesel injector nozzles were analyzed in this study, which provided preliminary exploration to the in-nozzle flow characteristics from the scaled-up transparent diesel nozzles to real diesel nozzles.
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Guo Genmiao, He Zhixia, Lai Ming-Chia, Duan Xiongbo, Leng Xianyin, Duan Lian, Chen Zhou, Optical experiment and Large Eddy Simulation on effects of in-nozzle stagnant air bubbles and diesel on near-nozzle spray structure variation in diesel injector, Fuel, 255, 2019. Crossref
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Duan Xiongbo, Li Yangyang, Liu Yiqun, Liu Jingping, Wang Shuqian, Guo Genmiao, Quantitative investigation the influences of the injection timing under single and double injection strategies on performance, combustion and emissions characteristics of a GDI SI engine fueled with gasoline/ethanol blend, Fuel, 260, 2020. Crossref
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Zhang Shiheng, Duan Xiongbo, Liu Yiqun, Guo Genmiao, Zeng Haibo, Liu Jingping, Lai Ming-Chia, Talekar Apoorv, Yuan Zhipeng, Experimental and numerical study the effect of combustion chamber shapes on combustion and emissions characteristics in a heavy-duty lean burn SI natural gas engine coupled with detail combustion mechanism, Fuel, 258, 2019. Crossref
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Duan Xiongbo, Lai Ming-Chia, Jansons Marcis, Guo Genmiao, Liu Jingping, A review of controlling strategies of the ignition timing and combustion phase in homogeneous charge compression ignition (HCCI) engine, Fuel, 285, 2021. Crossref
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Guan Wei, He Zhixia, Zhang Liang, EL-Seesy Ahmed I., Wen Liming, Zhang Quanfu, Yang Li, Effect of asymmetric structural characteristics of multi-hole marine diesel injectors on internal cavitation patterns and flow characteristics: A numerical study, Fuel, 283, 2021. Crossref
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Guo Genmiao, He Zhixia, Wang Qian, Lai Ming-Chai, Zhong Wenjun, Guan Wei, Wang Jiangquan, Numerical investigation of transient hole-to-hole variation in cavitation regimes inside a multi-hole diesel nozzle, Fuel, 287, 2021. Crossref
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Yang Shangze, Wang Shangning, Sun Zhe, Li Xuesong, Hung David L.S., Xu Min, In-nozzle bubble formation and its effect on fuel jet breakup under cavitating and flash boiling conditions, Applied Thermal Engineering, 183, 2021. Crossref
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Chen Chen, Yu Shenghao, Yin Bifeng, Bi Qinsheng, Jia Hekun, Investigation of inner flow and near-field spray patterns of the non-circular diesel injector, Sādhanā, 47, 1, 2022. Crossref