Experimental Study of Influence of Outlet Pressure on Discharge Characteristics of Diesel Injector

doi:10.3969/j.issn.1000-1093.2015.05.002

Abstract

Abstract: The high-speed flow of fuel in the injector of the high pressure fuel system for the diesel engine is easy to induce the cavitation in nozzles, which affects the injection characteristics. A set of test rigs is built to adjust the different outlet pressures for the study of the influence of outlet pressure on the discharge characteristics of injector. The injection characteristics of a high-pressure common-rail under different injection and outlet pressures are measured to investigate the influence of outlet pressure on fuel delivery rate. The test results show that the outlet pressure has little influence on the fuel delivery rate at the constant injection pressure; but as the flow chokes due to cavitation, the discharge coefficient increases with the increase in the outlet pressure.

Key words: power machinery engineering, diesel engine, fuel injector, cavitation, outlet pressure

CLC Number:

TK421⁺.5

QIU Tao， FENG Xiang， LEI Yan， DAI He-fei， XU Hui， ZHANG Chuan-xia. Experimental Study of Influence of Outlet Pressure on Discharge Characteristics of Diesel Injector[J]. Acta Armamentarii, 2015, 36(5): 777-780.

References

［1］何志霞，钟汶君，黄云龙，等. 针阀运动对柴油机喷嘴瞬态流动特性的影响［J］. 内燃机学报，2012，30（4）：337-342.
HE Zhi-xia，ZHONG Wen-jun，HUANG Yun-long, et al. Investigation of transient behavior of cavitation flow in injector nozzles affected by the needle movement［J］. Transactions of CSICE, 2012, 30(4): 337-342.(in Chinese)
［2］何志霞，柏金，王谦，等. 柴油机喷嘴内空穴流动可视化试验与数值模拟［J］.农业机械学报，2011，42（11）：6-9.
HE Zhi-xia，BAI Jin，WANG Qian，et al. Visualization experiment and numerical simulation for cavitating flow in a diesel injector nozzle［J］. Transactions of the Chinese Society for Agricultural Machinery, 2011, 42(11): 6-9. (in Chinese)
［3］张军，杜青，杨延相，等. 柴油机不同类型喷嘴内部空化流动特性的研究［J］.内燃机学报，2010，28（2）：134-140.
ZHANG Jun，DU Qing，YANG Yan-xiang, et al. Study on cavitating flow in different types of diesel nozzle orifice［J］. Transactions of CSICE, 2010，28（2）：134-140.(in Chinese)
［4］王忠远，孙剑，董庆兵，等. 柴油机喷孔内部空化效应的可视化实验研究［J］.燃烧科学与技术，2012，18（3）：281-287
WANG Zhong-yuan，SUN Jian，DONG Qing-bing, et al. Visualization of cavitation in diesel nozzle orifice［J］. Journal of Combustion Science and Technology, 2012, 18(3):281-287.(in Chinese)
［5］ Payri R, Salvador F J, Gimeno J,et al. Study of cavitation phenomena based on a technique for visualizing bubbles in a liquid pressurized chamber［J］.International Journal of Heat and Fluid Flow, 2009,30(4):768-777.
［6］ Schmidt D P，Su T F，Goney K H, et al. Detection of cavitation in fuel injector nozzles［C］∥8th ISTP Conference. San Francisco：ISTP，1995：1995-10.
［7］徐家龙.柴油机电控喷油技术［M］.北京：人民交通出版社，2011.
XU Jia-long. Diesel engines electric injection technology［M］.Beijing：China Communications Press，2011.（in Chinese）
［8］ Payri R，Salvador F J，Gimeno J，et al. Diesel nozzle geometry influence on spray liquid-phase fuel penetration in evaporative conditions［J］. Fuel，2008，87(7)：1165-1176.

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