Simulation and Experimental Study on Urea Spray Characteristics for SCR System of Vehicle Diesel Engine

LIU Lei; DENG Chenglin

doi:10.3969/j.issn.10012222.2018.05.002

Vehicle Engine >

2018 , Vol. 0 >Issue 5: 8 - 13

DOI: https://doi.org/10.3969/j.issn.10012222.2018.05.002

Simulation and Experimental Study on Urea Spray Characteristics for SCR System of Vehicle Diesel Engine

LIU Lei ,
DENG Chenglin

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（1.State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China；2.Institute of Logistics Science and Technology,Beijing 100071,China）

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Abstract

By establishing threedimensional CFD simulation model of injection system, the variation laws of spray velocity flow field, atomization particle size, spray shape and penetration distance for the urea injection in the SCR system of diesel engine under airassisted atomization conditions were studied. The structural parameters such as orifice diameter of SCR system were optimized according to the injection model. The atomization performance of reductant was verified by the ESC and ETC tests. The test results show that NO_x emission and NH₃ leakage of diesel engine meet the China Ⅴ stage emission regulations after using the improved supply system of airassisted injecting reductant, which proves that the simulation and optimization method of spray characteristics is effective and feasible.

Key words： diesel engine; SCR; air assisted atomization；spray characteristics

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LIU Lei , DENG Chenglin . Simulation and Experimental Study on Urea Spray Characteristics for SCR System of Vehicle Diesel Engine[J]. Vehicle Engine, 2018 , 0(5) : 8 -13 . DOI: 10.3969/j.issn.10012222.2018.05.002

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