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Li Yaopeng

Recommended Ph.D.Supervisor Recommended MA Supervisor

Personal Information

Supervisor of Doctorate Candidates

Master Tutor

Gender:Male

Alma Mater:大连理工大学

Degree:Doctoral Degree

School/Department:能源与动力学院

Discipline:Power Engineering and Engineering Thermophysics

Business Address:能源与动力学院809室

E-Mail:liyaopeng@dlut.edu.cn

Numerical simulation of cyclic variability in reactivity-controlled compression ignition combustion with a focus on the initial temperature at intake valve closing

Date:2019-11-04  Hits:

Indexed by:期刊论文

Journal:INTERNATIONAL JOURNAL OF ENGINE RESEARCH

Included Journals:SCIE、EI

Volume:16

Issue:3,SI

Page Number:441-460

ISSN No.:1468-0874

Key Words:Reactivity-controlled compression ignition; cyclic variations; multi-dimensional simulation; octane number; cetane number; low-temperature combustion; methanol

Abstract:Cyclic variations in dual-fuel reactivity-controlled compression ignition combustion were investigated using multidimensional simulations of a light-duty diesel engine. By comparing results with measured pressure traces from 300 consecutive cycles, it was found that the standard deviation of the 50% burn point in reactivity-controlled compression ignition combustion could be satisfactorily reproduced by monitoring the sensitivity of the 50% burn point to changes in initial in-cylinder temperature at intake valve closing in the simulations. Using this approach, the influences of fuel reactivity, diesel mass fraction, combustion mode, exhaust gas recirculation rate, intake pressure, and injection strategy on combustion stability were investigated. It was found that diesel/methanol reactivity-controlled compression ignition combustion exhibits larger cyclic variations than diesel/gasoline at the same operating conditions due to the lower reactivity of methanol. Compared to gasoline homogeneous charge compression ignition and diesel partially premixed combustion, diesel/gasoline reactivity-controlled compression ignition combustion showed the lowest cyclic variations for a given 50% burn point. When the 50% burn point was kept constant by adjusting the intake temperature, the introduction of exhaust gas recirculation and an increase in intake pressure resulted in decreased cyclic variations. Under the conditions tested in this study, with the employment of retarded injection timing, single injection, and increased injection pressure, the in-cylinder equivalence ratio becomes richer, which is helpful for the reduction in cyclic variations in reactivity-controlled compression ignition combustion. The overall results indicate that the present approach for describing cyclic variability is useful for practical applications.

Date of Publication:2015-04-01

Pre One:Evaluation of the necessity of exhaust gas recirculation employment for a methanol/diesel reactivity controlled compression ignition engine operated at medium loads Next One:Construction of Skeletal Oxidation Mechanisms for the Saturated Fatty Acid Methyl Esters from Methyl Butanoate to Methyl PaImitate