Personal HomePage

+

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

Evaluation of the necessity of exhaust gas recirculation employment for a methanol/diesel reactivity controlled compression ignition engine operated at medium loads

Date:2019-11-04  Hits:

Indexed by:Journal Papers

Journal:ENERGY CONVERSION AND MANAGEMENT

Included Journals:SCIE、EI

Volume:101

Page Number:40-51

ISSN No.:0196-8904

Key Words:Reactivity controlled compression ignition (RCCI); Methanol/diesel dual fuel; Exhaust gas recirculation (EGR); Methanol fraction; Critical initial temperature

Abstract:Three-dimensional computational fluid dynamics simulation was conducted to investigate the improvement of engine performance by managing exhaust gas recirculation rate and methanol fraction in a methanol/diesel reactivity controlled compression ignition engine. By defining fuel efficiency and ringing intensity as the restricted boundaries, the operating ranges of exhaust gas recirculation rate and methanol fraction under various initial temperatures were determined to simultaneously achieve high fuel economy and avoid engine knock. The results indicated that the fuel efficiency and ringing intensity were dominantly affected by the combustion phasing, and they was nearly insensitive to the variations of exhaust gas recirculation rate and initial temperature at a constant combustion phasing. The necessity of exhaust gas recirculation employment at medium loads was dependent on the level of initial temperature. VVhen initial temperature was less than the critical value (380 K in this study), optimal engine performance could be achieved by only adopting high methanol fraction without introducing exhaust gas recirculation. Once initial temperature was beyond the critical value, exhaust gas recirculation was imperative to avoid excessive ringing intensity. Through simultaneously optimizing methanol fraction and exhaust gas recirculation rate, the combined strategy exhibited more advantages in fuel efficiency, nitrogen oxides, and ringing intensity under a wide range of initial temperature. (C) 2015 Elsevier Ltd. All rights reserved.

Date of Publication:2015-09-01

Pre One:Development of a skeletal mechanism for diesel surrogate fuel by using a decoupling methodology Next One:Numerical simulation of cyclic variability in reactivity-controlled compression ignition combustion with a focus on the initial temperature at intake valve closing