Computational study of nozzle spray-line distribution effects on stratified mixture formation, combustion and emissions of a high compression ratio DISI methanol engine under lean-burn condition. (15th August 2020)

• Record Type: Journal Article
• Authors: Gong, Changming; Zhang, Zilei; Sun, Jingzhen; Chen, Yulin; Liu, Fenghua
• Is Part Of: Energy. Volume 205(2020)
• Publication Date: 2020-08-15
• Subjects: Direct injection spark ignition methanol engine -- High compression ratio -- Nozzle spray-line distribution -- Stratified mixture formation -- Combustion -- Emissions; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.118080
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: In this paper, five different spray-line distribution nozzles were designed to evaluate the effect of the nozzle spray-line distribution on stratified-charge combustion of methanol engine. Nozzle spray-line distribution characteristics, the stratified mixture formation, combustion and emissions of a high compression ratio direct-injection spark-ignition methanol engine for different spray-line distribution nozzles under lean-burn condition were numerically simulated. Simulation results showed that a non-uniform spray-line distribution nozzle of a 10-hole × 0.30 mm was conducive to form an ideal stratified mixture and obtain better combustion and engine performance. The maximum in-cylinder pressure of nozzle A was approximately 50.5% higher than that of nozzle E. The ignition delay and combustion duration of nozzle A were approximately both 20% lower than nozzle E. Nozzle A had lower unburned methanol, CO and soot emissions. The nozzle order of the highest NO emission was: A ≫ B > C > D > E. NO emission of nozzle A was approximately 13.6 times higher than that of nozzle E. According to the combustion and emission performance tradeoff, the nozzle order was: A > B > D > C > E. Nozzle A was preferred for actual spark ignition methanol engine applications. Highlights: Nozzle spray-line distribution is numerically studied under lean burn conditions. High compression ratio is used in direct-injection spark-ignition methanol engine. Non-uniform spray-line nozzle is favor to form methanol-air stratified mixture. Non-uniform spray-line nozzle of a 10-hole × 0.30 mm has a faster combustion process. Ideal stratified mixture nozzle has lower unburned methanol, CO and soot emissions.