The influence of injection parameters on the overall performance of the marine inlet jet methanol engine
XU Xiaoying
YOU Kai
YAN Lu
CHI Hao
SHEN Fuchao
FANG Hua
CHEN Ning
Abstract：In order to study the overall performance of a marine methanol engine modified from a natural gas engine,Converge software is used for 3D fluid simulation to analyze the effects of nozzle parameters and methanol rail pressure on methanol atomization.GT-Power is used for one-dimensional simulation analysis to investigate the influence of valve timing on engine intake and exhaust performance,and the optimal simulation parameter combinations is selected.Combined with bench tests,the optimal injection end timing selection and overall performance verification are carried out.The results show that the best parameters combinations are 16 injection holes,0.27 mm diameter of the injection holes,600 kPa rail pressure,344° intake valve open,570° intake valve closed,104° exhaust valve open,and 409° exhaust valve closed,12.0 mm maximum lift of the intake valve,13.5 mm maximum lift of the exhaust valve.When the crankshaft angle is 330° at the end of injection,the minimum methanol consumption rate corresponding to the calibration conditions of the engine under two different uses is 433.2 g/(kW·h)and 426.5 g/(kW·h),which meets the target requirement of a minimum methanol consumption rate of less than 440 g/(kW·h)in the product development.
Keywords：methanol engineinjection endmethanol consumption raterail pressurevalve timing
Publication Date：2025-03-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 45-52 )