内燃机工程2017，Vol.38Issue(2)：36-41,6.DOI:10.13949/j.cnki.nrjgc.2017.02.007
甲醇预混合气F-T柴油引燃模式下发动机燃烧特性研究
Study on Combustion Characteristics of Methanol/F-T Fuel Dual Fuel Engine with Pilot Injection
摘要
Abstract
In order to use the advantage of F-T fuel and methanol in improving the energy conversion efficiency of methanol, the effect of methanol/diesel energy ratio and F-T fuel injection timing on combustion characteristics was investigated on a CY25TQ diesel engine.The mixture of methanol and air was induced into cylinder from the intake port, and ignited by pilot F-T fuel.Experimental results show that the ignition delay and combustion duration would fluctuate greatly with the increase of methanol/diesel energy ratio.When the brake mean effective pressure is 0.45MPa, the maximum cylinder pressure, the peak value of instantaneous heat release rate and the maximum pressure rise rate are significantly lower with a maximum drop of 26.40%, 59.25% and 58.00% respectively.At high load operation, the pilot fuel injection timing can promote the further reduction of pressure rise rate in different methanol/diesel energy ratio.Although the effective thermal efficiency of dual fuel engine with pilot injection than that of the original diesel engine with diffusion combustion mode at low and middle loads, however, with the increase in load, the thermal efficiency of the duel fuel engine is higher than that of the original diesel engine at high load, which leads to the increase in the maximum thermal efficiency of the engine by 17.14%.关键词
内燃机/甲醇空气预混合气/F-T柴油引燃/F-T柴油喷油时刻/甲醇占能比/燃烧特性Key words
IC engine/mixture of methanol and air/pilot F-T fuel/F-T fuel injection timing/methanol/diesel energy ratio/combustion characteristics分类
能源科技引用本文复制引用
苏志伟,朱建军,安俏俏,高聪慧,韩卫,王乐..甲醇预混合气F-T柴油引燃模式下发动机燃烧特性研究[J].内燃机工程,2017,38(2):36-41,6.基金项目
清华大学汽车安全与节能国家重点实验室开放基金项目(KF14082) （KF14082）
