A simulation model of an electronically controlled two solenoid valve fuel injection system for a diesel engine is established in the AMESim environment.The accuracy of the model is validated through comparison with e...A simulation model of an electronically controlled two solenoid valve fuel injection system for a diesel engine is established in the AMESim environment.The accuracy of the model is validated through comparison with experimental data.The influence of pre-injection control parameters on main-injection quantity under different control modes is analyzed.In the spill control valve mode,main-injection fuel quantity decreases gradually and then reaches a stable level because of the increase in multi-injection dwell time.In the needle control valve mode,main-injection fuel quantity increases with rising multi-injection dwell time;this effect becomes more obvious at high-speed revolutions and large main-injection pulse widths.Pre-injection pulse width has no obvious influence on main-injection quantity under the two control modes;the variation in main-injection quantity is in the range of 1 mm3.展开更多
针对航空煤油发动机在中低负荷工况动力特性差以及燃烧稳定性差难以满足起飞要求这两个突出问题,以自主研发的低压空气辅助直喷航空煤油发动机及其试验系统为平台,采用试验设计(design of experiment,DOE)方法,对喷气脉宽、喷气压力、...针对航空煤油发动机在中低负荷工况动力特性差以及燃烧稳定性差难以满足起飞要求这两个突出问题,以自主研发的低压空气辅助直喷航空煤油发动机及其试验系统为平台,采用试验设计(design of experiment,DOE)方法,对喷气脉宽、喷气压力、油气间隔、二次喷射等多个喷油控制参数进行了主效应及交互作用分析,并根据主效应及交互作用顺序进行了多喷油参数协同控制,开展了对航空煤油发动机动力性及燃烧特性影响的试验探究.结果表明:随着喷气脉宽增加,燃烧速度逐渐加快,排温持续下降,动力性及燃烧稳定性逐渐提升.喷气压力与喷气脉宽协同控制能够有效提升发动机整体性能,在喷气压力550 kPa、喷气脉宽5 ms时,平均有效压力(indicated mean effective pressure,IMEP)达到当前最大值529 kPa,燃烧质量最佳.随着油气间隔逐渐增大,各喷气压力条件下发动机动力性及燃烧稳定性均呈先提升后减小趋势,油气间隔与喷气压力协同控制能够在最佳喷气脉宽条件下进一步提升发动机整体性能,且存在最佳油气间隔为1.5 ms.在最佳油气间隔与喷气脉宽条件下,二次喷射与喷气压力协同控制能够进一步使发动机动力特性最大提升11.3%、燃烧稳定性最大增强23%,排温降至最低702℃,使航空煤油发动机动力特性以及燃烧稳定性得到有效提升.展开更多
基金Supported by the Program for New Century Excellent Talents in University（NECT-11-0826） the National Natural Science Foundation of China（NSFC 51279037）+1 种基金 the Fundamental Research Funds for the Central Universities（HEUCFZ13） the Postdoctoral Science-research Developmental Foundation of Heilongjiang Province（LBH-Q12126）Acknowledgement The authors gratefully acknowledge vice Professor Yong Shi and Jun Sun＇s help in fuel injection experiment.
文摘A simulation model of an electronically controlled two solenoid valve fuel injection system for a diesel engine is established in the AMESim environment.The accuracy of the model is validated through comparison with experimental data.The influence of pre-injection control parameters on main-injection quantity under different control modes is analyzed.In the spill control valve mode,main-injection fuel quantity decreases gradually and then reaches a stable level because of the increase in multi-injection dwell time.In the needle control valve mode,main-injection fuel quantity increases with rising multi-injection dwell time;this effect becomes more obvious at high-speed revolutions and large main-injection pulse widths.Pre-injection pulse width has no obvious influence on main-injection quantity under the two control modes;the variation in main-injection quantity is in the range of 1 mm3.
文摘针对航空煤油发动机在中低负荷工况动力特性差以及燃烧稳定性差难以满足起飞要求这两个突出问题,以自主研发的低压空气辅助直喷航空煤油发动机及其试验系统为平台,采用试验设计(design of experiment,DOE)方法,对喷气脉宽、喷气压力、油气间隔、二次喷射等多个喷油控制参数进行了主效应及交互作用分析,并根据主效应及交互作用顺序进行了多喷油参数协同控制,开展了对航空煤油发动机动力性及燃烧特性影响的试验探究.结果表明:随着喷气脉宽增加,燃烧速度逐渐加快,排温持续下降,动力性及燃烧稳定性逐渐提升.喷气压力与喷气脉宽协同控制能够有效提升发动机整体性能,在喷气压力550 kPa、喷气脉宽5 ms时,平均有效压力(indicated mean effective pressure,IMEP)达到当前最大值529 kPa,燃烧质量最佳.随着油气间隔逐渐增大,各喷气压力条件下发动机动力性及燃烧稳定性均呈先提升后减小趋势,油气间隔与喷气压力协同控制能够在最佳喷气脉宽条件下进一步提升发动机整体性能,且存在最佳油气间隔为1.5 ms.在最佳油气间隔与喷气脉宽条件下,二次喷射与喷气压力协同控制能够进一步使发动机动力特性最大提升11.3%、燃烧稳定性最大增强23%,排温降至最低702℃,使航空煤油发动机动力特性以及燃烧稳定性得到有效提升.
