进气道喷水对氩气循环氢燃料发动机热效率与动力边界拓展的影响研究

Research on Impact of Port Water Injection on Thermal Efficiency and Power Boundary Expansion of Argon Power Cycle Hydrogen Engine

针对氩气循环氢燃料发动机工质比热容比高,会引起异常燃烧现象,从而限制其热效率提升效果的问题,通过仿真和试验分析了进气道喷水对氩气循环氢燃料发动机的热力学参数和爆震的影响,并通过结合缸内直喷和进气增压,联合优化点火策略、喷射策略以及喷水策略,最终获得了最高62.41%的指示热效率(总指示热效率58.62%)。

The argon power cycle hydrogen engine encounters limitations due to the occurrence of abnormal combustion phenomena resulting from the high specific heat ratio of the working mass.Consequently,the thermal efficiency enhancement potential of this concept remains underutilized.A combination of simulation and experimental analysis was employed to investigate the impact of port water injection on the thermodynamic parameters of the argon power cycle hydrogen engine as well as the influence of knock suppression.By employing a comprehensive approach that incorporates hydrogen direct injection,intake boost and simultaneous optimization of ignition,hydrogen injection and water injection strategies,of a notable improvement in the maximum indicated thermal efficiency,reaching 62.41%(gross indicated thermal efficiency 58.62%),was ultimately achieved.