氢气-空气预混氛围下航空煤油喷射位置对X型转子发动机缸内流动及燃烧特性的影响

doi:10.3901/JME.260542

摘要/Abstract

摘要： 为探究氢气-空气预混氛围下X型转子发动机球型燃烧室内湍流场与喷射位置的耦合作用对混合气形成及燃烧过程的影响，依托CONVERGE软件构建三维仿真模型，研究了顶部、底部、左侧、右侧四种缸内直喷位置下的燃油喷射特性与燃烧过程。研究表明，左侧和顶部喷射时，可在进气冲程诱导出更强湍流，其中左侧喷射因喷雾方向与进气流动协同，在压缩冲程末期实现了混合气的均匀分布；右侧喷射时，油束方向与单向流反向导致湍流强度最弱，局部区域出现燃油残留。左侧喷射时滞燃期最短，右侧喷射时滞燃期最长，但峰值放热率最高、燃烧过程最快；相比其他三种喷射位置，喷射位置在右侧时发动机的循环指示功最高，可达73.4 J，但有爆震风险。通过设置四种典型喷射位置，揭示喷射位置与缸内流场演化、燃烧动力学之间的耦合作用规律，为直喷X型转子发动机燃烧系统的精细化设计提供理论依据与数据支撑。

关键词: X型转子发动机, 喷射位置, 缸内流动, 燃烧特性

Abstract: To investigate the coupling effect of the turbulent flow field and injection position on mixture formation and combustion process in the spherical combustion chamber of an X-type rotary engine under a hydrogen-air premixed atmosphere, a three-dimensional simulation model is constructed based on CONVERGE software. The fuel injection characteristics and combustion process are investigated at four in-cylinder direct injection positions: top, bottom, left and right. It is demonstrated that stronger turbulence is induced during the intake stroke with left and top injection. Among them, uniform mixture distribution is achieved at the end of the compression stroke with left injection, as the spray direction is coordinated with the intake flow. For right injection, the reverse fuel spray leads to the weakest turbulence intensity, and fuel retention is observed in local regions. The shortest ignition delay period is obtained with left injection, while the longest ignition delay, the highest peak heat release rate and the fastest combustion process are presented with right injection. Compared with the other three injection positions, the highest indicated work per cycle of 73.4 J is achieved with right injection, although knock risk is introduced. Through the adoption of four typical injection positions, the coupling law between injection position, in-cylinder flow field evolution and combustion dynamics is revealed, which provides a theoretical basis and data support for the refined design of the combustion system of direct-injection X-type rotary engines.

Key words: X-type rotary engine, fuel injection position, flow inside the cylinder, combustion characteristic

中图分类号:

TG156

徐扬帆, 尹晓军, 王锡斌, 段浩, 胡二江, 曾科. 氢气-空气预混氛围下航空煤油喷射位置对X型转子发动机缸内流动及燃烧特性的影响[J]. 机械工程学报, 2026, 62(14): 258-268.

XU Yangfan, YIN Xiaojun, WANG Xibin, DUAN Hao, HU Erjiang, ZENG Ke. The Influence of Different Injection Positions on the Flow and Combustion Process Inside the Cylinder of X-type Rotary Engine[J]. Journal of Mechanical Engineering, 2026, 62(14): 258-268.

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http://www.cjmenet.com.cn/CN/Y2026/V62/I14/258

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