喷油规律曲线对OPOC柴油机的性能影响分析
Influence of Injection Curve on OPOC Diesel Engine Performance

针对OPOC柴油机与传统柴油机结构、喷油方式的差异，研究分析了四种不同的喷油规律曲线对OPOC柴油机性能的影响情况，寻找燃烧、油耗和排放最优时的喷油规律。在AVL-FIRE中建立了燃烧室的动网格模型，模拟得到了四种喷油规律曲线下的发动机性能曲线。结果表明：三角形曲线的爆发压力峰值最大，升压最快；矩形曲线的初期混合迅速，预混燃烧放热量大；梯形曲线的后期混合最优，扩散燃烧阶段放热量大。
Aiming at the difference in structure and fuel injection between OPOC and traditional diesel engine, the influence of four different injection regular curves on the performance of OPOC diesel engine was studied to research the fuel injection rule when combustion, fuel consumption and emission are optimal. The dynamic grid model of the combustion chamber was established in AVL-FIRE, and the engine performance curves under four injection regular curves were simulated. The results show that the peak pressure of the triangular curve is the largest and the boost is the fastest. The initial mixing of the rectangular curve is rapid and the premixed combustion is large. The late mixing of the trapezoidal curve is optimal, and the heat release in the diffusion combustion stage is large.