Emulsified biofuel (EB) has a relatively higher viscosity compared to conventional diesel; which affects the spray injection and restricts the maximum evaporation. The modification is necessary to standard engines in order to realize its application. This paper presents the effects of three dissimilar designs of piston-bowl geometry in the compression ignition (CI) engine to in-cylinder airflow characteristics improvement of the EB during injection. The three piston bowl geometry designs; open cylinder bowl (OCB), shallow depth re-entrance combustion chamber (SCC) and omega combustion chamber (OCC). ANSYS FLUENT 15 is utilized to run a three dimensional (3D) cold flow internal combustion (IC) engine simulation. The main parameters of this investigation; swirl, tumble and cross tumble ratios, as well as turbulence kinetic energy (TKE), with respect to crank angle. It shows that the SCC piston bowl design is the best due to significant effect on swirl, tumble, cross tumble ratios and TKE in the injection fuel region. It breaks up the length penetration of injection to mix with the surrounding air and capable to organize the distribution of the heavier molecules of the EB during the compression stage.

与常规柴油相比，乳化生物燃料（EB）具有相对较高的粘度。这会影响喷雾喷射并限制最大蒸发量。为了实现其应用，必须对标准引擎进行修改。本文介绍了压缩点火（CI）发动机中三种不同的活塞-碗形几何设计对改进喷射期间EB的缸内气流特性的影响。三个活塞碗的几何设计；敞开式汽缸碗（OCB），浅层重入燃烧室（SCC）和欧米茄燃烧室（OCC）。ANSYS FLUENT 15用于运行三维（3D）冷流内燃（IC）发动机仿真。本次调查的主要参数；涡流，翻转和交叉翻转比以及湍流动能（TKE），关于曲柄角。它表明，SCC活塞碗设计是最佳的，因为它对喷射燃料区域中的涡流，翻转，横向翻转比和TKE产生了显着影响。它打破了注射的长度穿透力，可与周围的空气混合，并能够在压缩阶段组织较重的EB分子分布。