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首页> 外文期刊>Energy Conversion & Management >Characteristics of in-cylinder flow and mixture formation in a high-pressure spray-guided gasoline direct-injection optically accessible engine using PIV measurements and CFD
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Characteristics of in-cylinder flow and mixture formation in a high-pressure spray-guided gasoline direct-injection optically accessible engine using PIV measurements and CFD

机译：使用PIV测量和CFD在高压喷射引导汽油直喷光学访问发动机中缸内流动和混合物形成的特性

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摘要

In this study, a spray-guided gasoline direct-injection 2-cylinder optically accessible engine was used to analyze the characteristics of the in-cylinder flow and mixture formation using PIV measurements and computational fluid dynamics (CFD; CONVERGE v2.4). The mean velocity, tumble ratio, turbulent kinetic energy, and tumble center were calculated to quantify the characteristics of the in-cylinder flow. Moreover, flow rotation intensity was defined to evaluate the in-cylinder flow depending on the crank angle. In the early stage of the intake stroke, the intake air flowed into the cylinder with high momentum and velocity. Subsequently, tumble flow was generated in the middle stage of the intake stroke, and weak in-cylinder flow occurred during the compression stroke owing to the dissipation of momentum. The fuel injection caused intensification of the in-cylinder flow, increasing the in-cylinder flow velocity, tumble ratio, and turbulent kinetic energy. Furthermore, mixture formation was affected by the end of the injection timing and its characteristics were classified into homogeneous, stratified, and mal-distribution mixtures, depending on the region to which the end of injection timing belonged.
机译：在这项研究中，使用PIV测量和计算流体动力学（CFD; CONGEGE V2.4）来利用喷射引导汽油直喷式2缸光学接近的发动机来分析缸内流动缸内流动和混合物形成的特性。计算平均速度，翻滚比，湍流的动能和滚筒以量化缸内流动的特性。此外，定义了流动旋转强度以根据曲柄角度评估缸内流动。在进气冲程的早期阶段，进气流流入气缸，具有高动量和速度。随后，在进气冲程的中间阶段产生滚动流动，由于动量耗散，在压缩冲程期间发生弱缸流。燃料喷射引起缸内流量的强化，增加了缸内流速，翻滚率和湍流动能。此外，将混合物形成受注射正时结束的影响，并且其特征分为均匀，分层和混合物，这取决于注射时间结束所属的区域。

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