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首页> 外文会议>International Conference on Engines and Vehicles >In-Cylinder Flow Pattern Evaluated with Combustion Image Velocimetry, CIV, and CFD Calculations during Combustion and Post-Oxidation in a HD Diesel Engine
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In-Cylinder Flow Pattern Evaluated with Combustion Image Velocimetry, CIV, and CFD Calculations during Combustion and Post-Oxidation in a HD Diesel Engine

机译：在高清柴油发动机中燃烧和后氧化过程中，用燃烧图像速度，文明和CFD计算评估的缸内流动模式

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In-cylinder flow pattern was evaluated during diesel combustion and post-oxidation in a heavy duty optical engine and compared with CFD calculations. In this work the recently developed optical method combustion image velocimetry (CIV) is evaluated. It was used for extracting the flow pattern during combustion and post-oxidation by tracing the glowing soot clouds in the cylinder. The results were compared with CFD sector simulation on the same heavy duty engine geometry. Load was 10 bar IMEP and injection pressure was varied in two steps together with two different swirl levels. The same variations were done in both the optical engine and in the CFD simulations. The main results in this work show that the CIV method and the CFD results catch the same flow pattern trends during combustion and post-oxidation. Evaluation of the CIV technique has been done on large scale swirl vortices and compared with the CFD results at different distances from the piston bowl surface. The flow field according to CIV is shown to resemble the flow quite near the optical piston bowl surface during the diffusion combustion period in the CFD results. During the after-oxidation period, the observed CIV data coincide with mean velocity data from CFD, calculated on the total depth from cylinder head to piston surface. Both methods indicate that the in-cylinder flow is strongly deviating from solid body rotation during the diffusion flame and after-oxidation period. This deviation is not so significant before injection. During the after-oxidation period, the deviation from solid body rotation increases with injection pressure.
机译：在柴油燃烧期间评价缸内流动图案，并与重型光学发动机的氧化后并与CFD计算进行比较。在这项工作中，评估最近开发的光学方法燃烧图像速度（CIV）。它用于通过在汽缸中追踪发光的烟灰云来提取燃烧和后氧化过程中的流动模式。将结果与同一重型发动机几何形状的CFD扇区模拟进行了比较。负载是10巴IMEP和注射压力在两个步骤中改变，与两个不同的涡流水平一起变化。在光学发动机和CFD仿真中，在光学发动机和CFD模拟中进行相同的变化。这项工作的主要结果表明，CIV方法和CFD结果在燃烧和后氧化过程中捕获相同的流动模式趋势。已经在大型涡流涡流上进行了对CIF技术的评估，并与来自活塞碗表面的不同距离的CFD结果相比。根据CIF的传感器在CFD结果中的扩散燃烧时段期间，根据CIV的流场类似于光学活塞碗表面附近的流动。在氧化期间，观察到的文明数据与CFD的平均速度数据一致，从气缸盖到活塞表面的总深度计算。两种方法表明，在扩散火焰和氧化时段期间，缸内流动强烈地偏离固体旋转。在注射之前，这种偏差并不重要。在后氧化期间，与固体旋转的偏差随注射压力而增加。

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