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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Characterization of the flow field and stratification effects of fuel spray in a visualization engine using DPIV and entropy analysis
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Characterization of the flow field and stratification effects of fuel spray in a visualization engine using DPIV and entropy analysis

机译：使用DPIV和熵分析在可视化引擎中表征流场和燃油喷雾分层效应

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The objective of this study was to analyze the spray characteristics according to the injection duration under ambient pressure conditions and the injection timing in the visualization engine. In order to investigate spray behavior, the spray velocity is obtained through the PIV method a useful optical diagnostics technology and the vorticity calculated from the spray velocity component. These results elucidated the relationship between vorticity and entropy which plays an important role in the diffusion process for early injection and the stratification process for late injection cases. In addition, the homogeneous diffusion rate of spray was quantified using the entropy analysis based on Boltzmann's statistical thermodynamics. Using these methods, it was found that the homogeneous mixture distribution is more effective as a momentum dissipation of surrounding air than that of the spray concentration to increase the injection timing. It is found that the homogenous diffusion rate increased as the injection timing moved to the early intake stroke process, and BTDC 60 degrees was the most efficient injection timing for the stratified mixture formation during the compression stroke. (c) 2006 Elsevier Inc. All rights reserved.
机译：这项研究的目的是根据可视化引擎中在环境压力条件下的喷射持续时间和喷射正时来分析喷雾特性。为了研究喷雾行为，通过有用的光学诊断技术PIV方法获得喷雾速度，并从喷雾速度分量中计算出涡度。这些结果阐明了涡度和熵之间的关系，这在早期注射的扩散过程和晚期注射病例的分层过程中起着重要作用。另外，使用基于玻尔兹曼统计热力学的熵分析来量化喷雾的均匀扩散速率。使用这些方法，发现均匀的混合物分布作为周围空气的动量耗散比喷射浓度的动量耗散更有效，以增加喷射时间。已发现，随着喷射正时移至进气冲程早期过程，均匀扩散速率增加，而BTDC 60度是压缩冲程期间分层混合物形成的最有效喷射正时。 （c）2006 Elsevier Inc.保留所有权利。

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