Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV
Pre- and post-injection flow characterization in a heavy-duty diesel engine using high-speed PIV
复制标题
使用高速 PIV 表征重型柴油发动机的喷射前和喷射后流动特性
DOI：
10.1007/s00348-012-1323-3
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
L. D. Goey
中科院分区：
文献类型：
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作者：
R. Zegers;C. Luijten;N. Dam;L. D. Goey
采用空心微球高速粒子图像测速技术（HS-PIV）对某重型柴油机喷油过程及喷油后的流场进行了研究。喷射定时在代表预混充气压缩点火（PCCI）方案中使用的喷射定时范围内变化，并且已应用多次喷射来研究它们对燃烧室内流动的影响。通过注入纯氮气，避免了燃烧，并且可以在注入后很长时间内研究流动。结果表明，在喷射开始时，由于喷雾核心处的空气卷吸，空气运动发生突变。此外，正如预期的那样，喷雾喷射导致流动模式的周期到周期波动的显著增加，对于较长的喷射持续时间更是如此。
High-speed particle image velocimetry (HS-PIV) using hollow microspheres has been applied to characterize the flow in a heavy-duty diesel engine during and after fuel injection. The injection timings were varied in the range representing those used in premixed charge compression ignition (PCCI) regimes, and multiple injections have been applied to investigate their influence on the flow inside the combustion chamber. By injecting into pure nitrogen, combustion is avoided and the flow can be studied long after injection. The results show a sudden change of air motion at the start of injection as a result of the air entrainment at the core of the spray. Furthermore, as expected, spray injection causes a considerable increase in the cycle-to-cycle fluctuations of the flow pattern, the more so for longer injection durations.