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A theoretical and experimental study of emissions modeling for diesel engines with comparison to in-cylinder imaging.

机译：与缸内成像相比，柴油机排放模型的理论和实验研究。

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摘要

A theoretical and experimental study has been performed to develop a multidimensional model for predicting soot and NOx emissions from a modern heavy duty diesel engine. A number of soot formation and oxidation models have been explored including single species and multi-species formation models as well as kinetic and mixing controlled soot oxidation models.; To validate the soot model, in-cylinder imaging of diesel combustion in a single cylinder research engine was performed. Two-Color imaging optics and processing technology were developed to convert raw intensity images into soot temperature and soot concentration (KL factor) fields. Additionally, crank-angle-resolved average soot temperature and concentration were compared against predictions.; A second experimental program was performed to validate the NOx model. A heavy duty diesel engine was converted to a naturally aspirated, spark-ignited gas engine fueled with a stoichiometric charge of propane and air. NOx measurements were performed over a wide range of speed, ignition timing and EGR fractions.; With the currently modified model applied to a modern heavy duty DI diesel engine, soot emission trends are well predicted, including prediction of the "soot catastrophe." Modeling NOx with the Extended Zel'dovich mechanism was found to predict NOx trends in both a DI diesel engine and a spark-ignited gas engine.; For soot modeling, a high soot formation rate combined with the coupling of the soot mass and energy was found necessary to predict very high soot loads. Additionally, soot mass is satisfactorily predicted with a single species soot model combined with a mixing controlled oxidation model that has been modified for temperature sensitivity. Soot flame radiation was added as an energy source to the fuel droplets, which increased the soot model sensitivity and enhanced its ability to predict high soot levels in cases where they were observed experimentally.; The currently modified multidimensional model has been validated against experiments and is demonstrated to be capable of evaluating alternative fuel injection strategies, including double and triple injections, and operating conditions for the purpose of designing a low emissions diesel engine.
机译：已经进行了理论和实验研究，以开发多维模型来预测现代重型柴油机的烟尘和NOx排放。已经探索了许多烟灰形成和氧化模型，包括单物种和多物种的形成模型以及动力学和混合控制的烟尘氧化模型。为了验证烟灰模型，在单缸研究型发动机中进行了柴油燃烧的缸内成像。开发了双色成像光学器件和处理技术，可将原始强度图像转换为烟尘温度和烟尘浓度（KL因子）场。另外，将曲柄角分辨的平均烟so温度和浓度与预测值进行了比较。执行第二个实验程序以验证NOx模型。重型柴油发动机被转换为自然吸气，火花点火式燃气发动机，以丙烷和空气的化学计量加入。在广泛的速度，点火正时和EGR分数范围内进行了NOx测量。通过将当前修改的模型应用于现代重型DI柴油机，可以很好地预测烟尘排放趋势，包括“烟尘灾难”的预测。发现用扩展的Zel'dovich机理模拟NOx可以预测DI柴油机和火花点火式燃气发动机的NOx趋势。对于烟灰建模，发现高烟灰形成速率与烟灰质量和能量的耦合相结合对于预测非常高的烟灰负荷是必要的。此外，用单一种类的烟灰模型与已针对温度敏感性进行了修改的混合控制氧化模型相结合，可以令人满意地预测烟灰质量。烟尘火焰辐射被添加为燃料液滴的能源，这增加了烟尘模型的敏感性，并增强了在实验观察到的情况下预测高烟尘水平的能力。当前修改的多维模型已经通过实验验证，并被证明能够评估替代燃料喷射策略，包括两次和三次喷射以及运行条件，以设计低排放柴油机。

著录项

  • 作者

    Hampson, Gregory James.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Mechanical.; Engineering Automotive.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 333 p.
  • 总页数 333
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;自动化技术及设备;
  • 关键词

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