首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >A one-dimensional model for heat release rate and emission formation in diesel engines based on correlations for entrainment rate, lift-off length and ignition delay: Validation for transient conditions
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A one-dimensional model for heat release rate and emission formation in diesel engines based on correlations for entrainment rate, lift-off length and ignition delay: Validation for transient conditions

机译:基于夹带率,升程长度和点火延迟的相关性的柴油机放热率和排放形成的一维模型:瞬态条件验证

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摘要

A simplified one-dimensional model for combustion and emission formation in diesel engines has been developed in a project where the long-term objective is to predict the emissions during transient operation. The models are intended to be used as a tool for pre-development of after-treatment systems and for offline calibration of engine controls. These applications imply that the final model must be both computationally inexpensive and comprehensive. The model is based on a correlation for the air entrainment rate which is applied to a discretized injection event. On this, the combustion rate and the emission formation rate are imposed with simple models. In this publication, the model is validated for the targeted conditions and transient operation. The model is based on a previously presented model which was evaluated for steady state conditions. The model presented here has been modified to address the shortcomings that were identified in the previous evaluation. The model was able to predict the heat release rate and the emissions of nitrogen oxide (NO) and soot with reasonable accuracy and also the requirement regarding the computational time was met. The average time for simulation of one engine cycle was approximately 3 s on a standard laptop.
机译:在一个长期目标是预测瞬态运行期间的排放量的项目中,开发了简化的一维柴油机燃烧和排放物形成的一维模型。该模型旨在用作后处理系统的预开发和发动机控制的离线校准的工具。这些应用意味着最终模型必须在计算上既便宜又全面。该模型基于空气夹带率的相关性,该相关性适用于离散喷射事件。在此基础上,通过简单的模型确定燃烧速率和排放形成速率。在本出版物中,针对目标条件和瞬态运行对模型进行了验证。该模型基于先前介绍的模型,该模型针对稳态条件进行了评估。此处介绍的模型已经过修改,以解决先前评估中发现的缺点。该模型能够以合理的精度预测热量的释放速率以及氮氧化物和烟灰的排放,并且满足了计算时间的要求。在标准笔记本电脑上,模拟一个发动机循环的平均时间约为3 s。

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