Abstract Soot deposition on combustion chamber walls of a diesel engine is one of the key concerns among diesel engine manufacturers as it affects the durability and wear of the power cylinder components. The deposition of soot on the liner also gets scraped to the crank case and leads to soot in the lubrication oil. In this work, a modeling framework is presented to estimate the deposition of soot on the liner walls. Three-dimensional computational fluid dynamic combustion simulations are performed at two operating loads for a direct injection heavy duty diesel engine. A sectional soot model coupled with gas phase chemical kinetics is used to model soot in the combustion chamber. The combustion and soot models are validated by comparing in-cylinder pressure, heat release rate and soot mass from simulations with the experimental data. A thermophoretic soot deposition model is presented which transports soot from combustion to the liner walls. Detailed in-cylinder soot mass fraction contours are used to explain the deposition phenomenon. The deposition of soot on the liner is qualitatively compared to measured soot in the lubrication oil and a good agreement is observed. The proposed modeling framework shall be helpful for optimizing combustion systems to reduce degradation of lubrication oil.

中文翻译：

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柴油机气缸套热泳沉积的数值模拟采用截面煤烟模型

摘要 柴油机燃烧室壁上的碳烟沉积是柴油机制造商关注的关键问题之一，因为它会影响动力缸部件的耐用性和磨损。衬套上沉积的烟灰也会被刮到曲轴箱上并导致润滑油中出现烟灰。在这项工作中，提出了一个建模框架来估计烟灰在衬里壁上的沉积。在直喷重型柴油发动机的两个工作负载下执行三维计算流体动力学燃烧模拟。结合气相化学动力学的截面烟灰模型用于模拟燃烧室中的烟灰。通过将模拟中的缸内压力、放热率和烟尘质量与实验数据进行比较，对燃烧和烟尘模型进行了验证。提出了一种热泳烟灰沉积模型，该模型将烟灰从燃烧传输到衬里壁。详细的缸内碳烟质量分数轮廓用于解释沉积现象。衬套上的烟灰沉积与润滑油中测得的烟灰进行定性比较，并观察到良好的一致性。建议的建模框架将有助于优化燃烧系统以减少润滑油的退化。