NSF/DOE Advanced Combustion Engines: Development of a Dynamic Wall Layer Model for LES of Internal Combustion Engines

CBET 1258609 PI（机构）：Ihme（斯坦福大学U），Sicke/Reuss（密歇根大学），法哈尔多（W.密歇根州U.）内燃机中近壁流体运动和传热的基于物理的预测模型的开发和实施提供了一种使能技术。该模型来自基础、高保真度模拟和最先进的实验，为稀燃和低温燃烧（LTC）发动机的实施带来了新的能力。12%的燃油经济性增益比节流火花点火汽油发动机被证明，高达20%的预期。使用柴油类燃料，LTC发动机的收益预计将超过10%。对于内燃机，近壁流动还没有从根本上了解，但对传热有重要影响，并影响壁面附近的化学反应性。这些过程反过来又影响LTC发动机的稳定性，从而影响发动机的运行效率和污染物的形成。本文将通过详细的数值模拟和高速激光成像实验，对缸内近壁区结构进行深入的了解，并建立一个适用于大涡模拟的壁面函数模型。将在光学引擎中进行验证研究，以证明该模型在各种操作模式和条件下的适用性和性能。该研究与工业和国家实验室的多项合作活动相结合，以加快基础和应用工作的进展。研究工作被纳入一系列创新学习和推广活动，有助于招募和教育科学和工程工作人员。本科生、研究生研究助理和博士后研究人员参与了该项目的各个层面。一些教育和推广活动被纳入这个项目，包括通过“工程管道”计划和机会参加内部研究交流计划的高中学生的重新cruising。这些独特的学习和推广元素符合密歇根大学工程学院的使命，即至少有一半的本科生获得国际经验，作为他们大学教育的一部分。研究数据通过发动机燃烧网络向公众传播。通过NSF的立法和公共事务办公室以及“人人科学”和“LiveScience.com”等场所，为外行观众制作和传播文章、视频和其他媒体。"

CBET 1258609PI (Institution): Ihme (Stanford U), Sicke/Reuss (U Michigan), Fajardo (W. Mich. U.) The development and implementation of a physics-based predictive model for near-wall fluid motion and heat transfer in internal combustion engines provides an enabling technology. The model, derived from fundamental, high-fidelity simulations and state-of-the art experiments, leads to new capabilities for the implementation of lean-burn and low-temperature combustion (LTC) engines. 12% fuel economy gains over throttled spark-ignition gasoline engines were demonstrated and up to 20% are expected. Operated on Diesel-like fuels, gains for LTC engines are expected to be in excess of 10%. The near-wall flow is not fundamentally understood for in-ternal combustion engines, but has leading impact on heat transfer and affects chemical reactivity near walls. These processes in turn affect the stability and thus the efficiency of LTC engine op-eration and pollutant formation. Detailed numerical simulation and high-speed laser imaging ex-periments will be conducted with the objective of obtaining fundamental understanding about in-cylinder near-wall structure and developing a wall-function model for large-eddy simulations. Validation studies in optical engines will be performed to demonstrate the applicability and per-formance of the model for a wide range of operating modes and conditions. Integrated into this research are several collaborative activities with industry and national laboratories to accelerate progress at both the fundamental as well as the application end of the work.The research work is integrated into a range of innovative learning and outreach activities that contribute to recruiting and educating the scientific and engineering work force. Undergraduate, graduate research assistants, and postdoctoral researchers are involved at all levels with the pro-ject. Several educational and outreach activities are integrated into this project, including the re-cruitment of high-school students through the "Engineering Pipeline" program and opportunities to participate in internal research exchange programs. These unique learning and outreach ele-ments are in line with the University of Michigan's College of Engineering's mission to have at least half of the undergraduate students gain an international experience as part of their College education. Research data are disseminated to the public via the Engine Combustion Network. Production and dissemination of articles, videos, and other media for lay audiences are facilitated through NSF's Office of Legislative and Public Affairs and venues such as "Science for Every-one" and "LiveScience.com."