US-Germany Cooperative Research: Turbulence-Ignition Coupling

该奖项支持Volker Schmidt和密歇根大学的学生与德国斯图加特大学技术燃烧研究所的Ulrich Maas合作。合作的重点将是对点火过程作出可靠的数字描述，其中包括涵盖许多数量级和许多化学物种及其相关反应速率的时间尺度。在许多技术设备中，启动燃烧是解决与性能和安全相关的问题的关键步骤。一个重要的例子是往复式内燃机中使用的火花点火燃烧。在这里，点火和随后的火焰发展和传播是由湍流、温度和压力等物理参数与化学参数(如混合物的组成)高度复杂的相互作用控制的。密歇根大学在激光成像技术方面的专业知识，以及斯图加特大学在点火过程多维建模(包括详细的化学动力学)方面的专业知识，结合国际学生和科学家交流的框架，将提高我们对湍流和点火化学复杂相互作用的理解。在密歇根大学进行的光学直喷式发动机的速度和当量比测量将有助于改进斯图加特大学的模拟工具。此外，让这两个合作机构的学生参与，将增强这些学生的教育体验，使他们超越目前各自研究项目的重点，并使他们能够在外国学习；在当今的全球研究和商业环境中，这几乎是必须的。学生将学习技能，然后他们可以将这些技能应用于他们在本国机构的研究项目中。预计这两个小组的相互培训安排将产生实质性的协同作用。联合起来将加强单独研究工作的成果，并有望使我们对湍流-点火耦合的理解和模拟能力取得重大进展。

0337701SickThis award supports Volker Schmidt and students from the University of Michigan in a collaboration with Ulrich Maas of the Institute for Technical Combustion at the University of Stuttgart, Germany. The focus of the collaboration will be to produce a reliable numerical description of ignition processes that accommodates timescales covering many orders of magnitude and many chemical species and their related reaction rates. Initiating combustion is a critical step for both performance and safety related issues in many technical devices. An important example is the spark-initiated combustion used in reciprocating internal combustion engines. There, ignition and subsequent flame development and propagation are controlled by the highly complex interaction of physical parameters like turbulence, temperature, and pressure with chemical parameters, such as the composition of the mixtures. The expertise in laser-based imaging techniques at the University of Michigan and the expertise in multi-dimensional modeling of ignition processes that includes detailed chemical kinetics at the University of Stuttgart, when combined in the framework of an international exchange of students and scientists, will improve our understanding of the complex interaction of turbulence and ignition chemistry. Velocity and equivalence ratio measurements in an optical direct injection engine performed at the University of Michigan will assist improvements to simulation tools at the University of Stuttgart. In addition, involving students from both partner institutions will enhance the educational experience for those students beyond their current focus in their respective research projects and will allow them to study in a foreign country; this is almost a must in today's global research and business environment. Students will learn skills that they then can implement in their research projects at their home institutions. Substantial synergy is expected from this mutual training arrangement for both groups. Joining forces will enhance the outcome of the separate research efforts and is expected to result in significant progress of our understanding of turbulence-ignition coupling and our ability to simulate it.