Vorticity-Based Characterization of a High Reynolds Number Single-Stream Shear Layer

项目编号：CTS-0352710 PRINCIPAL调查员：John F.FOSSINSTUTION：密歇根州立大学对高雷诺数单流剪切层的表征这笔赠款将通过提供实验数据和从这些数据中得出的见解，支持有助于理解湍流物理的研究，这些数据将表征单流剪切层的间歇区(高速和低速侧)(自保留区)。剪切层是存在于许多工程应用中的基本构件正则湍流之一。此外，这些数据本身也提供了对湍流物理的洞察，预计将对开发大涡模拟(LES)计算工具有价值。具体地说，将提供的详细随机信息将为此类计算提供有价值的参考条件。作为一个附加功能，四传感器涡度探测器阵列将直接提供适合大涡模拟计算的空间滤波数据。此外，基于涡度的间歇命名将为湍流运动的这一基本量度提供定义。这些精确的和时间分辨的数据的可用性将支持大涡模拟计算，这反过来又为更成功地计算在实际工程问题中普遍存在的湍流提供了进展。衍生的好处包括：改进的燃烧效率、更好的混合过程和对声发射的洞察力。更广泛的影响包括技术因素，例如工程计算，以及教育因素。一个直接的好处是支持一个实验室，它大力鼓励不同学生的机会，并为大学年龄段的参与者提供研究参与。高中生的参与(密歇根州立大学-高中荣誉科学计划)是另一个直接的好处。为学生提供研究经验的长期承诺将因与这项资助相关的机会而得到加强。

ABSTRACTPROPOSAL NO.: CTS-0352710PRINCIPAL INVESTIGATORS: JOHN F. FOSSINSTITUTION: MICHIGAN STATE UNIVERSITYVORTICITY-BASED CHARACTERIZATION OF A HIGH REYNOLDS NUMBER SINGLE-STREAM SHEAR LAYERThis grant will support research that will contribute to understanding turbulent flow physics by providing experimental data, and the insights derived from these data, that will characterize the intermittent regions (high and low speed sides) of a single-stream shear layer (self-preserving region). The shear layer is one of the basic building block canonical turbulent flows that is present in many engineering applications. These data, in addition too providing insight into the physics of turbulence in their own right, are expected to be of value in the development of Large Eddy Simulation (LES) computational tools. Specifically, the detailed stochastic information to be provided will provide a valuable reference condition for such computations. As an added feature, the array of four-sensor vorticity probes will directly provide the spatially-filtered data appropriate for an LES computation. In addition, the vorticity-based intermittency designations will provide a definition for this fundamental measure of the turbulent motions. The availability of these accurate and time-resolved data will support LES computations, which in turn, promise advances for more successful computations of the turbulent flows that are ubiquitous in practical engineering problems. Derivative benefits include: improved combustion efficiencies, better mixing processes and insight into acoustic emissions. Broader impacts include technological elements, e.g. engineering computations, as well as educational ones. A direct benefit is to support a laboratory that strongly encourages opportunities for diverse students, and research involvements for college age participants. The involvement of high school students (MSU-High School Honors Science Program) is a further direct benefit. The PI's long-term commitment, to providing student research experience will be strengthened by the opportunities associated with this grant.