Studies of the Vortical Structure of the Turbulent Boundary Layer and Its Control

湍流边界层涡旋结构及其控制研究

• 批准号: 8911892
• 负责人: James Wallace
• 金额: $ 41.54万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-09-15 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911892&HistoricalAwards=false
• 关键词: Studies; Vortical; Structure; Turbulent; Boundary

Turbulent boundary layer structure near a bounding wall is to be studied experimentally and through numerical simulation. The experimental tools will be a miniaturized nine-sensor hot-wire probe which can measure both velocity and vorticity, as well as flow visualization. The focus is on elucidating the complex three- dimensional vortex structures known to exist in turbulent flow past a surface. Both smooth surfaces, as well as those modified by riblets, will be studied. Riblets are known to produce drag-reducing effects, but the mechanism responsible for this is as yet not understood. This study will advance the understanding, prediction, and control of this effect.

边界墙附近的湍流边界层结构将通过实验和数值模拟进行研究。 实验工具将是一个小型化的九传感器热线探头，可以测量速度和涡度，以及流量可视化。 重点是阐明已知存在于经过表面的湍流中的复杂三维涡流结构。 光滑表面以及由肋条修饰的表面都将被研究。 众所周知，肋骨可以产生减阻效果，但其机制尚不清楚。 这项研究将促进对这种效应的理解、预测和控制。