Development of Strategies for Flow Management and/or Re-arrangement

制定流程管理和/或重新安排策略

• 批准号: RGPIN-2018-05456
• 负责人: floryan, jerzy
• 金额: $ 4.66万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=650871
• 关键词: Development; Strategies; Flow; Management; Re

Many industrial products contain flow systems whose performance affects the overall product capabilities, especially the energy cost of their operation. Reduction of the energy cost may come through the proper control/management/re-arrangement of flows within these systems. The present work is focused on the development of control techniques taking advantage of patterns of weak actuators which are individually irrelevant but can affect the flow in a decisive manner if arranged in spatial patterns. Since systems of actuators produce distributed forcing, identifying their most effective patterns and determining what can be achieved with these patterns are the goals of this work. Laminar, transitional as well as turbulent flows are targeted with priority given to passive techniques due to their simplicity and lack of failure-prone moving parts.*** The use of various physical phenomena capable of producing the desired distributed forcing will be considered. This includes the design of surface topography, determination of patterns of surface heating/cooling, investigation of patterns of surface transpiration as well as studies of patterns of surface vibrations. The forcing creates a direct flow response, i.e. spatial modulations, which may lead to the drag reduction by itself. The same forcing may create an indirect response where the flow modulations change the flow stability and the system bifurcates to a new state with a very minimal external actuation. It will be determined what can be achieved with both types of responses and under what conditions.*** The proposed work is divided into six themes. The first theme will determine the tolerance of the laminar-turbulent transition process to the presence of distributed surface. The second theme will identify surface topographies which can produce smaller friction drag in laminar as well as in turbulent flows. The third theme will identify surface topographies which both reduce frictional drag and control the laminar-turbulent transition. The fourth theme will use heating and corrugation patterns to control convective heat transfer with the more efficient heat exchangers being the goal. The fifth theme will look at the control of phase change processes using surface roughness and heating patterns with goals ranging from the control of airfoil icing to cooling of extremely hot surfaces. The sixth theme will determine how patterns of surface vibrations can be harnessed for drag reduction purposes and development of alternative propulsion schemes. Themes (a)-(c) will benefit the aerospace industry, resulting in the increase of its competitiveness. Themes (d)-(e) will benefit the energy and processing industries, potentially leading to the development of new products. Theme (e) will assist entities involved in the development of water crafts, removing some of the propulsion limiting factors.

许多工业产品都包含流体系统，其性能影响产品的整体性能，特别是其运行的能源成本。通过适当控制/管理/重新安排这些系统内的流动，可以降低能源成本。目前的工作重点是利用弱致动器模式的控制技术的发展，这些模式是单独无关的，但如果按空间模式排列，则可以以决定性的方式影响流量。由于执行器系统产生分布式强迫，因此确定其最有效的模式并确定这些模式可以实现的目标是本工作的目标。层流、过渡流和湍流是优先考虑被动技术的目标，因为它们简单且缺乏易发生故障的运动部件。***将考虑使用能够产生所需分布力的各种物理现象。这包括表面地形的设计，表面加热/冷却模式的确定，表面蒸腾模式的调查以及表面振动模式的研究。这种作用力产生了直接的流动响应，即空间调制，这可能会导致阻力的减少。同样的压力可能产生间接响应，其中流量调节改变了流量稳定性，系统在非常小的外部驱动下分叉到一个新的状态。将确定两种应对措施以及在什么条件下可以取得什么成果。拟议的工作分为六个主题。第一个主题将确定层流-湍流过渡过程对分布表面存在的容忍度。第二个主题将确定在层流和湍流中可以产生较小摩擦阻力的表面地形。第三个主题将确定既减少摩擦阻力又控制层流-湍流过渡的表面地形。第四个主题将使用加热和波纹模式来控制对流传热，以更有效的热交换器为目标。第五个主题将着眼于相变过程的控制使用表面粗糙度和加热模式的目标，从控制翼型结冰到极热表面的冷却。第六个主题将确定如何利用表面振动的模式来减少阻力和开发替代推进方案。主题(a)至(c)将使航空航天工业受益，从而提高其竞争力。主题(d)-(e)将有利于能源和加工工业，可能导致开发新产品。主题(e)将协助参与开发水艇的实体，消除一些推进限制因素。