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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=759851
• 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.

许多工业产品包含流量系统，其性能影响整体产品能力，特别是其操作的能量成本。能源成本的降低可以通过这些系统内的流的适当控制/管理/重新布置来实现。目前的工作集中在控制技术的发展，利用模式的弱致动器是单独无关的，但可以影响流的决定性的方式，如果安排在空间模式。由于系统的执行器产生分布式强迫，识别其最有效的模式，并确定可以实现这些模式是这项工作的目标。层流、过渡流和湍流是优先考虑被动技术的目标，因为它们简单且没有容易发生故障的移动部件。 将考虑使用各种物理现象能够产生所需的分布强迫。这包括表面形貌的设计、表面加热/冷却模式的确定、表面蒸发模式的调查以及表面振动模式的研究。强迫产生直接的流动响应，即空间调制，其本身可导致阻力减小。相同的强制可以产生间接响应，其中流量调制改变流量稳定性，并且系统分叉到具有非常小的外部致动的新状态。将确定在何种条件下采用这两种对策可以取得何种成果。 拟议的工作分为六个主题。第一个主题将确定层流-湍流转捩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能产生较小摩擦阻力的表面形貌。第三个主题将确定既能减少摩擦阻力又能控制层流-紊流转捩的表面形貌。第四个主题将使用加热和冷却模式来控制对流热传递，目标是更有效的热交换器。第五个主题将着眼于利用表面粗糙度和加热模式控制相变过程，其目标范围从翼型结冰的控制到极热表面的冷却。第六个主题将确定如何利用表面振动模式来减少阻力和开发替代推进方案。主题（a）-（c）将有利于航空航天工业，从而提高其竞争力。主题（d）-（e）将有利于能源和加工工业，有可能导致新产品的开发。主题（e）将协助参与水上交通工具开发的实体，消除一些限制推进力的因素。