Fundamentals and applications of arrangements of pulsed fluid jets

脉冲流体射流布置的基础和应用

• 批准号: RGPIN-2022-03349
• 负责人: DiLabbio, Giuseppe
• 金额: $ 1.82万
• 依托单位: École de technologie supérieure
• 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=754430
• 关键词: Fundamentals; applications; arrangements; pulsed; fluid

Individual pulsed fluid jets are often associated with the locomotion of aquatic animals such as squid, octopuses, nautiluses, jellyfish and even scallops. In industry, they find applications in water jet machining, dentistry and the cooling of electronic components. It therefore comes as no surprise that significant research has been devoted to the fluid dynamics of the individual pulsed jet and the development of its applications. Very little, however, is known about the fluid dynamics of arrangements of two or more pulsed jets. Arrangements of pulsed jets are also observed in aquatic animals (e.g., salps, siphonophores) and have many promising applications that can have a significant impact on health and innovation in Canada. For example, our bladders fill intermittently from two pulsed ureteric jets. The behaviour of these jets is known to change in the presence of adverse urinary conditions such as kidney stones, which affects 1 in 10 Canadians. A better understanding of the fluid dynamics of pairs of pulsed jets can therefore lead to a link between bladder ultrasound flow patterns and the health of the urinary system. In engineering, pulsed jets can be used as an energy-efficient means of locomotion for autonomous aquatic robots and vehicles. This research program will therefore pioneer knowledge of the fluid dynamics of pulsed jet arrangements and develop new advanced applications and technologies to Canada's benefit. This program is arranged into three principal directions or axes. In Research Axis 1, we will conduct parametric, three-dimensional, time-resolved numerical and experimental studies of two single-pulsed fluid jets in free and confined environments. This research will significantly advance knowledge of the fluid dynamics of pairs of pulsed jets, which will provide much needed insight for certain physiological and pathological urinary and cardiac flows. The knowledge generated from this axis is also expected to bolster innovation in such applications as aquatic vehicle locomotion, mitigation of flow separation and industrial/batch mixing of shear-sensitive substances. In the following research axes, we will research and develop the use of pulsed jets for the latter two applications. In Research Axis 2, we will investigate the ability of an array of pulsed jets to mitigate flow separation on a flat plate (experimentally) and over airfoils (numerically). This research is expected to lead to a novel strategy and technology to mitigate flow separation over aircraft wings for a dynamic range of angles of attack, thereby improving fuel economy. In Research Axis 3, we will investigate and model optimal, low shear mixing protocols in a confined circular environment through numerical simulations and develop a pulsed-jet-controlled batch mixing device. The resulting technology is expected to markedly improve mixing times at a reduced energy expense for the mixing of shear-sensitive substances (e.g., certain food products).

单个脉冲流体射流通常与诸如鱿鱼、章鱼、鹦鹉螺、水母甚至扇贝的水生动物的运动相关联。在工业中，它们被应用于水射流加工、牙科和电子元件的冷却。因此，毫不奇怪，重要的研究一直致力于单个脉冲射流的流体动力学及其应用的发展。然而，很少有人知道的两个或多个脉冲射流的安排的流体动力学。脉冲射流的排列也在水生动物中观察到（例如，Salps，管水母），并有许多有前途的应用，可以对加拿大的健康和创新产生重大影响。例如，我们的膀胱间歇性地从两个脉冲输尿管射流中充盈。已知这些射流的行为会在存在不利的泌尿系统疾病（如肾结石）的情况下发生变化，这影响了十分之一的加拿大人。因此，更好地理解成对脉冲射流的流体动力学可以导致膀胱超声流动模式与泌尿系统健康之间的联系。在工程中，脉冲射流可以用作自主水上机器人和车辆的节能运动手段。因此，这项研究计划将开拓脉冲射流安排的流体动力学知识，并开发新的先进应用和技术，以加拿大的利益。这个程序被安排成三个主要方向或轴。在研究轴1中，我们将对自由和受限环境中的两种单脉冲流体射流进行参数化、三维、时间分辨的数值和实验研究。这项研究将显着推进对脉冲射流的流体动力学的知识，这将提供某些生理和病理的尿液和心脏流动急需的洞察力。从这一轴线产生的知识也有望支持创新，如水上车辆运动，减轻流动分离和剪切敏感物质的工业/批量混合等应用。在接下来的研究中，我们将研究和开发脉冲射流在后两种应用中的应用。在研究轴2中，我们将研究脉冲射流阵列减轻平板（实验）和翼型（数值）上流动分离的能力。这项研究有望导致一种新的策略和技术，以减轻飞机机翼上的流动分离的动态范围的迎角，从而提高燃油经济性。在研究轴3中，我们将通过数值模拟研究和模拟封闭循环环境中的最佳低剪切混合方案，并开发一种脉冲射流控制的批量混合装置。预期所得到的技术将以减少的能量消耗显著改善混合时间，用于混合剪切敏感物质（例如，某些食品）。