CAREER: Control of Vortex Breakdown in High-Reynolds Number Rotor Flows with Secondary Vortex Structures

职业：利用二次涡结构控制高雷诺数转子流中的涡破裂

• 批准号: 1917163
• 负责人: Victor Maldonado
• 金额: $ 41.9万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-01-01 至 2024-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1917163&HistoricalAwards=false
• 关键词: CAREER; Control; Vortex; Breakdown; Reynolds

This project seeks to study and reduce the negative impact of blade tip vortices on rotor-based systems such as wind turbines, gas turbines for energy production or aircraft propulsion, and rotorcraft. Currently these systems suffer from underperformance due to an inability to control or diffuse the high-energy content of the blade tip vortex. A major aspect of the project is the large-scale experiments in a unique high-wind hurricane simulator facility at Florida International University that enables flow-similitude and realistic application of the results to full-scale rotor-based systems. Such educational training is vital to increase the pool of experimental thermal-fluids engineers that can continue to improve the efficiency of energy systems for the benefit of society. The proposed large-scale experiments will test new theories and create new knowledge of high- Reynolds number blade tip vortex breakdown using secondary vortex structures created by synthetic jets and chord-wise wall oscillations. The intellectual significance is a semi-empirical model that describes the characteristics of secondary vortices (e.g. length/ time scales, vorticity) necessary for vortex breakdown to occur, as well as its impact on turbulent kinetic energy, which is believed to induce blade structural vibration. The flow will be measured using stereoscopic particle image velocimetry techniques and analyzed using proper orthogonal decomposition (POD) as well as three-dimensional flow reconstruction from an array of two-dimensional measurement planes. These methods are unique for large-domain high Reynolds number flows. They will be used to shed light on blade tip vortex energy content/ POD modes, as well as to advance the field of experimental vortex dynamics particularly at high Reynolds numbers.

该项目旨在研究和减少叶尖涡流对基于转子的系统的负面影响，例如风力涡轮机，用于能源生产或飞机推进的燃气涡轮机和旋翼飞机。目前，这些系统由于不能控制或扩散叶尖涡流的高能量含量而遭受性能不佳。该项目的一个主要方面是在佛罗里达国际大学的一个独特的强风飓风模拟器设施中进行大规模实验，该设施能够进行流动模拟，并将结果实际应用于全尺寸转子系统。这种教育培训对于增加实验性热流体工程师的人才库至关重要，这些工程师可以继续提高能源系统的效率，造福社会。拟议的大规模实验将测试新理论，并使用合成射流和弦向壁振荡产生的二次涡结构创建高雷诺数叶片尖端涡破裂的新知识。其知识意义在于，半经验模型描述了涡破裂所需的二次涡特性（例如长度/时间尺度、涡度），以及其对湍流动能的影响，据信湍流动能会引起叶片结构振动。流将使用立体粒子图像测速技术进行测量，并使用适当的正交分解（POD）以及从二维测量平面阵列的三维流重建进行分析。这些方法是唯一的大域高雷诺数流动。它们将用于阐明叶尖涡能含量/ POD模式，以及推进实验涡动力学领域，特别是在高雷诺数下。

项目成果

Aeroelastic response of a propulsive rotor blade with synthetic jets

• DOI: 10.1016/j.jfluidstructs.2021.103411
• 发表时间: 2021-11
• 期刊: Journal of Fluids and Structures
• 影响因子: 3.6
• 作者: V. Maldonado;Nicolas Peralta;Serdar Gorumlu;Wolduamlak Ayele;D. Santos

On the figure of merit and streamwise flow of a propulsive rotor with synthetic jets

• DOI: 10.1016/j.ast.2021.106712
• 发表时间: 2021-04
• 期刊: Aerospace Science and Technology
• 影响因子: 5.6
• 作者: V. Maldonado;N. Peralta;Serdar Gorumlu;Wolduamlak Ayele

Experiments and Simulations of a Propulsive Rotor with Synthetic Jets for Aerodynamic Performance Enhancement

用于增强空气动力学性能的带有合成喷嘴的推进转子的实验和模拟

• DOI: 10.2514/6.2021-1214
• 发表时间: 2021
• 期刊: Experiments and Simulations of a Propulsive Rotor with Synthetic Jets for Aerodynamic Performance Enhancement
• 作者: Peralta, Nicolas;Boyd, Logan;Gorumlu, Serdar;Maldonado, Victor
• 通讯作者: Maldonado, Victor