Roll stall and the vortex-induced aerodynamic of low-aspect-ratio fliers

低展弦比飞行器的滚转失速和涡流引起的空气动力学

基本信息

  • 批准号:
    1805776
  • 负责人:
  • 金额:
    $ 30万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2018
  • 资助国家:
    美国
  • 起止时间:
    2018-09-01 至 2021-08-31
  • 项目状态:
    已结题

项目摘要

The design and development of highly-maneuverable aircraft has been a long-standing engineering challenge. This challenge presents itself in almost all flight regimes, from supersonic fighter jets down to low-speed, smaller-scale unmanned aircraft. Despite the very different operating conditions, there is at least one common feature among aircraft designs aiming to provide very agile, yet stable, flight. Namely, the planforms (the shape and layout of an airplane's wing) of such aircraft are of low aspect ratio. Recent studies suggest that the aerodynamic and gust-response of such low aspect ratio fliers are significantly different than larger flyers and not well understood. This issue constitutes a critical gap in aerial vehicle development, and this research project addresses a critical gap in the development of reliable and fully controllable aerial drones. The researchers will also enhance course curricula with results from this research, and a course on unsteady low Reynolds number aerodynamics will be developed. A summer program is proposed that will enable local high school students to learn aerodynamics and flight concepts and to participate in a design/build/operate competition integrating fluid dynamics, aerodynamics, and aircraft design. This research project takes a fresh look into new features of steady and unsteady aerodynamics of low aspect ratio wings. Recent discoveries of complex aerodynamic flow-structure interactions have been attributed to an inherent coupling of lateral and longitude loadings and these are unique to low aspect ratio flyers. These phenomena are, in turn, related to the vortex-dominated flow generated by such wings. The proposed work is divided into three main research thrusts. (i) The prediction of flow separation, (ii) The connection between unsteady vortex generation of low-aspect-ratio surfaces and the instantaneous loadings, and (iii) Understanding of how key changes to the vortex topology over a wing in cross-flow modify the asymmetric wing loading. Flow field measurements using digital particle image velocimetry and direct force/moment measurements are correlated with the vortex structures in the flow. Some theoretical modeling will also complement the experimental effort. This knowledge may motivate unique flow control or wing morphing strategies during flight in gusty environments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
高机动性飞机的设计和开发一直是一个长期存在的工程挑战。这一挑战几乎出现在所有的飞行模式中,从超音速战斗机到低速、小型无人驾驶飞机。尽管操作条件非常不同,但在飞机设计中至少有一个共同的特点,旨在提供非常灵活而稳定的飞行。也就是说,这种飞机的平台(飞机机翼的形状和布局)是低宽高比的。最近的研究表明,这种低展弦比飞行器的空气动力学和阵风响应与大飞行器有显著不同,但尚未得到很好的理解。这一问题构成了飞行器发展的关键空白,本研究项目解决了可靠、完全可控的空中无人机发展的关键空白。研究人员还将利用该研究成果加强课程设置,并将开设一门非定常低雷诺数空气动力学课程。提出了一个夏季项目,使当地高中生能够学习空气动力学和飞行概念,并参与设计/建造/操作竞赛,将流体动力学、空气动力学和飞机设计结合起来。本课题对低展弦比机翼定常与非定常气动特性进行了全新的研究。最近发现的复杂气动流动结构相互作用归因于横向和纵向载荷的固有耦合,这是低展弦比飞行器所特有的。这些现象反过来又与这种机翼产生的旋涡主导的流动有关。拟议的工作分为三个主要的研究重点。(i)流动分离的预测,(ii)低展弦比表面的非定常涡产生与瞬时载荷之间的联系,以及(iii)了解机翼上的涡流拓扑结构在横流中的关键变化如何改变机翼的非对称载荷。采用数字粒子图像测速和直接力/力矩测量的流场测量与流动中的涡结构相关。一些理论模型也将补充实验工作。这一知识可以激发独特的气流控制或机翼变形策略,在大风环境中飞行。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A Modification to the Weissinger Vortex Arrangement for the Prediction of Stability Derivatives Due to Sideslip for Low-Aspect-Ratio Wings
魏辛格涡排列的修正用于预测低展弦比机翼侧滑引起的稳定性导数
  • DOI:
    10.2514/6.2018-1081
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Linehan, Thomas I.;Mohseni, Kamran
  • 通讯作者:
    Mohseni, Kamran
On the maintenance of an attached leading-edge vortex via model bird alula
  • DOI:
    10.1017/jfm.2020.364
  • 发表时间:
    2020-08-25
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    Linehan, Thomas;Mohseni, Kamran
  • 通讯作者:
    Mohseni, Kamran
Theoretical Prediction of Roll Moment Due to Sideslip for Thin Low-Aspect-Ratio Wings
  • DOI:
    10.2514/1.j057160
  • 发表时间:
    2019-03
  • 期刊:
  • 影响因子:
    2.5
  • 作者:
    Thomas Linehan;K. Mohseni
  • 通讯作者:
    Thomas Linehan;K. Mohseni
Theoretical model for the separated flow around an accelerating flat plate using time-dependent self-similarity
  • DOI:
    10.1103/physrevfluids.6.054701
  • 发表时间:
    2021-05-10
  • 期刊:
  • 影响因子:
    2.7
  • 作者:
    DeVoria, A. C.;Mohseni, K.
  • 通讯作者:
    Mohseni, K.
The vortex-entrainment sheet in an inviscid fluid: theory and separation at a sharp edge
  • DOI:
    10.1017/jfm.2019.134
  • 发表时间:
    2018-01
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    A. DeVoria;K. Mohseni
  • 通讯作者:
    A. DeVoria;K. Mohseni
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Kamran Mohseni其他文献

On the Effect of Pipe Boundary Layer Growth on the Formation of a Laminar Vortex Ring Generated by a Piston/Cylinder Arrangement
  • DOI:
    10.1007/s001620100051
  • 发表时间:
    2002-05-01
  • 期刊:
  • 影响因子:
    2.800
  • 作者:
    Michael Shusser;Morteza Gharib;Moshe Rosenfeld;Kamran Mohseni
  • 通讯作者:
    Kamran Mohseni
Analyzing deformations in fiber-reinforced soft membranes undergoing axisymmetric inflation: Continuum model and experimental validation
分析轴对称膨胀下纤维增强软膜的变形:连续介质模型与实验验证
  • DOI:
    10.1016/j.euromechsol.2024.105303
  • 发表时间:
    2024-07-01
  • 期刊:
  • 影响因子:
    4.200
  • 作者:
    Austin Moss;Kamran Mohseni
  • 通讯作者:
    Kamran Mohseni
A unified model for Digitized Heat Transfer in a microchannel
  • DOI:
    10.1016/j.ijheatmasstransfer.2014.06.018
  • 发表时间:
    2014-11-01
  • 期刊:
  • 影响因子:
  • 作者:
    Peter Zhang;Kamran Mohseni
  • 通讯作者:
    Kamran Mohseni
Observations on the flow structures and transport in a simulated warm-core ring in the Gulf of Mexico
  • DOI:
    10.1007/s10236-013-0674-5
  • 发表时间:
    2013-12-27
  • 期刊:
  • 影响因子:
    1.900
  • 作者:
    Doug Lipinski;Kamran Mohseni
  • 通讯作者:
    Kamran Mohseni
A theory on leading-edge vortex stabilization by spanwise flow
  • DOI:
    10.1017/jfm.2023.613
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
  • 作者:
    Xi Xia;Kamran Mohseni
  • 通讯作者:
    Kamran Mohseni

Kamran Mohseni的其他文献

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{{ truncateString('Kamran Mohseni', 18)}}的其他基金

NRI: Operating in the Abyss: Bringing Together Humans and Bio-Inpsired Autonomous Vehicles for Maritime Applications
NRI:在深渊中运作:将人类和仿生自动驾驶车辆结合起来用于海事应用
  • 批准号:
    1638034
  • 财政年份:
    2016
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Microscale Heat Transfer in Digital Microfluidics
数字微流体中的微尺度传热
  • 批准号:
    1403828
  • 财政年份:
    2014
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Observable Divergence Theorem: A new technique for deriving averaged equations for multi-scale shock problems
可观测散度定理:一种推导多尺度冲击问题平均方程的新技术
  • 批准号:
    1134229
  • 财政年份:
    2011
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Digitized Heat Transfer: A New Paradigm for Thermal Management of Compact Micro Systems
数字化传热:紧凑型微型系统热管理的新范式
  • 批准号:
    1145009
  • 财政年份:
    2011
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Kinematics and Hydrodynamics of Aquatic Jet Bio-Propulsion
水上喷射生物推进的运动学和流体动力学
  • 批准号:
    0854542
  • 财政年份:
    2009
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Digitized Heat Transfer: A New Paradigm for Thermal Management of Compact Micro Systems
数字化传热:紧凑型微型系统热管理的新范式
  • 批准号:
    0756505
  • 财政年份:
    2008
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
SGER: Electrowetting Actuation of Droplets for Cooling of Integrated Circuits
SGER:用于冷却集成电路的液滴电润湿驱动
  • 批准号:
    0540004
  • 财政年份:
    2006
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant
Collaborative Research: Pulsatile Jet Propulsion for Underwater Robots
合作研究:水下机器人脉动喷射推进
  • 批准号:
    0413300
  • 财政年份:
    2005
  • 资助金额:
    $ 30万
  • 项目类别:
    Continuing Grant
ITR - (NHS+ASE+ECS) - (dmc+sim+int): Loosely Cooperating Micro Air Vehicle Networks for Toxic Plume Characterization
ITR - (NHS ASE ECS) - (dmc sim int):用于有毒羽流表征的松散合作微型飞行器网络
  • 批准号:
    0427947
  • 财政年份:
    2004
  • 资助金额:
    $ 30万
  • 项目类别:
    Standard Grant

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Verification of Unstable Flow Mechanism due to Inducer Tip Leakage Vortex in a Centrifugal Blower
离心鼓风机中导流尖端泄漏涡流不稳定流动机制的验证
  • 批准号:
    16560152
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  • 批准号:
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Analysis and Control of Unsteady Three-Dimensional Vortical Flow Structure in Complex Flow Fields
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  • 批准号:
    13305014
  • 财政年份:
    2001
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    $ 30万
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Numerical Investigation of Unsteady Flow in an Axial Flow Turbomachineries
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  • 批准号:
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Synthetic Study on Unstable Flow Phenomena in Turbomachineries under Extreme Operating Conditions and the Flow Control and Advance Detection
极端工况下透平机械不稳定流动现象及流量控制与提前检测综合研究
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    10555061
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    1998
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    04452142
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