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Unsteady Aerodynamics of Wings in Extreme Conditions

极端条件下机翼的非定常空气动力学

基本信息

批准号：
EP/M022307/1
负责人：
Ismet Gursul
金额：
$ 41.68万
依托单位：
University of Bath
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2015
资助国家：
英国
起止时间：
2015 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FM022307%2F1
关键词：
Unsteady Aerodynamics Wings Extreme Conditions

项目摘要

Currently aircraft designers must design for the worst case scenario plus a safety factor. This worst case scenario is always at the edge of the performance envelope and is associated with extreme manoeuvres and /or gusts. The aerodynamic flow over thse cases is characterised by highly unsteady, separated flow regions and possibly vortical interactions. Despite the importance of these extreme cases in dictating the aircraft structure very little is known about these highly separated flows and the current theoretical models are poor at predicting the unsteady forces. The aim of this project is to achieve a complete understanding of the unsteady aerodynamic behaviour of generic wings in extreme conditions involving plunging motion near the stall angle. This improved knowledge of the vortical flows, and their influence on aerodynamic force generation, will be used to develop accurate reduced-order models, to improve the accuracy of numerical simulations and to develop effective high-frequency load control strategies. The proposed project will address these aspects through a combined experimental (University of Bath) and computational (University of Southampton) approach using state of the art facilities.The benefits of this increased understanding of the highly separated flows, accurate reduced-order models and accurate numerical simulations will aid aircraft designers by removing some of the uncertainty that surrounds flight at the limits of the performance envelope. In addition, the high-frequency loads control strategies are a potentially feasible method of then controlling and limiting these extreme loads. Hence, the aircraft design can not only predict with greater accuracy but also control. Both elements will allow for lighter, more fuel efficient aircraft.

目前，飞机设计者必须为最坏的情况加上安全系数进行设计。这种最坏的情况总是在性能包络的边缘，并且与极端的机动和/或阵风相关联。在这些情况下的气动流动的特点是高度非定常，分离的流区和可能的涡旋相互作用。尽管这些极端情况在决定飞机结构方面很重要，但人们对这些高度分离的流动知之甚少，而且目前的理论模型在预测非恒定力方面很差。本项目的目的是全面了解通用机翼在极端条件下的非定常气动行为，包括失速角附近的俯冲运动。这种对涡流及其对气动力产生的影响的改进知识将被用来开发精确的降阶模型，提高数值模拟的精度，并开发有效的高频负载控制策略。拟议的项目将利用最先进的设施，通过实验(巴斯大学)和计算(南安普顿大学)相结合的方法来解决这些方面的问题。这种对高度分离流动的深入了解、准确的降阶模型和准确的数值模拟的好处将有助于飞机设计者消除在性能范围限制下飞行的一些不确定性。此外，高频负载控制策略是控制和限制这些极端负载的一种潜在的可行方法。因此，飞机的设计不仅可以更准确地预测，而且可以控制。这两个要素都将使飞机变得更轻、更省油。