Suppression of flow separation of a high-lift wing with active flow control

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2025-02-05 DOI:10.1016/j.ast.2025.110017

Qiangqiang Sun , Faycal Bahri , Mark Jabbal , Wit Stryczniewicz , Richard Jefferson-Loveday , Bruno Stefes , Alexander Büscher

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Abstract

Flow separation caused by the integration of a leading edge slat cut-out to accommodate an ultra-high bypass ratio engine reduces the maximum lift coefficient. In this study, an active flow control approach including 88 pulsed jet nozzles near the leading edge is used to control flow separation over a multi-element high-lift aerofoil. A hybrid large-eddy simulation (LES) and stress-blended eddy simulation (SBES) method is deployed to analyze flow physics and wind tunnel tests are also performed for the flow with/without control. The results show that severe flow separation is observed for the clean case by visualizing the streamlines on the airfoil's surface via numerical and experimental methods. Compared with the clean case, the stall angle is delayed by around 4°, and the maximum lift coefficient is increased by more than 15% after deploying the active flow control. Meanwhile, when the active flow control is imposed, a lift enhancement region caused by the vortex shedding downstream of the jet nozzles is formed adjacent to the leading edge, and its scale becomes larger along the spanwise direction.

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主动气流控制抑制高升力机翼的气流分离

为了适应超高涵道比的发动机，发动机的前缘狭缝切割集成导致了流动分离，降低了最大升力系数。在本研究中，采用一种主动流动控制方法，包括前缘附近的88个脉冲射流喷嘴来控制多单元高升力翼型的流动分离。采用混合大涡模拟（LES）和应力混合涡模拟（SBES）方法进行了流动物理分析，并对有控制和无控制的流动进行了风洞试验。结果表明，通过数值和实验方法对翼型表面流线进行可视化分析，可以观察到清洁情况下严重的流动分离。与清洁情况相比，部署主动流量控制后，失速角延迟了约4°，最大升力系数提高了15%以上。同时，在进行主动流动控制时，前缘附近形成了由喷嘴下游旋涡脱落引起的升力增强区，其规模沿展向增大。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.