Effect of oscillations on airfoils in close proximity to the ground

被引:48
|
作者
Moryossef, Y [1 ]
Levy, Y [1 ]
机构
[1] Technion Israel Inst Technol, IL-32000 Haifa, Israel
关键词
D O I
10.2514/1.6380
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
Numerical simulations are conducted to study the flowfield about oscillating airfoils in close proximity to the ground. Inviscid and viscous turbulent flow simulations are conducted by the use of a full Navier-Stokes code and a one-equation, topology-free turbulence model. Comparison of results from fixed airfoil simulations suggest that inviscid flow assumptions are valid only for a moderate to high distances from the ground. Viscous flow simulations reaffirm the so-called down-force reduction phenomenon. The viscous flow simulations about an oscillating airfoil show that at close proximity to the ground and low reduced frequencies, viscous effects are dominant, whereas at high reduced frequencies the behavior resembles that of inviscid flows. Inviscid flow simulations about an oscillating airfoil show that as the ground clearance decreases, the total thrust that is created due to the airfoil motion increases. The results point to an approximated relation between the thrust and the reduced frequency. It is also shown that the lift phase lag behavior concerning the flow about an oscillating airfoil in close proximity to the ground is different in nature than the classical behavior of oscillating airfoils in freestream. Consequently, the amplitude of the lift force approaches a nonzero value for reduced frequencies approaching zero.
引用
收藏
页码:1755 / 1764
页数:10
相关论文
共 50 条
  • [1] Aperture Effect of Normal Hovering Flight in Close Proximity to the Ground
    Zhou, Xinping
    Huang, Yong
    [J]. TECHNICAL PHYSICS LETTERS, 2022, 48 (14) : 63 - 65
  • [2] Unsteady flow and noise characteristics of wing in ground effect at close proximity
    Moon, YJ
    Koh, SR
    Seo, JH
    Yoon, YH
    Cho, JS
    [J]. COMPUTATIONAL FLUID DYNAMICS 2002, 2003, : 719 - 724
  • [3] Aerodynamic analysis of the boundary layer region of symmetric airfoils at ground proximity
    Ghadimi, Parviz
    Rostami, Ali Bakhshandeh
    Jafarkazemi, Farzad
    [J]. AEROSPACE SCIENCE AND TECHNOLOGY, 2012, 17 (01) : 7 - 20
  • [4] Sound radiation of a railway rail in close proximity to the ground
    Zhang, Xianying
    Squicciarini, Giacomo
    Thompson, David J.
    [J]. JOURNAL OF SOUND AND VIBRATION, 2016, 362 : 111 - 124
  • [5] The proximity effect in a close group of QSOs
    Liske, J
    Williger, GM
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 328 (02) : 653 - 668
  • [6] JET-FLAPPED WINGS IN VERY CLOSE PROXIMITY TO GROUND
    KIDA, T
    MIYAI, Y
    [J]. AIAA JOURNAL, 1972, 10 (05) : 611 - &
  • [7] Design of a Broadband Dipole in Close Proximity to an EBG Ground Plane
    Best, Steven R.
    Hanna, Drayton L.
    [J]. IEEE ANTENNAS AND PROPAGATION MAGAZINE, 2008, 50 (06) : 52 - 64
  • [8] CFD analysis of the performance of different airfoils in ground effect
    Zaheer, Zubin
    Roy, K. E. Reby
    Nair, Gopakumar S.
    Ragipathi, Vineeth
    Niranjan, U., V
    [J]. INTERNATIONAL CONFERENCE ON AEROSPACE AND MECHANICAL ENGINEERING, 2019, 1355
  • [9] Aeroelastic Behavior of Two Airfoils in Proximity
    Dhital, Kailash
    Han, Jae-Hung
    [J]. AIAA JOURNAL, 2021, 60 (04) : 2522 - 2532