NDLI: Experimental investigation on the wing-wake interaction at the mid stroke in hovering flight of dragonfly

Please wait, while we are loading the content...

Longitudinal, transverse, density-of-states, and conductivity masses of electrons in (001), (101) and (111) biaxially-strained-Si and strained-Si$_{1−x }$Ge$_{ x }$

Theoretical investigation on tunneling magnetoresistance in ferromagnetic/anti-ferromagnetic core/shell system

Phase-field crystal modeling of shape transition of strained islands in heteroepitaxy

The Glauber model correction towards equilibrium

Mechanical property and irradiation damage of China Low Activation Martensitic (CLAM) steel

An experiment-library least-squares method on on-line coal element contents analysis

Effects of ion bombardment on microcrystalline silicon growth by inductively coupled plasma assistant magnetron sputtering

A new approach to the time evolution of characteristic function of the density operator obtained by virtue of thermal entangled state representation

Quantum discord in the three-spin XXZ chain with Dzyaloshinskii-Moriya interaction

Two coplanar cracks in a functionally graded piezoelectric material strip under mechanical and transient thermal loadings

Nonholonomic motion planning for a free-falling cat using spline approximation

Variational bounds of the effective moduli of piezoelectric composites

Nonlinear vibration of edged cracked FGM beams using differential quadrature method

Inhomogeneity problem with a sliding interface under remote shearing stress

Variation of stress intensity factors for several interface crack problems under arbitrary material combinations

A study on mechanical behavior of the carbon fiber composite sandwich panel with pyramidal truss cores at different temperatures

A new method for modeling thermo-mechanical behaviors of polycrystalline aggregates

Thickness-stretch vibration of a crystal plate carrying a micro-rod array

A new look on wetting models: continuum analysis

Experimental investigation on the wing-wake interaction at the mid stroke in hovering flight of dragonfly

The gamma-ray spectral index changes for blazars

Estimation of the inter-frequency clock bias for the satellites of PRN25 and PRN01

Microstructures of the interlayer in Mo/Si multilayers induced by proton irradiation

Science in China Series G : Volume 55, Issue 10, October 2012

Science in China Series G : Volume 55, Issue 9, September 2012

Science in China Series G : Volume 55, Issue 8, August 2012

Science in China Series G : Volume 55, Issue 7, July 2012

Science in China Series G : Volume 55, Issue 6, June 2012

Science in China Series G : Volume 55, Issue 5, May 2012

Science in China Series G : Volume 55, Issue 4, April 2012

Science in China Series G : Volume 55, Issue 3, March 2012

Science in China Series G : Volume 55, Issue 2, February 2012

Science in China Series G : Volume 55, Issue 1, January 2012

Science in China Series G : Volume 54

Science in China Series G : Volume 53

Science in China Series G : Volume 52

Science in China Series G : Volume 51

Science in China Series G : Volume 50

Science in China Series G : Volume 49

Science in China Series G : Volume 48

Science in China Series G : Volume 47

Science in China Series G : Volume 46

Experimental investigation on the wing-wake interaction at the mid stroke in hovering flight of dragonfly

Content Provider	Springer Nature Link
Author	Lai, GuoJun Shen, GongXin
Copyright Year	2012
Abstract	This paper focuses on flow structures of the wing-wake interaction between the hind wing and the wake of the forewing in hovering flight of a dragonfly since there are arguments whether the wing-wake interaction is useful or not. A mechanical flapping model with two tandem wings is used to study the interaction. In the device, two identical simplified model wings are mounted to the flapping model and they are both scaled up to keep the Reynolds number similar to those of dragonfly in hovering flight since our experiment is conducted in a water tank. The kinetic pattern of dragonfly (Aeschna juncea) is chosen because of its special interesting asymmetry. A multi-slice phase-locked stereo particle image velocimetry (PIV) system is used to record flow structures around the hind wing at the mid downstroke (t/T=0.25) and the mid upstroke (t/T=0.75). To make comparison of the flow field between with and without the influence of the wake, flow structures around a single flapping wing (hind wing without the existence of the forewing) at these two stroke phases are also recorded. A local vortex identification scheme called swirling strength is applied to determine the vortices around the wing and they are visualized with the iso-surface of swirling strength. This paper also presents contour lines of ω $_{ z }$ at each spanwise position of the hind wing, the vortex core position of the leading edge vortex (LEV) of hind wing with respect to the upper surface of hind wing, the circulation of the hind wing LEV at each spanwise position and so on. Experimental results show that dimension and strength of the hind wing LEV are impaired at the mid stroke in comparison with the single wing LEV because of the downwash from the forewing. Our results also reveal that a wake vortex from the forewing traverses the upper surface of the hind wing at the mid downstroke and its distance to the upper surface is about 40% of the wing chord length. At the instant, the distance of the hind wing LEV to the upper surface is about 20% of the wing chord length. Thus, there must be a wing-wake interaction mechanism that makes the wake vortex become an additional LEV of the hind wing and it can partly compensate the hind wing for its lift loss caused by the downwash from the forewing.
Starting Page	2167
Ending Page	2178
Page Count	12
File Format	PDF
ISSN	16747348
Journal	Science in China Series G
Volume Number	55
Issue Number	11
e-ISSN	18691927
Language	English
Publisher	SP Science China Press
Publisher Date	2012-09-20
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dragonfly hovering flight particle image velocimetry (PIV) flow interaction leading edge vortex Classical Continuum Physics Astronomy, Observations and Techniques Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Wing tip vortex structure behind an airfoil with flaps at the tip

Flow diagnostics in a vortex furnace by particle image velocimetry

Phasing of dragonfly wings can improve aerodynamic efficiency by removing swirl

Experimental investigation of some aspects of insect-like flapping flight aerodynamics for application to micro air vehicles

Proper Orthogonal Decomposition and Particle Image Velocimetry

Proper orthogonal decomposition and particle image velocimetry.

Particle image velocimetry (PIV) measurements of tip vortex wake structure of wind turbine

Experimental investigation of a helical vortex pair

Data from: Hovering hummingbird wing aerodynamics during the annual cycle (Dataset)

Experimental investigation on the wing-wake interaction at the mid stroke in hovering flight of dragonfly

Similar Documents

Wing tip vortex structure behind an airfoil with flaps at the tip

Flow diagnostics in a vortex furnace by particle image velocimetry

Phasing of dragonfly wings can improve aerodynamic efficiency by removing swirl

Experimental investigation of some aspects of insect-like flapping flight aerodynamics for application to micro air vehicles

Proper Orthogonal Decomposition and Particle Image Velocimetry

Proper orthogonal decomposition and particle image velocimetry.

Particle image velocimetry (PIV) measurements of tip vortex wake structure of wind turbine

Experimental investigation of a helical vortex pair

Data from: Hovering hummingbird wing aerodynamics during the annual cycle (Dataset)

Experimental investigation on the wing-wake interaction at the mid stroke in hovering flight of dragonfly