Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
 
<< vorige    volgende >>
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 10 van 37 gevonden artikelen
 
 
  Flow Visualization and Aerodynamic-Force Measurement of a Dragonfly-Type Model
 
 
Titel: Flow Visualization and Aerodynamic-Force Measurement of a Dragonfly-Type Model
Auteur: Kim, S. H.
Chang, J. W.
Sohn, M. H.
Verschenen in: Journal of visualization
Paginering: Jaargang 11 (2008) nr. 1 pagina's 37-44
Jaar: 2008-07-06
Inhoud: An unsteady flow visualization and force measurement were carried out in order to investigate the effects of the reduced frequency of a dragonfly-type model. The flow visualization of the wing wake region was conducted by using a smoke wire technique. An electronic device was mounted below the test section in order to find the exact position angle of the wing for the visualization. A load-cell was employed in measuring aerodynamic forces generated by a plunging motion of the experimental model. To find the period of the flapping motion in real time, trigger signals were also collected by passing laser beam signals through the gear hole. Experimental conditions were as follows: the incidence angles of the fore-and hind wing were 0° and 10°, respectively, and the reduced frequencies were 0.150 and 0.225. The free-stream velocities of the flow visualization and force measurement were 1.0 and 1.6 m/sec, respectively, which correspond to Reynolds numbers of 3.4 × 10^3 and 2.9 × 10^3. The variations of the flow patterns and phase-averaged lift and the thrust coefficients during one cycle of the wing motion were presented. Results showed that the reduced frequency was closely related to the flow pattern that determined flight efficiency, and the maximum lift coefficient and lift coefficient per unit of time increased with reduced frequency.
Uitgever: IOS Press
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details van artikel 10 van 37 gevonden artikelen
 
<< vorige    volgende >>
 
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland