Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation

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ŠIROK, Brane ;POTOČAR, Erik ;NOVAK, Matej .
Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 46, n.6, p. 330-341, july 2017. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/analysis-of-the-flow-kinematics-behind-a-pulsating-adaptive-airfoil-using-computer-aided-visualisation/>. Date accessed: 04 dec. 2021. 
doi:http://dx.doi.org/.
Širok, B., Potočar, E., & Novak, M.
(2000).
Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation.
Strojniški vestnik - Journal of Mechanical Engineering, 46(6), 330-341.
doi:http://dx.doi.org/
@article{.,
	author = {Brane  Širok and Erik  Potočar and Matej  Novak},
	title = {Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {46},
	number = {6},
	year = {2000},
	keywords = {flow kinematics; flow analysis; flow structure; computer aided visualization; },
	abstract = {In the fully developed airflow of a non-return subsonic wind tunnel using flow visualization and a digital image-processing method, an experimental study of the flow kinematics along and behind a hollow NACA 4416 adaptive airfoil at Reynolds number Re = 1000 was performed. The study was performed in two parts: first the observation of flow transformation at temporal stationary changes of the airfoil shape was performed, and the second part of the analysis focused on the transformation of the flow at periodic time-pulsating airfoil deformations. The shape of a previously geometrically calibrated airfoil was modified with periodic pressure changes inside the airfoil. The basic frequency of the vortex street behind the airfoil is changed under the influence of the pulsating frequency of the airfoil. A CCD camera was used to capture smoke visualization images of the turbulent airflow wake, illuminated by the light sheet. A quantitative analysis was made on time series, obtained by simultaneous digitization of the grey level in several small areas (windows) of the overall image. The flow field along and behind the airfoil exhibited various frequency spectra and standard deviations. With the help of the computer-aided visualization method, structural flow changes were investigated, i.e. variations of the wake frequency response and respective amplitudes depending on the airfoil pulsation frequency. Results show that periodic changes of the airfoil shape have an affect on the flow structure along and behind the airfoil, i.e. the amplitude and frequency of the wake, and the location of a separation point. There may exist possibilities for adaptive flow kinematics variation along and behind the airfoil.},
	issn = {0039-2480},	pages = {330-341},	doi = {},
	url = {https://www.sv-jme.eu/article/analysis-of-the-flow-kinematics-behind-a-pulsating-adaptive-airfoil-using-computer-aided-visualisation/}
}
Širok, B.,Potočar, E.,Novak, M.
2000 July 46. Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 46:6
%A Širok, Brane 
%A Potočar, Erik 
%A Novak, Matej 
%D 2000
%T Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation
%B 2000
%9 flow kinematics; flow analysis; flow structure; computer aided visualization; 
%! Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation
%K flow kinematics; flow analysis; flow structure; computer aided visualization; 
%X In the fully developed airflow of a non-return subsonic wind tunnel using flow visualization and a digital image-processing method, an experimental study of the flow kinematics along and behind a hollow NACA 4416 adaptive airfoil at Reynolds number Re = 1000 was performed. The study was performed in two parts: first the observation of flow transformation at temporal stationary changes of the airfoil shape was performed, and the second part of the analysis focused on the transformation of the flow at periodic time-pulsating airfoil deformations. The shape of a previously geometrically calibrated airfoil was modified with periodic pressure changes inside the airfoil. The basic frequency of the vortex street behind the airfoil is changed under the influence of the pulsating frequency of the airfoil. A CCD camera was used to capture smoke visualization images of the turbulent airflow wake, illuminated by the light sheet. A quantitative analysis was made on time series, obtained by simultaneous digitization of the grey level in several small areas (windows) of the overall image. The flow field along and behind the airfoil exhibited various frequency spectra and standard deviations. With the help of the computer-aided visualization method, structural flow changes were investigated, i.e. variations of the wake frequency response and respective amplitudes depending on the airfoil pulsation frequency. Results show that periodic changes of the airfoil shape have an affect on the flow structure along and behind the airfoil, i.e. the amplitude and frequency of the wake, and the location of a separation point. There may exist possibilities for adaptive flow kinematics variation along and behind the airfoil.
%U https://www.sv-jme.eu/article/analysis-of-the-flow-kinematics-behind-a-pulsating-adaptive-airfoil-using-computer-aided-visualisation/
%0 Journal Article
%R 
%& 330
%P 12
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 46
%N 6
%@ 0039-2480
%8 2017-07-07
%7 2017-07-07
Širok, Brane, Erik  Potočar, & Matej  Novak.
"Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation." Strojniški vestnik - Journal of Mechanical Engineering [Online], 46.6 (2000): 330-341. Web.  04 Dec. 2021
TY  - JOUR
AU  - Širok, Brane 
AU  - Potočar, Erik 
AU  - Novak, Matej 
PY  - 2000
TI  - Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - flow kinematics; flow analysis; flow structure; computer aided visualization; 
N2  - In the fully developed airflow of a non-return subsonic wind tunnel using flow visualization and a digital image-processing method, an experimental study of the flow kinematics along and behind a hollow NACA 4416 adaptive airfoil at Reynolds number Re = 1000 was performed. The study was performed in two parts: first the observation of flow transformation at temporal stationary changes of the airfoil shape was performed, and the second part of the analysis focused on the transformation of the flow at periodic time-pulsating airfoil deformations. The shape of a previously geometrically calibrated airfoil was modified with periodic pressure changes inside the airfoil. The basic frequency of the vortex street behind the airfoil is changed under the influence of the pulsating frequency of the airfoil. A CCD camera was used to capture smoke visualization images of the turbulent airflow wake, illuminated by the light sheet. A quantitative analysis was made on time series, obtained by simultaneous digitization of the grey level in several small areas (windows) of the overall image. The flow field along and behind the airfoil exhibited various frequency spectra and standard deviations. With the help of the computer-aided visualization method, structural flow changes were investigated, i.e. variations of the wake frequency response and respective amplitudes depending on the airfoil pulsation frequency. Results show that periodic changes of the airfoil shape have an affect on the flow structure along and behind the airfoil, i.e. the amplitude and frequency of the wake, and the location of a separation point. There may exist possibilities for adaptive flow kinematics variation along and behind the airfoil.
UR  - https://www.sv-jme.eu/article/analysis-of-the-flow-kinematics-behind-a-pulsating-adaptive-airfoil-using-computer-aided-visualisation/
@article{{}{.},
	author = {Širok, B., Potočar, E., Novak, M.},
	title = {Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {46},
	number = {6},
	year = {2000},
	doi = {},
	url = {https://www.sv-jme.eu/article/analysis-of-the-flow-kinematics-behind-a-pulsating-adaptive-airfoil-using-computer-aided-visualisation/}
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TY  - JOUR
AU  - Širok, Brane 
AU  - Potočar, Erik 
AU  - Novak, Matej 
PY  - 2017/07/07
TI  - Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 46, No 6 (2000): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - flow kinematics, flow analysis, flow structure, computer aided visualization, 
N2  - In the fully developed airflow of a non-return subsonic wind tunnel using flow visualization and a digital image-processing method, an experimental study of the flow kinematics along and behind a hollow NACA 4416 adaptive airfoil at Reynolds number Re = 1000 was performed. The study was performed in two parts: first the observation of flow transformation at temporal stationary changes of the airfoil shape was performed, and the second part of the analysis focused on the transformation of the flow at periodic time-pulsating airfoil deformations. The shape of a previously geometrically calibrated airfoil was modified with periodic pressure changes inside the airfoil. The basic frequency of the vortex street behind the airfoil is changed under the influence of the pulsating frequency of the airfoil. A CCD camera was used to capture smoke visualization images of the turbulent airflow wake, illuminated by the light sheet. A quantitative analysis was made on time series, obtained by simultaneous digitization of the grey level in several small areas (windows) of the overall image. The flow field along and behind the airfoil exhibited various frequency spectra and standard deviations. With the help of the computer-aided visualization method, structural flow changes were investigated, i.e. variations of the wake frequency response and respective amplitudes depending on the airfoil pulsation frequency. Results show that periodic changes of the airfoil shape have an affect on the flow structure along and behind the airfoil, i.e. the amplitude and frequency of the wake, and the location of a separation point. There may exist possibilities for adaptive flow kinematics variation along and behind the airfoil.
UR  - https://www.sv-jme.eu/article/analysis-of-the-flow-kinematics-behind-a-pulsating-adaptive-airfoil-using-computer-aided-visualisation/
Širok, Brane, Potočar, Erik, AND Novak, Matej.
"Analysis of the Flow Kinematics Behind a Pulsating Adaptive Airfoil Using Computer-Aided Visualisation" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 46 Number 6 (07 July 2017)

Authors

Affiliations

  • University of Ljubljana, Faculty of Mechanical Engineering, Slovenia
  • Ministry of Science and Technology, Ljubljana, Slovenia
  • Turboinstute, Ljubljana, Slovenija

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 46(2000)6, 330-341

In the fully developed airflow of a non-return subsonic wind tunnel using flow visualization and a digital image-processing method, an experimental study of the flow kinematics along and behind a hollow NACA 4416 adaptive airfoil at Reynolds number Re = 1000 was performed. The study was performed in two parts: first the observation of flow transformation at temporal stationary changes of the airfoil shape was performed, and the second part of the analysis focused on the transformation of the flow at periodic time-pulsating airfoil deformations. The shape of a previously geometrically calibrated airfoil was modified with periodic pressure changes inside the airfoil. The basic frequency of the vortex street behind the airfoil is changed under the influence of the pulsating frequency of the airfoil. A CCD camera was used to capture smoke visualization images of the turbulent airflow wake, illuminated by the light sheet. A quantitative analysis was made on time series, obtained by simultaneous digitization of the grey level in several small areas (windows) of the overall image. The flow field along and behind the airfoil exhibited various frequency spectra and standard deviations. With the help of the computer-aided visualization method, structural flow changes were investigated, i.e. variations of the wake frequency response and respective amplitudes depending on the airfoil pulsation frequency. Results show that periodic changes of the airfoil shape have an affect on the flow structure along and behind the airfoil, i.e. the amplitude and frequency of the wake, and the location of a separation point. There may exist possibilities for adaptive flow kinematics variation along and behind the airfoil.

flow kinematics; flow analysis; flow structure; computer aided visualization;