Measurements in the wake of a ventilated hydrofoil: A step towards improved turbine aeration techniques

C. Ellis; A. Karn; J. Hong; S. J. Lee; E. Kawakami; D. Scott; J. Gulliver; R. E A Arndt

doi:10.1088/1755-1315/22/6/062009

Measurements in the wake of a ventilated hydrofoil: A step towards improved turbine aeration techniques

C. Ellis, A. Karn, J. Hong, S. J. Lee, E. Kawakami, D. Scott, J. Gulliver, R. E A Arndt

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Scopus citations

Abstract

The purpose of this study is to develop the necessary algorithms to determine the bubble size distribution and velocity in the wake of a ventilated or cavitating hydrofoil utilizing background illumination. A simplified experiment was carried out to validate the automatic bubble detection algorithm at the Saint Anthony Falls Laboratory (SAFL) of the University of Minnesota. The experiment was conducted in the SAFL high-speed water tunnel. First, particle shadow velocimetry (PSV) images of a bubbly flow were collected. Bubbles were identified in the images using an edge detection method based on the Canny algorithm. The utilized algorithm was designed to detect partly overlapping bubbles and reconstruct missing parts. After all images were analyzed, the bubble velocity was determined by applying a tracking algorithm. This study has shown that the algorithm enables reliable analysis of irregularly shaped bubbles even when bubbles are highly overlapped in the wake of the ventilated hydrofoil. It is expected that this technique can be used to determine the bubble velocity field as well as the bubble size distributions.

Original language	English (US)
Title of host publication	IOP Conference Series: Earth and Environmental Science
Publisher	Institute of Physics Publishing
Volume	22
DOIs	https://doi.org/10.1088/1755-1315/22/6/062009
State	Published - 2014
Event	27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014 - Montreal, Canada Duration: Sep 22 2014 → Sep 26 2014

Other

Other	27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014
Country/Territory	Canada
City	Montreal
Period	9/22/14 → 9/26/14

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10.1088/1755-1315/22/6/062009

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Ellis, C., Karn, A., Hong, J., Lee, S. J., Kawakami, E., Scott, D., Gulliver, J., & Arndt, R. E. A. (2014). Measurements in the wake of a ventilated hydrofoil: A step towards improved turbine aeration techniques. In IOP Conference Series: Earth and Environmental Science (Vol. 22). Article 062009 Institute of Physics Publishing. https://doi.org/10.1088/1755-1315/22/6/062009

Ellis, C, Karn, A, Hong, J, Lee, SJ, Kawakami, E, Scott, D, Gulliver, J & Arndt, REA 2014, Measurements in the wake of a ventilated hydrofoil: A step towards improved turbine aeration techniques. in IOP Conference Series: Earth and Environmental Science. vol. 22, 062009, Institute of Physics Publishing, 27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014, Montreal, Canada, 9/22/14. https://doi.org/10.1088/1755-1315/22/6/062009

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AU - Kawakami, E.

AU - Scott, D.

AU - Gulliver, J.

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N2 - The purpose of this study is to develop the necessary algorithms to determine the bubble size distribution and velocity in the wake of a ventilated or cavitating hydrofoil utilizing background illumination. A simplified experiment was carried out to validate the automatic bubble detection algorithm at the Saint Anthony Falls Laboratory (SAFL) of the University of Minnesota. The experiment was conducted in the SAFL high-speed water tunnel. First, particle shadow velocimetry (PSV) images of a bubbly flow were collected. Bubbles were identified in the images using an edge detection method based on the Canny algorithm. The utilized algorithm was designed to detect partly overlapping bubbles and reconstruct missing parts. After all images were analyzed, the bubble velocity was determined by applying a tracking algorithm. This study has shown that the algorithm enables reliable analysis of irregularly shaped bubbles even when bubbles are highly overlapped in the wake of the ventilated hydrofoil. It is expected that this technique can be used to determine the bubble velocity field as well as the bubble size distributions.

AB - The purpose of this study is to develop the necessary algorithms to determine the bubble size distribution and velocity in the wake of a ventilated or cavitating hydrofoil utilizing background illumination. A simplified experiment was carried out to validate the automatic bubble detection algorithm at the Saint Anthony Falls Laboratory (SAFL) of the University of Minnesota. The experiment was conducted in the SAFL high-speed water tunnel. First, particle shadow velocimetry (PSV) images of a bubbly flow were collected. Bubbles were identified in the images using an edge detection method based on the Canny algorithm. The utilized algorithm was designed to detect partly overlapping bubbles and reconstruct missing parts. After all images were analyzed, the bubble velocity was determined by applying a tracking algorithm. This study has shown that the algorithm enables reliable analysis of irregularly shaped bubbles even when bubbles are highly overlapped in the wake of the ventilated hydrofoil. It is expected that this technique can be used to determine the bubble velocity field as well as the bubble size distributions.

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Measurements in the wake of a ventilated hydrofoil: A step towards improved turbine aeration techniques

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