Experimental investigation of wake vortex in a water towing tank

2012 ◽  
Author(s):  
Yue Liu ◽  
Junwei Wang ◽  
Zhirong Liu ◽  
Feng Bao
Keyword(s):  
Experimental Investigation ◽  
Wake Vortex ◽  
Towing Tank

Wake Vortex Control Using Modified Flaps

2013 ◽  
Vol 365-366 ◽  
pp. 827-834
Author(s):  
Yi He ◽  
Jin Wen Yang ◽  
Feng Bao
Keyword(s):  
Experimental Investigation ◽  
Research Work ◽  
Experimental Results ◽  
Wake Vortex ◽  
Towing Tank ◽  
Labor Conditions ◽  
Vortex Control ◽  
Piv Measurement ◽  
Aircraft Wake

The present paper is on the experimental investigation of a potentially effective method to alleviate the strength of aircraft wake vortex. The research work was carried out in a water-towing tank which equipped with a 2-D PIV system. By using modified flaps attached to the baseline-airfoil, the Rayleigh-Ludwieg instability of the wake vortex was activated, resulting in a premature dissipation of the wake vortex. The experimental results of PIV measurement exhibited that the circulation of the wake vortex was reduced to over 50% for the optimal case at 45 wingspans downstream with suitable settings, which proved the effectiveness of the modified-flap treatment in alleviating the wake vortex under labor conditions.

An experimental investigation by towing tank on VIV of a long flexible cylinder for deepwater riser application

2013 ◽  
Vol 18 (3) ◽  
pp. 358-369 ◽  
Author(s):  
Jijun Gu ◽  
Marcelo Vitola ◽  
Jairo Coelho ◽  
Waldir Pinto ◽  
Menglan Duan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Flexible Cylinder ◽  
Towing Tank ◽  
Deepwater Riser

A Novel Method for Generating Continuously Surfable Waves: Comparison of Predictions With Experimental Results

2011 ◽  
Author(s):  
Steven A. Schmied ◽  
Jonathan R. Binns ◽  
Martin R. Renilson ◽  
Giles A. Thomas ◽  
Gregor J. Macfarlane ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Experimental Investigation ◽  
Wave Breaking ◽  
Breaking Waves ◽  
Experimental Results ◽  
Pressure Source ◽  
Towing Tank ◽  
Novel Method ◽  
The Waves

In this paper, a novel idea to produce continuous breaking waves is discussed, whereby a pressure source is rotated within an annular wave pool. The concept is that the inner ring of the annulus has a sloping bathymetry to induce wave breaking from the wake of the pressure source. In order to refine the technique, work is being conducted to better understand the mechanics of surfable waves generated by moving pressure sources in restricted water. This paper reports on the first stage of an experimental investigation of a novel method for generating continuously surfable waves utilising a moving pressure source. The aim was to measure and assess the waves generated by two parabolic pressure sources and a wavedozer [1] for their suitability for future development of continuous breaking surfable waves. The tests were conducted at the Australian Maritime College (AMC), University of Tasmania (UTas) 100 metre long towing tank. The experimental results as variations in wave height (H) divided by water depth (h) as functions of depth Froude number (Frh) and h, together with predictions from both methods, are presented in this paper. Finally, measures of the wave making energy efficiency of each pressure source, and the surfable quality of the waves generated by it, were developed and are presented.

The Instability of a Four-Vortex Wake System in a Water Towing Tank

2013 ◽  
Vol 756-759 ◽  
pp. 1484-1488
Author(s):  
Yi He ◽  
Jin Wen Yang ◽  
Feng Bao
Keyword(s):  
Interaction Process ◽  
Wake Vortex ◽  
Vortex Wake ◽  
Towing Tank ◽  
Piv Measurement

A simplified rectangular baseline-airfoil model attached with tailored flaps was designed to study the Rayleigh-Ludwieg instability by tailoring a four-vortex wake system. By means of PIV measurement in a water towing tank, the interaction process and circulation evolution of the wake system were obtained systematically. The circulation remains was reduced to ca. 40% after 43 wingspans which proved the application potentials of this method in alleviating the wake vortex.

Traversing field of view and AR-PIV for mid-field wake vortex investigation in a towing tank

2002 ◽  
Vol 33 (6) ◽  
pp. 950-961 ◽  
Author(s):  
F. Scarano ◽  
C. van Wijk ◽  
L. Veldhuis
Keyword(s):  
Field Of View ◽  
Wake Vortex ◽  
Towing Tank
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