Experimental study of shear layer instability below a free surface

2015 ◽  
Vol 27 (11) ◽  
pp. 112103 ◽  
Author(s):  
Matthieu A. André ◽  
Philippe M. Bardet
Keyword(s):  
Experimental Study ◽  
Free Surface ◽  
Shear Layer ◽  
Shear Layer Instability

Prediction of free surface waves induced by shear layer instability on liquid jet

2004 ◽  
Vol 2004 (0) ◽  
pp. 209
Author(s):  
Masataka INOUE ◽  
Kazuhiro ITOH ◽  
Hiroshige KUMAMARU ◽  
Yutaka KUKITA
Keyword(s):  
Free Surface ◽  
Surface Waves ◽  
Shear Layer ◽  
Liquid Jet ◽  
Shear Layer Instability ◽  
Free Surface Waves

An Experimental Study of a Free-Surface Shear Layer With and Without the Presence of Surfactants

2002 ◽  
Author(s):  
Amy Wamcke Lang ◽  
Carlos E. Manglano
Keyword(s):  
Experimental Study ◽  
Surface Tension ◽  
Free Surface ◽  
Shear Layer ◽  
Turbulence Intensity ◽  
Shear Flows ◽  
Surface Shear ◽  
Surface Deformations

A free-surface shear layer was studied to ascertain the effects due to the presence of surface tension gradients on the directional shift of the shear layer and turbulence intensities in the vicinity of the water free-surface. It was found that the presence of surfactants altered the direction of the shear layer in the vicinity of the free surface, with the shear layer being pulled to the higher surface tension side. In addition, the turbulence intensity in the plane of the free surface was dramatically reduced, also leading to damped surface deformations. These results show conclusively that the role surfactants play in turbulent free-surface shear flows needs to be considered.

Experimental study of shear-layer/acoustics coupling in Mach 5 cavity flow

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 242-252
Author(s):  
O. H. Unalmis ◽  
N. T. Clemens ◽  
D. S. Dolling
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Cavity Flow

Shear-layer acoustic radiation in an excited subsonic jet: experimental study

2005 ◽  
Vol 333 (10) ◽  
pp. 746-753 ◽  
Author(s):  
Vincent Fleury ◽  
Christophe Bailly ◽  
Daniel Juvé
Keyword(s):  
Experimental Study ◽  
Shear Layer ◽  
Acoustic Radiation ◽  
Subsonic Jet

scholarly journals Experimental study of immersion ratio and shaft inclination angle in the performance of a surface-piercing propeller

2019 ◽  
Vol 10 (1) ◽  
pp. 153-167
Author(s):  
Seyyed Mostafa Seyyedi ◽  
Rouzbeh Shafaghat ◽  
Mohioddin Siavoshian
Keyword(s):  
Experimental Study ◽  
Free Surface ◽  
Surface Water ◽  
Inclination Angle ◽  
Superior Performance ◽  
Design Parameters ◽  
Water Tunnel ◽  
Hydrodynamic Coefficients ◽  
Thrust And Torque ◽  
Surface Piercing Propeller

Abstract. Surface-piercing propellers have been widely used in light and high-speed vessels because of their superior performance. Experimental study of these propellers is one of the most reliable and accurate ways which can provide details about the performance and effect of different design parameters on the performance of the surface-piercing propellers. In this research, a five-blade surface-piercing propeller was tested in the free surface water tunnel of Babol Noshirvani University of Technology in order to expand the available experimental data and database for future engineering designs. The effects of immersion ratio and shaft inclination angle on the propeller's efficiency and hydrodynamic coefficients were examined. A free surface water tunnel and a calibrated dynamometer with the measurability of the thrust forces and the torque of a propeller were used for this purpose. Comparing the obtained results with the existing semi-experimental equations shows that the equations presented in various geometric conditions are not accurate enough, and developing the existing database is necessary. The details of the obtained results showed that the hydrodynamic coefficients of the thrust and torque increased by increasing the immersion ratio, but the coefficient of hydrodynamic thrust and efficiency reduced. The results also indicated that the coefficient of torque increased by increasing the shaft inclination angle. The highest efficiency of the propeller was achieved in the range of 40 %–50 % immersion ratios at all angles of shaft inclination. For all immersion ratios, the maximum and minimum efficiencies were obtained at 0 and 15 shaft inclination angles, respectively. The best efficiency of the propeller was at 50 % immersion ratio and zero shaft inclination angle.

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