Development of LDV(Laser Doppler Velocimetry) for Measuring Three Dimensional Hull Wake of Ship Model in Large Cavitation Tunnel

2017 ◽  
Vol 54 (6) ◽  
pp. 515-521 ◽  
Author(s):  
Bu-Geun Paik ◽  
Jong-Woo Ahn ◽  
Han-Shin Seol ◽  
Young-Ha Park ◽  
Ki-Sup Kim ◽  
...  
Keyword(s):  
Laser Doppler Velocimetry ◽  
Three Dimensional ◽  
Laser Doppler ◽  
Doppler Velocimetry ◽  
Ship Model ◽  
Cavitation Tunnel

Evaluation of a Dynamic Positioning Thruster Wake Using Laser Doppler Velocimetry

2004 ◽  
Author(s):  
Said El-Lababidy ◽  
Neil Bose ◽  
Pengfei Liu
Keyword(s):  
Laser Doppler Velocimetry ◽  
Diameter Ratio ◽  
Operating Conditions ◽  
Laser Doppler ◽  
Hydrodynamic Characteristics ◽  
Dynamic Positioning ◽  
Doppler Velocimetry ◽  
Near Wake ◽  
Ducted Propeller ◽  
Cavitation Tunnel

To provide information on the wake characteristics of Dynamic Positioning (DP) thrusters when operating with and without a nozzle under varied operating conditions, experiments were done on a ducted propeller model in a cavitation tunnel. The propeller flow field was measured with a two-component Laser Doppler Velocimetry (LDV) system, up to 1.5 diameters downstream. These experiments were carried out with and without the nozzle, and the results are presented here for a pitch/diameter ratio of 1.2 and an advance coefficient of 0.4. This paper shows and compares the results of the DP thruster near wake hydrodynamic characteristics obtained by the LDV system when operating with and without a nozzle.

Aspects of Design and Manufacture of a Three-Dimensional Fibre Optic Laser Doppler Probe Head

2013 ◽  
Vol 397-400 ◽  
pp. 103-113 ◽  
Author(s):  
Noor A. Ahmed
Keyword(s):  
Flow Field ◽  
Laser Doppler Velocimetry ◽  
Three Dimensional ◽  
Laser Doppler ◽  
Doppler Velocimetry ◽  
Fibre Optic ◽  
Complex Flow ◽  
Doppler Probe ◽  
Dimensional Measurements ◽  
Probe Head

Laser Doppler Velocimetry is an important flow diagnostic methodology used in modern day fluid flow investigations. The present paper describes the design and manufacturing aspects of a novel fibre optic LASER Doppler probe head intended for three dimensional measurements in a complex flow field. The paper particularly concentrates on the tight tolerances required of the various components associated with the probe head to achieve the desired measurement volume. Keywords: Fibre Optic, Laser Doppler, Velocimetry, three-dimensional, complex flow field

scholarly journals Investigation of Internal Flow in Centrifugal Pump Diffuser using Laser Doppler Velocimetry (LDV) and Computational Fluid Dynamics

2021 ◽  
Vol 1909 (1) ◽  
pp. 012075
Author(s):  
Daisuke Sugiyama ◽  
Asuma Ichinose ◽  
Tomoki Takeda ◽  
Kazuyoshi Miyagawa ◽  
Hideyo Negishi ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Centrifugal Pump ◽  
Laser Doppler Velocimetry ◽  
Internal Flow ◽  
Laser Doppler ◽  
Doppler Velocimetry

scholarly journals Laser-Doppler Velocimetry Measurements Inside a Backward Curved Centrifugal Fan

2001 ◽  
Vol 7 (3) ◽  
pp. 173-181
Author(s):  
Tong-Miin Liou ◽  
Meng-Yu Chen
Keyword(s):  
Flow Rate ◽  
Turbulence Intensity ◽  
Laser Doppler Velocimetry ◽  
Reverse Flow ◽  
Flow Region ◽  
Design Flow ◽  
Laser Doppler ◽  
Centrifugal Fan ◽  
Doppler Velocimetry ◽  
Flow Rates

Laser-Doppler velocimetry (LDV) measurements are presented of relative mean velocity and turbulence intensity components inside the impeller passage of a centrifugal fan with twelve backward curved blades at design, under-design, and over-design flow rates. Additional LDV measurements were also performed at the volute outlet to examine the uniformity of the outlet flow for the three selected flow rates. Complementary flow visualization results in the tongue region are further presented. It is found that the number of characteristic flow regions and the average turbulence level increase with decreasing air flow rate. For the case of under-design flow rate, there are a through-flow region on the suction side, a reverse flow region on the pressure side, and a shear layer region in between. The corresponding average turbulence intensity is as high as 9.1% of blade tip velocity.

scholarly journals Imaging laser Doppler velocimetry

2011 ◽  
Vol 52 (4) ◽  
pp. 1017-1026 ◽  
Author(s):  
Alexander H. Meier ◽  
Thomas Roesgen
Keyword(s):  
Laser Doppler Velocimetry ◽  
Laser Doppler ◽  
Doppler Velocimetry
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