Evaluation of Signal Processing Techniques in Laser Anemometry

Modarress, D.; Nakayama, A.

doi:10.1007/978-3-642-83844-6_22

Cited by 10 publications

(5 citation statements)

References 1 publication

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“…Each bin represented a particular angular position among a total of 360. A comprehensive review of errors in laser Doppler velocimetry measurements and guidelines to evaluate them can be found in [38][39][40][41]. The statistical uncertainty in mean and rms velocities depends on the number of sampled data, turbulence intensity, and confidence level.…”

Section: Experimental Methodologymentioning

confidence: 99%

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Villa

Gaggero

Tani

et al. 2020

JMSE

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Ducted propellers are unconventional systems that are usually adopted for ship propulsion. These devices have recently been studied with medium-fidelity computational fluid dynamics code (based on the potential flow hypothesis) with promising results. However, these tools, even though they provide a good prediction of the forces and moments generated by the blades and the duct, are not able to provide insight into the flow field characteristics due to their crude flow approximations. On the contrary, modern high-fidelity viscous-based computational fluid dynamics codes could give a better description of the near and far-field flow of these particular devices. In the present paper, forces and the most significant features of the flow field around two ducted propellers are analyzed by means of both experimental and computational fluid dynamics approaches. In particular, accelerating and decelerating ducts are considered, and we demonstrate the ability of the adopted solver to accurately predict the performance and the flow field for both types. These results, in particular for the less-studied decelerating duct, designate CFD as a useful tool for reliable designs.

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Section: Experimental Methodologymentioning

confidence: 99%

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Villa

Gaggero

Tani

et al. 2020

JMSE

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“…A comprehensive review of errors in laser-Doppler velocimetry measurements and guidelines to evaluate them is given in Min [8], Lakshminarayana [9], Boutier [10], Strazisar [11] and Modarress et al [12]. Statistical uncertainty in mean and rms velocities depends on the number of sampled data, turbulence intensity, and confidence level.…”

Section: Methodsmentioning

confidence: 99%

EFD and CFD Characterization of a CLT Propeller

Bertetta

Brizzolara

Canepa

et al. 2012

International Journal of Rotating Machinery

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In the present paper an experimental and numerical analysis of an unconventional CLT propeller is carried out. Two different numerical approaches, a potential panel method and an RANSE solver, are employed. Cavitation tunnel experiments are carried out in order to measure, as usual, thrust, torque, and cavity extension for different propeller working points. Moreover, LDV measurements are performed to have a deep insight into the complex wake behind the propeller and to analyze the dynamics of generated tip vortexes. The numerical/experimental analysis and comparison of results highlight the peculiarities of this kind of propellers, the possibility to increase efficiency and reduce cavitation risk, in order to exploit the design approaches already well proven for conventional propellers also in the case of these unconventional geometries.

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“…A specific evaluation of errors for LDV frequency domain processors is given by Modarress et al [14].…”

Section: Ldv Experimental Uncertaintymentioning

confidence: 99%

Velocity and turbulence measurements in a separating boundary layer with and without passive flow control

Satta¹,

Simoni²,

Ubaldi³

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part A:

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The present paper reports the results of a detailed experimental study on low profile vortex generators (VGs) used to control boundary layer separation on a large-scale flat plate with prescribed adverse pressure gradients. This activity is part of a joint European research program on Aggressive Intermediate Duct Aerodynamics. The inlet turbulent boundary layer and the pressure gradient over the flat plate are representative of aggressive turbine intermediate ducts. By regulating the inclination of the wall opposite to the flat plate, different pressure gradients, typical of turbine intermediate ducts, can be obtained. To avoid separation on the movable wall, boundary layer suction is applied. Previous measurements showed the effectiveness of VGs in delaying separation and revealed their optimum configuration for the different prescribed pressure gradients. In the present work, laser Doppler velocimetry (LDV) is applied to the most significant pressure gradient case, in order to obtain a more thorough knowledge of the near-wall flow field. Velocity and turbulence profiles are determined up to the near-wall region in order to provide an in-depth analysis of turbulent boundary layer at separation conditions, with and without application of control devices. LDV allowed high spatial resolution and accurate statistical analysis of the boundary layer velocities. The results show velocity and turbulence profiles typical of separated turbulent boundary layers for the baseline case, and non-conventional unseparated boundary layer profiles when VGs are installed on the flat plate

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Evaluation of Signal Processing Techniques in Laser Anemometry

Cited by 10 publications

References 1 publication

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

Numerical and Experimental Comparison of Ducted and Non-Ducted Propellers

EFD and CFD Characterization of a CLT Propeller

Velocity and turbulence measurements in a separating boundary layer with and without passive flow control

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