Laser doppler anemometry in hydrodynamic testing

Puharić, Mirjana; Ristić, Slаvicа; Kutin, Marina; Adamović, Živoslav

doi:10.1007/s10946-007-0047-y

Cited by 9 publications

(7 citation statements)

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“…Laser Doppler Anemometry (LDA) is optical technique for investigation of velocity and turbulence in gas, liquid, and mixing fluids, flame, rotating machinery, in combustion, channels, chemically reacting flows, wave tanks wind or water tunnels, in biomedical applications, atmospheres, oceanography and in various spectrum of scientific and industrial research. LDA is power fool method for indirect flow visualization, too [11,14,15]. The basic idea underlying LDA is to measure the velocity of tiny particles transported by the flow.…”

Section: Visualization By Different Small Particlesmentioning

confidence: 99%

“…The quantity measured by the LDA is the projection of the velocity vector on the measuring direction defined by the optical system, high spatial and temporal resolution, multi -component and multi -directional measurements and so on.a b Some details of experimental setup, a) water tunnel and 1D LDA, b) hydrofoil in WCT test section and laser beams[11] a b Fi. 6: LDA, experimental (a) and numerical (b) results of visualization by vector velocity distribution for flow around hydrofoil positioned at α = 25°, V∞=5.32 m/s, (flow is left to right)[14]…”

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confidence: 99%

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A - a view in the invisible

Ristić¹

2013

Theor appl mech (Belgr)

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Flow visualization is an important topic in, experimental and computational fluid dynamics and has been the subject of research for many years. This paper presents an overview of flow visualization techniques. The physical basis and applications of different visualization methods for subsonic, transonic and supersonic flow in wind and water tunnels are described: direct injection methods, (smoke, dye, fog and different small particles), gas and hydrogen bubbles, , flow visualization by tufts, oil, liquid crystals, pressure and temperature sensitive paints, shadow, schlieren, interferometry, Laser Doppler Anemometry, Particle Image Velocimetry and other special techniques. Almost all presented photos have been recorded during tests in laboratories of MTI Belgrade.

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Section: Visualization By Different Small Particlesmentioning

confidence: 99%

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confidence: 99%

A - a view in the invisible

Ristić¹

2013

Theor appl mech (Belgr)

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“…Laser-Doppler anemometry (LDA) is an optical technique for measurement of velocity and turbulence in gas, liquid, multiphase fluids, chemically reacting flows, in combustion, flame, wave tanks, rotating machinery, wind or water tunnels, micro and macro channels, in biomedical applications, atmospheres, oceanography and in other scientific, and industrial research, where the conventional techniques can not be performed successfully [1][2][3][4][5][6][7][8][9][10][11]. This optical method of local instantaneous velocity measurement is non-contact, non-intrusive and can be employed where the physical sensors are difficult or impossible to use.…”

Section: Introductionmentioning

confidence: 99%

Estimation of laser-Doppler anemometry measuring volume displacement in cylindrical pipe flow

Ristić¹,

Ilić

Čantrak

et al. 2012

THERM SCI

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Laser-Doppler anemometry application in measurements of the 3-D swirl turbulent flow velocity in the cylindrical pipe, behind the axial fan, have been analysed. This paper presents a brief overview of uncertainty sources in the laser-Doppler anemometry measurements. Special attention is paid to estimation of laser-Doppler anemometry measuring volume positioning in cylindrical pipe flow due to optical aberrations, caused by the pipe wall curvature. The hypothesis, that in the central part of the pipe (r/R < 0.6) exists a small, or negligible pipe wall influence on laser- -Doppler anemometry measuring position, is investigate. The required corrections, for measurements of axial, tangential, and radial velocity components such: shift of measuring volume and its orientation are analyzed and determined for used test rig and for some other pipe geometries. [Projekat Ministarstva nauke Republike Srbije, br. TR 35046

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“…The authors specify the significance and the role of the maintenance according to the condition, while in documents [1], [2], [4] to [6], this kind of maintenance is defined as a form of preventive maintenance whose strategy of decision making on maintenance activities is based on periodic and constant technical control of the system in the exploitation process, and according to the results of the diagnostics control the decisions are made on the necessary deadline and the amount of planned maintenance activities.…”

Section: Introductionmentioning

confidence: 99%

“…This is a model for calculating the cost of lost production during maintenance actions in Eq. 6: (6) where C LP is the cost of lost production, N WP the number of days without production, and RC the replacement cost.…”

Section: Spare Parts Saving By Introducing the Maintenance Programmementioning

confidence: 99%

An Evaluation of Formed Maintenance Programme Efficacy

Đurić

Josimović²,

Adamović

et al. 2012

SV-JME

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This paper presents the basic ideas for programming the maintenance of complex technical systems, which is a set of rules for determining the diagnostic mode of the constituent parts of the system in the actual exploitation process and decision making regarding the need for their replacement or on the extent of the necessary maintenance based on the information of the actual technical condition of the system. Assuming that the condition based maintenance is, in fact, the management system of the technical state of the system in the exploitation process, upon choosing the strategy for the condition based maintenance we have performed an analysis of the applicability of formed variants of the maintenance programme and evaluated their efficiency by comparing them with basic indicators (for corrective and preventive maintenance). We have pointed out the importance of using the described maintenance programme to increase reliability level and decrease the stagnation of technical systems, which results in high efficiency, and thus increases the productivity of companies where the systems have been installed.

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Laser doppler anemometry in hydrodynamic testing

Cited by 9 publications

References 1 publication

A - a view in the invisible

A - a view in the invisible

Estimation of laser-Doppler anemometry measuring volume displacement in cylindrical pipe flow

An Evaluation of Formed Maintenance Programme Efficacy

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