Measurement of rotating flows using PIV and image derotation

Stickland, Matthew; Scanlon, Thomas; Waddell, Peter; Francos, Joaquín Fernández; Blanco, Eduardo

doi:10.1007/s00348-002-0563-z

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Assessments of the uncertainty associated with the determination of the peripheral velocity and of the overall accuracy of the postprocessing procedure might also have been useful, but they are not provided in the works mentioned above. The only attempts at a direct measurement of the relative velocity field inside radial flow impellers can be found in [9][10][11]. In the first two cases [9,10], the authors performed PIV investigations with a CCD camera rotating with the test section, while Stickland et al [11] used a fixed camera combined with an image derotator consisting of a mirror system rotating at half the speed of the test section.…”

Section: Introductionmentioning

confidence: 99%

“…The only attempts at a direct measurement of the relative velocity field inside radial flow impellers can be found in [9][10][11]. In the first two cases [9,10], the authors performed PIV investigations with a CCD camera rotating with the test section, while Stickland et al [11] used a fixed camera combined with an image derotator consisting of a mirror system rotating at half the speed of the test section.…”

Section: Introductionmentioning

confidence: 99%

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Flow field investigations in rotating facilities by means of stationary PIV systems

Armellini¹,

Mucignat²,

Casarsa³

et al. 2011

Meas. Sci. Technol.

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The flow field inside rotating test sections can be investigated by means of particle image velocimetry (PIV) operated in the phase-locked mode. With this experimental approach, the measurement system is kept fixed and it is synchronized with the periodical passage of the test section. Therefore, the direct output of the PIV measurements is the absolute velocity field, while the relative one is indirectly obtained from proper data processing that relies on accurate knowledge of the peripheral velocity field. This work provides an uncertainty analysis about the evaluation of the peripheral displacement field in phase-locked PIV measurements. The analysis leads to the detection of the levels of accuracy required in the estimation of both the angular velocity and the position of the center of rotation to ensure correct evaluation of the peripheral displacement field. In this regard, a simple methodology is proposed to evaluate the center of rotation position with an accuracy below 1 px. Finally, a procedure to pre-process the PIV images by subtracting the peripheral displacement is described. The advantages of its implementation are highlighted by the comparison with the performance of a more standard methodology where the peripheral field is subtracted from the absolute velocity field and not directly from the PIV raw data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow field investigations in rotating facilities by means of stationary PIV systems

Armellini¹,

Mucignat²,

Casarsa³

et al. 2011

Meas. Sci. Technol.

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“…The major problems arise when working with higher pressures because it requires the use of materials that withstand them. In these cases, one can reach a certain compromise by using materials which do not distort the flow images, as also done with standard-size pumps [17], or engines at low speeds [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Flow in a Micropump Model

Pastor

Marcos

Montanero

et al. 2012

Volume 1: Symposia, Parts a and B

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This work presents an experimental and numerical study of a nozzle/diffuser micropump working in the steady regime. Experiments were conducted with a model ten times bigger than the prototype. Preliminary results on the velocity distribution in the chamber were obtained with the PIV technique. The velocity distribution inside the chamber was calculated numerically and the predictions were compared with the experimental measurements showing a satisfactory agreement in the center and extremes, but not in the middle of them.

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“…Choi et al [5] studied the velocity vector fields of centrifugal impeller by PIV technique. Stickland et al [6] utilized PIV to visualize and quantitatively examine the flow patterns between the blades of a centrifugal impeller.…”

Section: Introductionmentioning

confidence: 99%

Particle image velocimetry investigation of the flow field in a centrifugal impeller with unequally spaced blades

Ouyang

Tian

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part A:

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The characteristics of flow in a centrifugal impeller with different stagger angle along the blade span and unequally spaced blades were investigated using particle image velocimetry (PIV). Instantaneous and averaged velocity measurements were carried out at the inlet, outlet, inside blade passage, around blade, and around scroll of the centrifugal impeller by synchronizing the passage of the blade with laser and camera system. These measurements revealed detailed flow features at the operating point of the centrifugal impeller with and without scroll. The data from the PIV measurements were used to analyse the performance of the centrifugal impeller.

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Measurement of rotating flows using PIV and image derotation

Cited by 5 publications

References 2 publications

Flow field investigations in rotating facilities by means of stationary PIV systems

Flow field investigations in rotating facilities by means of stationary PIV systems

Experimental and Numerical Investigation of the Flow in a Micropump Model

Particle image velocimetry investigation of the flow field in a centrifugal impeller with unequally spaced blades

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