Holographic particle image velocimetry applied to the flow within the cylinder of a four-valve internal combustion engine

Konrath, Robert; Schröder, Wolfgang; Limberg, W.

doi:10.1007/s00348-002-0495-7

Cited by 28 publications

(10 citation statements)

References 14 publications

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“…Nevertheless, due to velocity limitations of the Scanning-PIV technique further investigations using analogue Holographic PIV are currently conducted which will allow the analysis of higher Reynolds number flows. This holographic system has been designed as an Off-Axis stereoscopic setup with complex conjugate reconstruction following the work of Konrath et al [7]. Based on a modular concept, i.e., one module for a parallel projection of the particle field close to the hologram and one reference beam module that also provides the reconstruction beam system, the double images can be recorded on the same hologram simply using two reference beams.…”

Section: Discussionmentioning

confidence: 99%

Time-Resolved Two- and Three-Dimensional Measurements of Transitional Separation Bubbles

Burgmann

Schröder

2009

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Abstract. Advanced methods of the Particle-Image Velocimetry (PIV) technique such as Time-Resolved and Stereo-Scanning PIV have been applied to investigate the separation bubbles on top of a finite circular cylinder and on the suction side of an SD7003 airfoil. A kind of three-dimensional vortex-shedding mechanism associated with the inviscid Kelvin-Helmholtz-instability has been identified to govern the flow field in both cases. The time-averaged velocity distribution is strongly affected by these vortex cascades although the unsteadiness of the bubbles due to the band of frequencies in the spectra of the vortex-shedding mechanism is hidden. Several analyzing methods are used and/or developed and the capabilities of more sophisticated experimental investigations of the three-dimensional flow field associated with separation bubbles are outlined.

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Section: Discussionmentioning

confidence: 99%

Time-Resolved Two- and Three-Dimensional Measurements of Transitional Separation Bubbles

Burgmann

Schröder

2009

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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“…• The challenging task of HPIV measurements within the cylinder of an IC engine is treated in a recent study (Konrath et al 2001). Again, a dual reference beam off-axis configuration is realized with a ruby laser, the illuminating light traverses the cylinder through windows in two directions at 90 • to each other and is collected via mirrors and relay lenses on a single holographic plate.…”

Section: State-of-the-art In Hpivmentioning

confidence: 99%

Holographic particle image velocimetry

Hinsch

2002

Meas. Sci. Technol.

206

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Holography is truly the key to three dimensions in particle image velocimetry, i.e. the measurement of all spatial components of the velocity vector-and this over a deep measuring field. Sophisticated instruments have been designed that successfully tackle practical problems such as the low scattering efficiency of particles, the inferior depth resolution or the aberrations and distortions in the reconstruction. Furthermore, efficient strategies are introduced to interrogate the holographic storage and process the huge amount of data towards a final flow field representation. Recently, phase-sensitive metrology, familiar in many fields of experimental mechanics, has been examined for use in particle velocimetry. Suitable methods are holographic and speckle interferometry or the optical processing of data for three-dimensional correlation. While in these techniques the power of optics is unrivalled, the practical advantage of video and digital techniques over photographic recording is obvious. The electronic version of speckle interferometry (ESPI/DSPI) is a well-established method used in laser metrology and has received further exploitation for applications in flow analysis recently. Finally, the state-of-the-art of digital particle holography is reviewed to allow estimates of its future in experimental flow analysis.

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“…This technique allows a high spatial resolution in medium sized volumes but without temporal resolution. [23][24][25][26] Its main drawbacks are the time-consuming chemical processing of each holographic plate and a complex setup. Furthermore, the measurement accuracy may be declined by optical aberrations and shrinkage of the photosensitive emulsion.…”

Section: Introductionmentioning

confidence: 99%

Investigation of dissipation elements in a fully developed turbulent channel flow by tomographic particle-image velocimetry

et al. 2011

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A new method to describe statistical information from passive scalar fields has been proposed by Wang and Peters ͓"The length-scale distribution function of the distance between extremal points in passive scalar turbulence," J. Fluid Mech. 554, 457 ͑2006͔͒. They used direct numerical simulations ͑DNS͒ of homogeneous shear flow to introduce the innovative concept. This novel method determines the local minimum and maximum points of the fluctuating scalar field via gradient trajectories, starting from every grid point in the direction of the steepest ascending and descending scalar gradients. Relying on gradient trajectories, a dissipation element is defined as the region of all the grid points, the trajectories of which share the same pair of maximum and minimum points. The procedure has also been successfully applied to various DNS fields of homogeneous shear turbulence using the three velocity components and the kinetic energy as scalar fields ͓L. Wang and N. Peters, "Length-scale distribution functions and conditional means for various fields in turbulence," J. Fluid Mech. 608, 113 ͑2008͔͒. In this spirit, dissipation elements are, for the first time, determined from experimental data of a fully developed turbulent channel flow. The dissipation elements are deduced from the gradients of the instantaneous fluctuation of the three velocity components uЈ, vЈ, and wЈ and the instantaneous kinetic energy kЈ, respectively. The measurements are conducted at a Reynolds number of 1.7ϫ 10 4 based on the channel half-height ␦ and the bulk velocity U. The required three-dimensional velocity data are obtained investigating a 17.75ϫ 17.75ϫ 6 mm 3 ͑0.355␦ ϫ 0.355␦ ϫ 0.12␦͒ test volume using tomographic particle-image velocimetry. Detection and analysis of dissipation elements from the experimental velocity data are discussed in detail. The statistical results are compared to the DNS data from Wang and Peters ͓"The length-scale distribution function of the distance between extremal points in passive scalar turbulence," J. Fluid Mech. 554, 457 ͑2006͒; "Length-scale distribution functions and conditional means for various fields in turbulence," J. Fluid Mech. 608, 113 ͑2008͔͒. Similar characteristics have been found especially for the pdf's of the large dissipation element length regarding the exponential decay. In agreement with the DNS results, over 99% of the experimental dissipation elements possess a length that is smaller than three times the average element length.

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Holographic particle image velocimetry applied to the flow within the cylinder of a four-valve internal combustion engine

Cited by 28 publications

References 14 publications

Time-Resolved Two- and Three-Dimensional Measurements of Transitional Separation Bubbles

Time-Resolved Two- and Three-Dimensional Measurements of Transitional Separation Bubbles

Holographic particle image velocimetry

Investigation of dissipation elements in a fully developed turbulent channel flow by tomographic particle-image velocimetry

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