High speed imaging in fundamental and applied combustion research

Sick, Volker

doi:10.1016/j.proci.2012.08.012

Cited by 132 publications

(65 citation statements)

References 156 publications

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“…PLIF provides excellent spatial and temporal resolution (sub-mm and sub-ms, respectively), and recent advances in both lasers and direct imaging detectors enable continuous imaging over many cycles [9]. These capabilities come at the cost of considerable engineering complexity.…”

Section: General Backgroundmentioning

confidence: 99%

Tomographic imaging of the liquid and vapour fuel distributions in a single-cylinder direct-injection gasoline engine

Terzija

Karagiannopoulos

Begg

et al. 2014

International Journal of Engine Research

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Section: General Backgroundmentioning

confidence: 99%

Tomographic imaging of the liquid and vapour fuel distributions in a single-cylinder direct-injection gasoline engine

Terzija

Karagiannopoulos

Begg

et al. 2014

International Journal of Engine Research

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“…The recent development of both diodepumped solid-state (DPSS) lasers and high framing rate CMOS cameras has extended the application of some diagnostic techniques to multi-kHz rate measurements [3,4]. CMOS cameras are now available with large onboard memory, so sustained measurements that record many thousands of frames can cover a wide range of temporal scales This allows rapid accumulation of measurements to capture rare events such as engine misfire [5], and also the post-triggering of a recording sequence to capture the flow behavior preceding transient combustion events such as flame extinction [6].…”

Section: Introductionmentioning

confidence: 99%

“…Planar velocity measurements have been successfully performed at kHz repetition rates in a number of applications using particle image velocimetry (PIV) (see reviews [3,4] and references therein), where micrometer-size particles or droplets are seeded into the flow and their movement is tracked in time to determine the velocity field. However, for temperature, a variable of critical interest in flows involving heat transfer or chemical reactions, to date there are only two demonstrations of planar measurements at sustained kHz repetition rates [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…This technique was first applied in a heated nitrogen jet [7] and later, in combination with PIV, to investigate the evolution of temperature stratification in a motored internal combustion engine fed with nitrogen [8]. However, strong oxygen quenching prohibited measurements in air and the toluene emission around 300 nm required the use of high-speed intensifiers, which are associated with non-linearities and charge depletion effects [4,9].…”

Section: Introductionmentioning

confidence: 99%

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High-speed planar thermometry and velocimetry using thermographic phosphor particles

et al. 2013

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Simultaneous gas-phase temperature and velocity imaging using micrometer-size thermographic phosphor particles seeded into the flow is demonstrated at a 3 kHz repetition rate. The velocity field is measured using a standard particle image velocimetry approach, while the temperature is determined from the temperature sensitive phosphorescence emission of the particles following excitation at 355 nm. Since the particles are very small, they rapidly assume the temperature and velocity of the surrounding gas. A single shot temperature precision of better than 5 % was achieved at 500 K. Time-resolved measurements in the wake of a heated cylinder are presented, demonstrating the utility of these imaging diagnostics to observe transient, coupled heat and mass transfer phenomena.

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“…Since the time delay between the two laser pulses is used to ensure the best correlations within the light sheet plane, the thickness of the sheet is a variable in this context. While the uniformity of the light intensity is not as critical as it is for intensity-based measurements such as planar laser-induced fluorescence imaging 3 , a near top-hat beam profile helps PIV quality, especially for higher resolution imaging.…”

Section: Introductionmentioning

confidence: 99%

High-speed Particle Image Velocimetry Near Surfaces

Sick

2013

JoVE

Self Cite

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Multi-dimensional and transient flows play a key role in many areas of science, engineering, and health sciences but are often not well understood. The complex nature of these flows may be studied using particle image velocimetry (PIV), a laser-based imaging technique for optically accessible flows. Though many forms of PIV exist that extend the technique beyond the original planar two-component velocity measurement capabilities, the basic PIV system consists of a light source (laser), a camera, tracer particles, and analysis algorithms. The imaging and recording parameters, the light source, and the algorithms are adjusted to optimize the recording for the flow of interest and obtain valid velocity data.Common PIV investigations measure two-component velocities in a plane at a few frames per second. However, recent developments in instrumentation have facilitated high-frame rate (> 1 kHz) measurements capable of resolving transient flows with high temporal resolution. Therefore, high-frame rate measurements have enabled investigations on the evolution of the structure and dynamics of highly transient flows. These investigations play a critical role in understanding the fundamental physics of complex flows.A detailed description for performing high-resolution, high-speed planar PIV to study a transient flow near the surface of a flat plate is presented here. Details for adjusting the parameter constraints such as image and recording properties, the laser sheet properties, and processing algorithms to adapt PIV for any flow of interest are included.

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High speed imaging in fundamental and applied combustion research

Cited by 132 publications

References 156 publications

Tomographic imaging of the liquid and vapour fuel distributions in a single-cylinder direct-injection gasoline engine

Tomographic imaging of the liquid and vapour fuel distributions in a single-cylinder direct-injection gasoline engine

High-speed planar thermometry and velocimetry using thermographic phosphor particles

High-speed Particle Image Velocimetry Near Surfaces

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