Two-Phase PIV: Fuel-Spray Interaction with Surrounding Air

Dankers, Stefan; Gotthardt, Mark; Stengler, Thomas; Ohmstede, Gerhard; Hentschel, W.

doi:10.1007/978-3-540-73528-1_17

Cited by 6 publications

(10 citation statements)

References 4 publications

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“…Whilst previous work has produced full-field 2-component (2C) velocity information, the experimental setups used are complex requiring multiple cameras (Rottenkolber et al 2002;Boedec and Simoens 2001;Driscoll et al 2003;Lee and Nishida 2003;Towers et al 1999); the use of a single camera has also been reported, but the measurements in both phases were not obtained simultaneously (Dankers et al 2008). Even though measurements in both phases have been obtained, the approaches relied on a difference in phase velocity for successful separation (Rottenkolber et al 2002) (Driscoll et al 2003) or were aided by a difference in size of the tracers in each phase (Lee and Nishida 2003); this indicates the need for a priori information for phase separation.…”

Section: Introductionmentioning

confidence: 98%

Three-component multi-phase velocimetry measurements on a GDI spray using optically efficient fluorescent tracers

Angarita-Jaimes

Towers

2011

Exp Fluids

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Two-and three-component multi-phase air/fuel measurements have been performed on a GDI injector. UV-excitable fluorescent tracers have been used to seed the gas phase, and the naturally occurring droplets in the fuel are the other phase. A high-pressure multi-hole GDI injector was mounted in a rig with a glass barrel to simulate the engine cylinder and provide optical access. Images were obtained under controlled conditions of fuel pressure and injection duration. Flow phase and pulse order have been determined from a single 3CCD colour camera. Suitable corrective processes have been adapted and implemented to account for crosstalk and chromatic aberrations so that the uncertainty of the velocity vectors produced is comparable to that of conventional PIV using 532 nm illumination. Multi-phase air/fuel vector maps have been produced. A second colour camera has been added to obtain stereo velocity measurements providing previously unavailable simultaneous information on the multi-phase (fuel/air) interaction with three velocity components.

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Section: Introductionmentioning

confidence: 98%

Three-component multi-phase velocimetry measurements on a GDI spray using optically efficient fluorescent tracers

Angarita-Jaimes

Towers

2011

Exp Fluids

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“…The internal ambient air can be heated up to 400 °. [4]. The presence of the penetration wave and recirculating structure at two different instants is observed.…”

Section: Literature Reviewmentioning

confidence: 87%

“…[8] The combustion efficiency, as well as the pollutant emission levels, depends on the quality of the air-fuel mixture. In the case of these types of engines, the mixture is influenced mainly by the spray characteristics and its interaction with the ambient gas [9] [3] [4]. Turbulent structures formed in the shear layers and jet boundaries intensify contact between air and fuel droplets, allowing the interaction to occur at microscopic levels [2].…”

Section: Literature Reviewmentioning

confidence: 99%

“…with the propagation of the penetration wave across the spray length. For Moon et al [12], the propagation velocity of this instability depends mainly on the fuel In Dankers et al [4], an injector for direct gasoline injection is also studied in a high-pressure chamber. Unlike the other works, this chamber has a continuous low magnitude axial flow that has the function of scavenging the injection residues from chamber.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The presence of both phases in the image makes it hinder to apply the standard statistical correlation algorithms. Extracted from[4].To overcome the problem of phase separation, some separation methods wereproposed. The first method is the spray differentiation by the intensity value of the pixels recorded in the image.…”

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confidence: 99%

See 2 more Smart Citations

Interaction of turbulent structures with ethanol sprays in mixture formation processes in a constant-flow chamber.

Berti¹

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Simultaneous two-phase flow measurement of spray mixing process by means of high-speed two-color PIV

Zhang

Hung

2014

Meas. Sci. Technol.

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In this article, a novel high-speed two-color PIV optical diagnostic technique has been developed and applied to simultaneously measure the velocity flow-fields of a multi-hole spark-ignition direct injection (SIDI) fuel injector spray and its ambient gas in a high-pressure constant volume chamber. To allow for the phase discrimination between the fuel droplets and ambient gas, a special tracer-filter system was designed. Fluorescent seeding particles with Sauter mean diameter (SMD) of 4.8 µm were used to trace the gas inside the chamber. With a single high-speed Nd:YLF laser sheet (527 nm) as the incident light source, the Mie-scattering signal marked the phase of the fuel spray, while the fluorescent signal generated from the seeding particles tracked the phase of ambient gas. A high-speed camera, with an image-doubler (mounted in front of the camera lens) that divided the camera pixels into two parts focusing on the same field of view, was used to collect the Mie-scattering signal and LIF (laser induced fluorescence) signal simultaneously with two carefully selected optical filters. To accommodate the large dynamic range of velocities in the two phases (1–2 orders of magnitude difference), two separation times (dt) were introduced. This technique was successfully applied to the liquid spray and ambient gas two-phase flow measurement. The measurement accuracy was compared with those from LDV (laser Doppler velocimetry) measurement and good agreement was obtained. Ambient gas motion surrounding the fuel spray was investigated and characterized into three zones. The momentum transfer process between the fuel spray and ambient gas in each zone was analyzed. The two-phase flow interaction under various superheated conditions was investigated. A strengthened momentum transfer from the liquid spray to the ambient was observed with increased superheat degree.

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Two-Phase PIV: Fuel-Spray Interaction with Surrounding Air

Cited by 6 publications

References 4 publications

Three-component multi-phase velocimetry measurements on a GDI spray using optically efficient fluorescent tracers

Three-component multi-phase velocimetry measurements on a GDI spray using optically efficient fluorescent tracers

Interaction of turbulent structures with ethanol sprays in mixture formation processes in a constant-flow chamber.

Simultaneous two-phase flow measurement of spray mixing process by means of high-speed two-color PIV

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