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Flow field measurements in an optically accessible, direct-injection spray-guided internal combustion engine using high-speed PIV

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Abstract

High-speed particle image velocimetry has been applied to study the flow field of an optically accessible motored direct-injection spray-guided internal combustion engine. Based on recent improvements in all-solid-state diode-pumped laser- and CMOS camera-technology a large field of view (43 × 44 mm2) was achieved at 6 kHz resulting in a temporal resolution of 1° crank angle at 1,000 rpm. This allows the investigation of the temporal evolution of large-scale flow structures. The flow field was recorded during the latter half of the compression stroke for tumble flow conditions at 500, 1,000 and 2,000 rpm. An analysis of cycle-to-cycle variations has been performed from individual and ensemble-averaged cycles. The temporal evolution of the main vortex center and the kinetic energy shows a few individual cycles with strong variations from the mean caused by a substantially different flow regime. A quantification of cyclic variations using the kinetic energy is possible.

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Acknowledgments

The authors are grateful for the financial support of the Deutsche Forschungsgemeinschaft (DFG) through the project SFB 568 T4 and the Center of Smart Interfaces (CSI) through project EXC 259.

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Correspondence to A. Dreizler.

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Müller, S.H.R., Böhm, B., Gleißner, M. et al. Flow field measurements in an optically accessible, direct-injection spray-guided internal combustion engine using high-speed PIV. Exp Fluids 48, 281–290 (2010). https://doi.org/10.1007/s00348-009-0742-2

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  • DOI: https://doi.org/10.1007/s00348-009-0742-2

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