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A Combined Numerical and Experimental Study of the 3D Tumble Structure and Piston Boundary Layer Development During the Intake Stroke of a Gasoline Engine

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Abstract

Due to its positive effect on flame propagation in the case of a well-defined breakdown, the formation of a large-scale tumble motion is an important goal in engine development. Cycle-to-cycle variations (CCV) in the tumble position and strength however lead to a fluctuating tumble breakdown in space and time and therefore to combustion variations, indicated by CCV of the peak pressure. This work aims at a detailed investigation of the large-scale tumble motion and its interaction with the piston boundary layer during the intake stroke in a state-of-the-art gasoline engine. To allow the validation of the flow near the piston surface obtained by simulation, a new measurement technique called “Flying PIV” is applied. A detailed comparison between experimental and simulation results is carried out as well as an analysis of the obtained flow field. The large-scale tumble motion is investigated based on numerical data of multiple highly resolved intake strokes obtained using scale-resolving simulations. A method to detect the tumble center position within a 3D flow field, as an extension of previously developed 2D and 3D algorithms, is presented and applied. It is then used to investigate the phase-averaged tumble structure, its characteristics in terms of angular velocity and the CCV between the individual intake strokes. Finally, an analysis is presented of the piston boundary layer and how it is influenced by the tumble motion during the final phase of the intake stroke.

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Acknowledgments

For the numerical part, the authors kindly acknowledge the financial support from the FVV (Forschungsvereinigung Verbrennungskraftmaschinen) within the project ”BSZII” (project number 6011333). The authors also thank Dr. Wolfgang Bauer and Dr. Florian Menter (both ANSYS Germany) for the fruitful discussions. The simulations were performed on the national supercomputer Cray XC40 (Hornet) at the High Performance Computing Center Stuttgart (HLRS) under the grant number ICECCV/44054 based on licences sponsored by ANSYS Germany. The experimental part was funded by the DFG (Deutsche Forschungsgesellschaft) within the program BR 1494/20-1 and the support is gratefully acknowledged here. Professor Christoph Bruecker is currently BAE SYSTEMS Sir Richard Olver Chair in Aeronautical Engineering, City University London, whose support is gratefully acknowledged.

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Authors and Affiliations

  1. Numerical Thermo-Fluid Dynamics, TU Bergakademie Freiberg, Fuchsmühlenweg 9, 09599, Freiberg, Germany

    S. Buhl, F. Gleiss, F. Hartmann, D. Messig & C. Hasse

  2. Institute of Mechanics and Fluid Dynamics, TU Bergakademie Freiberg, Lampadiusstraße 4, 09599, Freiberg, Germany

    M. Köhler

  3. Sir Richard Olver Chair in Aeronautical Engineering, City University London, Northampton Square, London, EC1V 0HB, UK

    C. Brücker

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  1. S. Buhl
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Correspondence to S. Buhl.

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Buhl, S., Gleiss, F., Köhler, M. et al. A Combined Numerical and Experimental Study of the 3D Tumble Structure and Piston Boundary Layer Development During the Intake Stroke of a Gasoline Engine. Flow Turbulence Combust 98, 579–600 (2017). https://doi.org/10.1007/s10494-016-9754-1

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