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Open AccessArticle

The Study of Turbulent Fluctuation Characteristics in a Small Rotary Engine with a Peripheral Port Based on the Improved Delayed Detached Eddy Simulation Shear-Stress Transport (IDDES-SST) Method

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
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Energies 2018, 11(3), 642; https://doi.org/10.3390/en11030642
Received: 8 February 2018 / Revised: 2 March 2018 / Accepted: 2 March 2018 / Published: 14 March 2018
In this paper, an improved delayed detached eddy simulation method combined with shear-stress transport (SST) model was used to study the three-dimensional turbulent characteristics in a small rotary engine with a peripheral port. The turbulent characteristics including instantaneous velocity, turbulent fluctuation, coherent structure and velocity circulation were analysed based on a dynamic model of the small rotary engine. Three sets of conclusions on the basis of computational results were obtained. First, it was found that large-scale vortex structures with high intensity were distributed in the center of the chamber in the intake process and broke into lots of small vortex structures in the compression process. Second, flow stability in the X direction decreased from the leading to the trailing in the small rotary engine. The fluctuation velocity of the Y direction showed the paraboloid feature and its peak position moved from the mid-back to the middle of the chamber during the operation process. Third, during the intake process, two vortices occurred in the cross section parallel to the covers and were located at the leading and trailing of the cross section, respectively. Compared to the intake process, more vortices occur at cross sections which were far away from the central section during the compression process. View Full-Text
Keywords: small rotary engine; coherent structure; velocity circulation; turbulent fluctuation small rotary engine; coherent structure; velocity circulation; turbulent fluctuation
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Zhang, Y.; Liu, J.; Zuo, Z. The Study of Turbulent Fluctuation Characteristics in a Small Rotary Engine with a Peripheral Port Based on the Improved Delayed Detached Eddy Simulation Shear-Stress Transport (IDDES-SST) Method. Energies 2018, 11, 642.

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