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Stratification of Swirl Intensity in the Axial Direction for Control of Turbulence Generation During the Compression Stroke
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English
Abstract
Control of turbulence during the compression stroke is suggested by both theoretical calculations and experimental results obtained with an LDV measurement in a motored engine. The authors have found experimentally that when an axial distribution of swirl intensity exists, a large-scale annular vortex is formed inside the cylinder during the compression stroke and this vortex generates and transports turbulence energy. A numerical calculation is adopted to elucidate this phenomenon. Then, an axial stratification of swirl intensity is found to generate a large-scale annular vortex during the compression stroke by an interaction between the piston motion and the axial pressure gradient. The initial swirl profile is parametrically varied to assess its effect on the turbulence parameters. Among calculated results, turbulence energy is enhanced strongest when the swirl intensity is highest at the piston top surface and lowest at the bottom surface of the cylinder head.
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Citation
Moriyoshi, Y., Kamimoto, T., Ohtani, H., and Yagita, M., "Stratification of Swirl Intensity in the Axial Direction for Control of Turbulence Generation During the Compression Stroke," SAE Technical Paper 910261, 1991, https://doi.org/10.4271/910261.Also In
References
- Moriyoshi Y. Ohtani H. Yagita M. Kamimoto T. The Effect of Swirl on the Decay and Generation of In-Cylinder Turbulence during the Compression Stroke Proc. of COMODIA 90 Kyoto 405 1990
- Fraser R.A. Felton P.G. Bracco F.V. Santavicca D.A. Preliminary Turbulence Length Scale Measurements in a Motored IC Engine SAE Paper No. 860021
- Fraser R.A. Bracco F.V. Cycle Resolved LDV Integral Length Scale Measurements in I.C. Engine SAE Paper No. 880381
- Moriyoshi Y. Kobayashi H. Kamimoto T. Experimental Evaluation of the k-ε Turbulence Model in Numerical Simulation of IN-Cylinder Air Motion JSAE Review 10 2 10 1989
- Moriyoshi Y. Kamimoto T. Yagita M. Morita H. Measurement and Numerical Simulation of In-Cylinder Air Motion of a Transparent Engine Trans. Japan Soc. Mech. Eng. 54 502 B 1541 1988