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- W2091708813 abstract "Tumble flow has been adopted to increase the precombustion turbulence level in four-valve engines, since it can be effectively generated with negligible adverse effect on the flow coefficient. In this study, turbulence characteristics of the tumble flow in a four-valve engine were investigated by laser Doppler velocimetry (LDV) and analyzed by means of turbulence intensity, integral time and length scales, and energy spectrum. The data rate was sufficiently high to allow the bulk velocity to be characterized in individual cycles at 500 and 1000 rpm for two different intake ports. The integral time scales obtained by three kinds of different definitions and their characteristics were compared. The results show that tumble causes turbulence intensity to increase considerably during the compression stroke and its distribution to be homogeneous. The effect of tumble on integral time scale is negligible, while the integral length scale increases by tumble." @default.
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- W2091708813 date "1998-11-01" @default.
- W2091708813 modified "2023-10-16" @default.
- W2091708813 title "Turbulence characteristics of tumble flow in a four-valve engine" @default.
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- W2091708813 doi "https://doi.org/10.1016/s0894-1777(98)10023-7" @default.
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