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Turbulence and Cycle-by-Cycle Variation of Mean Velocity Generated by Swirl and Tumble Flow and Their Effects on Combustion
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English
Abstract
Combinations of swirl flow and tumble flow generated by 13 types of swirl control valve were tested by using both impulse steady flow rig and LDV. Comparison between the steady flow characteristics and the result of LDV measurement under motoring condition shows that tumble flow generates turbulence in combustion chamber more effectively than swirl flow does, and that swirling motion reduces the cycle by cycle variation of mean velocity in combustion chamber which tends to be generated by tumbling motion.
Performance tests are also carried out under the condition of homogeneous charge. Tumble flow promotes the combustion speed more strongly than expected from its turbulence intensity measured by LDV. It is also shown that lean limit air fuel ratio does not have a strong relation with cycle variation of mean velocity but with turbulence intensity.
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Citation
Urushihara, T., Murayama, T., Takagi, Y., and Lee, K., "Turbulence and Cycle-by-Cycle Variation of Mean Velocity Generated by Swirl and Tumble Flow and Their Effects on Combustion," SAE Technical Paper 950813, 1995, https://doi.org/10.4271/950813.Also In
Applications and Developments in New Engine Design and Components
Number: SP-1071; Published: 1995-02-01
Number: SP-1071; Published: 1995-02-01
References
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- Lee K. Urushiliara T. et al. “Analysis of Gas Flow Fields Generated by Butterfly Type Swirl Control Valve” Transactions of JSAE 9304365 24 3 22 1993
- Liou T.M. Hall M. et al. “Laser Doppler Velocimetry Measurements in Valved and Ported Engines” S.A.E. Transactions No.84375
- Liou T.M. Santavicca D.A. “Cycle Resolved Turbulence Measurements in a Ported Engine With and Without Swirl” S.A.E. Transactions No. 830419