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Effect of Supercharging on the Intake Flow Characteristics of a Swirl-Supported Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Although supercharged system has been widely employed in downsized engines, the effect of supercharging on the intake flow characteristics remains inadequately understood. Therefore, it is worthwhile to investigate intake flow characteristics under high intake pressure. In this study, the supercharged intake flow is studied by experiment using steady flow test bench with supercharged system and transient flow simulation. For the steady flow condition, gas compressibility effect is found to significantly affect the flow coefficient (Cf), as Cf decreases with increasing intake pressure drop, if the compressibility effect is neglected in calculation by the typical evaluation method; while Cf has no significant change if the compressibility effect is included. Compared with the two methods, the deviation of the theoretical intake velocity and the density of the intake flow is the reason for Cf calculation error. For the transient intake condition, such increase of intake flow velocity with increasing intake pressure was found to be valid only at low engine speeds (2000 rpm). At high engine speeds (4000 rpm), however, flow velocity remains almost unchanged regardless of the intake pressure. This implies that flow velocity is determined by the effective pressure difference across the intake ports, which is synergistically controlled by the initial intake pressure difference and the piston wall confinement, during early intake process, while the intake velocity is restricted by the piston motion speed in the middle and later intake stroke. As such, the increased intake mass in cylinder is mainly resulted from the larger intake gas density rather than the higher flow velocity in supercharged engines. Furthermore, the supercharging may cause a high Ma for high engine speed round the valve seats and valve stems at low valve lift; while the engine speed is the main reason for high Ma intake flow under intake process at high valve lift.
CitationFeng, Y., Lu, Z., Wang, T., Cai, J. et al., "Effect of Supercharging on the Intake Flow Characteristics of a Swirl-Supported Engine," SAE Technical Paper 2020-01-0794, 2020, https://doi.org/10.4271/2020-01-0794.
Data Sets - Support Documents
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- Reitz, R.D., Ogawa, H., Payri, R., Fansler, T., Kokjohn, S. et al. “IJER editorial: The Future of the Internal Combustion Engine,” 2019, 1468087419877990.
- Turner, J.W.G., Popplewell, A., Patel, R., Johnson, T.R. et al. , “Ultra Boost for Economy: Extending the Limits of Extreme Engine Downsizing,” SAE International Journal of Engines 7(1):387-417, 2014, doi:10.4271/2014-01-1185.
- Thirouard, M. and Pacaud, P. , “Increasing Power Density in HSDI Engines as an Approach for Engine Downsizing,” SAE International Journal of Engines 3(2):56-71, 2010, doi:10.4271/2010-01-1472.
- Han, D., Han, S.K., Han, B.H., and Kim, W. , “Development of 2.0 L Turbocharged DISI Engine for Downsizing Application,” SAE Technical Paper 2007-01-0259, 2007, https://doi.org/10.4271/2007-01-0259.
- Johnson, T.V. , “Review of Diesel Emissions and Control,” Int. J. Engine Res. 10(5):275-285, 2009, doi:10.1243/14680874JER04009.
- Su, J., Xu, M., Li, T., Gao, Y., and Wang, J. , “Combined Effects of Cooled EGR and a Higher Geometric Compression Ratio on Thermal Efficiency Improvement of a Downsized Boosted Spark-Ignition Direct-Injection Engine,” Energy Convers Manag 78:65-73, 2014, doi:10.1016/j.enconman.2013.10.041.
- Hu, B., Turner, J.W., Akehurst, S., Brace, C., and Copeland, C. , “Observations on and Potential Trends for Mechanically Supercharging a Downsized Passenger Car Engine: A Review,” Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231(4):435-456, 2017, doi:10.1177/0954407016636971.
- Keidel, S., Wetzel, P., Biller, B., Bevan, K. et al. , “Diesel Engine Fuel Economy Improvement Enabled by Supercharging and Downspeeding,” SAE Int. J. Commer. Veh. 5(2):483-493, 2012 https://doi.org/10.4271/2012-01-1941.
- Blair, G.P. and Drouin, F.M.M. , “Relationship between Discharge Coefficients and Accuracy of Engine Simulation,” SAE Technical Paper 962527, 1996, https://doi.org/10.4271/962527.
- Blair, G., Callender, E., and Mackey, D. , “Maps of Discharge Coefficients for Valves, Ports and Throttles,” SAE Technical Paper 2001-01-1798, 2001, https://doi.org/10.4271/2001-01-1798.
- Xu, H. , “Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads,” SAE Technical Paper 2001-01-1308, 2001, https://doi.org/10.4271/2001-01-1308.
- Li, X., Zhao, L., Liu, F., Wang, X. and Su, L. , “Study on Characteristics of Intake Port on Supercharged Diesel Engine,” in 2012 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, 2012, 659-662, IEEE, doi:10.1109/CDCIEM.2012.161.
- Borée, J., Miles, P. , “In-Cylinder Flow,” in Encyclopedia of Automotive Engineering, John Wiley & Sons Ltd., 2014, doi:10.1002/9781118354179. auto119.
- Braun, M., Klaas, M., and Schröder, W. , “High-Speed 3D Measurements of the Influence of Intake Pressure on the In-Cylinder Flow in a DISI Engine,” SAE Technical Paper 2019-01-2251, 2019.
- Yang, X., Chen, Z., and Kuo, T.W. , “Pitfalls for Accurate Steady State Port Flow Simulations,” Journal of Engineering for Gas Turbines and Power 135:061601, 2013, doi:10.1115/1.4023492.
- Fang, T. and Singh, S. , “Predictions of Flow Separation at the Valve Seat for Steady State Port-Flow Simulation,” J. Eng. Gas Turbines Power. 137(11):111512, 2015, doi:10.1115/1.4030501.
- Sun, Y.Z., Che, Z.Z., Sun, K., Wang, T.Y. et al. , “Measurements of Turbulence Sources in a Swirl-Supported Diesel Engine,” Int. J. Engine Res., 2019, doi:10.1177/1468087419870415.
- Sun, Y.Z., Sun, K., Wang, T.Y., Li, Y.F., and Lu, Z. , “Effects of Squish Flow on Tangential Flow and Turbulence in a Diesel Engine,” J. Eng. Gas Turbines Power 141(5):052802, 2019, doi:10.1115/1.4042612.
- Jia, M., Lu, Z., Wang, T., Li, Y. et al. , “Numerical Investigation of the Intake Flow of a Four-Valve Diesel Engine,” SAE Technical Paper 2017-01-2211, 2017, https://doi.org/10.4271/2017-01-2211.
- Schmitt, M., Christos, E., Frouzakis, A.G., Tomboulides, Y.M., and Wright, K.B. , “Direct Numerical Simulation of Multiple Cycles in a Valve/Piston Assembly,” Physics of Fluids 19 26(3):035105, 2014, doi:10.1063/1.4868279.