Abstract
In this paper, the investigation into in-cylinder tumble flow characteristics with reduced Maximum Valve Lifts (MVL) is presented. The experimental work was conducted in a modified four-valve Spark-Ignition (SI) test engine, with optical accesses for measuring in-cylinder air motion in the vertical direction. Three different MVL of 6.8 mm, 4.0 mm and 1.7 mm were tested and Particle Image Velocimetry (PIV) was employed for those measurements. Measurement results were analysed by examining the tumble flow field, the tumble ratio variation and the fluctuating kinetic energy distribution. Meanwhile, a numerical analysis method for detecting the vortex centre was developed. From results of the vortex centre distribution, the cyclic variation of the in-cylinder flow was explored. The phase-averaged flow fields show that higher MVLs could produce stronger vertical flows which turn more toward to the piston top and finally are possible to form big scale tumble flow structure. Although lower MVLs create a higher tumble ratio when the piston is close to the Bottom Dead Centre (BDC), higher MVLs substantially produce higher tumble ratios when the piston is moving close to the Top Dead Centre (TDC). In terms of kinetic energy, lower MVLs result in higher values including higher total kinetic energy and higher fluctuating energy. Finally, the vortex centres results demonstrate lower MVLs could enhance cycle-to-cycle variation due to the weakened tumble vortex.
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Hong, H., Parvate-Patil, G.B., Gordon, B.: Review and analysis of variable valve timing strategies - eight ways to approach. Proc. Instn. Mech. Eng. Part D 218, 1179–1200 (2004)
Nagaya, K., Kobayashi, H., Koike, K.: Valve timing and valve lift control mechanism for engines. Mechatronics 16, 121–129 (2006)
Peng, Z., Jia, M.: Full engine cycle cfd investigation of effects of variable intake valve closing on diesel pcci combustion and emissions. Energy and Fuels 23 (12), 5855–5864 (2009)
Stiehl, R., Schorr, J., Krüger, C., Dreizler, A., Böhm, B.: In-cylinder flow and fuel spray interactions in a stratified spray-guided gasoline engine investigated by high-speed laser imaging techniques. Flow, Turbulence and Combustion 91, 431–450 (2013). doi:10.1007/s10494-013-9500-x
Stan, C., et al: GDI compact four stroke engine – an advanced concept for vehicle application. SAE paper 2004-01-0039 (2004)
Tian, G., Wang, Z., Ge, Q.: Control of SI/HCCI mode transition on a GDI engine. Proc. Instn. Mech. Eng. Part D: J. Automob. Eng. 221 (7), 867–875 (2007)
Lee, K., Lee, C.: An experimental study of the extent of the operating region and emission characteristics of stratified combustion using the controlled autoignition method. Energy and Fuels 20, 1862–1869 (2006)
Wang, T., Peng, Z., Liu, S-L., Zhao, H.: Optimization of stratification combustion in a spark ignition engine by double-pulse port fuel injection. Proc. Instn. Mech. Eng. Part D: J. Automob. Eng. 221, 845–857 (2007)
Yi, Y., DeMinco, C.M.: Numerical Investigation of Mixture Preparation in a GDI Engine. SAE paper 2006-01-3375 (2006)
Gray, C.: A review of variable engine valve timing. SAE paper 880386 (1988)
Flierl, R., Gollasch, D., Knech, T.A., Hannibal, W.: Improvements to a Four Cylinder Gasoline Engine Through the Fully Variable Valve Lift and Timing System UniValve. SAE paper 2006-01-0223 (2006)
Lee, H.B., Kwon, H., Min, K.: Effects of various of vva systems on the engine fuel economy and optimization of a CVVT-VVL si engine using 1d simulation. Int. J. Automot. Technol. 8 (75–685) (2007)
Diana, S., Iorio, B., Giglio, V., Police, G.: The Effect of Valve Lift Shape and Timing on Air Motion and Mixture Formation of DISI Engines Adopting Different VVA Actuators. SAE Paper 2001-01-3553 (2001)
Stansfield, P. A., et al: Unthrottled Engine Operation using Variable Valve Actuation: The Impact on the Flow Field, Mixing and Combustion. SAE paper 2007-01-1414 (2007)
Grimaldi, F., Gervais, D., Marchal, A., Floch, A.: Single-Cylinder Experiments for Downsizing-Oriented SI Concepts: GDI and VVL Thermodynamic Comparison. SAE Paper 2007-24-0013 (2004)
Kiyoshi, H., Kazumasa, L., Hirohumi, H.: Development of a New Multi-Mode Variable Valve Timing Engine[C]. SAE Paper 930878 (1993)
Flierl, R., Klüting, M.: The Third Generation of Valvetrains – New Fully Variable Valvetrains for Throttle-Free Load Control. SAE Paper 2000-01-1227 (2000)
Stokes, J., Lake, T. H., Murphy, R. D.: Gasoline Engine Operation with Twin Mechanical Variable Lift (TMVL) Valvetrain Stage 1: SI and CAI Combustion with Port Fuel Injection. SAE Paper 2005-01-0752 (2005)
Sellnau, M., Kunz, T., Sinnamon, J., Burkhard, J.: 2-step Variable Valve Actuation: System Optimization and Integration on an SI Engine. SAE Paper 2006-01-0040 (2006)
Cleary, D., Silvas, G.: Unthrottled Engine Operation with Variable Intake Valve Lift, Duration, and Timing[C]. SAE Paper 2007-01-1282 (2007)
Böhm, B., Heeger, C., Gordon, R. L., Dreizler, A.: New perspectives on turbulent combustion: multi-parameter high-speed planar laser diagnostics. Flow, Turbulence and Combustion 86, 313–341 (2013). doi:10.1007/s10494-010-9291-2
Fischer, J., Velji, A., Spicher, U.: Investigation of Cycle-to-Cycle Variations of In-Cylinder Processes in Gasoline Direct Injection Engines Operating With Variable Tumble Systems. SAE Paper 2004010044 (2004)
Liu, K., Haworth, D.C., Yang, X., Gopalakrishnan, V.: Large-eddy simulation of motored flow in a two-valve piston engine: POD analysis and cycle-to-cycle variations. Flow, Turbulence and Combustion 91, 373–403 (2013). doi:10.1007/s10494-013-9475-7
Hasse, C., Sohm, V., Durst, B.: Numerical investigation of cyclic variations in gasoline engines using a hybrid URANS/LES modeling approach. Computers & Fluids 39, 25–48 (2010)
Partington, G. D.: Analysis of steady flow tests on inlet and exhaust ports. DP 80/1123, Ricardo Consulting Engineers (1980)
Stone, C. R., Ladommatos, N.: The Measurement and Analysis of Swirl in Steady Flow. SAE Paper 921642 (1992)
Reuss, D. L., Adrian, R. J., Landreth, C. C., French, D. T., Fansler, T. D.: Instantaneous Planar Measurements of Spatial Velocity and Large-Scale Vorticity and Strain Rate in an Engine Using Particle-Image Velocimetry. SAE paper 890616 (1989)
Druault, P., Guibert, P., Alizon, F.: Use of proper orthogonal decomposition for time interpolation from PIV data Application to the cycle-to-cycle variation analysis of in-cylinder engine flows. Exp. Fluids 39, 1009–1023 (2005)
Müller, S. H. R., Böhm, B., Gleißner, M.: Flow field measurements in an optically accessible, direct-injection spray-guided internal combustion engine using high-speed PIV. Exp. Fluids 48, 281–290 (2010)
Vollmers, H.: Detection of vortices and quantitative evaluation of their main parameters from experimental velocity data. Meas. Sci. Technol. 12, 1199–1207 (2001)
Scarano, F., Benocci, C., Reithmuller, M.: Pattern recognition analysis of the turbulent flow past a backward facing step. Phys. Fluids 11 (12), 3808–3818 (1999)
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Wang, T., Liu, D., Tan, B. et al. An Investigation into In-Cylinder Tumble Flow Characteristics with Variable Valve Lift in a Gasoline Engine. Flow Turbulence Combust 94, 285–304 (2015). https://doi.org/10.1007/s10494-014-9562-4
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DOI: https://doi.org/10.1007/s10494-014-9562-4