Abstract
The stratified fuel distribution and early flame development in a firing spray-guided direct-injection spark-ignition (DISI) engine are characterized applying optical diagnostics. The goal is to compare effects of single and double injections on the stratified air–fuel mixing and early flame development. Vaporized in-cylinder fuel distributions resulting from both single and double injections before, during and after ignition are selectively visualized applying Rayleigh scattering. Reynolds-averaged Navier–Stokes (RANS) simulations are performed to facilitate interpretation of the obtained experimental data. Two hypotheses are tested. First, injecting the fuel as a closely coupled double injections can improve mixing. Second, the better mixing putatively associated with double injections is mainly due to either a longer mixing time or higher mixing rate (driven by turbulence generated by the injections). The optical investigation of the in-cylinder fuel distributions and early flame propagation corroborated the better mixing, showing that double injections are associated with more evenly distributed fuel, fewer local areas with high fuel concentrations, faster initial flame spread and more even flame propagation (more circular flame spreading). The results from both the experiments and the simulations support the hypothesis that delivering fuel in closely coupled double injections results in better mixing than corresponding single injections. According to the simulations, the improved mixing stems from the longer time available for mixing of the air and fuel in double injection events, which has stronger effects than the higher computed peak bulk mixing rate for single injections.
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References
van Basshuysen, R., Spicher, U.: Gasoline Engine with Direct Injection: Processes, Systems, Development, Potential. Vieweg+Teubner, Leipzig (2009)
Fansler, T.D., Reuss, D.L., Sick, V., Dahms, R.N.: Combustion instability in spray-guided stratified-charge engines: A review. Int. J. Engine Res. 16(3), 260–305 (2015)
Alkidas, A.C.: Combustion advancements in gasoline engines. Energy Conserv. Manage. 48, 2751–2761 (2007)
Hemdal, S., Andersson, M., Dahlander, P., Ocheterena, R., Denbratt, I.: In-cylinder soot imaging and emissions of stratified combustion in a spark-ignited spray-guided direct-injection gasoline engine. Int. J. Engine Res. 12(6), 549–563 (2011)
Oh, H., Bae, C.: Effects of the injection timing on spray and combustion characteristics in a spray-guided DISI engine under lean stratified conditions. Fuel 107, 225–235 (2013)
Dahms, R.N., Drake, M.C., Fansler, T.D., Kuo, T.-W., Peters, N.: Understanding ignition processes in spray-guided gasoline engines using high-speed imaging and the extended spark ignition model Spark CIMM Part B: Importance of molecular fuel properties in early flame front propagation. Combust. Flame 158, 2245–2260 (2011)
Dahms, R.N., Drake, M.C., Fansler, T.D., Kuo, T.-W., Peters, N.: Understanding ignition processes in spray-guided gasoline engines using high-speed imaging and the extended spark ignition model Spark CIMM Part A: Spark channel processes and the turbulent flame front propagation. Combust. Flame 158, 2229–2244 (2011)
Petersen, B., Sick, V.: Simultaneous flow field and fuel concentration imaging at 4.8 kHz in an operating engine. Appl. Phys. B 97, 887–895 (2009)
Petersen, B., Reuss, D.L., Sick, V.: On the ignition and flame development in a spray-guided direct-injection spark-ignited engine. Combust. Flame 161, 240–255 (2014)
Johansen, L.C.R., Hemdal, S.: In cylinder visualization of stratified combustion of E85 and main sources of soot formation. Fuel 159, 392–411 (2015)
de Francqueville, L., Effects of ethanol addition in RON 95 gasoline on GDI stratified combustion. SAE technical Paper 2011-24-0055 (2011)
Oh, H., Bae, C., Park, J., Jeon, J.: Effect of multiple injection on stratified combustion characteristics in a spray-guided DISI engine under lean stratified operation. SAE Technical Paper 2011-24-0059 (2011)
Johansen, L.C.R., Hemdal, S., Denbratt, I.: Comparison of E10 and E85 spark ignited stratified combustion and soot formation. Fuel 205, 11–23 (2017)
Zeng, W., Sjöberg, M., Reuss, D.: Using PIV measurements to determine the role of the in-cylinder flow field for stratified DISI engine combustion. SAE Int. J. Engines 7(2), 615–632 (2014)
Stiehl, R., Schorr, J., Kruger, 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 Turbul. Combust. 91, 431–450 (2013)
Aleferis, P.G., Serras-Pereira, J., van Romunde, Z.R., Caine, J., Wirth, M.: Mechanisms of spray formation and combustion from a multi-hole injector with e85 and gasoline. Combust. Flame 157, 735–756 (2010)
Aleferis, P.G., van Romunde, Z.R.: An analysis of spray development with iso-octane, n-pentane, gasoline, ethanol and n-butanol from a multi-hole injector under hot fuel conditions. Fuel 105, 143–168 (2013)
Stiehl, R., Bode, J., Schorr, J., Kruger, C., Dreizler, A., Böhm, B.: Influence of intake geometry variations on in-cylinder flow and flow-spray interactions in a stratified direct-injection spark-ignition engine captured by time-resolved particle image velocimetry. Int. J. Engine Res. 17(9), 983–997 (2016)
Smith, J.D., Sick, V.: Crank-angle resolved imaging of biacetyl laser-induced fluorescence in an optical internal combustion engine. Appl. Phys. B 81, 579–584 (2005)
Hemdal, S.: Characterization of stratified fuel distribution and charge mixing in a DISI engine using Rayleigh scattering. Combust. Flame 193, 218–228 (2018)
Converge CFD Homepage. https://convergecfd.com/. Last accessed 21 Jan 2021
Yakhot, V., Orszag, S.A., Thangam, S., Gatski, T.B., Speziale, C.G.: Development of turbulence models for shear flows by a double expansion technique. Phys. Fluids A 4, 1510–1520 (1992)
Reitz, R.D.: Modeling atomization processes in high-pressure vaporizing sprays. Atomization Spray Technol. 3, 309–337 (1987)
Kong, S.-C., Han, Z., Reitz, R.D.: The development and application of a diesel ignition and combustion model for multidimensional engine simulation. SAE Paper No. 950278 (1995)
Xin, J., Ricart, L., Reitz, R.D.: Computer modeling of Diesel spray atomization and combustion. Combust. Sci. Technol. 137, 171–194 (1998)
Patterson, M.A., Reitz, D.R.: Modeling the effects of fuel spray characteristics on diesel engine combustion and emission. SAE Technical Paper 980131 (1998)
Beale, J.C., Reitz, R.D.: Modeling spray atomization with the Kelvin-Helmholtz/Rayleigh-Taylor model. Atom. Sprays 9, 623–650 (1999)
Senecal, R.K., Schmidt, D.P., Nouar, I., Rutland, C.J., Reitz, R.D., Corradini, M.L.: Modeling high-speed viscous liquid sheet atomization. Int. J. Multiph. Flow 25, 1073–1097 (1999)
Schmidt, D.P., Nouar, I., Senecal, R.K., Rutland, C.J., Reitz, R.D., Hoffman, J.A.: Pressure-swirl atomization in the near field. SAE Technical Paper 1999-01-0496 (1999)
Schmidt, D.P., Rutland, C.J.: A new droplet collision algorithm. J. Comput. Phys. 164, 62–80 (2000)
Amsden, A.A., O’Rourke, P.J., Butler, T.D.: KIVA-II: A computer program for chemically reactive flows with sprays. Los Alamos National Laboratory Report No. LA-11560-MS (1989)
Huang C., Lipatnikov, A.: Modelling of gasoline and ethanol hollow-cone sprays using OpenFOAM. SAE Technical Paper 2011-01-1896 (2011)
Hemdal, S., Denbratt, I., Dahlander, P., Warnberg, J.: Stratified cold start sprays of gasoline-ethanol blends. SAE Int. J. Fuels Lubr. 2(1), 683–696 (2009)
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This work was supported by Combustion Engine Research Center (CERC). The second author (AL) is grateful to Converge CFD for granting a license for using their software.
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Hemdal, S., Lipatnikov, A.N. (2022). Investigation of Charge Mixing and Stratified Fuel Distribution in a DISI Engine Using Rayleigh Scattering and Numerical Simulations. In: Parikyan, T. (eds) Advances in Engine and Powertrain Research and Technology. Mechanisms and Machine Science, vol 114. Springer, Cham. https://doi.org/10.1007/978-3-030-91869-9_8
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DOI: https://doi.org/10.1007/978-3-030-91869-9_8
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