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Novel Geometry Reaching High Efficiency for Multiple Injector Concepts
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 2, 2019 by SAE International in United States
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Heat losses are known to decrease the efficiency of CI engines largely. Here, multiple injectors have been suggested to shrink these losses through reduction of spray wall impingement. Studies on multiple injectors have proven the concept’s heat transfer reduction but also highlighted the difficulty of using a standard piston bowl. This study proposes a two-injector concept combined with a flat bowl to reduce heat losses further. To change the spray pattern, the two injectors are injecting in a swirling motion while placed at the rim of the bowl. Four injection timings have been investigated using Reynolds-Averaged Navier-Stokes simulations. This computational method quantified the amount of heat loss reduction possible. A conventional single injector concept is compared to two injector concepts with a standard and flat bowl. A Double Compression Expansion Engine (DCEE) concept, based on a modified Volvo D13 single-cylinder engine, was the base for all simulations. The DCEE can re-use the residual exhaust energy for a second expansion meaning increased importance of reduced heat losses. Heat release effects were discarded in the evaluation as an explanation for the reduced heat losses in order to isolate the effects of the changed spray pattern. Results showed a decrease in heat losses by 25.1 % or 4.2 % of the fuel energy as well as an increased IMEP of 4.5 % or 1.9 % of the fuel energy. Together with the increased exhaust energy, results showed a possible total engine efficiency increase of 2.6 % using the DCEE concept. This work successfully proves the benefits of using two injectors with a flat bowl over a standard bowl and the conventional one-injector strategy.
CitationNyrenstedt, G., Im, H., Andersson, A., and Johansson, B., "Novel Geometry Reaching High Efficiency for Multiple Injector Concepts," SAE Technical Paper 2019-01-0246, 2019, https://doi.org/10.4271/2019-01-0246.
Data Sets - Support Documents
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- European Commission, “Reducing CO2 Emissions from Heavy-Duty Vehicles,” https://ec.europa.eu/clima/policies/transport/vehicles/heavy_en (accessed 2018-05-10)
- European Environment Agency, “Carbon Dioxide Emissions from Europe’s Heavy-Duty Vehicles,” https://www.eea.europa.eu/themes/transport/heavy-duty-vehicles/carbon-dioxide-emissions-europe (accessed 2018-09-23)
- Caton, J.A., “Comparisons of Global Heat Transfer Correlations for Conventional and High Efficiency Reciprocating Engines,” in ASME. Internal Combustion Engine Division Fall Technical Conference, ASME 2011 Internal Combustion Engine Division Fall Technical Conference, 327-337, doi:10.1115/ICEF2011-60017.
- Noehre, C., Andersson, M., Johansson, B., and Hultqvist, A., “Characterization of Partially Premixed Combustion,” SAE Technical Paper 2006-01-3412, 2006, doi:10.4271/2006-01-3412.
- Sjöberg, M. and Dec, J., “Combined Effects of Fuel-Type and Engine Speed on Intake Temperature Requirements and Completeness of Bulk-Gas Reactions for HCCI Combustion,” SAE Technical Paper 2003-01-3173, 2003, doi:10.4271/2003-01-3173.
- Manente, V., Johansson, B., Tunestal, P., and Cannella, W., “Effects of Different Type of Gasoline Fuels on Heavy Duty Partially Premixed Combustion,” SAE Int. J. Engines 2(2):71-88, 2010, doi:10.4271/2009-01-2668.
- Bhavani Shankar, V., Lam, N., Andersson, A., and Johansson, B., “Optimum Heat Release Rates for a Double Compression Expansion (DCEE) Engine,” SAE Technical Paper 2017-01-0636, 2017, doi:10.4271/2017-01-0636.
- Lam, N., Tuner, M., Tunestal, P., Andersson, A. et al., “Double Compression Expansion Engine Concepts: A Path to High Efficiency,” SAE Int. J. Engines 8(4):2015, doi:10.4271/2015-01-1260.
- Lam, N., Andersson, A., and Tunestal, P., “Double Compression Expansion Engine Concepts: Efficiency Analysis over a Load Range,” SAE Technical Paper 2018-01-0886, 2018, doi:10.4271/2018-01-0886.
- Bhavani Shankar, V.S., Johansson, B., and Andersson, A., “Double Compression Expansion Engine: A Parametric Study on a High-Efficiency Engine Concept,” SAE Technical Paper 2018-01-0890, 2018, doi:10.4271/2018-01-0890.
- Okamoto, T. and Uchida, N., “New Concept for Overcoming the Trade-Off between Thermal Efficiency, Each Loss and Exhaust Emissions in a Heavy Duty Diesel Engine,” SAE Int. J. Engines 9(2):2016, doi:10.4271/2016-01-0729.
- Nyrenstedt, G., Al Turkestani, T., Im, H., and Johansson, B., “CFD Study of Heat Transfer Reduction Using Multiple Injectors in a DCEE concept,” SAE Technical Paper 2019-01-0070, 2019, doi:10.4271/2019-01-0070.
- Reitz, R. and Diwakar, R., “Structure of High-Pressure Fuel Sprays,” SAE Technical Paper 870598, 1987, doi:10.4271/870598.
- Amsden, A.A., O'rourke, P.J., and Butler, T.D., “KIVA-II: A Computer Program for Chemically Reactive Flows with Sprays (No. LA-11560-MS),” Los Alamos National Lab, NM, USA, 1989.
- Richards, K.J., Senecal, P.K., and Pomraning, E., “CONVERGE (Version 1.4.1) Manual,” Convergent Science, Inc., Middleton, WI, 2012.
- Sivasankaralingam, V., Raman, V., Mubarak Ali, M., Alfazazi, A. et al., “Experimental and Numerical Investigation of Ethanol/Diethyl Ether Mixtures in a CI Engine,” SAE Technical Paper 2016-01-2180, 2016, doi:10.4271/2016-01-2180.
- Amsden, A. A., “KIVA-3V: A Block Structured KIVA Program for Engines with Vertical or Canted Valves,” Los Alamos National Laboratory Report No. LA-13313-MS, 1997.
- Babajimopoulos, A., Assanis, D.N., Flowers, D.L., Aceves, S.M. et al., “A Fully Coupled Computational Fluid Dynamics and Multi-Zone Model with Detailed Chemical Kinetics for the Simulation of Premixed Charge Compression Ignition Engines,” International Journal of Engine Research 6:497-512, 2005, doi:10.1243/146808705X30503.
- Zeuch, T., Moréac, G., Ahmed, S.S., and Mauss, F., “A Comprehensive Skeletal Mechanism for the Oxidation of n-heptane Generated by Chemistry-Guided Reduction,” Combustion and Flame 155(4):651-674, 2008.
- Aronsson, U., Solaka, H., Lequien, G., Andersson, O. et al., “Analysis of Errors in Heat Release Calculations Due to Distortion of the In-Cylinder Volume Trace from Mechanical Deformation in Optical Diesel Engines,” SAE Int. J. Engines 5(4):1561-1570, 2012, doi:10.4271/2012-01-1604.