CFD Study of the Effect of Engine Speed on the Combustion Process and the Formation of Pollutants in a Diesel Engine
CFD Study of the Effect of Engine Speed on the Combustion Process and the Formation of Pollutants in a Diesel Engine |
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| © 2023 by IJETT Journal | ||
| Volume-71 Issue-10 |
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| Year of Publication : 2023 | ||
| Author : Fabrice Parfait Nang Nkol, Nelson Junior Issondj Banta, Claude Valery Ngayihi Abbe, Ruben Mouangue |
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| DOI : 10.14445/22315381/IJETT-V71I10P215 | ||
How to Cite?
Fabrice Parfait Nang Nkol, Nelson Junior Issondj Banta, Claude Valery Ngayihi Abbe, Ruben Mouangue, "CFD Study of the Effect of Engine Speed on the Combustion Process and the Formation of Pollutants in a Diesel Engine," International Journal of Engineering Trends and Technology, vol. 71, no. 10, pp. 163-172, 2023. Crossref, https://doi.org/10.14445/22315381/IJETT-V71I10P215
Abstract
This article presents a numerical study on the influence of engine speed on the combustion process and the formation of pollutant emissions in a compression ignition engine. The literature shows that the movement of the air impacts the combustion process and, therefore, pollutants. Experimental studies have shown that at higher engine speeds, an increase in turbulence is created in the cylinders, thus improving the air/fuel mixture. However, few studies address the fundamental factors of varied engine speed at reduced steps for a certain range. This study develops and validates a CFD model with experimental data to predict the combustion scenario. Zeldovich extended mechanism, Hiroyasu model, and Kelvin-Helmohtz model are adopted to calculate NOx, soot, and spray quality, respectively. The engine speed was varied between 1500 and 2000 RPM with an increment of 100 RPM to better analyze and optimize combustion parameters and pollutant variations. The results of this research show that at higher engine speeds, fuel consumption is reduced in a shorter time by improving the air/fuel mix. The combustion time is shorter, which means less time for NOx and soot emissions. The improved air/fuel mix significantly reduces NOx and soot by about 38% and 40%, respectively. The results of these calculations show that the combustion process and the formation of pollutants strongly depend on the engine speed and load as a function of the crankshaft angle under ignition conditions. The results also show that engine speed and injection timing can be adopted in order to establish optimal engine power conditions based on low pollutant emissions and correct engine and exhaust temperatures in a compression ignition engine. This study blocks the benefits of using computational fluid dynamics (CFD) to better predict a diesel engine's combustion process and pollutant emissions.
Keywords
CFD, Engine speed, Combustion, Pollutants, Diesel Engine.
References
[1] Feiyang Zhao, Wenming Yang, and Wenbin Yu, “A Progress Review of Practical Soot Modeling Development in Diesel Engine Combustion,” Journal of Traffic and Transportation Engineering (English Edition), vol. 7, no. 3, pp. 269-281, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[2] E. Jiaqiang et al., “Effects of Injection Timing and Injection Pressure on Performance and Exhaust Emissions of a Common Rail Diesel Engine Fueled by Various Concentrations of Fish-Oil Biodiesel Blends,” Energy, vol. 149, pp. 979-989, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[3] Hamid Omidvarborna, Ashok Kumar, and Dong-Shik Kim, “Recent Studies on Soot Modeling for Diesel Combustion,” Renewable and Sustainable Energy Reviews, vol. 48, pp. 635-647, 2015.
[CrossRef] [Google Scholar] [Publisher Link]
[4] Haroun A.K. Shahad, and Saad K. Wabdan, “Effect of Operating Conditions on Pollutants Concentration Emitted from a Spark Ignition Engine Fueled with Gasoline Bioethanol Blends,” Journal of Renewable Energy, vol. 2015, 2015.
[CrossRef] [Google Scholar] [Publisher Link]
[5] A. Uludogan, David E. Foster, and Rolf Reitz, “Modeling the Effect of Engine Speed on the Combustion Process and Emissions in a DI Diesel Engine,” SAE Technical Paper, 1996.
[CrossRef] [Google Scholar] [Publisher Link]
[6] M.A. Patterson et al., “Modeling the Effects of Fuel Injection Characteristics on Diesel Engine Soot and NOx Emission,” SAE Transactions, pp. 836-852, 1994.
[Google Scholar] [Publisher Link]
[7] Malin Alrikson, and Ingemar Denbratt, “Low Temperature Combustion in a Heavy-Duty Diesel Engine using High Levels of EGR,” SAE Technical Paper, 2006.
[CrossRef] [Google Scholar] [Publisher Link]
[8] Bui Van Ga et al., “Numerical Simulation Studies on Performance, Soot and NOx Emissions of Dual-Fuel Engine Fuelled with Hydrogen Enriched Biogas Mixtures,” IET Renewable Power Generation, vol. 12, no. 10, pp. 1111-1118, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[9] Yong Sun, and Rolf D. Reitz, “Modeling Diesel Engine NOx and Soot Reduction with Optimized Two-Stage Combustion,” SAE Technical paper, 2006.
[CrossRef] [Google Scholar] [Publisher Link]
[10] Daniel A. Nehmer, and Rolf D. Reitz, “Measurement of the Effect of Injection Rate and Split Injections on Diesel Engine Soot and NOx Emissions,” SAE Transactions, pp. 1030-1041, 1994.
[Google Scholar] [Publisher Link]
[11] Adam B. Dempsey, Scott J. Curran, and Robert M. Wagner, “A Perspective on the Range of Gasoline Compression Ignition Combustion Strategies for High Engine Efficiency and Low NOx and Soot Emissions: Effects of in-Cylinder Fuel Stratification,” International Journal of Engine Research, vol. 17, no. 8, pp. 897-917, 2016.
[CrossRef] [Google Scholar] [Publisher Link]
[12] Victor lorga-Siman, “Study by Numerical Simulation of Flows in the Intake Duct of an Engine with Variable Intake Valve Lift,” Doctoral Thesis in Energy, 2012.
[Google Scholar] [Publisher Link]
[13] H. Weller et al., “Prediction of Combustion in Homogeneous-Charge Spark-Ignition Engine,” International Symposium COMODIA 94, pp. 163-169, 1994.
[Google Scholar] [Publisher Link]
[14] Heywood B. John, “Combustion and its Modeling in Spark-Ignition Engine,” International Symposium COMODIA 94, pp. 1-15, 1994.
[Google Scholar] [Publisher Link]
[15] David L. Reuss et al., “Particule Image Velocimetry Measurements in a High-Swirl Engine used for Evaluation of Computational Fluid Dynamics Calculations,” SAE Transactions, vol. 104, pp. 2073-2092, 1995.
[CrossRef] [Google Scholar] [Publisher Link]
[16] G.M. Kosmadakis, E.G. Pariotis, and C.D. Rakopoulos, “Heat Transfer and Crevice Flow in a Hydrogen-Fueled Spark-Ignition Engine: Effect on the Engine Performance and No Exhaust Emissions,” International Journal of Hydrogen Energy, vol. 38, no. 18, pp. 7477–7489, 2013.
[CrossRef] [Google Scholar] [Publisher Link]
[17] Zhi Wang et al., “A Computational Study of Direct Injection Gasoline HCCI Engine with Secondary Injection,” Fuel, vol. 85, no. 12–13, pp. 1831–1841, 2006.
[CrossRef] [Google Scholar] [Publisher Link]
[18] Francesca Di Mare, Robert Knappstein, and Michael Baumann, “Application of LES Quality Criteria to Internal Combustion Engine Flows,” Computers & Fluids, vol. 89, pp. 200–213, 2014.
[CrossRef] [Google Scholar] [Publisher Link]
[19] Christian Angelberger, and Sebastien Candel, “Editorial-IFP Energies Nouvelles Scientific Meeting LES4ICE 2012-Large-scale Simulation for Flows in Internal Combustion Engines,” Oil & Gas Science and Technology–IFP Energies Nouvelles Review, vol. 69, no. 1, pp. 3-9, 2014.
[CrossRef] [Google Scholar] [Publisher Link]
[20] A. Imren, and D.C. Haworth, “On the Merits of Extrapolation-based ODE Solvers for Combustion CFD, Combustion and Flame, vol. 174, pp. 1-15, 2016.
[CrossRef] [Google Scholar] [Publisher Link]
[21] Marco Mehl et al., “An Approach for Formulating Surrogates for Gasoline with Application toward a Reduced Surrogate Mechanism for Engine Modeling,” Energy Fuels, vol. 25, no. 11, pp. 5215-5223, 2011.
[CrossRef] [Google Scholar] [Publisher Link]
[22] Lei Zhang, “Parallel Simulation of Engine in-Cylinder Processes with Conjugate Heat Transfer Modeling,” Applied Thermal Engineering, vol. 142, pp. 232-240, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[23] Stephen Bush, “Sandia’s New Medium-Duty Diesel Research Engine and what we're going to do with it,” Sandia National Laboratories, 2020.
[Google Scholar] [Publisher Link]
[24] Mohamed Ali Djemal, “Development of a Simulator for the Diesel Engine to Study Performance and Dynamic Behavior, ” Semaphor, Electronic Document Collections, pp. 1-108, 2020.
[Google Scholar] [Publisher Link]
[25] Stephen Busch et al., “Experimental and Numerical Studies of Bowl Geometry Impacts on Thermal Efficiency in a Light-Duty Diesel Engine,” SAE Technical Paper, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[26] Stephen Busch et al., “Bowl Geometry Effects on Turbulent Flow Structure in a Direct Injection Diesel Engine,” SAE Technical Paper, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[27] Zha Kan et al., “A Study of Piston Geometry Effects on Late-Stage Combustion in a Light-Duty Optical Diesel Engine using Combustion Image Velocimetry,” SAE International Journal of Engines, vol. 11, no. 6, pp. 783-804, 2018.
[Google Scholar] [Publisher Link]
[28] K. Theofanidis, Y. Lu, and A. Kovacevic, “CFD Analysis on the Effect of Discharge Port Geometry of the Hook and Claw Vacuum Pumps,” IOP Conference Series: Materials Science and Engineering, vol. 1180, pp. 1-10, 2021.
[CrossRef] [Google Scholar] [Publisher Link]
[29] ANSYS Forte Simulate Guide, Forte Tutorials, Forte Theory Manual, 2020. [Online]. Available: https://academica-e.unavarra.es/xmlui/bitstream/handle/2454/37481/Memoria%20TFG_Sergio%20Pe%26%23769%3Brez%20de%20Albe%26%23769%3Bniz%20Azqueta_ANSYS%20Forte%20Simulate%20Guide.pdf?sequence=1&isAllowed=y
[30] Oleg Zikanov, Essential Computational fluid Dynamics, 2nd ed., John Wiley Sons, 2019.
[Google Scholar] [Publisher Link]
[31] B.B. Sahoo, N. Sahoo, and U.K. Saha, “Effect of Engine Parameters and Type of Gaseous Fuel on the Performance of Dual-Fuel Gas Diesel Engines—A Critical Review,” Renewable and Sustainable Energy Reviews, vol. 13, no. 6-7, pp. 1151-1184, 2009.
[CrossRef] [Google Scholar] [Publisher Link]
[32] Vipin Mehta, Sanjay Kateray, and P.L. Verma, “Calculation Analysis of Heat Transfer on the Surface of Engine Cylinders with Unequal Size of Material and Expanded Surfaces,” SSRG International Journal of Mechanical Engineering, vol. 9, no. 2, pp. 1-8, 2022.
[CrossRef] [Publisher Link]
[33] Ali Jafari, and Siamak Kazemzadeh Hannani, “Effect of Fuel and Engine Operational Characteristics on the Heat Loss from Combustion Chamber Surfaces of SI Engines,” International Communications in Heat and Mass Transfer, vol. 33, no. 1, pp. 122–134, 2006.
[CrossRef] [Google Scholar] [Publisher Link]
[34] Elisa Carvajal Trujillo et al., “Methodology for the Estimation of Cylinder Inner Surface Temperature in an Air-Cooled Engine,” Applied Thermal Engineering, vol. 31, pp. 1474–1481, 2011.
[CrossRef] [Publisher Link]
[35] Magnus Sjoberg, and John E. Dec, “Effects of Engine Speed, Fueling Rate and Combustion Phasing on the Thermal Stratification Required to Limit HCCI Knocking Intensity,” SAE Transactions, vol. 114, pp. 1472-1486, 2005.
[Google Scholar] [Publisher Link]
[36] B. Murali Krishna, and J.M. Mallikarjuna, “Effect of Engine Speed on In-Cylinder Tumble Flows in A Motored Internal Combustion Engine-an Experimental Investigation using Particule Image Velocimetry,” Journal of Applied Fluid Mechanics, vol. 4, no. 1, pp. 1-14, 2011.
[CrossRef] [Google Scholar] [Publisher Link]
[37] Magnus Sjoberg, and John E. Dec, “Combined Effect of Fuel-Type and Engine Speed on Intake Temperature Requirements and Completeness of Bulk-Gas Reactions for HCCI Combustion,” SAE Technical Paper, 2003.
[CrossRef] [Google Scholar] [Publisher Link]
[38] Cheolwoong Park et al., “The Effect of Engine Speed and Cylinder-to-Cylinder Variations on Backfire in a Hydrogen-Fueled Internal Combustion Engine,” International Journal of Hydrogen Energy, vol. 44, no. 39, pp. 22223-22230, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[39] Harsk Goyal, Sanghoon Kook, and Evatt Hawkes, “Influence of Engine Speed on Gasoline Compression Ignition (GCI) Combustion in a Single-Cylinder Light-Duty Diesel Engine,” SAE Technical Paper, 2017.
[CrossRef] [Google Scholar] [Publisher Link]
[40] Taehoon Kim, Jingeum Song, and Parc Sunwook, “Effects of Turbulence Enhancement on Combustion Process using a Double Injection Strategy in Direct Injection Spark-Ignition Gasoline Engine,” International Journal of Heat and Fluid Flow, vol. 566, pp. 124-136, 2015.
[CrossRef] [Google Scholar] [Publisher Link]
[41] Song-Charng Kong et al., “Modeling the Effects of Geometry Generated Turbulence on HCCI Engine Combustion,” SAE Transaction, vol. 112, pp. 1511-1521, 2003.
[CrossRef] [Google Scholar] [Publisher Link]