Study on Effect of Piston Bowl Depth on Intake Air Flow Behavior using Ansys Fluent Cold Flow
Main Article Content
Abstract
Gas flow behaviour is an extremely complicated question on internal combustion engine and plays a key role in air-fuel mixing performance. A proper mixture process significantly improves the combustion performance and thus enhances the engine efficiency. This study estimates the effect of different piston bowl depths on the flow field development inside the combustion chamber of a CNG engine using Ansys Fluent. The cold flow model was utilized without considering the combustion behaviour. The three-dimensional model was developed based on a single cylinder CNG converted engine. Four different bowl heights were applied while the compression ratio was maintained as the designed value of 10. The tumble and swirl as well as the turbulent flow pattern were investigated to consider the gas flow behaviour. The simulation results indicate that the tumble and swirl ratio increase with increasing of piston bowl depth. The case of bowl height 17 mm shows better flow behaviour and higher velocity for a good mixing performance as well as turbulence dissipation.
Keywords
Single cylinder CNG engine, piston bowl depth, tumble ratio, swirl ratio, turbulent kinetic energy (TKE)
Article Details
References
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gas as an alternative fuel for internal combustion
engines. Am. J. Eng. Appl. Sci. 2008;1(4):302-11,
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converted CNG engine by varying piston bowl
geometry: A case study, J Air Waste Manag Assoc, 72
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L. Yu, D. Li, Study on combustion and emissions of a
combined injection spark ignition engine with natural
gas direct injection plus ethanol port injection under
lean-burn conditions, ACS Omega, 7 (2022) 21901-
21911.
https://doi.org/10.1021/acsomega.2c02154
[6] M. Garg, R. Ravikrishna, In-cylinder flow and
combustion modeling of a CNG-fuelled stratified
charge engine, Applied Thermal Engineering, 149
(2019) 425-438.
https://doi.org/10.1016/j.applthermaleng.2018.12.036
[7] W. Qin, M. Xie, M. Jia, T. Wang, D. Liu, Large eddy
simulation of in-cylinder turbulent flows in a DISI
gasoline engine, Applied Mathematical Modelling, 38
(2014) 5967-5985,
https://doi.org/10.1016/j.apm.2014.05.004
[8] C. Garth, R.S. Laramee, X. Tricoche, J. Schneider,
H. Hagen, Extraction and visualization of swirl and
tumble motion from engine simulation data, Topologybased Methods in Visualization, Springer, 2007, pp.
121-135,
https://doi.org/10.1007/978-3-540-70823-0_9
[9] S. Subramanian, B. Rathinam, J. I. J. Lalvani,
K. Annamalai, Piston bowl optimization for single
cylinder diesel engine using CFD, SAE Technical
Paper, 2016,
https://doi.org/10.4271/2016-28-0107
[10] S. Gugulothu, K. Reddy, CFD simulation of incylinder flow on different piston bowl geometries in a
DI diesel engine, Journal of Applied Fluid Mechanics,
9 (2016) 1147-1155,
https://doi.org/10.18869/acadpub.jafm.68.228.24397
[11] B. Harshavardhan, J. Mallikarjuna, CFD analysis of incylinder flow and air-fuel interaction on different
combustion chamber geometry in DISI engine,
International Journal on Theoretical and Applied
Research in Mechanical Engineering (IJTARME), 2
(2013) 104-108.
[12] M. M. Pargaonkar, V. Jumbad, CFD analysis of piston
bowl geometry for CI direct injection engine, Int. Res.
J. Eng. Technol., 5 (2018) 567-572.
[13] Mohammadi, B. and Pironneau, O., 1993. Analysis of
the k-epsilon turbulence model.
[14] S. V. Le, H. H. Chan, T. D. Quoc, A study on the effect
of compression ratio and bowl-in-piston geometry on
knock limit in port injection natural gas converted
engine, The AUN/SEED-Net Joint Regional
Conference in Transportation, Energy, and Mechanical
Manufacturing Engineering, Springer Nature
Singapore, Singapore, 2022, pp. 56-73.
https://doi.org/10.1007/978-981-19-1968-8_6