Numerical Analysis of In-Cylinder Flow in Internal Combustion Engines by LES Method

Document Type : Research Article

Authors

Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

Abstract

In this research, Large Eddy Simulation of in-cylinder flow during suction and compression stroke in an axisymmetric engine is performed. A computer code using Smogorinsky subgrid model is developed to solve the governing equations of the flow. A proper understanding of flow during suction and compression strokes, gives better information for fuel/air mixture and combustion. The results show that the advantage of LES model is the ability of computing turbulence characteristics in various crank angles of engine cycle. This advantage of model is highlighted by calculating RMS values of axial velocity in comparison with experimental ones. The results show that axial velocity fluctuations during intake reaches to a higher level than in compression stroke because of the inlet jet to the cylinder and intensive gradient of variables. In this regard, the flow in 100 degree ATDC during intake stroke reaches the maximum level of turbulence intensity and then turbulence generated during intake stroke decays rapidly. During intake stroke, three main vorticities are generated inside the cylinder. In the compression stroke these three vorticities are merged together to establish a new vorticity with direction of rotation opposite to the intake flow. Some smaller recirculating regions are also generated at  90 degree BTDC.

Highlights

[1] N. Mosleh, H.Khaleghi, Simulation of flow into the internal combustion engine using K-ε, MSc thesis, Tarbiat Modares University, Tehran, (1997).

[2] M. Fallah, Khaleghi, H, Calculations of flows in reciprocating engine chambers with AMS & K- ε, 1st International conference of computational methods in applied mathematics, Belarus, (2003).

[3] K. Naitoh, K. Kuwahara, Large eddy simulation and direct simulation of compressible turbulence and combusting flows in engines based on the BI-SCALES method, Fluid Dynamics Research, 10(4-6) (1992) 299-325.

[4] F. Bottone, A. Kronenburg, D. Gosman, A. Marquis, Large eddy simulation of diesel engine in-cylinder flow, Flow, turbulence and combustion, 88(1) (2012) 233-253.

[5] V. Huijnen, L. Somers, R. Baert, L. de Goey, C. Olbricht, A. Sadiki, J. Janicka, Study of turbulent flow structures of a practical steady engine head flow using large-eddy simulations, Journal of Fluids Engineering, 128(6) (2006) 1181-1191.

[6] R. Verzicco, J. Mohd-Yusof, P. Orlandi, D. Haworth, LES in complex geometries using boundary body forces, Center for Turbulence Research Proceedings of the Summer Program, NASA, Stanford University, (1998) 171-186.

[7] I. Celik, I. Yavuz, A. Smirnov, Large eddy simulations of in-cylinder turbulence for internal combustion engines: a review, International Journal of Engine Research, 2(2) (2001) 119-148.

[8] D. Haworth, Large-eddy simulation of in-cylinder flows, Oil & Gas Science and Technology, 54(2) (1999) 175- 185.

[9] I. Celik, I. Yavuz, A. Smirnov, J. Smith, E. Amin, A. Gel, Prediction of in-cylinder turbulence for IC engines, Combustion science and technology, 153(1) (2000) 339- 368.

[10] K. Liu, Large-eddy simulation of in-cylinder flows in motored reciprocating-piston internal combustion engines, The Pennsylvania State University, 2012.

[11] L. Davidson, Fluid mechanics, turbulent flow and turbulence modeling, Chalmers University of Technology, (2012).

[12] A. Yoshizawa, Statistical theory for compressible turbulent shear flows, with the application to subgrid modeling, The Physics of fluids, 29(7) (1986) 2152-2164.

[13] M. Khorramdel, Khaleghi, H, Investigation of in-cylinder flow in internal combustion engines by LES method, MSc thesis, Tarbiat Modares University, Tehran., (2014).

[14] M. Klein, An attempt to assess the quality of large eddy simulations in the context of implicit filtering, Flow, Turbulence and Combustion, 75(1) (2005) 131-147.

[15] M. Klein, J. Meyers, B.J. Geurts, Assessment of LES quality measures using the error landscape approach, in: Quality and Reliability of Large-Eddy Simulations, Springer, 2008, pp. 131-142.

[16] A.P. Morse, Turbulent flow measurement by laser-doppler anemometry in motored piston-cylinder assemblies, Transactions of the ASME., , Vol 101, (pp. 208–216.) (1979).

[17] A. Banaeizadeh, A. Afshari, H. Schock, F. Jaberi, Large-eddy simulations of turbulent flows in internal combustion engines, International Journal of Heat and Mass Transfer, 60 (2013) 781-796.

Keywords

References

[1] N. Mosleh, H.Khaleghi, Simulation of flow into the internal combustion engine using K-ε, MSc thesis, Tarbiat Modares University, Tehran, (1997).
[2] M. Fallah, Khaleghi, H, Calculations of flows in reciprocating engine chambers with AMS & K- ε, 1st International conference of computational methods in applied mathematics, Belarus, (2003).
[3] K. Naitoh, K. Kuwahara, Large eddy simulation and direct simulation of compressible turbulence and combusting flows in engines based on the BI-SCALES method, Fluid Dynamics Research, 10(4-6) (1992) 299-325.
[4] F. Bottone, A. Kronenburg, D. Gosman, A. Marquis, Large eddy simulation of diesel engine in-cylinder flow, Flow, turbulence and combustion, 88(1) (2012) 233-253.
[5] V. Huijnen, L. Somers, R. Baert, L. de Goey, C. Olbricht, A. Sadiki, J. Janicka, Study of turbulent flow structures of a practical steady engine head flow using large-eddy simulations, Journal of Fluids Engineering, 128(6) (2006) 1181-1191.
[6] R. Verzicco, J. Mohd-Yusof, P. Orlandi, D. Haworth, LES in complex geometries using boundary body forces, Center for Turbulence Research Proceedings of the Summer Program, NASA, Stanford University, (1998) 171-186.
[7] I. Celik, I. Yavuz, A. Smirnov, Large eddy simulations of in-cylinder turbulence for internal combustion engines: a review, International Journal of Engine Research, 2(2) (2001) 119-148.
[8] D. Haworth, Large-eddy simulation of in-cylinder flows, Oil & Gas Science and Technology, 54(2) (1999) 175- 185.
[9] I. Celik, I. Yavuz, A. Smirnov, J. Smith, E. Amin, A. Gel, Prediction of in-cylinder turbulence for IC engines, Combustion science and technology, 153(1) (2000) 339- 368.
[10] K. Liu, Large-eddy simulation of in-cylinder flows in motored reciprocating-piston internal combustion engines, The Pennsylvania State University, 2012.
[11] L. Davidson, Fluid mechanics, turbulent flow and turbulence modeling, Chalmers University of Technology, (2012).
[12] A. Yoshizawa, Statistical theory for compressible turbulent shear flows, with the application to subgrid modeling, The Physics of fluids, 29(7) (1986) 2152-2164.
[13] M. Khorramdel, Khaleghi, H, Investigation of in-cylinder flow in internal combustion engines by LES method, MSc thesis, Tarbiat Modares University, Tehran., (2014).
[14] M. Klein, An attempt to assess the quality of large eddy simulations in the context of implicit filtering, Flow, Turbulence and Combustion, 75(1) (2005) 131-147.
[15] M. Klein, J. Meyers, B.J. Geurts, Assessment of LES quality measures using the error landscape approach, in: Quality and Reliability of Large-Eddy Simulations, Springer, 2008, pp. 131-142.
[16] A.P. Morse, Turbulent flow measurement by laser-doppler anemometry in motored piston-cylinder assemblies, Transactions of the ASME., , Vol 101, (pp. 208–216.) (1979).
[17] A. Banaeizadeh, A. Afshari, H. Schock, F. Jaberi, Large-eddy simulations of turbulent flows in internal combustion engines, International Journal of Heat and Mass Transfer, 60 (2013) 781-796.
AUT Journal of Mechanical Engineering
Volume 1, Issue 1
June 2017
Pages 29-38

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