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CFD Analysis of a Two-Stroke Air Cooled Engine Designed for Handheld Products
Technical Paper
2014-32-0006
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Still today, two-stroke engine layout is characterized by a wide share on the market thanks to its simpler construction that allows to reduce production and maintenance costs respecting the four-stroke engine.
Two of the main application areas for the two-stroke engines are on small motorbikes and on handheld machines like chainsaws, brush cutters, and blowers. In both these application areas, two-stroke engines are generally equipped by a carburettor to provide the air/fuel mixture formation while the engine cooling is assured by forcing an air stream all around the engine head and cylinder surfaces.
Focusing the attention on the two-stroke air-cooling system, it is not easy to assure its effectiveness all around the cylinder surface because the air flow easily separates from the cylinder walls producing local hot-spots on the cylinder itself. This problem can be bounded only by the optimization of the cylinder fin design placed externally to the cylinder surface.
In the present paper the authors present a first analysis of the thermal-flow behaviour of a two stroke engine designed for brush-cutter machine applications. The optimization of the air-cooling system of such a machine is a very challenging task because the machine design is very compact forcing all the engine parts to remain quite close to each other.
The proposed analysis is performed by the definition of a specific 3D-CFD simulation methodology based on the Conjugated Heat Transfer approach. The methodology was validated against experimental data.
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Citation
Brusiani, F., Bianchi, G., Catellani, C., Ferrari, M. et al., "CFD Analysis of a Two-Stroke Air Cooled Engine Designed for Handheld Products," SAE Technical Paper 2014-32-0006, 2014, https://doi.org/10.4271/2014-32-0006.Also In
References
- Yoshida , M. , Ishihara , S. , Murakami , Y. , Nakashima , K. et al. Optimum Fin Layout of Air-Cooled Engine Cylinder in Air Stream SAE Technical Paper 2006-01-1229 2006 10.4271/2006-01-1229
- Nakashima , K. , Fujiyoshi , M. , Ishihara , S. , Murakami , Y. et al. Cooling Effects of Air-Cooled Finned Cylinder Utilizing Contracted Flow SAE Technical Paper 2009-01-0176 2009 10.4271/2009-01-0176
- Nakashima , K. , Teramoto , S. , Murakami , Y. , Ishihara , S. et al. Improving Cylinder Cooling Using Tapered Fins and Baffle Plates between Fins in Air-Cooled Engines SAE Technical Paper 2010-01-0323 2010 10.4271/2010-01-0323
- Ishihara , S. , Murakami , Y. , Nakashima , K. , Yamamoto , M. et al. Improvement of Cylinder Cooling in Air-Cooled Engines by Utilizing Baffle Plates SAE Technical Paper 2007-01-0546 2007 10.4271/2007-01-0546
- Thornhill , D. and May , A. An Experimental Investigation into the Cooling of Finned Metal Cylinders, in a Free Air Stream SAE Technical Paper 1999-01-3307 1999 10.4271/1999-01-3307
- Yoshida , M. , Ishihara , S. , Nakashima , K. , and Yamamoto , M. Development of Air-Cooled Cylinder by Utilizing Natural Convection SAE Technical Paper 2005-01-1385 2005 10.4271/2005-01-1385
- Thornhill , D. , Graham , A. , Cunnigham , G. , Troxler , P. et al. Experimental Investigation into the Free Air-Cooling of Air-Cooled Cylinders SAE Technical Paper 2003-32-0034 2003 10.4271/2003-32-0034
- Franco , A. and Martorano , L. Evaluations on the Heat Transfer in the Small Two-stroke Engines SAE Technical Paper 980762 1998 10.4271/980762
- Radwan , M. and Shahin , M. The Effect of Cowling on the Local Cooling Effectiveness of Engine Air-Cooled Cylinders SAE Technical Paper 920790 1992 10.4271/920790
- Biermann , A. E. and Ellerbrock , H. H. The Design of Fins for Air-Cooled Cylinders NACA Report No. 726 1941
- Biermann , A. E. and Pinkel , B. Heat Transfer from Finned Metal Cylinders in an Air Stream NACA Report No. 488 1935
- StarCCM+ v8 User Manual CD-Adapco 2013
- Versteeg , H.K. , Malalasekera , W. An Introduction to Computational Fluid Dynamics: The Finite Volume Method 2nd Longman 2006