Numerical model to study the valve overlap period in the Wärtsilä 6L 46 four-stroke marine engine

• Autorzy: Lamas M. I. , Rodríguez C. G. , Rebollido J. M.
• Języki publikacji: EN

Abstrakty

EN

In this paper, a CFD (Computational Fluid Dynamics) analysis was carried out to study the Wärtsilä 6L 46 medium-speed, four-stroke marine engine. For the purpose, the commercial software ANSYS Fluent 6.3 was employed. The aim is to analyze the scavenging of gases, especially during the valve overlap period. Particularly, the pressure, velocity and mass fraction fields were numerically obtained. In order to validate the CFD results, the in-cylinder pressure was successfully compared to experimental measurements for the exhaust, intake and compression strokes of the cylinder operation. This model can be used in future works to improve the performance of these engines because the information provided is very useful to identify regions in which the pressure, velocity or distribution of gases are inadequate. Besides, to compute the quantity of burnt gases which remain inside the cylinder, fresh charge which is expelled through the exhaust valves and study the influence of parameters such as the exhaust and intake pressures, engine speed, cam profile design, etc.

Słowa kluczowe

EN

four-stroke engine; computational fluid dynamics CFD; marine engine

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2012
• Tom: nr 1
• Strony: 31--37
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Lamas M. I.

autor

Rodríguez C. G.

autor

Rebollido J. M.

• Escola Universitaria Politécnica. Universidade da Coruńa. Avda. 19 de Febreiro s/n - 15405 Ferrol - A Coruńa. SPAIN,

Bibliografia

• 1. Woodyard, D.: Pounder´s marine diesel engines and gas turbines. 8th Edition. Amsterdan. Elsevier 2004.
• 2. Milton, B.E.; Behnia, M.; Ellerman, D.M.: Fuel deposition and re-atomization from fuel/air flows through engine inlet valves. International Journal of Heat and Fluid Flow, vol. 22, pp. 350- 357, 2001.
• 3. Payri F.; Benajes J.; Margot X.; Gil, A.: CFD modeling of the in-cylinder flow in direct-injection diesel engines. Computers & Fluids, vol.33 p.995-1021, 2004.
• 4. Moureau, V.; Angelberger, C.: Towards large eddy simulation in internal combustion engines: simulation of a compressed tumble flow. SAE Paper 011995, 2004.
• 5. Huang, R.F.; Huang, C.W.; Chang, S.B.; Yang, H.S.; Lin, T.W.; Hsu, W.Y.: Topological flow evolutions in cylinder of a motored engine during intake and compression strokes. Journal of Fluids and Structures, vol. 20, pp. 105-127, 2005.
• 6. Yang, S.L.; Siow, Y.K.; Teo, C.Y.: A Kiva code with Reynoldsstress model for engine flow simulation. Journal of Energy Conversion, vol. 30, pp. 427-445, 2005.
• 7. Semin; Idris, A.; Bakar, R.A.: Effect of port injection CNG engine using injector nozzle multi holes on air-fuel mixing in combustion chamber. European Journal of Scientific Research, vol. 34, pp. 16-24, 2009.
• 8. Ramajo, D. E.; Nigro, N. M.: In-cylinder flow CFD analysis of a tour-valve spark ignition engine: comparison between steady and dynamic tests. Journal of Engineering for Gas Turbines and Power, vol. 132, 2010.
• 9. Lamas, M.I.; Rodríguez, C.G.: CFD analysis of the scavenging process in the MAN B&W 7S50MC two-stroke diesel marine engine. Submitted to Journal of Ship Research.
• 10. Nakagawa, H.; Kato, S.; Tateishi, M., Adachi, T., Nakashima, M.: Airflow in the cylinder of a 2-stroke cycle uniflow scavenging diesel engine during compression stroke, JSME International Journal, series II, vol. 33, No. 3, pp. 591-598, 1990.
• 11. Wärtsilä 46. Project guide for marine applications. 2001.
• 12. Fluent 6.3 Documentation, 2006. Fluent Inc.
• 13. Versteeg H K, Malalasekera W.: An introduction to computational fluid dynamics: the finite volume method. 2nd Edition. Harlow: Pearson Education, 2007.