One of the several losses of a combustion chamber is the gas leakage toward the crankcase due to imperfect sealing of the rings. It is commonly known as blow by and it affects efficiency and emissions. The paper initially describes a bibliographic review of the phenomenon, together with the equations of the system. A typical piston ring pack for internal combustion engine is proposed to be analysed and solved using ©Ricardo RINGPAK Solver. A specific issue such as Bore distortion orders were used to investigate the sealing capacity of the ring-pack in terms of ring dynamics, inter-ring pressures and mass flows. Bore distortion orders and their magnitude showed to affect the ring pack behavior. Order zero distortion resulted to be the most important order due to the highest amount of gas lost in the crankcase, while orders three and four resulted to generate high blow-by values, even if their magnitude of distortion is lower in comparison to other orders.

Cylinder liner deformation orders and efficiency of a piston ring-pack / Selmani, Erjon; Delprete, Cristiana; Bisha, Arian. - ELETTRONICO. - 95:(2019), pp. 1-7. ((Intervento presentato al convegno The 3rd International Conference on Power, Energy and Mechanical Engineering (ICPEME 2019) tenutosi a Prague, CZ nel 16-19 February 2019 [10.1051/e3sconf/20199504001].

Cylinder liner deformation orders and efficiency of a piston ring-pack

Cristiana Delprete;
2019

Abstract

One of the several losses of a combustion chamber is the gas leakage toward the crankcase due to imperfect sealing of the rings. It is commonly known as blow by and it affects efficiency and emissions. The paper initially describes a bibliographic review of the phenomenon, together with the equations of the system. A typical piston ring pack for internal combustion engine is proposed to be analysed and solved using ©Ricardo RINGPAK Solver. A specific issue such as Bore distortion orders were used to investigate the sealing capacity of the ring-pack in terms of ring dynamics, inter-ring pressures and mass flows. Bore distortion orders and their magnitude showed to affect the ring pack behavior. Order zero distortion resulted to be the most important order due to the highest amount of gas lost in the crankcase, while orders three and four resulted to generate high blow-by values, even if their magnitude of distortion is lower in comparison to other orders.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2785192