Oil Consumption and Blowby of Truck Diesel Engines-Test Bench Results

Ellermann, Jürgen; Röhrle, Manfred D.; Schelling, Herbert

doi:10.4271/810937

Cited by 12 publications

(1 citation statement)

References 2 publications

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“…[1] is given a historic review of piston ring technology. The standard solution for the majority of the applications is a threering pack, made by two-compression rings ad one oil-ring [2], however in literature different solutions have also been proposed [3]. In order to compensate the thermal expansion in axial direction, ring axial width is smaller than the respective groove height.…”

Section: Ring Dynamics and Gas Flowmentioning

confidence: 99%

Simulation of the cylinder bore distortion and effect on the sealing capacity of the ringpack

2019

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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. One important factor affecting it is the distorted cylinder bore. The paper describes the equations that rule the blow-by phenomenon in terms of ring and gas dynamics, subsequently, the bore distortion of the cylinder was obtained and its orders calculated through Fourier series. The ringpack capacity in the distorted bore cylinder was then analysed using ©Ricardo RINGPAK Solver. Order zero distortion resulted to be the most important order due to the highest amount of gas lost in the crankcase. Orders one and two didn't showed significant differences from the non-distorted bore case, while orders three and four resulted in high blow-by values, even if their magnitude of distortion was lower in comparison to other orders. The ring pack behavior showed to be affected by bore distortion and its magnitude, however, the blow by phenomenon showed to depend also on other factors in a complex manner.

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Section: Ring Dynamics and Gas Flowmentioning

confidence: 99%