The rate of wear of piston grooves on the piston is mainly a function of the peak cylinder pressure, hardness, surface roughness, depth of penetration and the number of hard particles produced by combustion or entering past the air filter. The problem of wear becomes severe as the blowby past the rings and oil consumption of the engine increases in diesel engines. In this paper, an attempt is made to estimate the wear of piston grooves quantitatively. The wear rate is correlated with the product of gaseous load, amount of hard particles past the piston lands, radius of abrasive particles, and inversely with hardness of the groove surface. Under abnormal conditions, the shear strain due to friction exceeds the plasticity limit of the material and superficial delamination occurs at the groove surface. The model was validated on a large bore engine running on heavy fuel at 22-bar bmep and the abrasive wear predicted by other earlier models are discussed [7].

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