ピストンリング油膜の動的挙動に関する研究 : 第1報,模擬装置による油膜破断領域の可視化

概要

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In order to verify the prediction concerning the conditions of oil film rupture and the phenomenon of transition between the separation boundary condition and the Reynolds' condition, the region of oil film rupture and the process of development of cavitation were visually observed using a test rig with a glass test piece (straight bar) as the piston ring and reciprocating flat plate as the cylinder liner. As a result, we found that cavities are formed at 20°〜30° crank angle from dead center (DC) in the rear, full film region where the negative pressure is predicted, and grow as the crank angle is increased. Then, a new series of cavities is formed at 50°〜60° from DC at the rear edge of the test piece. These two series of cavities then coalesce and the flow becomes turbulent momentarily, indicating that the pressure in the cavities forms at 20°〜30° after DC is negative and is released when the coalescence occurs.
一般社団法人日本機械学会の論文
1993-04-25