A Study on the characteristics of the impact produced when the bubble on the crankshaft's main bearing ball collapses

Abstract

The impact produced when the bubble on the main bearing wall of an internal combustion engine is an important factor causing cavitation failure. Based on the average Reynolds equation of lubricating oil and the energy of cavitation collapse, the thermoelastic fluid dynamics (TEHD) model of the main bearing and the bubble collapse Volume of Fluid (VOF) model in the oil film attached to the bearing wall were established, the load and flow field distribution when the bubble collapses were analyzed, and the impact characteristics on the bearing wall when the bubble collapses were explored. The results show that: when the bubble collapses, it begins to sag from the top until it ruptures to form two bubbles; and within a very short period of time when the bubble collapses, the pressure of the top jet on the wall can reach 31MPa and above.