Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
The Reynolds equation that can obtain pressure distribution and shear stress of oil film by giving velocity distribution and boundary condition to Navier-Stokes equation. Up to date, the Reynolds equation has been modified by many researchers. For example, equations that take turbulence lubrication and cavitation into account were derived. However, the velocity distribution assumed in the Reynolds equation has not been confirmed by visualization. On the other hand, cavitation occurs due to the negative pressure at the widening portion of the clearance of the journal oil film bearing. There are boundary conditions assuming a multiphase state in order to take account of the influence of this cavitation. However, this cavitation is likewise not visualized. Therefore, in this study, visualization of the oil film in fluid lubrication state, visualization of velocity distribution and cavitation in the oil film was performed. As a result, the velocity distribution of the oil film could be visualized. Furthermore, in the visualization of cavitation, it is shown that the curvature of cavitation increases as the load increases.