Author/Authors :
Moradi Cheqamahi J. نويسنده Department of Mechanical Engineering - Isfahan University of Technology , Nili-Ahmadabadi M. نويسنده Department of Mechanical Engineering - Isfahan University of Technology , Akbarzadeh S. نويسنده Department of Mechanical Engineering - Isfahan University of Technology , Saghafian M. نويسنده Department of Mechanical Engineering - Isfahan University of Technology
Abstract :
Journal bearings are widely used in different machineries. Reynolds equation is the governing equation to
predict pressure distribution and load bearing capacity in journal bearings. There are many analytical and
numerical methods for solving this equation. The main disadvantage of these methods is their inability to
analyze complex geometries. In this paper, a comprehensive method based on dynamic mesh method is
developed to solve the conservation equations of mass, momentum and energy. This method has smaller error
compared to other techniques. To verify the accuracy of this method, the bearings with different length to
diameter ratios are analytically and numerically analyzed under different loads and compared with each other.
In continue, the turbocharger’s bearing is numerically simulated and the effects of rotational speed change are
studied. Finally, the turbocharger’s bearing with four axial grooves are simulated. The simulations results
show that adding grooves to the turbocharger’s bearing causes the bearing eccentricity ratio and lubricant
flow rate to increase and the attitude angle, rate of temperature rise and frictional torque to decrease.
