Abstract
The forces acting on the orbiting scroll under the actual operating conditions have not yet been studied sufficiently, while theoretical analysis about forces acting on the orbiting scroll and fixed scroll wraps have been made. In this study, first the acting forces on the orbiting scroll are calculated from the indicator diagram and compared with the theoretical prediction results where no internal leakage between scroll wraps is assumed. It is found that the magnitude of the force from the indicator diagram agrees with the theoretical one within several percent error, although the crank angle position of the maximum force obtained from the indicator diagram lies several ten degrees behind the theoretical discharge starting position. Second, axial displacement of the orbiting scroll is calculated based on the forces from the indicator diagram, and compared with the measured data. The comparison results are found to be acceptable.
