OPTIMUM STEP DESIGN FOR CENTERING OF PISTONS MOVING IN AN INCOMPRESSIBLE FLUID

摘要

Hydrodynamic effects are analyzed for a stepped piston moving within a tight-clearance tube filled with an incompressible fluid. Together with the hydrostatic effects that were analyzed in an earlier paper, a complete solution is obtained and an optimum step design for centering of the piston is suggested. The axial speed resulting from an axial driving force is calculated, and some experimental results for pistons falling in a water-filled tube are presented.