RESPONSE OF PNEUMATIC TRANSMISSION LINE WITH THE BEHAVIOUR OF MAGNETIC VALVE

Abstract

In this paper, the numerical solutions are presented which describe the pressure-time relationship that occurs at the end of a pneumatic transmission line following large pressure changes through the magnetic valve at its inlet. One dimensional continuity, momentum and energy equations describing the flow in a pneumatic transmission line have been solved numerically using the Runge-Kutta method for the inlet condition based on the flow rate through the valve. When the energy equation is used in them, the agreement between the experimental results and the numerical works is found to be dissatisfactory, because it is difficult to evaluate the wall shear stress and surface heat flux for the unsteady flow. If the flow is assumed to be barotropic, however, the calculated values for the isothermal flow show good agreement with the experimental results.