Abstract
In this study, a transient flow in a spool valve has been studied via numerical analysis. First, a numerical procedure is developed for non-uniform grid systems. A consistent formulation of the QUICK scheme is derived for non-uniform rectangular grid systems. A transient flow field was then investigated for the condition with several values of the spool stroke and a large pressure difference between upstream and downstream boundaries. The computational result was used to obtain a mathematical model for the spool valve flow transient in high Reynolds number condition of practical importance. Unsteady characteristics of the axial flow force acting on the spool valve was investigated based on the pressure and shearing stress distribution of the computational result. Prediction of the unsteady flow force based on the momentum theory was examined using the computational result.
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