Quasi-One-Dimensional Unsteady-Flow Procedure for Real Fluids

摘要

The numerical solution techniques, including explicit, point-implicit, and fully implicit schemes, used in a new quasi-one-dimensional procedure for the transient solution of real-fluid flows in system lines and volumes are presented. The procedure is coupled with a real-fluid properties database so that both compressible and incompressible fluids may be considered using the same code. The procedure was implemented in Matlab/Simulink and Fortran95 to allow for application on a wide variety of computer platforms. The computational efficiency of the various numerical methods is discussed to aid in selection of specific applications. Results for the transient flows of gaseous nitrogen and water in a simple pipe network are presented to demonstrate the capability of the current techniques and the unsteady-flow physics that can occur in system lines.