Development of New Simulation Technique Based on the “SMA” Method for Fluid Transients in Compound Pipeline Systems with Safety Valve

• Published in: Transactions of the Japan Society of Mechanical Engineers Series B Vol. 72; no. 721; pp. 2203 - 2210
• Main Authors: KOJIMA, Eiichi, YAMAZAKI, Toru, SHINADA, Masaaki
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 2006
• Subjects: Complex Pipeline; Compound Pipeline; Controlling Fluid Transients; Fluid Transients; Method of Characteristics; Modal Approximation; Water Hammer
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.72.2203

A new simulation technique called the “System Modal Approximation” method (SMA method for short) for fluid transients in compound pipeline systems has been proposed by the authors, which is able to predict fast and accurately, and superiority of this technique to other existing methods has been verified. There, however, detailed considerations have been limited to the cases where either of the pressure or flow-rate is known at every boundary. This paper presents the case study for enhancement of the analytical functions of the SMA method so as to be widely applicable to compound pipeline systems with various kinds of boundary conditions. Specifically, the calculation methods of time response of the wanted output variables at any points are newly proposed for the case whose boundary conditions are given by the time-variant non-linear relationship between pressure and flow-rate like a safety valve used for controlling fluid transients. For fluid transients produced in three kinds of compound pipeline systems with safety valve by the instantaneous valve closure, simulation results are compared with experimental results and then the usefulness of the generalized SMA method is verified.