TRANSIENT FLOWS AND PRESSURE WAVES IN PIPES  

作　　者：Wang, Xiuqing  Sun, J.G.  Sha, W.T. 

机构地区：[1] Nuclear Industry Management Inst, Beijing, China

出　　处：《Journal of Hydrodynamics》1995年第2期51-59,共9页水动力学研究与进展B辑（英文版）

摘　　要：Transient laminar flows and pressure-wave propagation in pipes, commonly called as water hammer, have been analyzed. A pressure-wave equation and a linearized velocity equation were derived from the equations of mass and momentum conservation. The waveform distortion due to viscous dissipation and elastic expansion of pipe wall was characterized by a dimensionless transmission number. The damping coefficients of pressure waves were found to be related to the roots of Bessel function. An exact solution of pressure-wave equation was obtained numerically. The relationship between the distortion of a traveling wave and transmission number was studied. The problem was also calculated with a general-purpose computer code, COMMIX, which solves exact mass conservation equation and Navier-Stokes equations. The computational results of the COMMIX code agreed well with the analytical solutions.Transient laminar flows and pressure-wave propagation in pipes, commonly called as water hammer, have been analyzed. A pressure-wave equation and a linearized velocity equation were derived from the equations of mass and momentum conservation. The waveform distortion due to viscous dissipation and elastic expansion of pipe wall was characterized by a dimensionless transmission number. The damping coefficients of pressure waves were found to be related to the roots of Bessel function. An exact solution of pressure-wave equation was obtained numerically. The relationship between the distortion of a traveling wave and transmission number was studied. The problem was also calculated with a general-purpose computer code, COMMIX, which solves exact mass conservation equation and Navier-Stokes equations. The computational results of the COMMIX code agreed well with the analytical solutions.

关 键 词：Computer simulation Differential equations Pipe flow Water wave effects 

分 类 号：O353.1[理学—流体力学]