A New Numerical Model Used to Predict High-Frequent Transients in Liquid Pipeline Flow with More Accurate

High-frequent transients and steady flow in liquid pipelines have distinct flow characteristics. If the classic quasi-steady friction model is used in high-frequent transients in liquid pipelines, wall friction losses would be underestimated evidently. As a result, the key physical processes such as attenuation and phase shift of pressure traces in high-frequent transients could not be simulated exactly. In this paper, a new numerical model which has more accurate prediction of high-frequent transients in liquid pipe flow has been proposed and its numerical solution with the method of characteristics has been obtained. The corresponding calculation programs of the classic quasi-steady friction model and unsteady friction model have been developed and applied to transient simulation in an experimental pipeline. Compared to the results of measurements, the computational results of the unsteady friction model show more accurate and predominant than that of the classic quasi-steady friction model.