Study on calculation of pressure wave speed with fluid-structure interaction in assembled pipelines

Taking the assembled pipeline as research object, the deformation of sealing rubber ring was analyzed under water hammer pressure. A calculation method of pressure wave speed with fluid-structure interaction (FSI) in assembled pipeline was proposed. The influences of sealing rubber ring on pressure wave speed were researched. The computational results show that the attenuation effect of sealing rubber ring on pressure wave speed with FSI is less than that of pressure wave speed without FSI. The attenuation ratio of sealing rubber ring to pressure wave speed enhances with the increase of the bulk modulus of the transmission medium in assembled pipeline. Owing to the influence of sealing rubber ring, pressure wave speed reflects a trend of rise first and then fall as the ratio between the thickness of pipe wall and the inner diameter of pipe increases.