| Abstract: | In order to estimate the pressure load on a reactor structure during a blowdown, pressure variations in expansion waves propagating through a tube were numerically calculated and compared with experimental results. The expansion wave was divided into an inviscid main flow and a boundary-layer flow, and a coupled calculation was performed by using a finite difference method. The numerical results were in good agreement with the experimental results. The reduction of the effective cross-sectional area of the flow due to the development of the wall boundary layer was found to be important pertinent to the evaluation of the pressure variation in the expansion wave. |
