Artavazd M. Sujyan, Maria A. Berberova, Rodion A. Zheleznyakov, Artur A. Khachatryan, Aleksei Yu. Lazarev, Radzhab I. Magomedov, Vladimir M. Yudin

Kurchatov institute, MIREA – Russian Technological University,

The paper presents a methodology used to create a one-dimensional model of thermal-hydraulics in a single heated channel with supercritical water. This model can be used to solve the problem of determining the boundaries of thermal-hydraulic stability. The technique is based on the principles laid down in the semi-implicit SIMPLE algorithm. The model includes equations of mass, momentum and energy conservation, taking into account the compressibility of the fluid. The model is implemented using in-house C++ program code. The IAPWS-IF97 library, implemented in the high-speed seuif97 package, was used to determine thermophysical properties of water. There are several correlations in the program to calculate the coefficient of hydraulic resistance, but the Blasius formula is selected for testing the model. The presented methodology involves solution of the basic thermal hydraulics equations with checking the continuity of the flow four times per one time step. The continuity cycle ends when a mass imbalance of 10-6 is reached, or when 10 iterations are reached. The results of testing the model are demonstrated.

thermal-hydraulic model, supercritical parameters, heated channel, SIMPLE algorithm, compressibility of fluid, thermal-hydraulic stability