Abstract
Liquid metals have excellent thermal, nuclear physics, and high-density power properties that allow them to efficiently take heat out of the reactor. Based on the data of Natrium, Natrium-Kalium, Plumbum and Plumbum-Bismuth simulated by CFX software, the three factors of heating power, system pressure and inlet temperature were selected, and the analysis method of grey correlation model was used to analyze the correlation degree and weight of these factors to the heat transfer coefficient of different liquid metals. Through analysis, it can be concluded that: under Natrium, Plumbum and Plumbum-Bismuth working medium, the correlation degree and weight importance of heating power to heat transfer coefficient are greater than that of system pressure, while under NatriumKalium working medium, the correlation degree and weight of system pressure and heating power to heat transfer coefficient are roughly equal; The inlet temperature has the greatest correlation to the heat transfer coefficients of the four liquid metals, and the inlet temperature contributes the largest weight to the change in the heat transfer coefficient, that is, the inlet temperature and the heat transfer coefficient are most closely related; When the resolution is 0.01, the correlation degree ofthe heat transfer coefficient can be clearly distinguished between these three factors. Through the analysis of the degree of correlation and the weight of the influencing factors of different liquid metal heat transfer coefficients, it is helpful to discover the unstable factors that cause the deterioration of liquid metal heat transfer, and it is of great significance to the choice of new reactor coolants.
