Contrast Analysis of Thermal-Hydraulic Qualities of Helical Tube Steam Generator between One and Two Dimensional Models

Based on the study of theoretical and experimental research on thermal-hydraulic qualities of fluid in helical tube steam generator in the world, two-dimensional model is proposed for generator used in high-temperature gas cooling reactor （HTR-10） in this paper, and the results are compared with experiment results and results from one-dimensional model. The equations in one-dimensional model are simple, and calculation is convenient, yet the empirical formula for helical tube, especially for small banding radius helical tube are not sufficient, and so modification based on the experiments is necessary. Fluid field can be simulated better on two-dimensional model, and the empirical formula for straight tube can be used directly, the calculation error are within 10%, and the effect of power and inlet throttle for system stable can be described by the results of dynamic program.