Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
Steam-water separation technology has a wide range of applications in energy, environment, chemical industry etc. In the nuclear energy field, the steam separator plays an important role in supplying steam to turbines and the study of the mechanism of steam-water separation devices is very significant for the safe and efficient use of nuclear energy. Experimental studies on steam-water separation are usually relatively macroscopic, making it difficult to obtain microscopic information about droplet motion, collisions, etc. In terms of numerical simulations, there are mainly two types of methods including the Euler-Euler methods and Euler-Lagrange methods, the Euler-Euler method cannot obtain detailed information about the droplet motion, while the computational effort of the traditional Euler-Lagrange method increases with the time step, and the droplet motion information of the full field is cannot be directly obtained. Thus, the Euler grid approximation model is established and the analysis of single droplets is performed based on the Euler grid approximation algorithm, but only the motion of droplets in a single direction is simulated, and the calculated results of droplets moving in different directions cannot be obtained. Therefore, based on the explanation of the physical mechanism of droplet motion in the water vapor separation device as well as the single droplet motion model of Euler grid approximation method, this paper gives the physical mechanism explanation and mathematical expressions of the Euler grid approximation model for different calculation directions of droplets, analyzes the relationship between droplet accumulation and the droplet velocity in different motion directions, studies and gives the velocity and density fields of multi-droplet motion. The accuracy of the droplet field calculation is verified by comparison with the Euler-Lagrange method and can be improved with the grid encryption, and the applicability of the Euler grid approximation method is extended to multi-droplet fields.
