过热蒸汽管道喷雾冷却特性数值分析

To address the issues of insufficient cooling effectiveness and uneven post-cooling temperature distribution in steam pipelines, the discrete phase model for numerical simulations is employed in this study to investigate the effects of initial droplet diameter, cooling water flow rate, and number of nozzles on the cooling process. First, the validity of the numerical model was verified, and an orthogonal experimental design was established. Then, the influence of different parameters on temperature reduction, uniformity, and droplet evaporation rate was analyzed through range analysis. Finally, the impact of varying droplet diameters on evaporation and fragmentation phenomena was explored. The numerical results showed that for droplet diameters ranging from 50 μm to 200 μm, the evaporation rate initially decreased and then increased with the increase in diameter, influenced by drag-induced and wall-impact secondary fragmentation. For every increase of 439. 04 in the cooling water Reynolds number, the average temperature reduction increased by 2 K. The number of nozzles significantly affected temperature uniformity, with 2 nozzles, the distribution was most uneven. Optimal cooling performance was achieved with 4 nozzles, a cooling water Reynolds number of 4 443. 2, and a droplet diameter of 50 μm. This study provides a theoretical foundation for understanding spray cooling factors and selecting desuperheaters in engineering.