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首页> 外文期刊>Journal of Mechanical Science and Technology >Tube inlet orifice design of a once-through steam generator for flow stabilization
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Tube inlet orifice design of a once-through steam generator for flow stabilization

机译：管入口孔口设计一条通过蒸汽发生器，用于流动稳定

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摘要

A numerical study is conducted on the secondary side screw-type tube inlet orifice design of a once-through steam generator. An orifice length criterion for flow stabilization is derived by introducing the hydraulic resistance ratio of the orifice and the subcooled region to the two-phase and superheated regions. Various tube plugging conditions and power levels are considered, and the secondary coolant pressure at the tube outlet is adjusted to maintain a constant thermal power. Comprehensive numerical solutions are acquired to evaluate the minimum orifice length under various operating conditions. The results obtained show that a constant thermal power is maintained by properly adjusting the secondary coolant outlet pressure with a variation of the superheat degree and secondary coolant pressure drop when the steam generator operates at high power level. The steam generator performance is analyzed according to the tube plugging condition in terms of the degree of superheat, secondary side pressure drop, temperature distribution, and quality distribution. The secondary side outlet pressure curve for the constant thermal power operation is obtained, and the required minimum orifice length to suppress the flow oscillation below the allowable level is evaluated. The lowest power level results in the highest minimum orifice length, and non-plugging condition provides a limiting case for the orifice length criterion except near the 100 % power level.
机译：在一次通过蒸汽发生器的二次侧螺纹型管入口孔口设计上进行数值研究。通过将孔口和过冷区域的液压比率引入两相和过热区域来导出用于流动稳定的孔口长度标准。考虑各种管堵塞条件和功率水平，并且调节管出口处的二级冷却剂压力以保持恒定的热功率。获取综合数值解决方案以在各种操作条件下评估最小孔口长度。得到的结果表明，当蒸汽发生器在高功率水平下操作时，通过适当地调节二次冷却剂出口压力，通过适当地调节二次冷却剂出口压力和二次冷却剂压力下降的变化来保持恒定的热功率。根据管道堵塞条件，在过热程度，二次侧压降，温度分布和质量分布方面进行蒸汽发生器性能。获得用于恒定热功率操作的次级侧出口压力曲线，评价所需的最小孔口长度以抑制允许水平以下的流动振荡。最低功率电平导致最小的最小孔口长度，并且非堵塞条件为除了100％功率电平附近的孔口长度标准提供限制案例。

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