摘要
螺旋管式直流蒸汽发生器凭借结构紧凑、换热高效的性能优势,在先进小型反应堆中应用广泛。但对于并联螺旋管通道内流动不稳定现象目前尚未形成一致性的结论。通过试验研究了三种不同螺旋直径的并联螺旋管通道内流动不稳定现象,分析了质量流量、压力、入口过冷度和螺旋直径对流动不稳定现象的影响。结果表明:低压、低流速状态均不利于系统稳定;在低压低流量低入口过冷度工况下,入口过冷度的变化对临界热负荷影响较小;系统稳定边界在高压条件下可能呈现“S”形,在低压呈现“L”形;管内质量流速越高,流动不稳定的流量振荡周期越短,质量流速较低时,压力越高,振荡周期越短;基于试验数据,拟合了系统稳定边界预测关系式。此外,建模分析了直管传热与阻力模型对并联螺旋管通道稳定边界的预测效果,发现直管模型对临界热负荷的预测值高出试验值31.1%~69.9%。本文内容填补了并联螺旋管内流动不稳定性试验数据空缺,为流动不稳定现象的深入分析提供数据支撑。
[Background]Helical tube once-through steam generator is widely utilized in the design of advanced small reactors,forced circulation boiler and quench boiler.Flow instability is a critical thermal-hydraulic issue,but lack of comprehensive research on this phenomenon in parallel helical tubes.[Purpose]This study aims to conduct experiments on a helical tubes thermal-hydraulic apparatus.[Methods]The effects of thermal parameters were investigated at the pressure range of 7~13 MPa,mass flow rate ranger of 100~550 kg∙m−2∙s−1 and helical coil diameter range of 370~800 mm.The flow instability in parallel helical tube channels with three different helical diameters was experimentally studied,and the effects of mass flow rate,pressure,inlet subcooling and helical diameter on the flow instability were analyzed.Based on the test data,the prediction relationship of system stability boundary was fitted.Finally,the prediction effect of straight tube heat transfer and resistance model on the stable boundary of parallel spiral tube channel was analyzed.[Results]Experimental results show that high system pressure and high inlet flow rate contribute significantly to more stable system whilst inlet subcooling has a minimal impact on the critical load at conditions with low pressure,low flow rate and low inlet subcooling.The system stability boundary exhibits an"S"shape under high system pressure but transitions to an"L"shape under low system pressure,which is associated with the multivalued influence of inlet subcooling on system stability.It is found that the critical heat load predicted by the straight tube model is 31.1%~69.9%higher than the experimental value.[Conclusions]This study fills the gap in experimental data on flow instability in parallel helical tubes,providing a solid data foundation for in-depth analysis of flow instability phenomena in the helical tube once-through steam generator.
作者
郑雄
阮天鸣
胡艺嵩
高雅心
蒙舒祺
蔡德昌
毛玉龙
ZHENG Xiong;RUAN Tianming;HU Yisong;GAO Yaxin;MENG Shuqi;CAI Dechang;MAO Yulong(China Nuclear Power Technology Research Institute,Shenzhen 518000,China)
出处
《核技术》
北大核心
2025年第7期208-220,共13页
Nuclear Techniques
基金
广东省自然科学基金-面上项目(No.2023A1515012562)资助。
关键词
螺旋管
并联通道
流动不稳定性
临界热负荷
试验研究
Helical tubes
Parallel channel
Flow instability
Critical heat load
Experimental study
