Research on Single-phase Inter-tube Pulsation Characteristics in Inverted U-tube of Steam Generator Based on Single-phase Compressible Model
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摘要: 单相工况下的管间脉动现象可使蒸汽发生器倒U型管内倒流现象提前发生，从而威胁其安全性。为探索单相管间脉动特性，基于单相可压缩模型，数值研究了管道长度、一次侧入口温度和压力、二次侧温度和换热系数对单相管间脉动临界流速的影响。结果表明，当管道长度较短时，管道长度的增加会使临界流速显著增加，且倒U型管越长，临界流速越大。一次侧入口温度和压力的增加均会使临界流速增加，使单相管间脉动更易发生。二次侧换热系数的升高会使单相管间脉动对应的临界流速降低。然而二次侧温度对临界流速的影响呈现非单值性，随着二次侧温度的升高，临界流速先升高后降低。Abstract: The inter-tube pulsation under single phase condition can make the backflow of inverted U-tube steam generator occur in advance, thus threatening its safety. In order to explore the inter-tube pulsation characteristics under single phase, based on the single-phase compressible model, the effects of tube length, primary side inlet temperature and pressure, secondary side temperature and heat transfer coefficient on the single-phase inter-tube pulsating critical velocity are studied numerically. The results show that when the tube length is short, the critical velocity increases significantly with the increase of tube length, and the longer the inverted U-tube is, the greater the critical velocity is. The increase of temperature and pressure at the inlet of the primary side will increase the critical velocity, making the single-phase inter-tube pulsation more likely to occur. The increase of the heat transfer coefficient on the secondary side will decrease the critical velocity corresponding to the single-phase inter-tube pulsation. However, the influence of the secondary side temperature on the critical velocity is non-single-valued. With the increase of the secondary side temperature, the critical velocity first increases and then decreases.
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图 1 倒U型管单相管间脉动计算模型
T1,out— 一次侧出口温度；p1,out— 一次侧出口压力
Figure 1. Calculation Model of Single-Phase Inter-Tube Pulsation of Inverted U-tube
图 4 管道长度对单相管间脉动临界流速的影响
Figure 4. Effect of Tube Length on Single-phase Inter-tube Pulsation Critical Velocity
图 5 一次侧入口温度对临界流速的影响
Figure 5. Effect of Primary Side Inlet Temperature on Critical Velocity
图 6 一次侧入口过冷度对脉动振幅的影响
Figure 6. Effect of Primary Side Inlet Subcooling on Pulsation Amplitude
图 7 一次侧入口压力对临界流速的影响
Figure 7. Effect of Primary Side Inlet Pressure on Critical Velocity
图 8 一次侧入口压力对单相管间脉动振幅的影响
Figure 8. Effect of Primary Side Inlet Pressure on Single-Phase Inter-Tube Pulsation Amplitude
图 9 二次侧温度对单相管间脉动临界流速的影响
Figure 9. Effect of Secondary Side Temperature on Single-Phase Inter-Tube Pulsation Critical Velocity
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