低压高过冷度下自然循环流动不稳定性实验研究

王强; 高璞珍; 王忠乙; 陈先兵; 黄莹

doi:10.7538/yzk.2017.youxian.0602

低压高过冷度下自然循环流动不稳定性实验研究

哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001

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- 刊出日期: 2018-05-19

Experimental Investigation on Flow Instability under Low Pressure and High Subcooling Natural Circulation Conditions

Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University, Harbin 150001, China

摘要

摘要: 对具有长直上升段的自然循环系统，开展了流动不稳定性实验研究。同时，详细分析了低压、高入口过冷度条件下典型的流动不稳定现象。实验表明：自然循环系统的结构、流体的热边界条件会影响自然循环的运行特性及流动不稳定性类型。较高入口过冷度下，高热流密度导致系统脱离稳态后，很难重新回到稳定的两相自然循环流动状态。随着热流密度的提高，系统会经历间歇沸腾、复合动态流动不稳定性等状态。依据实验结果得到了高入口过冷度下的不稳定性边界图。在两相振荡期间，自然循环驱动压头和回路阻力的主要影响因素集中在长直上升段和加热段。加热段出口积聚的大量气泡对上、下游流体的强烈挤压作用是流量大幅振荡及逆流的主要原因。
- 自然循环 ,
- 流动不稳定性 ,
- 高入口过冷度 ,
- 间歇泉
Abstract: An experimental investigation of flow instability in a natural circulation system with long and straight riser was carried out. Meanwhile, a series of typical flow instabilities under low pressure and high inlet subcooling conditions were analyzed in detail. The experiment results show that natural circulation characteristics and flow instability type are affected by the structure and thermal boundary of fluid. Under high inlet subcooling condition, the system could hardly return to two-phase stable state if heat flux exceeds a critical value. With the increase of heat flux, geysering flow instability and compound dynamic instability occur in natural circulation system. According to the experiment data, instability boundary map under high subcooling condition is obtained. Natural circulation driving pressure head and resistance pressure head are strongly affected by the thermal-hydraulic state in heated channel and adiabatic riser. The accumulation of massive bubbles which triggers periodic local high pressure is the primary reason of large oscillation and flow reversal.
- natural circulation ,
- flow instability ,
- high inlet subcooling ,
- geysering

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参考文献(19)

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低压高过冷度下自然循环流动不稳定性实验研究

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Experimental Investigation on Flow Instability under Low Pressure and High Subcooling Natural Circulation Conditions

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