脉冲加热条件下垂直上升管内流动不稳定性研究
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摘要
脉冲释能是未来基于惯性约束聚变或聚变-裂变混合堆能源系统的固有特性,掌握脉冲加热条件下冷却剂流动不稳定基本特性及其关键影响因素,对新型脉冲能源系统的发展有着重要意义。本文对脉冲加热条件下的垂直上升管内流动不稳定进行了建模与数值模拟研究。研究结果表明随着脉冲热负荷的增加,管内会依次发生三种不同的流量脉动或流动不稳定现象,分别为过冷流动条件下微幅脉动、饱和蒸汽两相流动密度波不稳定以及出口过热条件下复合不稳定。研究还揭示了脉冲加热功率、脉冲周期、占空比等脉冲热负荷特征参数对三种流动不稳定现象的影响规律。本研究对脉冲能源系统热工水力设计具有指导意义。
Pulse heating is an inherent characteristic of energy systems based on inertial confinement fusion or fusion-fission hybrid reactors in the future. It is of great significance for the development of this new type of pulsed heating energy system to understand the basic characteristics and key influencing factors of the coolant flow instability under the pulse heating condition. In this paper, the flow instability in a vertical single channel tube under pulse heating is simulated. Results indicate that three different cases of flow pulsation or flow instability phenomenon will occur with the increase of heating power. According to the characteristics of the flow instabilities, it can be divided into slightly flow instability under subcooled condition, density wave flow instability under two-phase flow condition and mixed flow instability under superheated condition. Meanwhile, the influences of pulse heating power, heating cycle and duty ratio on flow instability are also discussed. The results have guiding significance for thermal-hydraulic design in pulse heating energy system.
Pulse heating is an inherent characteristic of energy systems based on inertial confinement fusion or fusion-fission hybrid reactors in the future. It is of great significance for the development of this new type of pulsed heating energy system to understand the basic characteristics and key influencing factors of the coolant flow instability under the pulse heating condition. In this paper, the flow instability in a vertical single channel tube under pulse heating is simulated. Results indicate that three different cases of flow pulsation or flow instability phenomenon will occur with the increase of heating power. According to the characteristics of the flow instabilities, it can be divided into slightly flow instability under subcooled condition, density wave flow instability under two-phase flow condition and mixed flow instability under superheated condition. Meanwhile, the influences of pulse heating power, heating cycle and duty ratio on flow instability are also discussed. The results have guiding significance for thermal-hydraulic design in pulse heating energy system.
引文
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[10]夏庚磊,董化平,彭敏俊,等.环隙窄缝通道管间脉冲不稳定性分析[J].原子能科学技术,2011,56(9):1034-1039Xia Genglei, Dong Huaping, Peng Minjun, et al. Analysis of Instability in Narrow Annular Multichannel System[J]. Atomic Energy Science and Technology, 2011, 56(9):1034-1039
[11]夏庚磊,郭埘,彭敏俊.平行通道密度波不稳定性研究[J].原子能科学技术,2012, 46(9):1073-1079Xia Genglei, Guo Yun, Peng Minjun. Investigation on Density Wave Instability in Parallel Channels[J]. Atomic Energy Science and Technology, 2012, 46(9):1073-1079
[2]丁文杰,郭海兵,王少华,等.高功率脉冲加热条件下燃料模块流动传热特性研究[J].原子能科学技术,2017, 51(12):2118-2124Ding Wenjie, Guo Haibing, Wang Shaohua, et al. Study on Flow and Heat Transfer Characteristics of Fuel Module under High Power Pulse Heating[J]. Atomic Energy Science and Technology, 2017, 51(12):2118-2124
[3]苏光辉,郭予飞,郭玉君,等.垂直上升管内密度波不稳定性的研究[J].核动力工程,1998, 19(1):12-14Su Guanghui, Guo Yufei, Gou Yujun et al. Study of Density Wave Oscillation in a Vertical Upflow Pipe[J]. Nuclear Power Engineering., 1998, 19(1):12-14
[4]冯自平,郭烈锦,陈学俊.卧式螺旋管内汽液两相流不稳定性试验研究[J].工程热物理学报,1996, 17(2):219-223Feng Ziping, Guo Liejing, Chen Xuejun. Experimental Investigation on the Convective Boiling Flow Instabilities of Steam/Water Two Phase Flow in Horizontal Helically Coiled Tube[J]. Journal of Engineering Thermophysics,1996, 17(2):219-223
[5] Ampomah-Amoako E, Ambrosini W. Developing a CFD Methodology for the Analysis of Flow Stability in Heated Channels with Fluids at Supercritical Pressures[J]. Annals of Nuclear Energy, 2013, 54:251-262
[6]高峰,陈听宽,罗毓珊,等.倾斜并联内螺纹管汽水两相流密度波型脉动试验研究[J].核动力工程,2005, 26(1):11-14Gao Feng, Chen Tingkuan, Luo Yunshan, et al. Experimental Research on Density Wave Oscillation of SteamWater Two Phase Flow in Parallel Inclined Internally Ridbed Pipes[J]. Nuclear Power Engineering, 2005, 26(1):11-14
[7]秋穗正,周涛,侯英东,等.液钠两相流动密度波型不稳定性实验机理分析[J].核科学与工程,1998, 18(4):297-303Qiu Suizheng, Zhou Tao, Hou Yingdong, et al. The Experimental Study on Density Wave Instability of Liquid Sodium Boiling in an Annular Channel. Chinese Journal of Nuclear Science and Engineering, 1998, 18(4):297-303
[8] Chen G, Quan X,Cheng P. Effects of Surfactant Additive on Flow Boiling over a Microheater under Pulse Heating[J]. International Journal of Heat and Mass Transfer, 2010,53(7/8):1586-1590
[9] Xu J, Zhang W. Effect of Pulse Heating Parameters on the Microscale Bubble Dynamics at a Microheater Surface[J]. International Journal of Heat and Mass Transfer,2008, 51(1/2):389-396
[10]夏庚磊,董化平,彭敏俊,等.环隙窄缝通道管间脉冲不稳定性分析[J].原子能科学技术,2011,56(9):1034-1039Xia Genglei, Dong Huaping, Peng Minjun, et al. Analysis of Instability in Narrow Annular Multichannel System[J]. Atomic Energy Science and Technology, 2011, 56(9):1034-1039
[11]夏庚磊,郭埘,彭敏俊.平行通道密度波不稳定性研究[J].原子能科学技术,2012, 46(9):1073-1079Xia Genglei, Guo Yun, Peng Minjun. Investigation on Density Wave Instability in Parallel Channels[J]. Atomic Energy Science and Technology, 2012, 46(9):1073-1079