C形管池沸腾两相流流场模拟与流固耦合分析

doi:10.16085/j.issn.1000-6613.2023-0378

摘要/Abstract

摘要：

热交换器作为化工和核电中重要的换能设备，管束的流致振动（FIV）成为诱发管束破裂的重要因素，其安全可靠性变得尤为重要。本文为研究非能动余热排出热交换器（PRHR HX）运行工况下C形管的流致振动响应，将壳侧的换料水箱（IRWST）和C形管进行了简化，开展了流场和振动响应的数值模拟计算。结果表明，温度场中自然对流和强迫对流交汇引发的速度断层，由于流速的损失，气泡无法被冲刷，合并包裹管壁热性能下降，产生过渡沸腾，这种沸腾降低了热通量产生热分层的现象。水箱可以分气液两相热流区、单相热流区和冷流区为3个区域。其中气液两相热流区存在高湍动能，空泡率达到50%，这使得蒸汽快速生长和坍塌提供扰动的动力，并且C形管结构阻尼比有所降低，在远离固支端的上弯管处成为诱发振动最大的区域。根据C形管的振动结果，在上弯管处C形管受气液两相热流冲击时振动最为剧烈，方向为C形管面内方向，在PRHR HX中该位置管束容易与支撑和防振组件发生磨损，存在管束破裂的潜在危险。

关键词: C形管, 池沸腾, 两相流流场模拟, 流固耦合

Abstract:

As a heat exchanger is an important energy transfer equipment in chemical and nuclear power, the fluid induced vibration (FIV) of the tube bundle becomes an important factor to induce the tube bundle rupture. So the safety and reliability of the tube bundle becomes especially important. In order to study the flow induced vibration response of C-tube in the passive residual heat removal heat exchanger (PRHR HX), the in-containment refueling water storage tank (IRWST) and C-tube were simplified, and the numerical simulation of the flow field and vibration response were carried out. Simulation results showed that the intersection of natural and forced convection in the temperature field caused by the velocity disruption, due to the loss of flow velocity, vapor bubbles can not be flushed, combined and wrapped with tube, resulting in transition boiling, the boiling reduces the heat flux to produce the phenomenon of thermal stratification. According to the fluid flow characteristics, the flow field can be divided into three regions:gas-liquid two-phase hot flow region, hot flow region, cold flow region. Among them, there was high turbulence energy in the gas-liquid two-phase hot flow region, and the steam volume fraction reaches 50%, which made the rapid growth and collapse of steam to provide the disturbance, and the damping ratio of C-shaped tube structure was reduced, so the upper bend at the end away from the solid support became the region with the largest induced vibration. Based on the vibration results, the vibration direction is the C-tube plane, and the position of the upper bend vibrates were most strongly impacted by the gas-liquid two-phase hot flow. Therefore, the tube bundle at this position in PRHR HX was prone to wear with the support and anti-vibration components, and there was a potential risk of tube bundle rupture.

Key words: C-tube, pool boiling, two-phase flow simulation, fluid-structure coupling

中图分类号:

TQ053

徐若思, 谭蔚. C形管池沸腾两相流流场模拟与流固耦合分析[J]. 化工进展, 2023, 42(S1): 47-55.

XU Ruosi, TAN Wei. Flow field simulation and fluid-structure coupling analysis of C-tube pool boiling two-phase flow model[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 47-55.

图/表 17

参考文献 26

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项目	横向段管长/mm	竖直段管长/mm	圆角半径/mm	总长度/mm
第1排管	711.9	923.8	250	3132.6
第2排管	750	1000	250	3285
第3排管	788.1	1076.2	250	3437.4

项目	横向段管长/mm	竖直段管长/mm	圆角半径/mm	总长度/mm
第1排管	711.9	923.8	250	3132.6
第2排管	750	1000	250	3285
第3排管	788.1	1076.2	250	3437.4

网格数	温度/℃
793万	61.5
936万	60.2
1266万	60.3

网格数	温度/℃
793万	61.5
936万	60.2
1266万	60.3

项目	液态水	水蒸气
密度/kg·m^-3	61.5	60.2
定压比热容c_p /J·kg^-1·K^-1	4182	多项式(13)计算
热导率/W·m^-1·K^-1	0.6	0.0261
黏度/kg·m^-1·s^-1	0.001003	1.34×10^-5
摩尔质量/kg·kmol^-1	18.0152	18.01534
标准状态焓/J·kmol^-1	-2.858412×10⁸	-2.418379×10⁸
相关温度/K	313.15	313.15