搜索结果: 1-13 共查到“核科学技术 CFD”相关记录13条 . 查询时间(0.156 秒)
核电站严重事故发生后,反应堆压力容器(RPV)的剩余固壁在高温差、内压、熔池重量等的作用下可能发生蠕变失效。本文以CPR1000 RPV为研究对象,基于FLUENT软件二次开发求解反应堆压力容器下封头烧蚀温度场,然后基于ANSYS Workbench开展耦合CFD-FEM力学分析,求解严重事故下RPV烧蚀温度场稳定后72 h内的等效应力、等效塑性应变和等效蠕变应变,并评估了RPV的蠕变失效风险。结...
在压水堆燃料组件的定位格架下游,局部扰动沿流动方向逐渐衰减,流场最终趋于稳定。光滑棒束区冷却剂的湍流流动和交混特性是影响反应堆经济性和安全性的重要因素,有必要进行深入研究。本文采用粒子图像测速(PIV)与数值模拟(CFD)相结合的方法,对3×3小规模棒束内水的流动特性进行研究,得到了一阶平均流速以及二阶湍流统计信息。结果表明,中心子通道的速度明显高于棒间隙区,但轴向均方根速度呈现出相反的变化趋势。...
基于CFD方法的铅铋冷却燃料棒束的热工水力特性分析
铅铋合金 计算流体力学 热工水力 绕丝
2021/1/11
铅铋冷却快堆作为第4代反应堆候选之一具有安全性高等特点,研究其在正常工况下的热工水力特性具有重要意义。本文基于商用计算流体力学(CFD)软件STAR-CCM+,使用流固耦合的方法对带有绕丝结构的19棒束铅铋组件进行数值分析,探究了质量流量、功率等边界条件对组件内部流动传热特性的影响。模拟计算结果表明:CFD方法在子通道中心温度和壁面温度预测上与实验结果取得了较好的一致。同时,绕丝结构的存在使得子通...
利用三维计算流体力学程序GASFLOW分析了气溶胶的再悬浮行为。通过拉格朗日粒子模型计算得出再悬浮率,并将所得结果与集总参数程序ASTEC的计算结果与国际标准例题中的STORM试验台架测试的SR11试验结果进行对比。计算结果表明,GASFLOW程序能较好地模拟气溶胶的再悬浮行为,且相对于集总参数程序而言,能清晰直观地展示不同时刻气溶胶的位置分布,可为压水堆核电站严重事故条件下的气溶胶行为分析提供参...
单盒钠冷快堆燃料组件堵流事故的CFD分析
钠冷快堆 堵流事故 数值模拟 包壳温度
2020/1/16
钠冷快堆大都采用金属绕丝来固定燃料组件,细长狭窄的流道容易积聚腐蚀沉积物,可能会引起钠的局部沸腾和包壳的传热恶化。本文利用商用计算流体动力学软件STAR-CCM+程序对中国实验快堆单盒燃料组件的堵流事故进行了数值模拟,分析了包壳内壁面温度与冷却剂在堵块附近的轴向流场分布,并与正常工况下的计算结果进行对比。计算结果表明:实心介质堵流危害比多孔介质更为严重;实心介质堵流事故的包壳峰值温度局部最高点始终...
不同棒束结构稠密栅元通道内的湍流CFD研究
稠密栅元 URANS 流动振动 相干结构
2012/5/23
采用URANS(Unsteady Reynolds Averaged Navier Stokes)方法对不同棒束结构稠密栅元通道(P/D=1.001~1.2)内的湍流流动进行CFD模拟。研究分析了不同Re(Re=5 000~215 000)的湍流流动的主流速度、壁面剪应力、湍动能等参数。研究表明:在较稠密的棒束(P/D<1.1)通道内,P/D的变化对子通道内主流速度和剪应力分布均有较大影响。本文的...
CFD Code Validation against Stratified Air-Water Flow Experimental Data
CFD Code Validation Air-Water Flow Experimental Data
2009/9/3
Pressurized thermal shock (PTS) modelling has been identified as one of the most important industrial needs related to nuclear reactor safety. A severe PTS scenario limiting the reactor pressure vesse...
CFD Approaches for Modelling Bubble Entrainment by an Impinging Jet
Modelling Bubble Entrainment Impinging Jet
2009/9/3
This contribution presents different approaches for the modeling of gas entrainment under water by a plunging jet. Since the generation of bubbles happens on a scale which is smaller than the bubbles,...
CFD Simulation of Polydispersed Bubbly Two-Phase Flow around an Obstacle
CFD Polydispersed Bubbly
2009/9/3
This paper concerns the model of a polydispersed bubble population in the frame of an ensemble averaged two-phase flow formulation. The ability of the moment density approach to represent bubble popul...
Review of Available Data for Validation of Nuresim Two-Phase CFD Software Applied to CHF Investigations
Available Data Nuresim Two-Phase CFD
2009/9/3
The NURESIM Project of the 6th European Framework Program initiated the development of a new-generation common European Standard Software Platform for nuclear reactor simulation. The thermal-hydraulic...
CFD Analysis of a Slug Mixing Experiment Conducted on a VVER-1000 Model
CFD VVER-1000 Model
2009/9/3
A commercial CFD code was applied, for validation purposes, to the simulation of a slug mixing experiment carried out at OKB “Gidropress” scaled facility in the framework of EC TACIS project R2.02/02:...
CFD Simulation of Thermal-Hydraulic Benchmark V1000CT-2 Using ANSYS CFX
CFD Thermal-Hydraulic
2009/9/3
Plant measured data from VVER-1000 coolant mixing experiments were used within the OECD/NEA and AER coupled code benchmarks for light water reactors to test and validate computational fluid dynamic (C...