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首页> 外文会议>14th International Conference on Nuclear Engineering 2006(ICONE14) vol.4 >STUDIES OF THE DETERIORATED TURBULENT HEAT TRANSFER REGIME FOR THE GAS-COOLED FAST REACTOR DECAY HEAT REMOVAL SYSTEM
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STUDIES OF THE DETERIORATED TURBULENT HEAT TRANSFER REGIME FOR THE GAS-COOLED FAST REACTOR DECAY HEAT REMOVAL SYSTEM

机译：气冷式快速反应器衰减除热系统中湍流换热规律的研究

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Increased reliance on passive emergency cooling using natural circulation of gas at elevated pressure is one of the major goals for the Gas-cooled Fast Reactor (GFR). Since GFR cores have high power density and low thermal inertia, the decay heat removal (DHR) in depressurization accidents is a key challenge. Furthermore, due to its high surface heat flux and low velocities under natural circulation in any post-LOCA scenario, three effects impair the capability of turbulent gas flow to remove heat from the GFR core, namely: (1) Acceleration effect (2) Buoyancy effect (3) Properties variation.rnThis paper reviews previous work on heat transfer mechanisms and flow characteristics of the Deteriorated Turbulent Heat Transfer (DTHT) regime. It is shown that the GFR's DHR system has a potential for operating in the DTHT regime by performing a simple analysis. A description of the MIT/INL experimental facility designed and built to investigate the DTHT regime is provided together with the first test results. The first runs were performed in the forced convection regime to verify facility operation against well-established forced convection correlations. The results of the three runs at Reynolds numbers 6700, 8000 and 12800 showed good agreement with the Gnielinsky correlation, which is considered the best available heat transfer correlation in the forced convection regime and is valid for a large range of Reynolds and Prandtl numbers. However, even in the forced convection regime, therneffect of heat transfer properties variation of the fluid was found to be still significant.
机译：气冷快堆（GFR）的主要目标之一是增加对使用天然气自然循环高压的被动紧急冷却的依赖。由于GFR磁芯具有高功率密度和低热惯性，因此降压事故中的衰减热量消除（DHR）是一项关键挑战。此外，由于在任何LOCA后的情况下，其在自然循环下的高表面热通量和低速，三种影响会削弱湍流气流从GFR芯中带走热量的能力，即：（1）加速作用（2）浮力效果（3）特性变化。本文回顾了恶化湍流传热（DTHT）方案中传热机理和流动特性的先前工作。通过简单的分析表明，GFR的DHR系统具有在DTHT制度下运行的潜力。提供了对MIT / INL实验设施的描述，该设施是为研究DTHT制度而设计和建造的，并提供了第一个测试结果。第一次运行是在强制对流方式下进行的，以针对完善的强制对流相关性验证设施运行。雷诺数分别为6700、8000和12800的三个运行的结果与Gnielinsky相关性很好地吻合，后者被认为是强制对流方式中最佳的传热相关性，并且适用于大范围的雷诺数和Prandtl数。但是，即使在强制对流状态下，流体的传热特性变化的影响仍然很显着。

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