共查询到19条相似文献,搜索用时 62 毫秒
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CFD技术在国外燃料组件热工水力性能及格架研制中的应用 总被引:2,自引:0,他引:2
从反应堆堆芯中导出核裂变产生的热能是为了利用这些热能,也是安全的需要。反应堆热工水力研究的任务之一是研究改进和增强堆芯中燃料组件与冷却剂流体换热能力的方法,以提高燃料元件在安全的原则下的发热功率,或在一定的功率负荷下。使燃料元件有较大的安全裕度。 相似文献
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300MW燃料组件定位格架导向翼三维流场分析 总被引:3,自引:0,他引:3
从三维流场分析角度验证了300MW燃料组件定位格架导向翼初步设计改进方案的合理性,采用流体计算软件对燃料组件定位格架或棒束定位格架进行计算,比较导向翼修改前后的定位格架水力特性和导向翼周围流场的变化,为实际工程应用提供了依据。 相似文献
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文章用理论计算和工程经验相结合的方法给出了我国自行设计的快堆燃料组件(参考设计)的水力特性。并与用国际上发表的多种关系式计算结果进行了比较,吻合较好。该计算结果对燃料组件的设计和热工计算有一定的参考价值。 相似文献
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定位格架是燃料组件骨架结构的重要组成部分,其主要功能是夹持定位燃料棒,同时还应考虑防勾挂性能和热工性能。本文从主流燃料组件的运行经验反馈出发,利用三维建模软件UG模拟格架相对运动的方法,对产生勾挂的原因进行分析,明确了外条带导向翼采用连续排列能有效提高防勾挂性能,并通过定位格架勾挂试验进行了验证;通过对定位格架所在边栅元内的计算流体力学(CFD)模拟分析,发现基于传统防勾挂设计的导向翼连续排列形式不利于相邻格架之间的热工性能;在此基础上,设计了导向翼高矮交替排列的方案。理论分析和试验验证结果表明,该方案实现了燃料组件定位格架防勾挂与热工性能的协同设计。 相似文献
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反应堆核燃料组件定位格架的两相流动压降计算 总被引:1,自引:0,他引:1
燃料组件定位格架的两相流动压降计算是反应堆热工水力计算的一个重要内容.本文从两相流动的机理分析入手,根据动量平衡关系推导出了定位格架的两相流压降计算关系式.并用实验数据进行了验证,实验数据与计算公式之间的偏差不超过±30%. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(8):628-631
Wide range of parameter surveys are made on the DT fusion tokamak experimental reactor next to JT-60. Various physics and engineering requirements are taken into account, e.g. self-ignition, available maximum toroidal β value, α-particle confinement, total fusion power, neutron wall loading, heat flux to divertor plate, structural restriction on major radius, device size, maximum toroidal magnetic field, poloidal field power supply and so on. Theoretical scaling law for the available maximum toroidal β value determined by ballooning mode instability is used. The toroidal magnetic field on plasma axis can be expressed by the aspect ratio A for a given maximum field at the toroidal field coil conductor. Empirical scaling law for the electron energy confinement and neoclassical heat conductivity for the ion are employed. These confinement times can be expressed by the plasma minor radius a and A through the maximum available β value and the toroidal field on axis. In the similar way, most of the physics and engineering requirements can be mapped on the a-A diagram. This diagram enables us to make systematic and wide range of parameter surveys of the device. In particular, this offers a clear perspective on the device parameters, which can mitigate the engineering difficulties and can also realize the required plasma performances. 相似文献
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三维数值分析方法特别是计算流体动力学(CFD)技术越来越普遍的应用于反应堆热工流体设计中,载热质通常都具有高温、高压、流场形状不规则等诸多特点,在考虑复杂流场中对流项与扩散项综合作用的同时,还需要考虑到温度、压力、相变对流动的影响。本文就应用于反应堆热工水力设计中特殊形状流道和狭窄通道的数值计算方法进行调研,对三维模型的建立方法、差分方法的选择、特殊流场的数学模型修正以及计算的高效性和多尺度耦合方案进行了概要的介绍。 相似文献
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基于COMSOL平台开发了一套基于多物理场全耦合的燃料性能分析程序,并通过径向功率分布模型对比验证了该程序的正确性与准确性;然后进一步分析了U3Si2燃料与双层SiC包壳组合、U3Si2燃料与锆合金包壳组合在反应堆正常运行工况下的性能,并与UO2燃料与锆合金的组合进行了对比分析。计算结果发现U3Si2燃料与锆合金包壳组合相比UO2燃料与锆合金的组合具有更低的燃料中心温度、裂变气体释放量及内压,但气隙闭合时间会提前;而U3Si2燃料与双层SiC包壳的组合相比U3Si2燃料与锆合金的组合具有更高的燃料中心温度、更大的裂变气体释放量及内压,且随着燃耗的增加,其燃料中心温度大幅增加,与锆合金包壳相比,双层SiC包壳能够有效延迟气隙闭合,缓解燃料与包壳的力学相互作用。 相似文献
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This paper reports a new project - the poloidal field (PF) grid power supply system to replace the ac flywheel generator power supply system on the basis of the present running parameters of the HT-7 poloidal field and the short-circuit capacity of our transformer substation. The designed parameters of the PF grid power supply system have been verified to meet the requirements of the heating field (HF) and the vertical field (VF). In the meantime, in order to reduce the disturbance to the local power grid, the device of reactive power and harmonic current compensation has been added. Experimental results have confirmed the feasibility of the PF grid power supply system. Compared with the ac flywheel generator, the PF grid power supply system has the advantages of lower noise, precise control, convenient maintenance, simple operation and cost savings. 相似文献
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施乐 《等离子体科学和技术》2005,7(5):2989-2993
In the initial phase of the physics experiment, the double-null divertor plates used consist of graphite armor tiles, Mo-alloy intermediate layers and Cu-alloy coolant tubes. In the later operating phase, tungsten will be used as armor tiles. A multi-physical field numerical analysis method is used in this paper. Its analysis model reflects more realistically the real divertor structure than other models. Two-dimensional (2D) and three-dimensional (3D) fluid flow field, temperature distribution and thermal stress analyses of the divertor plates are carried out by the ANSYS code. During the physics experimental phase with a heat flux of 1 MW/m2, a coolant velocity of 5.48 m/s, and a thermal stress of 750 kg/cm2, the graphite armor tiles successfully meet the requirements of temperature, thermal stress and sputtering erosion. The tungsten armor will be considered as a second candidate. The result of simulation can be used for upgrading the design parameters of the HL-2A poloidal divertor. 相似文献
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