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首页> 外文会议>7th Biennial Conference on Engineering Systems Design and Analysis 2004(ESDA 2004) vol.1: Advanced Energy Systems; Advanced Heat Transfer in Engineering Systems; ... >REACTOR SAFETY ANLAYSIS BASED ON A DEVELOPED TWO-PHASE COMPRESSIBLE FLOW SIMULATION
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REACTOR SAFETY ANLAYSIS BASED ON A DEVELOPED TWO-PHASE COMPRESSIBLE FLOW SIMULATION

机译：基于改进的两相可压缩流模拟的反应堆安全性分析

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The direct numerical simulation of multiphase flow is a challenging research topic with various key applications. In the present work, a computational simulation of multi-phase compressible flow has been proposed for safety analysis of chemical reactors. The main objective of a pressure relief system is to prevent accidents occurring from over pressurisation of the reactor. We are particularly interested in understanding the phenomena associated with emergency pressure relief systems for batch-type reactors and storage vessels. Existence of multiphase flow is significantly influenced by the interface between the phases and the associated discontinuities across the phase. The approach, which builds on the method first introduced by Saurel and Ab-grall, was developed for solving two-phase compressible flow problems. Each phase is separately described by conservation equations. The interactions between two phases appear in the basic equations as transfer terms across the interface. The equations are complemented by state equations for the two phases and by additional correlations for the right-hand side coupling terms. The method is able to deal with multiphase mixtures and interface problems between compressible fluids. The key difference compared to classical two-fluid model is the presence of separate pressures fields associated with phases and introduction of pressure and velocity relaxation procedures. The relaxation operators tackle the boundary conditions at the interface and consequently the model is valid for fluid mixtures, as well as for pure fluids. The numerical technique requires the system to be decomposed and involves a non-conservative hyperbolic solver, an instantaneous pressure relaxation procedure and source term operators. The solution is obtained by succession of integrators using a second-order accurate scheme. The ultimate goal of this research is to use the method for studying the venting problem in reactor systems after verifying its performance on a series of standardised test cases documented in the literature.
机译：多相流的直接数值模拟是具有各种关键应用的具有挑战性的研究主题。在目前的工作中，已经提出了用于化学反应器安全性分析的多相可压缩流的计算仿真。泄压系统的主要目的是防止反应堆因过度加压而发生事故。我们特别有兴趣了解与间歇式反应堆和储存容器的应急泄压系统有关的现象。多相流的存在受到两相之间的界面以及整个相的相关不连续性的显着影响。该方法基于Saurel和Ab-grall最初提出的方法，是为解决两相可压缩流动问题而开发的。每个阶段均由守恒方程式描述。两相之间的相互作用在基本方程式中显示为跨界面的传递项。这些方程由两相的状态方程和右侧耦合项的附加相关性补充。该方法能够处理多相混合物和可压缩流体之间的界面问题。与经典的双流体模型相比，主要区别在于存在与相相关的单独压力场以及引入了压力和速度松弛程序。松弛算子解决了界面处的边界条件，因此该模型对于流体混合物以及纯流体都是有效的。数值技术要求对系统进行分解，并涉及非保守的双曲解算器，瞬时压力松弛程序和源项运算符。该解决方案是通过使用二阶精确方案的一系列积分器获得的。这项研究的最终目标是在文献中记录的一系列标准化测试案例中验证其性能后，使用该方法研究反应堆系统中的排气问题。

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