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由环形燃料板组成的多层环形燃料组件容易发生流道阻塞事故,对流道阻塞情况下的流动与换热特性进行研究非常有必要。本文对多层环形流道阻塞事故在进行三维数值分析研究中的基础问题进行探讨,验证尺度化壁面函数在流量持续降低工况下的适用性。对流道入口发生90%堵塞的工况,分别运用速度入口与压力入口的边界条件进行计算,证明压力入口是流道阻塞事故计算流体动力学(CFD)研究保守、可信的边界条件。对堵塞工况进行瞬态与稳态计算,分析流量与功率的再分配。
Multi-layer annular fuel assemblies composed of annular fuel plates are prone to blockage of runners, and it is necessary to study the flow and heat transfer characteristics in the case of runner blockage. In this paper, the basic problems of three-dimensional numerical analysis in the case of multi-layer annular flow path blockage are discussed, and the applicability of the standardized wall surface function in case of continuous flow reduction is verified. The case of 90% blockage of the runner inlet was calculated using the boundary conditions of the velocity inlet and the pressure inlet, respectively. It is proved that the pressure inlet is a clogging of the runner. Computational fluid dynamics (CFD) is a conservative and credible boundary condition. Transient and steady state calculation of the jamming conditions, analysis of traffic and power redistribution.