斜向三通管内射流混合特性的三维数值模拟

Numerical Simulation of 3D Inclined Jet to Cross Flow

针对反应堆安全注射过程中的热冲击问题,应用基于有限差分的有限容积法和k-ε紊流模型,分别对支管倾角为30°、60°、90°、120°和150°的倾斜三通管内的流动和换热进行三维数值模拟研究,得到了三通管内的流动结构、压力分布与温度分布。分析了三通管几何结构、流动条件和流体温度变化对三通管内的流动结构、温度分布及热应力的影响。结果表明,主流与支管射流的温度差、支管倾角对三通管内的热应力的影响较大,在三通管的迎流侧热应力表现更为明显。

This paper is concerned with the thermal shock when the cold safety injection fluid is injected into the nuclear reactor. Based on a control volume method and k-ε turbulence model, numerical simulation was carried out to investigate the flow and the heat transfer of 3D inclined jet to cross flow at angles of 30°, 60°, 90°, 120° and 150° in the T-junction pipes. The pressure distribution, the temperature distribution and the flow structure were thoroughly studied. The paper analyzed the effect of geometric structure, the flow condition and the temperature variety on the flow structure, temperature distribution and thermal stress. The study found that temperature difference and velocity ratio had great effect on the thermal stress. On the upstream of the jet, thermal stress is more powerful.