Flashing flow in the rotating curved channels with variable cross-section of a two-phase flow turbine
Flashing flow in the rotating curved channels with variable cross-section of a two-phase flow turbine
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DOI：
10.1016/j.icheatmasstransfer.2021.105434
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发表时间：
2021-07
影响因子：
7
通讯作者：
Hongyang Li;Zhibin Yu
中科院分区：
文献类型：
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作者：
Hongyang Li;Zhibin Yu
旋转闪蒸流的特性对两相流涡轮机的性能有着重要的影响，但对旋转闪蒸流的研究很少。本文通过对闪蒸流场的CFD分析，并结合实验数据进行验证，采用Frenet坐标系下的流动方程，对不同转速下闪蒸流场的平均流动参数之间的关系进行了理论和数值研究。在不同转速下的质量流率的比例被形式化，并发现是依赖于转速和热物理性质。蒸汽的产生和发展被揭示并与通道的几何形状相关。讨论了闪蒸旋转通道中的二次流，发现在喉部的上游/下游沿相反方向旋转。在喉部附近诱发的闪蒸对沿截面法向的流动有影响。该分析可进一步应用于旋转单相流与旋转闪蒸流之间二次流的类比。
The rotating flash flow has rarely been studied, although its characteristics affect significantly the performance of the two-phase flow turbine. In this paper, through analyzing the flashing flow obtained by CFD methods, which is validated with the experimental data, the relationships of average flow parameters under various rotational speeds were studied theoretically and numerically using the flow equations established on the Frenet coordinate system. The ratio of the mass flow rate under various rotational speeds was formalized and found to be dependent on the rotational speed and thermophysical properties. The generation and development of vapour were revealed and correlated to the geometry of the channel. The secondary flow in the flashing rotating channel was discussed and found to rotate in opposite directions upstream/downstream of the throat. The flashing induced near the throat had the effect on flow homogenizing in the normal direction of the cross-section. The analysis could be further applied to the analogy of the secondary flow between the rotating single-phase flow and the rotating flashing flow.