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Stability analysis of parallel channels in flow boiling system: Flow maldistribution and density wave oscillations

机译：流沸腾系统中平行通道的稳定性分析：流量恶性和密度波振荡

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In a flow boiling thermal-hydraulic system, Density wave oscillations (DWO) and Flow maldistribution (FMD) are two important instability phenomena. These instabilities can lead to undesirable consequences of system operation. Thermal-hydraulic system with an odd number of channels behave differently as compared to an even number of channels. Following FMD for a two channel system, it leads to a new steady state operating condition. Here, one channel receives higher flowrate and another channel receives lower flowrate for a forced flow system. It may be possible that the new operating point is in a DWO zone. Post FMD, the individual flowrate of the channel starts to oscillate. It shall be noted that under constant mass flowrate condition, such local behaviour in the channels will be difficult to detect. For a twin-channel forced flow system, DWO which may be observed with/without FMD is related to out-of-phase oscillations only. It is thus interesting to study the interaction of DWO and FMD phenomena for a tri-channel flow boiling system. Symmetry breaking transition in the context of excursion instability (i.e., Ledinegg instability) is analyzed in this work. Here, a two and three channel system is used to analyze the two phenomena, FMD and DWO. The difference between the two and three channel flow boiling system is brought out in this work. Unlike two channel system, it is observed that a region in three channel system exists where both symmetrical and asymmetrical equilibrium solutions are unstable. Further, post FMD the solution starts to oscillate but the total system inflow and outflow remains constant. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在流动沸腾的热液压系统中，密度波振荡（DWO）和流量恶性分布（FMD）是两个重要的不稳定现象。这些不稳定性可能导致系统操作的不良后果。与偶数频道相比，具有奇数通道的热液压系统表现不同。在两个通道系统的FMD之后，它会导致新的稳态运行条件。这里，一个通道接收更高的流量，另一个信道接收用于强制流动系统的下流量。新的操作点可能是在DWO区域中。发布FMD后，通道的各个流量开始振荡。应当注意，在恒定质量流量条件下，信道中的这种局部行为将难以检测。对于双通道强制流动系统，可以使用/不具有FMD观察的DWO仅与相位超振荡相关。因此，研究DWO和FMD现象的相互作用对于三通道流沸腾系统。在这项工作中分析了在巡航不稳定性的背景下的对称性破坏转换（即，Ledinegg不稳定性）。这里，两和三个频道系统用于分析两种现象，FMD和DWO。这项工作中的两个和三个通道流沸腾系统之间的差异。与两个频道系统不同，观察到，存在三种信道系统中的区域，其中对称和不对称的平衡溶液不稳定。此外，POST FMD溶液开始振荡，但总系统流入和流出保持不变。 （c）2019年elestvier有限公司保留所有权利。

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