The safe operation of a two-phase heat exchanger can be performed by determining the instability threshold values of power plant parameters. Thus, the power plant parameters must be designed outside these thresholds to avoid undesirable instability. The fluctuations in mass flow and system pressure are undesirable processes, resulting in system failure. In diverse heat transfer distribution, that can lead to burn-out of heat exchanger tubes. Therefore, the maintaining of flow stability in a power plant is of particular relevance. The researchers and engineers can predict the threshold of flow instability with dynamic models validated with experimental records. The phenomenon of dynamic flow instabilities in two-phase flows is an important issue that has high relevance for many industries. The awareness about the triggers and the effects of fluid dynamic instabilities is of great importance in the design and operation of steam generators, refrigeration systems, thermosiphons or boiling water reactors. These instabilities manifest themselves in variations of mass flow, pressure, and fluid properties. In this work, the dynamic instabilities involved in evaporation processes were briefly discussed with simple models to understand the mechanism of its different types. Additionally, it is presented the design and construction of a two-phase flow test rig using the similarity and the scaling criteria. A heat recovery steam generator (HRSG) designed by Doosan Heavy Industries and Construction is scaled down to 4 × 4 × 2 m³. The combination of the flow diagram and the thermohydraulic design is represented in three-dimension model of the test rig using the Siemens NX 10.0 software. The flexibility of operation was taken into account in the design of this test rig. Finally, we provided preliminary results to showcase some functionalities and the capability of the test rig to characterize the existing flow pattern through the evaporator and investigate the internal characteristic curve of the evaporator.

可以通过确定电厂参数的不稳定阈值来执行两相热交换器的安全运行。因此，电厂参数必须设计在这些阈值之外，以避免不希望的不稳定。质量流量和系统压力的波动是不希望的过程，导致系统故障。在各种传热分布中，这可能导致热交换器管烧坏。因此，保持发电厂中的流动稳定性特别重要。研究人员和工程师可以使用经过实验记录验证的动态模型来预测流动不稳定性的阈值。两相流中的动态流不稳定性现象是一个重要的问题，与许多行业都息息相关。在蒸汽发生器，制冷系统，热虹吸管或沸水反应堆的设计和运行中，对引起流体动力学不稳定的原因和影响的认识非常重要。这些不稳定性表现为质量流量，压力和流体特性的变化。在这项工作中，使用简单的模型简要讨论了蒸发过程中涉及的动态不稳定性，以了解其不同类型的机理。此外，还介绍了使用相似性和缩放标准的两相流试验台的设计和建造。斗山重工业设计的热回收蒸汽发生器（HRSG）缩小为4×4 热虹吸管或沸水反应堆。这些不稳定性表现为质量流量，压力和流体特性的变化。在这项工作中，使用简单的模型简要讨论了蒸发过程中涉及的动态不稳定性，以了解其不同类型的机理。此外，还介绍了使用相似性和缩放标准的两相流测试设备的设计和构造。斗山重工业设计的热回收蒸汽发生器（HRSG）缩小为4×4 热虹吸管或沸水反应堆。这些不稳定性表现为质量流量，压力和流体特性的变化。在这项工作中，使用简单的模型简要讨论了蒸发过程中涉及的动态不稳定性，以了解其不同类型的机理。此外，还介绍了使用相似性和缩放标准的两相流试验台的设计和建造。斗山重工业设计的热回收蒸汽发生器（HRSG）缩小为4×4 此外，还介绍了使用相似性和缩放标准的两相流测试设备的设计和构造。斗山重工业设计的热回收蒸汽发生器（HRSG）缩小为4×4 此外，还介绍了使用相似性和缩放标准的两相流试验台的设计和建造。斗山重工业设计的热回收蒸汽发生器（HRSG）缩小为4×4×2 m ³。使用西门子NX 10.0软件在试验台的三维模型中表示了流程图和热工液压设计的结合。该试验台的设计考虑了操作的灵活性。最后，我们提供了初步结果，以展示测试装置的某些功能和能力，以表征通过蒸发器的现有流动模式，并研究蒸发器的内部特性曲线。