Industrial Technology (Green Process and Energy System Engineering), University of Science and Technology, Daejeon, South Korea.
Carbon Neutral Technology R&D Department, Research Institute of Clean Manufacturing System, Korea Institute of Industrial Technology, Cheonan, South Korea.
Sci Rep. 2022 Sep 9;12(1):15240. doi: 10.1038/s41598-022-19530-9.
The stall in an axial fan is directly related to detrimental phenomena such as performance degradation, vibration, noise, and flow instability at low flow rates. As a kind of passive control method to handle the stall, two-dimensional plates so-named anti-stall fin (ASF) were suggested by ourselves and were attached inside the casing. In this study, the ASF's effect on the internal flow pattern was visually investigated in the flow passage, and its tendency was discussed with the performance curve. Subsequently, the ASF's functional limitations for various design parameters, which the ASF can derive aerodynamically, were presented as the primary focus of this study. Each one-factor analysis was performed, and the internal flow pattern was observed in parallel at the point where the ASF lost its function. For the radial length, axial length, number of fins, and positive-tangential angle, the ASF almost retained its function up to the limitation to prevent instability but radically lost its function at a certain flow rate. For the axial gap and negative-tangential angle, the ASF gradually lost its function. Mostly, this study was based on numerical analysis, and the performance was validated through experimental tests.
失速喘振会导致性能下降、振动、噪声和低流量时的流动不稳定性等有害现象，轴流风机中的失速喘振与这些现象直接相关。作为一种处理失速的被动控制方法，我们提出了二维所谓的防喘振翼片（Anti-Stall Fin，ASF），并将其安装在机壳内部。在本研究中，我们通过可视化观察流道内的流动模式，探讨了 ASF 对内部流动模式的影响，并结合性能曲线讨论了其趋势。随后，我们提出了 ASF 在各种设计参数方面的功能限制，这些参数是 ASF 可以从空气动力学中获得的。我们进行了单因素分析，并在 ASF 失去功能的点上同时观察内部流动模式。对于径向长度、轴向长度、翼片数量和正切向角度，ASF 几乎可以在防止不稳定的限制范围内保持其功能，但在一定流量下会突然失去功能。对于轴向间隙和负切向角度，ASF 则逐渐失去功能。本研究主要基于数值分析，并通过实验测试验证了性能。
