Hajiahmadi Amin, Crispino Gaetano, Ghaeini-Hessaroeyeh Mahnaz, Gisonni Corrado
Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman 76169133, Iran.
Department of Engineering, Università degli Studi della Campania 'L. Vanvitelli', Via Roma 29, Aversa 81031, Italy E-mail:
Water Sci Technol. 2022 Sep;86(5):1095-1107. doi: 10.2166/wst.2022.274.
If the operation of existing vortex drop shafts should be verified, then it is essential to know the hydraulic performance of these special structures under both subcritical and supercritical flow regimes. The purpose of the present research consisted of providing practical guidelines and recommendations for managing the hydraulic design and verification of subcritical and supercritical vortex drop shafts. The examination of various experimental results from physical model investigations allowed to show that the inlet channel and the spiral inlet behaved differently depending on the energy approach flow content. The main dissimilarity lay, however, in the functioning of the vertical shaft and the dissipation chamber. The rotation of the falling flow along the vertical shaft was more evident for approaching supercritical flows. Severe flow conditions in terms of water depths and bottom pressures could be observed in the dissipation chamber under a supercritical flow regime. The design of this special component must be carried with prudence compared with the subcritical flow regime because failure events as the chamber submergence and the crash of the bottom surface just under the shaft outlet may occur for approaching supercritical flows.
如果要验证现有涡流式竖井的运行情况，那么了解这些特殊结构在亚临界和超临界流态下的水力性能至关重要。本研究的目的是为亚临界和超临界涡流式竖井的水力设计与验证管理提供实用指南和建议。对物理模型试验的各种实验结果进行研究后发现，进水渠道和螺旋形进水口的表现会因能量接近水流含量的不同而有所差异。然而，主要差异在于竖井和消能室的运行方式。对于接近超临界的水流，下落水流沿竖井的旋转更为明显。在超临界流态下，消能室内会出现水深和底部压力方面的严峻水流条件。与亚临界流态相比，这种特殊部件的设计必须谨慎进行，因为对于接近超临界的水流，可能会发生诸如消能室淹没以及竖井出口正下方底面坍塌等故障事件。
