Separation near the bushing of the flow in the outlet nozzle of the steam turbine at the low-flow rate modes
DOI:
https://doi.org/10.46299/j.isjea.20230202.05Keywords:
steam turbine, low-flow rate mode, outlet nozzle, separation near the bushingAbstract
The paper considers the movement of steam flow from the working wheel of the last stage with a large fanning to the outlet nozzle of a steam turbine, considering the conditions for the formation of the separation near the bushing in a wide range of mode changes. An assessment was made of the initiation and development of the separation near the bushing in the space of the outlet nozzle of the steam turbine. To analyze the formation of the movement of the working medium in the free space of the outlet nozzle, an axisymmetric flow model is used, which is described by the equation of the hyperboloid of rotation.
References
Щегляев, A. (1993). Паровые турбины. Теория теплового процесса и конструкции турбин. Энергоатомиздат, 384.
Karakurt, A., Güneş, Ü. (2017). Performance analysis of a steam turbine power plant at part load conditions. Journal of Thermal Engineering, 3(2), 1121–1128.
https://doi.org/10.18186/thermal.298611
Kim, S.-J.; Suh, J.-W.; Choi, Y.-S.; Park, J.; Park, N.-H.; Kim, J.-H. (2019). Inter-blade vortex and vortex rope characteristics of a pump-turbine in turbine mode under low flow rate conditions. Water, 11(12), 2554. https://doi.org/10.3390/w11122554
Arakelyan, E.K, Pikina, G.A., Andryushin, A.V, Mezin, S.V., Andryushin, K.A., Kosoy, A.A., Pashchenko, F.F. (2020). Features of steam turbine stages operation in low-flow modes when modeling hydrodynamic processes in the turbine in steamless and motor modes. The 10th International Symposium on Frontiers in Ambient and Mobile Systems (FAMS 2020), Warsaw, Poland, Procedia Computer Science, 935–940. https://doi.org/10.1016/j.procs.2020.03.105
Megerle, B., Rice, T., McBean, I., Ott, P. (2013). Unsteady Aerodynamics of Low-Pressure Steam Turbines Operating under Low Volume Flow. Proceeding of ASME Turbo Expo 2013: Turbine Technical conference and exposition, San Antonio, USA, 1–11. https://doi.org/10.5075/epfl-thesis-6096
Stanciu M., Marcelet M, Dorey J.-M. (2013) Numerical investigation of condenser pressure effect on last stage operation of low pressure wet steam turbines. Proceedings of ASME Turbo Expo 20013: Turbine Technical conference and exposition, San Antonio, USA, 769–773. https://doi.org/10.4028/www.scientific.net/AMM.670-671.769
Liu, B., Yang, J., Zhou, D., Zhu, X., Do, Z. (2015). Numerical Investigations of Flow Features in a Low Pressure Steam Turbine Last Stage under Different Mass Flow Rate. Proceeding of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, Montreal, Quebec, Canada, 1–11. https://doi.org/10.1115/GT2015-42916
Tanuma, T., Ogawa, M., Okuda, H., Hashimoto, G., Shibukawa, N., Okuna, K., Tsukuda, T. (2018). Unsteady Flow Effects on Steam Turbine Last Stage Blades at Very Low Load Operating Conditions. Proceeding of ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, 1–12. https://doi.org/10.1115/GT2018-76498
Кириллов, И. (1972). Теория турбомашин. Машиностроение, 536.
Gerschütz, W., Casey, M., and Truckenmüller, F. (2005). Experimental investigations of rotating flow instabilities in the last stage of a low-pressure model steam turbine during windage. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 219, 499–510. https://doi.org/10.1243/095765005X31379
Burton, Zoe. (2014). Analysis of Low Pressure Steam Turbine Diffuser and Exhaust Hood Systems. Doctoral thesis, Durham University. Available at Durham E-Theses Online, 163. http://etheses.dur.ac.uk/10531/
Hembera, M., Danner, F., Kainz, M., Kau, H.-P. (2009). Comparing Frequency-Based Flow Solutions to Traditional Unsteady Fluid Dynamics Analysis in Turbomachinery. High Performance Computing in Science and Engineering, 161–174. https://doi.org/10.1007/978-3-642-13872-0_14
Rusanov, A., Shvetsov, V., and other. (2020). The efficiency increase of the steam turbine low pressure cylinder last stage by the blades spatial profiling. Journal of Mechanical Engineering, vol. 23(1), 6–14. https://doi.org/10.15407/pmach2020.01.006
Korn, G. (2014). Справочник по математике для научных работников и инженеров: Определения, теоремы, формулы. Книга по Требованию, 832.
Shubenko, A. L., Goloshchapov, V. N., Senetska, D. O. (2020). The operation of the last stage of steam turbine at low-flow rate modes. Energetika, 66(1), 58—67. https://doi.org/10.6001/energetika.v66i1.4299
Быстрицкий, Л. Н. (1975). Исследование турбинных ступеней с малым отношением Dcp/l в диапазоне режимов работы от номинального до холостого хода/ Харьков, 203.
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Copyright (c) 2023 Oleksandr Shubenko, Svitlana Alyokhina, Volodymyr Goloshchapov, Olga Kotulska, Daria Senetska
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