Study of Vibrational and Mechanical Properties of Pre-Tensioned Banded Stator Blades of an Axial Compressor

The article considers the effect of the stator blade tension of an axial compressor on blade vibration and mechanical properties. Attention is paid to modeling the stress-strain state of a pre-tensioned blade and calculating the strength of the developed model as well as modal analysis. A method of stator blade pre-tensioning is proposed: the blade root is fixed in the groove of the body, and fitting into the shroud ring is made with a gap providing the blades with the necessary space for stretching. The tension is adjusted by changing the position of the tightening nut. Nuts are tightened evenly around the circumference. The proposed method allows increasing the rigidity of the stator blades and, consequently, reducing their thickness in order to improve aerodynamic performance while maintaining vibration-frequency characteristics. The pre-tension has the greatest influence on bending shapes. The ability to regulate the natural vibration frequencies of the stator blade in a wide range allows avoiding resonance.

References

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[19] Kataev V.A. High pressure compressor. Permskie aviatsionnye dvigateli, 2013, no. 27, pp. 52–53. (In Russ.).

[20] Avgustinovich V.G., Kuznetsova T.A., Sultanov R.R. The identification of compressors’ pre-surge effects for use in an adaptive gas-turbine engine control system. Vestnik Permskogo natsional’nogo issledovatel’skogo politekhnicheskogo universiteta. Aerokosmicheskaya tekhnika [PNRPU Aerospace Engineering Bulletin], 2016, no. 46, pp. 126–143, doi: https://doi.org/10.15593/2224-9982/2016.46.07 (in Russ.).

[21] Shabliy L.S., Kolmakova D.A., Krivtsov A.V. Parametric modeling of blade machines during optimization. Izvestiya Samarskogo nauchnogo tsentra RAN [Izvestia RAS SamSC], 2013, t. 15, no. 6-4, pp. 1013–1018. (In Russ.).

[22] Korsov Yu.G., Tarabrin A.P., eds. Razrabotka, issledovanie i dovodka GTU, kompressorov, nagnetateley i ikh elementov [Design and adjustment of a gas turbine unit, compressor, injector and their elements]. Leningrad, NPO TsKTI Publ., 1990. 161 p. (In Russ.).

[23] Ferroudji F., Cherif K. Structural strength analysis and fabrication of a straight blade for a H-Darrieus wind turbine. J. Appl. Comput. Mech., 2020, vol. 7, no. 3, pp. 1276–1282, doi: https://dx.doi.org/10.22055/jacm.2020.31452.1876

[24] Xu W., Du X., Wang S. Correlation of solidity and curved blade in compressor cascade design. Appl. Therm. Eng., 2018, vol. 131, pp. 244–259, doi: https://doi.org/10.1016/j.applthermaleng.2017.12.003

[25] Vorob’yev Yu.S., Romanenko V.N., Chugay M.A. [Development of 3D FEM setting for analysis of stress-strain state and vibrational characteristics of turbomachine elements]. Dinamika, nadezhnost’ i dolgovechnost’ mekhanicheskikh i biomekhanicheskikh sistem, a takzhe elementov ikh konstruktsiy. Mat. mezhd. nauch.- tekh. konf. [Dynamics, Reliability and Durability of Mechanical and Biomechanical Systems and Elements of Their Constructions. Proc. Int. Sci. Diss.]. Sevastopol’, SevNTU Publ., 2008, pp. 17–25. (In Russ.).

[26] Sedunin V.A., Nuss A.S., Serkov S.A. Studying the strength characteristics of axial compressor blades. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mechan. Eng.], 2016, no. 3, pp. 90–99, doi: http://dx.doi.org/10.18698/0236-3941-2016-3-90-99 (in Russ.).

[27] Klimenda F., Soukup J. Modal analysis of thin aluminium plate. Procedia Eng., 2017, vol. 177, pp. 11–16, doi: https://doi.org/10.1016/j.proeng.2017.02.176

[28] Nikhamkin M.Sh., Chernyaev A.I., Semenov S.V. Rotor system reliability indexes estimation method based on statistical modeling vibrations. Vestnik Permskogo natsional’nogo issledovatel’skogo politekhnicheskogo universiteta. Aerokosmicheskaya tekhnika [PNRPU Aerospace Engineering Bulletin], 2016, no. 47, pp. 198–213, doi: https://doi.org/10.15593/2224-9982/2016.47.11 (in Russ.).

[29] Krivosheev I.A., Rozhkov K.E. Development of methods for the analysis and calculation of cascade performances of axial-flow compressors. Vestnik IrGTU [Proceedings of Irkutsk State Technical University], 2012, no. 2, pp. 26–32. (In Russ.).

[30] Boyko L.G., Kislov O.V., Pizhankova N.V. Turboshaft engine thermogasdynamic parameters calculation method blade-to blade description turbomashines based. Part 1. Main equations. Aviatsionno-kosmicheskaya tekhnika i tekhnologiya [Aerospace Technic and Technology], 2018, no. 1, pp. 48–58, doi: https://doi.org/10.32620/aktt.2018.1.05 (in Russ.).

[31] Boyko L.G., Demin A.E., Pizhankova N.V. Turboshaft engine thermogasdynamic parameters calculation method based on blade-to blade description of turbomashines. Part II. Stage and multistage compressors parameters determination. Aviatsionno-kosmicheskaya tekhnika i tekhnologiya [Aerospace Technic and Technology], no. 1, pp. 18–28, doi: https://doi.org/10.32620/aktt.2019.1.02 (in Russ.).

[32] Dvirnik Ya.V., Pavlenko D.V. Effect of dust erosion on gas-dynamics characteristics of an axial compressor of gas-turbine engine. Vestnik dvigatelestroeniya, 2017, no. 1, pp. 56–66. (In Russ.).

[33] Qiushi L.I., Simin L.I., Pan T. Effects of the radial blade loading distribution and B, parameter on the type of flow instability in a low-speed axial compressor. Chin. J. Aeronaut., 2018, vol. 31, no. 7, pp. 1470–1479, doi: https://doi.org/10.1016/j.cja.2018.05.003

[34] Schobeiri M.T., Attia M. Active control of compressor instability and surge by stator blades adjustment. J. Propul. Power, 2003, vol. 19, no. 2, pp. 312–317, doi: https://doi.org/10.2514/2.6113