Enstrophy Study of the Turbulent Swirling Flow in Pipe
Нема приказа
2023
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Turbulent swirling flow is characterized by significant vortex fluctuations, intensive diffusion processes and energy cascade transfer from larger to smaller vortices over a continuous spectrum of wave numbers. The dissipation of the kinetic energy of turbulence occurs in the smallest vortices, because in these areas, both the velocity gradients and the deformation velocities are the largest. In this paper is analyzed turbulent swirling flow in pipe, generated by the axial fan impellers for three various blade angles (22°, 26° and 30°). Vorticity, enstrophy and lambda 2 values are calculated in order to study the structure of the generated turbulent swirling flows. Axial fan impeller operates in the region of lower flow rates, and it is shown that blade angle doesn’t influence much on the integral flow parameters, as well as on the enstrophy distribution. It is, also, shown that the dissipation of the kinetic energy of turbulence is associated with the vorticity fluctuations, i.e. with... turbulent fluctuating enstrophy. All these distributions are obtained by use of the high speed particle image velocimetry data and provided velocity fields. Enstrophy is directly related to the kinetic energy, i.e. it corresponds to dissipation effects in this flow. It has maximum in small vortices, i.e. in shear layer, that surrounds vortex core region, where the process of turbulence kinetic energy dissipation occurs.
Кључне речи:
turbulence / swirling flow / axial fan / vorticity / enstrophy / high speed particle image velocimetryИзвор:
9th International Congress of the Serbian Society of Mechanics July 5-7, 2023, Vrnjačka Banja, Serbia, 2023, 84-Издавач:
- Српско друштво за механику
Финансирање / пројекти:
- Примена савремених мерних и прорачунских техника за изучавање струјних параметара вентилационих система на моделу енергетски изузетно ефикасног (пасивног) објекта (RS-MESTD-Technological Development (TD or TR)-35046)
- German Academic Exchange Service (DAAD) (Bilateral Project, Karlsruhe Institute of Technology, Institute of Fluid Machinery, Germany and Faculty of Mechanical Engineering, University of Belgrade, Serbia, in period 2011-2012)
URI
http://www.ssm.kg.ac.rs/congress_2023/papers/https://machinery.mas.bg.ac.rs/handle/123456789/6911
http://www.ssm.kg.ac.rs/congress_2023/wp-content/uploads/upload/ICSSM2023_Book_of_Proceedings.pdf
Колекције
Институција/група
Mašinski fakultetTY - CONF AU - Čantrak, Đorđe AU - Janković, Novica AU - Ilić, Dejan AU - Lečić, Lazar PY - 2023 UR - http://www.ssm.kg.ac.rs/congress_2023/papers/ UR - https://machinery.mas.bg.ac.rs/handle/123456789/6911 UR - http://www.ssm.kg.ac.rs/congress_2023/wp-content/uploads/upload/ICSSM2023_Book_of_Proceedings.pdf AB - Turbulent swirling flow is characterized by significant vortex fluctuations, intensive diffusion processes and energy cascade transfer from larger to smaller vortices over a continuous spectrum of wave numbers. The dissipation of the kinetic energy of turbulence occurs in the smallest vortices, because in these areas, both the velocity gradients and the deformation velocities are the largest. In this paper is analyzed turbulent swirling flow in pipe, generated by the axial fan impellers for three various blade angles (22°, 26° and 30°). Vorticity, enstrophy and lambda 2 values are calculated in order to study the structure of the generated turbulent swirling flows. Axial fan impeller operates in the region of lower flow rates, and it is shown that blade angle doesn’t influence much on the integral flow parameters, as well as on the enstrophy distribution. It is, also, shown that the dissipation of the kinetic energy of turbulence is associated with the vorticity fluctuations, i.e. with turbulent fluctuating enstrophy. All these distributions are obtained by use of the high speed particle image velocimetry data and provided velocity fields. Enstrophy is directly related to the kinetic energy, i.e. it corresponds to dissipation effects in this flow. It has maximum in small vortices, i.e. in shear layer, that surrounds vortex core region, where the process of turbulence kinetic energy dissipation occurs. PB - Српско друштво за механику C3 - 9th International Congress of the Serbian Society of Mechanics July 5-7, 2023, Vrnjačka Banja, Serbia T1 - Enstrophy Study of the Turbulent Swirling Flow in Pipe SP - 84 UR - https://hdl.handle.net/21.15107/rcub_machinery_6911 ER -
@conference{ author = "Čantrak, Đorđe and Janković, Novica and Ilić, Dejan and Lečić, Lazar", year = "2023", abstract = "Turbulent swirling flow is characterized by significant vortex fluctuations, intensive diffusion processes and energy cascade transfer from larger to smaller vortices over a continuous spectrum of wave numbers. The dissipation of the kinetic energy of turbulence occurs in the smallest vortices, because in these areas, both the velocity gradients and the deformation velocities are the largest. In this paper is analyzed turbulent swirling flow in pipe, generated by the axial fan impellers for three various blade angles (22°, 26° and 30°). Vorticity, enstrophy and lambda 2 values are calculated in order to study the structure of the generated turbulent swirling flows. Axial fan impeller operates in the region of lower flow rates, and it is shown that blade angle doesn’t influence much on the integral flow parameters, as well as on the enstrophy distribution. It is, also, shown that the dissipation of the kinetic energy of turbulence is associated with the vorticity fluctuations, i.e. with turbulent fluctuating enstrophy. All these distributions are obtained by use of the high speed particle image velocimetry data and provided velocity fields. Enstrophy is directly related to the kinetic energy, i.e. it corresponds to dissipation effects in this flow. It has maximum in small vortices, i.e. in shear layer, that surrounds vortex core region, where the process of turbulence kinetic energy dissipation occurs.", publisher = "Српско друштво за механику", journal = "9th International Congress of the Serbian Society of Mechanics July 5-7, 2023, Vrnjačka Banja, Serbia", title = "Enstrophy Study of the Turbulent Swirling Flow in Pipe", pages = "84", url = "https://hdl.handle.net/21.15107/rcub_machinery_6911" }
Čantrak, Đ., Janković, N., Ilić, D.,& Lečić, L.. (2023). Enstrophy Study of the Turbulent Swirling Flow in Pipe. in 9th International Congress of the Serbian Society of Mechanics July 5-7, 2023, Vrnjačka Banja, Serbia Српско друштво за механику., 84. https://hdl.handle.net/21.15107/rcub_machinery_6911
Čantrak Đ, Janković N, Ilić D, Lečić L. Enstrophy Study of the Turbulent Swirling Flow in Pipe. in 9th International Congress of the Serbian Society of Mechanics July 5-7, 2023, Vrnjačka Banja, Serbia. 2023;:84. https://hdl.handle.net/21.15107/rcub_machinery_6911 .
Čantrak, Đorđe, Janković, Novica, Ilić, Dejan, Lečić, Lazar, "Enstrophy Study of the Turbulent Swirling Flow in Pipe" in 9th International Congress of the Serbian Society of Mechanics July 5-7, 2023, Vrnjačka Banja, Serbia (2023):84, https://hdl.handle.net/21.15107/rcub_machinery_6911 .