INTEGRAL AND STATISTICAL CHARACTERISTICS OF THE TURBULENT SWIRL FLOW IN A STRAIGHT CONICAL DIFFUSER
Апстракт
The results of the experimental investigations of the turbulent swirl flow in a straight conical diffuser with inlet diameter 0.4 m and total divergence angle 8.6 degrees are presented in this paper. The incompressible swirl flow field is generated by the axial fan with outer diameter 0.397 m. The measurements were performed in one measuring section downstream the axial fan impeller in the conical diffuser in position (z/R-0 = 1) with original classical probes and an one-component laser Doppler anemometry (LDA) system, for four flow regimes. The comparative measurements of axial and circumferential velocities are presented. The Reynolds number, calculated on the basis of the average velocity, ranges from 149857 to 216916. Integral parameters, such as volume flow rate, average circulation and swirl number, are determined. Statistical characteristics, such as level of turbulence, skewness and flatness factors, are calculated. The highest levels of turbulence for axial velocity are reache...d in region 0.4 lt r/R lt 0.6, where D = 2R. The highest levels of turbulence for circumferential velocity are reached for the regimes with lower circulation in r/R approximate to 0.4, i.e., in the vortex core region for the cases with higher circulation.
Кључне речи:
turbulence / statistics / swirl flow / axial fan / diffuser / LDAИзвор:
Theoretical and Applied Mechanics, 2018, 45, 2, 127-137Издавач:
- Srpsko društvo za mehaniku, Beograd
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)
- MESTD, Serbia
- Bilateral cooperation between MESTD, Serbia and Ministry of Science, Montenegro (2016-2018), coordinated between the University of Belgrade, Faculty of Mechanical Engineering and the University of Montenegro, Faculty of Mechanical Engineering "Investigation of the influence of turbulent swirl flow on the energy parameters of the axial fans by use of the contemporarymeasurement techniques".
DOI: 10.2298/TAM171201012I
ISSN: 1450-5584
WoS: 000455467700001
Scopus: 2-s2.0-85063037529
Колекције
Институција/група
Mašinski fakultetTY - JOUR AU - Ilić, Dejan AU - Čantrak, Đorđe AU - Janković, Novica PY - 2018 UR - https://machinery.mas.bg.ac.rs/handle/123456789/2821 AB - The results of the experimental investigations of the turbulent swirl flow in a straight conical diffuser with inlet diameter 0.4 m and total divergence angle 8.6 degrees are presented in this paper. The incompressible swirl flow field is generated by the axial fan with outer diameter 0.397 m. The measurements were performed in one measuring section downstream the axial fan impeller in the conical diffuser in position (z/R-0 = 1) with original classical probes and an one-component laser Doppler anemometry (LDA) system, for four flow regimes. The comparative measurements of axial and circumferential velocities are presented. The Reynolds number, calculated on the basis of the average velocity, ranges from 149857 to 216916. Integral parameters, such as volume flow rate, average circulation and swirl number, are determined. Statistical characteristics, such as level of turbulence, skewness and flatness factors, are calculated. The highest levels of turbulence for axial velocity are reached in region 0.4 lt r/R lt 0.6, where D = 2R. The highest levels of turbulence for circumferential velocity are reached for the regimes with lower circulation in r/R approximate to 0.4, i.e., in the vortex core region for the cases with higher circulation. PB - Srpsko društvo za mehaniku, Beograd T2 - Theoretical and Applied Mechanics T1 - INTEGRAL AND STATISTICAL CHARACTERISTICS OF THE TURBULENT SWIRL FLOW IN A STRAIGHT CONICAL DIFFUSER EP - 137 IS - 2 SP - 127 VL - 45 DO - 10.2298/TAM171201012I ER -
@article{ author = "Ilić, Dejan and Čantrak, Đorđe and Janković, Novica", year = "2018", abstract = "The results of the experimental investigations of the turbulent swirl flow in a straight conical diffuser with inlet diameter 0.4 m and total divergence angle 8.6 degrees are presented in this paper. The incompressible swirl flow field is generated by the axial fan with outer diameter 0.397 m. The measurements were performed in one measuring section downstream the axial fan impeller in the conical diffuser in position (z/R-0 = 1) with original classical probes and an one-component laser Doppler anemometry (LDA) system, for four flow regimes. The comparative measurements of axial and circumferential velocities are presented. The Reynolds number, calculated on the basis of the average velocity, ranges from 149857 to 216916. Integral parameters, such as volume flow rate, average circulation and swirl number, are determined. Statistical characteristics, such as level of turbulence, skewness and flatness factors, are calculated. The highest levels of turbulence for axial velocity are reached in region 0.4 lt r/R lt 0.6, where D = 2R. The highest levels of turbulence for circumferential velocity are reached for the regimes with lower circulation in r/R approximate to 0.4, i.e., in the vortex core region for the cases with higher circulation.", publisher = "Srpsko društvo za mehaniku, Beograd", journal = "Theoretical and Applied Mechanics", title = "INTEGRAL AND STATISTICAL CHARACTERISTICS OF THE TURBULENT SWIRL FLOW IN A STRAIGHT CONICAL DIFFUSER", pages = "137-127", number = "2", volume = "45", doi = "10.2298/TAM171201012I" }
Ilić, D., Čantrak, Đ.,& Janković, N.. (2018). INTEGRAL AND STATISTICAL CHARACTERISTICS OF THE TURBULENT SWIRL FLOW IN A STRAIGHT CONICAL DIFFUSER. in Theoretical and Applied Mechanics Srpsko društvo za mehaniku, Beograd., 45(2), 127-137. https://doi.org/10.2298/TAM171201012I
Ilić D, Čantrak Đ, Janković N. INTEGRAL AND STATISTICAL CHARACTERISTICS OF THE TURBULENT SWIRL FLOW IN A STRAIGHT CONICAL DIFFUSER. in Theoretical and Applied Mechanics. 2018;45(2):127-137. doi:10.2298/TAM171201012I .
Ilić, Dejan, Čantrak, Đorđe, Janković, Novica, "INTEGRAL AND STATISTICAL CHARACTERISTICS OF THE TURBULENT SWIRL FLOW IN A STRAIGHT CONICAL DIFFUSER" in Theoretical and Applied Mechanics, 45, no. 2 (2018):127-137, https://doi.org/10.2298/TAM171201012I . .