Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity

In this paper, to study the effect of dynamic and static interference of clearance flow in fluid machinery caused by changes in rotational speed, the model was simplified to a rotor-stator system cavity flow. Investigating the flow characteristics in the cavity by changing the rotor speed of the rot...

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Autores principales:	Zhizhou Zhao, Wenwu Song, Yongxin Jin, Jiaxing Lu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	rotor-stator system clearance flow Reynolds stress vortex structure torque coefficient Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/31250c8668b442c7b1270b4565907e31
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id	oai:doaj.org-article:31250c8668b442c7b1270b4565907e31
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spelling	oai:doaj.org-article:31250c8668b442c7b1270b4565907e312021-11-25T16:42:47ZEffect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity10.3390/app1122110002076-3417https://doaj.org/article/31250c8668b442c7b1270b4565907e312021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/11000https://doaj.org/toc/2076-3417In this paper, to study the effect of dynamic and static interference of clearance flow in fluid machinery caused by changes in rotational speed, the model was simplified to a rotor-stator system cavity flow. Investigating the flow characteristics in the cavity by changing the rotor speed of the rotor-stator system is of considerable significance. ANSYS-CFX was applied to numerically simulate the test model and the results were compared with the experimental results of the windage torque of the rotor-stator system. The inlet flow rate and geometric model remained unchanged. With an increase in the rotating Reynolds number, the shear stress on the rotor wall gradually increased, and the maximum gradient was within <i>l</i><sup>*</sup> < 0.15. In addition to the shear stress, the tangential Reynolds stress <i>R</i><sub>rθ</sub> contributed partly to the torque on the rotor wall. The swirling vortex formed by entrainment in the cavity of the rotor-stator system tended to separate at <i>Re</i><sub>Φ</sub>= 3.53 × 10<sup>6</sup>. As the rotating Reynolds number continued to increase, the secondary vortex finally separated completely. The strength of the vortex in the rotor turbulent boundary layer decreased with an increase in the rotating speed, but the number of vortex cores increased with the increase of speed. Depending on the application of the fluid machine, controlling the rotating speed within a reasonable range can effectively improve the characteristics of the clearance flow.Zhizhou ZhaoWenwu SongYongxin JinJiaxing LuMDPI AGarticlerotor-stator systemclearance flowReynolds stressvortex structuretorque coefficientTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 11000, p 11000 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	rotor-stator system clearance flow Reynolds stress vortex structure torque coefficient Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	rotor-stator system clearance flow Reynolds stress vortex structure torque coefficient Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Zhizhou Zhao Wenwu Song Yongxin Jin Jiaxing Lu Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity
description	In this paper, to study the effect of dynamic and static interference of clearance flow in fluid machinery caused by changes in rotational speed, the model was simplified to a rotor-stator system cavity flow. Investigating the flow characteristics in the cavity by changing the rotor speed of the rotor-stator system is of considerable significance. ANSYS-CFX was applied to numerically simulate the test model and the results were compared with the experimental results of the windage torque of the rotor-stator system. The inlet flow rate and geometric model remained unchanged. With an increase in the rotating Reynolds number, the shear stress on the rotor wall gradually increased, and the maximum gradient was within <i>l</i><sup>*</sup> < 0.15. In addition to the shear stress, the tangential Reynolds stress <i>R</i><sub>rθ</sub> contributed partly to the torque on the rotor wall. The swirling vortex formed by entrainment in the cavity of the rotor-stator system tended to separate at <i>Re</i><sub>Φ</sub>= 3.53 × 10<sup>6</sup>. As the rotating Reynolds number continued to increase, the secondary vortex finally separated completely. The strength of the vortex in the rotor turbulent boundary layer decreased with an increase in the rotating speed, but the number of vortex cores increased with the increase of speed. Depending on the application of the fluid machine, controlling the rotating speed within a reasonable range can effectively improve the characteristics of the clearance flow.
format	article
author	Zhizhou Zhao Wenwu Song Yongxin Jin Jiaxing Lu
author_facet	Zhizhou Zhao Wenwu Song Yongxin Jin Jiaxing Lu
author_sort	Zhizhou Zhao
title	Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity
title_short	Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity
title_full	Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity
title_fullStr	Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity
title_full_unstemmed	Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity
title_sort	effect of rotational speed variation on the flow characteristics in the rotor-stator system cavity
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/31250c8668b442c7b1270b4565907e31
work_keys_str_mv	AT zhizhouzhao effectofrotationalspeedvariationontheflowcharacteristicsintherotorstatorsystemcavity AT wenwusong effectofrotationalspeedvariationontheflowcharacteristicsintherotorstatorsystemcavity AT yongxinjin effectofrotationalspeedvariationontheflowcharacteristicsintherotorstatorsystemcavity AT jiaxinglu effectofrotationalspeedvariationontheflowcharacteristicsintherotorstatorsystemcavity
_version_	1718413009739579392

Effect of Rotational Speed Variation on the Flow Characteristics in the Rotor-Stator System Cavity

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