Research of Flow Field and Temperature Field in 2D Annular Space of Air-Gap

Tang, Lu; Lü, Yi; Deng, Hai Yan; Wang, Zuo Min

doi:10.4028/www.scientific.net/amm.214.76

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…What will be researched in this paper is about the characteristics of ink flowing. It is an issue of flowing of fluid, so the ink flowing can be considered as incompressible viscous flow and the calculation model adopts the incompressible Navier-Stokes equation [8,9] .…”

Section: Characteristics Analysis Of Ink Transferring and Experimenta...mentioning

confidence: 99%

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Research of Transferring Characteristics of Ink among Rollers

Chu

Zhang

et al. 2014

AMM

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In order to improve the printing quality and know the process of ink transferring well, ink flowing among ink rollers is simulated by using CFX. Firstly ink transferring characteristics between two rollers are analyzed. An experiment is carried out to test the accuracy of this simulation analysis. Then ink transferring characteristics among three and five rollers are analyzed respectively. The general characteristics of ink transferring among rollers are got by comparing the velocity of ink flowing, ink pressure and ink transfer ratio from those simulations. What is more, the accuracy of the simulation analysis is verified by experiment. And this research provides a reference to general characteristics of ink transferring in the actual printing process, and its important for the printing color quality control and has a better application prospect.

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Section: Characteristics Analysis Of Ink Transferring and Experimenta...mentioning

confidence: 99%

“…Part II shown in Fig. 1 is the ink distribution part, and it is mainly composed of ink vibrators (3,4,5), distributing rollers (6,8) and heavy rollers (7,9). The distributing rollers are soft rollers, while the ink vibrators and heavy rollers are hard rollers, and hard rollers and soft rollers are arranged alternately.…”

Section: Introductionmentioning

confidence: 99%

Research of Transferring Characteristics of Ink among Rollers

Chu

Zhang

et al. 2014

AMM

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“…In the air gap, the spent cooling air from rotor and stator meets and interacts with rotating and stationary geometries. Han et al, [2], Tang et al, [3] and Mayle et al, [4] investigated flow characteristics and thermal characteristics in the air gap for an aircooled turbine generator using numerical and experimental methods. The end winding has complicated configuration connecting the stator bars in multiple locations.…”

Section: Introductionmentioning

confidence: 99%

Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator

Jeon¹,

Son²,

Yang³

2020

Preprint

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Turbine generator operates with complex cooling system due to the challenge in controlling the peak temperature of the stator bar caused by ohm loss, which is unavoidable. Therefore, it is important to characterise and quantifies the thermal performance of the cooling system. The focus of the present research is to investigate the heat transfer and pressure loss characteristics of typical cooling system, so-called stator ventilation duct. A real scale model was built at its operating conditions for the present study. The direction of cooling air is varied to consider its operation condition, so that there are (1) outward flow and (2) inward flow cases. In addition, the effect of (3) cross flow (inward with cross flow case) is also studied. The transient heat transfer method using thermochromic liquid crystals is implemented to measure full surface heat transfer distribution. A series of Computational Fluid Dynamics analysis is also conducted to support the observation from the experiment. For the inward flow case, the results suggest that the average Nusselt number of the 2nd duct is about 30% higher than the 3rd duct. The trend is similar with the effect of cross flow. The CFD results are in good agreement with the experimental data.

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“…It forms so-called Taylor-Couette flow. Tang et al [5] focused on the flow and heat transfer in the air gap region, but the approach was limited in the 2D annular model. Mayle et al [6] conducted numerical and also experimental study using a model generator with and without rotor cooling flow injection.…”

Section: Introductionmentioning

confidence: 99%

Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator

et al. 2020

View full text Add to dashboard Cite

Turbine generators operate with complex cooling systems due to the challenge in controlling the peak temperature of the stator bar caused by Ohm loss, which is unavoidable. Therefore, it is important to characterize and quantify the thermal performance of the cooling system. The focus of the present research is to investigate the heat transfer and pressure loss characteristics of a typical cooling system, the so-called stator ventilation duct. A real scale model was built at its operating conditions for the present study. The direction of cooling air was varied to consider its operation condition, so that there are: (1) outward flow; and (2) inward flow cases. In addition, the effect of (3) cross flow (inward with cross flow case) was also studied. The transient heat transfer method using thermochromic liquid crystals is implemented to measure full surface heat transfer distribution. A series of computational fluid dynamics (CFD) analyses were also conducted to support the observation from the experiment. For the outward flow case, the results suggest that the average Nusselt numbers of the 2nd and 3rd ducts are at maximum 100% and 30% higher, respectively, than the inward flow case. The trend was similar with the effect of cross flow. The CFD results were in good agreement with the experimental data.

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Research of Flow Field and Temperature Field in 2D Annular Space of Air-Gap

Cited by 3 publications

References 3 publications

Research of Transferring Characteristics of Ink among Rollers

Research of Transferring Characteristics of Ink among Rollers

Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator

Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator

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