Full surface heat transfer characteristics of rotor ventilation duct of a turbine generator

Yoo, Wonkyung; Jeon, Seol; Son, Changmin; Yang, Jangsik; Ahn, Daihyun; Kim, Sung-Ha; Hwang, Kyeha; Ha, Sunghoon

doi:10.1016/j.applthermaleng.2015.10.025

Cited by 29 publications

(8 citation statements)

References 5 publications

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“…Transient heat transfer technique using thermochromic liquid crystals (TLC) are applied to measure fill surface heat transfer distribution. The experimental technique is well developed over decades and documented [1,[21][22][23]. The one-dimensional semi-infinite heat conduction equation was used to evaluate the local surface temperature; suitable boundary conditions must be applied for the heat conduction model to be valid [24].…”

Section: Experimental Model and Approachmentioning

confidence: 99%

“…There was much effort to investigate the complex cooling system of turbine generator. Yoo et al, [1] reported the detail heat transfer and pressure loss characteristics of rotor ventilation duct applying experimental and CFD approaches. In the air gap, the spent cooling air from rotor and stator meets and interacts with rotating and stationary geometries.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Experimental Model and Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Jeon¹,

Son²,

Yang³

2020

Preprint

Self Cite

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show abstract

“…The predicted results highlight the flow interaction in the air gap and the formation of swirling flow. Yoo et al [4] reported the detailed heat transfer and pressure loss characteristics of a rotor ventilation duct applying experimental and CFD approaches. The stationary measurements were also compared with CFD prediction in a rotating frame showing Coriolis force-induced secondary flow in the rotor ventilation duct.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

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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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“…Zhang Zhenhai et al made a numerical analysis of fluid distribution in cage induction wind turbines by using fluid flow knowledge, and discussed the influence of the axial ventilation ducts number of rotor on the uniform distribution of flow and velocity in the motor [7]. Yoo Wookyung et al studied the fluid flow and heat transfer in the ventilation system of the generator rotor, and analyzed the influence of three different states on the heat transfer of the rotor [8]. Li Guangyu et al optimized the centrifugal fan of high-voltage motor, and gave the optimization result of the external fan and its characteristic curve [9].…”

Section: Introductionmentioning

confidence: 99%

Research on Thermal Characteristics of Internal Ventilated Paths in Compact Medium High- Voltage Motor Based Fluid Network Decoupling

Yang

et al. 2019

IEEE Access

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Aiming at the problem that it is difficult to model and analyze the thermal effect of large motors as a whole, a method based on fluid network decoupling is proposed to solve the global thermal effect of large motors. Taking YJKK500-4 2500-kW compact medium-sized high-voltage motor as an example, combined with the internal structure and the actual size of the motor, and using the flow-heat coordination mechanism and the fluid network, the whole internal ventilated paths of motor are divided into four equal pressure regions: end, stator-rotor, end, and internal fan according to the magnitude of pressure. The reasonable basic assumptions and boundary conditions are selected to link each region, which can avoid the problem that the inlet boundary condition is difficult to give. After that, the internally ventilated paths are modeled and analyzed, and the fluid flow and temperature in each region of the internally ventilated paths are obtained. Combined with the experimental data, the calculation results are all within the error. The rationality and correctness of the method used in the paper are confirmed, which solves the problem that the ordinary computer cannot calculate the huge model of large motor and provides a basis for the calculation of similar motor in the future. INDEX TERMS YJKK compact medium high-voltage motor (YJKK), fluid network decoupling, internal ventilated paths, fluid characteristics, thermal effect.

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Full surface heat transfer characteristics of rotor ventilation duct of a turbine generator

Cited by 29 publications

References 5 publications

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

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

Research on Thermal Characteristics of Internal Ventilated Paths in Compact Medium High- Voltage Motor Based Fluid Network Decoupling

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