Influence of Cooling Fluid Parameter on the Fluid Flow and End Part Temperature in End Region of a Large Turbogenerator

Han, Je-Chin; Ge, Baojun; Tao, Dajun; Li, Wei Li

doi:10.1109/tec.2015.2504482

Cited by 19 publications

(11 citation statements)

References 25 publications

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“…According to the calculated values shown in Fig.5 and Fig.6, respectively, the starting current ratio (I * st ) and the rotating speed (n) are then fitted by (5) and (6). The fitted values of the starting current and rotating speed are also…”

Section: Transient Heat Sourcementioning

confidence: 99%

“…Li et al [4] proposed an electromagnetic-thermal optimization method to reduce the winding temperature rise of a permanent magnet brushless DC motor working in the short-time duty, but the coupling between thermal behavior and fluid motion is not taken into account. Han et al [5], [6] built a 3D model of a large turbo generator and calculated the end part temperature. They also discussed the fluid flow and temperature when the turbo generator ran from the start to the steady-state operation [5], [6].…”

Section: Introductionmentioning

confidence: 99%

“…Han et al [5], [6] built a 3D model of a large turbo generator and calculated the end part temperature. They also discussed the fluid flow and temperature when the turbo generator ran from the start to the steady-state operation [5], [6]. The temperature field of electrical machine has gained more and more attention [7]- [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analyzing Temperature Rise and Fluid Flow of High-Power-Density and High-Voltage Induction Motor in the Starting Process

Xia

Han

et al. 2019

IEEE Access

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Transient characteristics in the starting process play an important role in the design and operation of high-power-density and high-voltage induction motor. A field-circuit coupling model is proposed to analyze the transient fluid flow and temperature rise of a YJKK 500-4 2500 kW HPDHV induction motor in the starting process. The wind resistance network model is built to investigate the transient fluid flow and is used to obtain the heat dissipation boundary condition of the transient temperature calculation. The transient electric current is the key to the heat source of the temperature distribution and is calculated by the dynamic mathematical model. According to the obtained heat dissipation boundary condition and heat source, the 3-D fluid-solid coupling model is solved to obtain the transient temperature distribution. Moreover, the highest temperature rise in the starting process is greatly affected by the load. The simulation results show that the smaller fluid flow and the starting current make the winding temperature rise rapidly before the rotating speed of the motor reaches the rated value. When the load is much heavier, the starting time becomes longer and the winding temperature in the starting process will rise rapidly. The experimental results indicate that the proposed model is validated. INDEX TERMS Induction motor, temperature rise, fluid flow, starting characteristic.

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Section: Transient Heat Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analyzing Temperature Rise and Fluid Flow of High-Power-Density and High-Voltage Induction Motor in the Starting Process

Xia

Han

et al. 2019

IEEE Access

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“…However, few of them have paid attention to the loss/temperature variations caused by SAGE or RISC and even fewer to those by the combined faults. Currently, scholars mainly carry out investigations on the impact of the machine structure [11,12], the effect of the material [13][14][15], the influence of the load [16], and the impact of the cooling medium [17][18][19][20] on the loss/temperature rise.…”

Section: Introductionmentioning

confidence: 99%

Rotor loss and temperature variation under single and combined faults composed of static air‐gap eccentricity and rotor inter‐turn short circuit in synchronous generators

Zhang

et al. 2021

IET Electric Power Appl

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In this study, the rotor loss as well as the temperature variations due to the static air-gap eccentricity (SAGE) and the rotor inter-turn short circuit (RISC) in synchronous generators is presented. Different from the previous studies, this study investigates the loss/ temperature changes under not only the single SAGE fault and the single RISC fault but also the combined faults (CF) that are composed of these two single faults. Detailed formula derivation on the hysteresis loss (HL) and the eddy current loss (ECL), together with the rotor temperature rise due to varied fault types and different operating conditions, are first carried out based on a theoretical analysis of the magnetic flux density (MFD) variation. Then, 3-D finite element analysis (FEA) and experimental verifications are performed on a CS-5 prototype generator that has two poles and a rated rotating speed of 3000 rpm. It shows that the occurrence of either SAGE or RISC will increase the rotor loss and temperature. Comparatively, the single RISC fault overweighs the single SAGE fault in the rotor temperature increment, while the combined fault overweighs both of these single faults. In the same fault cases, the rotor temperature will have the highest value under full-load operation.

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“…In a study on the heating and cooling of air-cooled turbo-generators, Han et al investigate the effect of different cooling media [14] and cooling medium parameters [15] on the fluid velocity and temperature distribution in the end region of an air-cooled turbo-generator. In [16], the flow-heat coupling model of an air-cooled turbo-generator is solved by the finite element method, and the influence of the copper shield structure on the overall temperature rise of the generator is revealed.…”

Section: Introductionmentioning

confidence: 99%

Research on Relativity of Flow Rate Distribution Inside the Rotor Domain for a Large-Scale Air-Cooled Turbo-Generator

Ding

Jiang

et al. 2019

IEEE Access

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The main objective of this paper is to elucidate the effect of rotor end structures of a large-scale air-cooled turbo-generator on the flow rate distribution and fluid flow pattern in the rotor domain. A 350 MW fully air-cooled turbo-generator is taken as an example. Based on the original ventilation structure, two optimization schemes of adding wind deflectors and small fans to the end of the rotor are proposed. The finite volume method is used to solve the fluid field in the generator with different rotor end structures. The air volume distribution in each wind area of the generator is taken as the basis for checking the accuracy of the calculation. Under different schemes, the wind path direction, flow rate and fluid velocity distribution in the radial ventilation ducts, subslots and crescent slots of the rotor are compared and analyzed. The effects of these schemes on the overall flow rate distribution and the fluid parameter distribution characteristics in each rotor ventilation ducts are determined. INDEX TERMSAir-cooled turbo-generator, finite volume method, fluid field, rotor, ventilation structure.

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Influence of Cooling Fluid Parameter on the Fluid Flow and End Part Temperature in End Region of a Large Turbogenerator

Cited by 19 publications

References 25 publications

Analyzing Temperature Rise and Fluid Flow of High-Power-Density and High-Voltage Induction Motor in the Starting Process

Analyzing Temperature Rise and Fluid Flow of High-Power-Density and High-Voltage Induction Motor in the Starting Process

Rotor loss and temperature variation under single and combined faults composed of static air‐gap eccentricity and rotor inter‐turn short circuit in synchronous generators

Research on Relativity of Flow Rate Distribution Inside the Rotor Domain for a Large-Scale Air-Cooled Turbo-Generator

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