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Weili L.,Beijing Jiaotong University | Jichao H.,Harbin University of Science and Technology | Xingfu Z.,Harbin University of Science and Technology | Yong L.,Beijing BEIZHONG Steam Turbine Generator Co.
IEEE Transactions on Industrial Electronics | Year: 2013

According to the complex structure characteristics of a 330-MW water-hydrogen-hydrogen-cooled turbogenerator, the flow network within a half-axial segment of the generator was established. The total flow rate, pressure, flow rates of various ventilation ducts, and the chambers in the generator were obtained after solving the equations of the flow network. The 3-D transient electromagnetic field in the generator end was calculated, and the eddy-current losses of the end parts were gained. Using the finite volume method, the fluid and thermal mathematic and physical models for the whole end region were given. The flow velocity and the pressure values from the flow-network calculations were applied to the end region as boundary conditions, and the losses measured from electromagnetic field calculations were applied to the end parts as heat sources in the temperature field. Thus, both the distribution of the temperature of the end parts and the distribution of the fluid flow in the whole end region were obtained under rated operating conditions. Comparing the calculated temperature results with the test values, the errors meet the engineering requirement. All of the aforementioned data will provide an effective basis for accurately calculating the temperature of the end parts in a large turbogenerator. © 1982-2012 IEEE.


Li W.,Beijing Jiaotong University | Zhou X.,Harbin University of Science and Technology | Huo F.,Beijing Jiaotong University | Li Y.,Beijing BEIZHONG Steam Turbine Generator Co. | Han J.,Harbin University of Science and Technology
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

According to the features of ventilation structure in 330 MW water-hydrogen-hydrogen cooled turbo-generator, the ventilation network model of half axial section was built, the total flow, the flow and the pressure of the ventilation ducts and the wind chambers were obtained with the fluid network method. To validate the accuracy of calculation with fluid network method, three-dimensional flow-heat transfer coupling model of end region was established. The flow velocity and the pressure from the ventilation system calculations were applied to the physical model of end region as boundary conditions, the distribution of the temperature on the copper shield was obtained with the finite volume method under rated operating conditions. Comparing the calculated temperature results with the test values, the errors meet the engineering requirement. Based on these, the change of temperature on the copper shield was analyzed by adjusting the flowing area of the ventilation duct between the copper shield and the press plate. All of the aforementioned will provide an effective basis for designing the structure of a large turbo-generator accurately. © 2013 Chinese Society for Electrical Engineering.


Han J.,Harbin University of Science and Technology | Li W.,Beijing Jiaotong University | Wang L.,Harbin University of Science and Technology | Zhou X.,Shanghai Institute of Technology | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2014

With increased turbogenerator capacity and electromagnetic load, overheating of the complex end parts has become one of the main problems affecting safe and stable turbogenerator operation. In this research, a flow network was built representing the structural and ventilation characteristics of a 330-MW turbogenerator. The fan inlet velocity and pressures (boundary conditions) of each end-region outlet were obtained by the flow network method. The 3-D transient electromagnetic field in the turbogenerator end was calculated, and the eddy current losses (heat sources) of the end parts were obtained by the finite-element method. To study the surface heat-transfer coefficient distribution on the stator-end winding surface, fluid and thermal mathematical and geometric models of the whole turbogenerator end region were given. Using the finite-volume method, the surface heat-transfer coefficient distribution on the complex 3-D stator-end winding surface, fluid-flow distribution, and temperature distribution of the end parts were investigated under rated-load conditions. The calculated temperature results match well with measured data. This research can provide a theoretical basis for calculating the heat-transfer coefficients of the outer surfaces of large turbogenerators. © 1982-2012 IEEE.


Han J.,Harbin University of Science and Technology | Li W.,Beijing Jiaotong University | Li Y.,Beijing BEIZHONG Steam Turbine Generator Co.
IEEE Transactions on Industrial Electronics | Year: 2015

Distribution of complex fluid flow is an important factor that affects the temperature distribution of the end parts in the end region of a turbogenerator. In this paper, a turbogenerator is considered as an example; the fluid flow velocity and pressure values obtained from flow network calculations are applied to the end region as boundary conditions, and the losses obtained from electromagnetic field calculations are applied to the end region as heat sources in a fluid and thermal coupling field. Furthermore, mathematical and geometric models of 3-D fluid and thermal coupling of the end region are established. The distributions of the complex fluid velocity and fluid temperature in the turbogenerator end region are investigated in detail. Moreover, the temperature distribution of the end parts is determined. Comparison of measurement results of the temperature of the end parts with the corresponding calculation results shows their good agreement. © 1982-2012 IEEE.


Huo F.,Beijing Jiaotong University | Li W.,Beijing Jiaotong University | Wang L.,Harbin University of Science and Technology | Zhang Y.,Beijing Jiaotong University | And 2 more authors.
IEEE Transactions on Industrial Electronics | Year: 2014

Due to the complexity of the structures and magnetic field distribution in the end region of large turbogenerators, using a 330-MW water-hydrogen-hydrogen cooled turbogenerator as an example, the 3-D mathematical and geometry models of the nonlinear transient eddy current field were given. Taking the nonlinearity of the core material and the influences of noncontact between the copper screen and the clamping plate, as well as the shape of stator end windings into consideration, the 3-D transient electromagnetic field was calculated, and the losses of different metal parts were obtained by the finite-element method. The calculated power losses were applied to the thermal field as heat sources. Temperatures of the copper screen were gained. The calculated results of copper screen were well coincident with the test data. Hence, the calculated results are accurate, and the method of calculation is effective. © 1982-2012 IEEE.

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