The Experts below are selected from a list of 1071 Experts worldwide ranked by ideXlab platform
Weili Li - One of the best experts on this subject based on the ideXlab platform.
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erratum to influence of cooling fluid parameter on the fluid flow and end part temperature in end region of a large turbogenerator
IEEE Transactions on Energy Conversion, 2016Co-Authors: Baojun Ge, Weili LiAbstract:In order to study the influence of the cooling fluid parameter on the fluid flow and end part temperature in the end region of the large turbogenerator, a 330-MW water–hydrogen–hydrogen cooled turbogenerator is analyzed. The fluid velocity and pressure values from the flow network calculations are applied to the end region as boundary conditions and the losses obtained from 3-D transient electromagnetic field calculations are applied to the end parts as heat sources in the fluid and thermal coupling analysis. After solving the fluid and thermal equations of fluid–solid conjugated heat transfer, the fluid velocity and end part temperature in the turbogenerator end region are gained under the different cooling fluid parameters. The influence of different fluid velocities and fluid temperatures in the water pipe inlet, and in the fan inlet on the fluid flow and end part temperature in the turbogenerator end region is researched. The calculation results of copper shield temperature are compared with the measured values. The calculation results coincident well with the measured values. These provide the important reference for better cooling turbogenerator end region.
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numerical calculation and analysis of three dimensional transient electromagnetic field in the end region of large water hydrogen hydrogen cooled turbogenerator
IEEE Transactions on Industrial Electronics, 2014Co-Authors: Weili Li, Chunwei Guan, Likun Wang, Yihuang Zhang, Yong LiAbstract: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.
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Influence of Metal Screen Materials on 3-D Electromagnetic Field and Eddy Current Loss in the End Region of Turbogenerator
IEEE Transactions on Magnetics, 2013Co-Authors: Likun Wang, Yong Li, Weili Li, Yihuang Zhang, Chunwei GuanAbstract:Since the structure of a large capacity turbogenerator is complex in the end region, accurate calculation about the leakage magnetic field becomes a key factor in the design. In this paper, a 330-MW level turbogenerator is electromagnetically analyzed and investigated with different metal screens in the end region. Its nonlinear transient electromagnetic field and eddy current loss were calculated by using the time step finite-element method (FEM). The influences of metal screen materials on the electromagnetic field and eddy current loss were compared and analyzed. All of these will contribute to the turbogenerator engineering design. Using the loss gained by the magnetic field calculation as a heat source, the thermal field of the end region with a copper screen was calculated. Compared with the test data, the calculated temperature results match well with the measured data.
Yong Li - One of the best experts on this subject based on the ideXlab platform.
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numerical calculation and analysis of three dimensional transient electromagnetic field in the end region of large water hydrogen hydrogen cooled turbogenerator
IEEE Transactions on Industrial Electronics, 2014Co-Authors: Weili Li, Chunwei Guan, Likun Wang, Yihuang Zhang, Yong LiAbstract: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.
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Influence of Metal Screen Materials on 3-D Electromagnetic Field and Eddy Current Loss in the End Region of Turbogenerator
IEEE Transactions on Magnetics, 2013Co-Authors: Likun Wang, Yong Li, Weili Li, Yihuang Zhang, Chunwei GuanAbstract:Since the structure of a large capacity turbogenerator is complex in the end region, accurate calculation about the leakage magnetic field becomes a key factor in the design. In this paper, a 330-MW level turbogenerator is electromagnetically analyzed and investigated with different metal screens in the end region. Its nonlinear transient electromagnetic field and eddy current loss were calculated by using the time step finite-element method (FEM). The influences of metal screen materials on the electromagnetic field and eddy current loss were compared and analyzed. All of these will contribute to the turbogenerator engineering design. Using the loss gained by the magnetic field calculation as a heat source, the thermal field of the end region with a copper screen was calculated. Compared with the test data, the calculated temperature results match well with the measured data.
Li Weili - One of the best experts on this subject based on the ideXlab platform.
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influence of the end ventilation structure change on the temperature distribution in the end region of large water hydrogen hydrogen cooled turbogenerator
IEEE Transactions on Energy Conversion, 2013Co-Authors: Li Weili, Han Jichao, Zhou Xingfu, Huo Feiyang, Zhang Yihuang, Li YongAbstract:Flow network was built according to the ventilation structural characteristics of a 330 MW large water-hydrogen-hydrogen cooled turbogenerator. The variation of the fan inlet velocities, and the flow rates and pressures (boundary conditions) of each end region outlet were obtained, respectively, with different air gap spacer heights and different shelter board widths between the long press fingers by flow network method, and the relative law was analyzed. In order to study the influence of the changed end ventilation structures on the temperature distribution of the end parts, 3-D transient electromagnetic field in the turbogenerator end was calculated, and the eddy current losses (heat sources) of the end parts were gained by the finite-element method. Meanwhile, the fluid and thermal mathematics and physical models of the end region were given. Using the finite-volume method, the influence of the changed end ventilation structures on the surface heat transfer coefficient and the temperature of end parts was researched. It shows that the proper changes in the air gap spacer height and shelter board width decrease the copper shield temperature and result in a reasonable temperature distribution in the end parts. It provides the useful reference for the further design of the large Turbogenerators.
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Calculation of a Complex 3-D Model of a Turbogenerator With End Region Regarding Electrical Losses, Cooling, and Heating
IEEE Transactions on Energy Conversion, 2011Co-Authors: Li Weili, Guan Chunwei, Zheng PingAbstract:A significant problem of Turbogenerators on complex end structures is overheating of local parts caused by end losses and complex fluid flow in the end region. Therefore, it is important to investigate the 3-D flow and heat transfer process in the end. Using a 200-MW air-cooled turbogenerator as an example, the influences of end cores and the actual shapes and material of the end coils, press finger, press plate, and copper shield are considered for the end field calculation; then, the physical and mathematical models of the coil end with involute portions are created. The 3-D electromagnetic field was calculated and the losses of different parts in the end and its distribution were obtained. Based on this, the losses from magnetic field calculations will be applied to the end as heat sources in the temperature field. For symmetry of the ventilated structure, the fluid and thermal physical models of the generator within the half-axial section were determined. A set of equations of fluid flow and heat transfer were derived from the fluid-solid conjugated heat transfer and the fluid and temperature distributions were obtained after solving the equations. All of the aforementioned will provide a theoretical basis for the generator safe operation.
Li Yong - One of the best experts on this subject based on the ideXlab platform.
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influence of the end ventilation structure change on the temperature distribution in the end region of large water hydrogen hydrogen cooled turbogenerator
IEEE Transactions on Energy Conversion, 2013Co-Authors: Li Weili, Han Jichao, Zhou Xingfu, Huo Feiyang, Zhang Yihuang, Li YongAbstract:Flow network was built according to the ventilation structural characteristics of a 330 MW large water-hydrogen-hydrogen cooled turbogenerator. The variation of the fan inlet velocities, and the flow rates and pressures (boundary conditions) of each end region outlet were obtained, respectively, with different air gap spacer heights and different shelter board widths between the long press fingers by flow network method, and the relative law was analyzed. In order to study the influence of the changed end ventilation structures on the temperature distribution of the end parts, 3-D transient electromagnetic field in the turbogenerator end was calculated, and the eddy current losses (heat sources) of the end parts were gained by the finite-element method. Meanwhile, the fluid and thermal mathematics and physical models of the end region were given. Using the finite-volume method, the influence of the changed end ventilation structures on the surface heat transfer coefficient and the temperature of end parts was researched. It shows that the proper changes in the air gap spacer height and shelter board width decrease the copper shield temperature and result in a reasonable temperature distribution in the end parts. It provides the useful reference for the further design of the large Turbogenerators.
Chunwei Guan - One of the best experts on this subject based on the ideXlab platform.
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numerical calculation and analysis of three dimensional transient electromagnetic field in the end region of large water hydrogen hydrogen cooled turbogenerator
IEEE Transactions on Industrial Electronics, 2014Co-Authors: Weili Li, Chunwei Guan, Likun Wang, Yihuang Zhang, Yong LiAbstract: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.
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Influence of Metal Screen Materials on 3-D Electromagnetic Field and Eddy Current Loss in the End Region of Turbogenerator
IEEE Transactions on Magnetics, 2013Co-Authors: Likun Wang, Yong Li, Weili Li, Yihuang Zhang, Chunwei GuanAbstract:Since the structure of a large capacity turbogenerator is complex in the end region, accurate calculation about the leakage magnetic field becomes a key factor in the design. In this paper, a 330-MW level turbogenerator is electromagnetically analyzed and investigated with different metal screens in the end region. Its nonlinear transient electromagnetic field and eddy current loss were calculated by using the time step finite-element method (FEM). The influences of metal screen materials on the electromagnetic field and eddy current loss were compared and analyzed. All of these will contribute to the turbogenerator engineering design. Using the loss gained by the magnetic field calculation as a heat source, the thermal field of the end region with a copper screen was calculated. Compared with the test data, the calculated temperature results match well with the measured data.
