u GW 1-2 x + v y + w z = 0 1 u v w x y z ρuu + ρuv + ρuw = 3-4 x y z x( μ u x ) + y( μ u y ) + z ( μ u ) - p z x 2 ρvu + ρvv + ρ

Transcription

1 ELECTRI C MACHINES AND CONTROL Vol. 15 No. 4 Apr MW TM 315 A Numerical simulation of rheological properties inside large doubly-fed wind generator DING Shu-ye 1 SUN hao-qiong 1 JIANG Nan 1 DENG Lei 2 IE ing 1 1. School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin China 2. DG Environmental Technology Limited CompanyShanghai China AbstractHeat transfer and operating performance of generator are closely related to the ventilation structure and fluid flow behaviour. Taken a 3MW large doubly-fed wind generator as an examplephysical model of three dimensional fluid and temperature coupled field was established according to hydromechanics and heat transfer theory. On the base of the correctness of researching method and computing result proved by the temperature rise distribution of the whole generator the space distribution characters of different cooling medium inner generatorsuch as flow velocitypath line temperature rise and heat transfer coefficientwere analysed numerically using finite volume method. Rheological properties of cooling medium inner generator was obtainedby which a theory gist for design of ventilation structure for the same type generator and accurate calculation of fluid fields for the larger capacity wind generator is provided. Key wordsdoubly-fed wind generators3d fluid fieldrheological propertiesfinite volume method numerical simulation G38 RC2009QN

2 u GW 1-2 x + v y + w z = 0 1 u v w x y z ρuu + ρuv + ρuw = 3-4 x y z x( μ u x ) + y( μ u y ) + z ( μ u ) - p z x 2 ρvu + ρvv + ρvw = x y z x( μ v x ) + 5 y( μ v y ) + z ( μ v ) - p z y ρwu + ρwv + ρww = x y z x( μ w ) + x y( μ w ) + y z ( μ w ) - p z z ρ μ p ρut + ρvt + ρwt = λ l T x y z x( c p x ) + λ l T y( c p y ) + λ l T z ( c p z ) 5 c p T λ l 3MW x k T ( x x ) + y k T ( y y ) + T z ( k z ) = - q z T 1 n = 0 x y z 6 - k T n = αt - T f x y z T k x k y k z 3MW x y z W/m K q W /m 3 α W /m 2 K T f

3 Re > Ma 外筒体 中筒体 3 S S MW 1 S 5 S 6 转子风管 (b) 求解域轴向截面视图 7 2 Fig. 2 The physical model of solution region 2 S 1 S 2 端部风腔 Fig. 1 定子外围风道 水道 转子风管 端部风腔 (a) 求解域整体视图 1 Schematic diagram of ventilation cooling system 4 1 / SIMPLEC S 1 水道 内筒体 S 4 定子外围风道 S 3 S 4 S 5 S m /s m /s 3 1 S 3

4 4 31 Fig. 3 (a) 求解域整体剖分视图 1 号采样面 2 号采样面 (b) 求解域轴向截面剖分视图 3 3 号采样面 4 号采样面 The mesh of solution region Fig. 4 4 温升 (K) Calculation result of 3 - D temperature field K K F 速度 /m s -1 Fig. 5 Velocity distribution of cooling air on radial cross section 号采样面 2 号采样面 3 号采样面 4 号采样面

5 ~ m /s ~ 4. 39m /s K K 6 Fig. 7 7 温升 /K Temperature rise of cooling air Fig. 6 6 Path lines of cooling air inner generator 3. 3 水道出口 2 号水道 1 号水道 水道入口 0 8 Fig. 8 Distribution of fluid field inner water channel 速度 /m s

6 K 2 温升 /K Fig. 9 水道出口 9 2 号水道 水道入口 1 号水道 Temperature rise of cooling water on circumferential cross section of Electrical Power Science and Technology market in ChinaJ double-fed wind-driven generatorj M Table 1 1 Distribution list of heat conduction /W /% KRISTIANSEN HFALLET TBJORNEKLETT A. A study on the evaporation heat transfer in the cooling of high power electron- 3MW ics J 3 1. J SHI uewengao HuiCHEN hong. Technological development trends of super-large wind generating set J. Shenhua Technology J CHENG MingHANG unqianhang Jianzhong. Development and research progress of wind power generator J. Journal J. WANG FuU ueyuan. Prospect and problem of wind power Power Station Auxiliary Equipment2010. J. WU BingWANG Jiangliang. Analysis on operation principle of. Electric Switchgear ARMOR A FCHADM VK. Heat flow in the stator core of large turbine-generators by the method of three-dimensional finite elementspartⅠanalysis by scalar potential formulationpartⅡ Temperature distribution in the stator ironj. IEEE TransPAS MILOS BekovicANTON Hamler. Determination of the heating effect of magnetic fluid in alternating magnetic fieldj. IEEE Transactions on Magnetics MARIGNETTI FDRLLI Colli VCOIA. Design of Axial Flux PM Synchronous Machines Through 3-D Coupled Electromagnetic Thermal and Fluid-Dynamical Finite-Element Analysis J. IEEE Transactions on Industrial Electronics Semiconductor Thermal Measurement and Management

7 34 15 Symposium SARKAR D. Use of 3-dimensional finite elements for computation of temperature distribution in the stator of an induction motor J. IEE Proceeding B coupled fieldsj. Proceedings of the CSEE J LI WeiliANG uefenggu Debaoet al. Calculation and a- nalysis of fluid flow and heat transfer of air-cooled turbo-generator with multipath ventilation J. Transactions of China Electrotechnical Society J J LU ipingheng GuoliLI Juntinget al. Uniformity of WEI inlaoue QinghuiWANG onghonget al. Research multi-path ventilation in rotor of air inner-cooled turbo generator on middle frequency voltage test technique used in turn-to-turn J. Proceedings of the CSEE nal of Harbin University of Science and Technology J DING ShuyeSUN haoqiongmiao Lijieet al. Numerical in- 19. vestigation of stator main insulation temperature field for large generator. JElectric Machines and Control of Harbin University of Science and Technology J DING ShuyeLI WeiliJIN Huiyonget al. Cooling air state inside generator effect on stator temperature fields J. Proceedings of the CSEE M J. 23PTERAS JHATIATHANASSIOUV. Thermal analysis of an JIN HuiyongLI WeiliMA ianhaoet al. Calculation and a- nalysis of fluid velocity and fluid temperature in large air-cooled turbo-generator statorj. Proceedings of the CSEE J LI WeiliDING ShuyeJIN Huiyong. Numerical calculation of large synchronous generator stator temperature fields based on 17DING ShuyeLIU HaoranSUN haoqionget al. Research of fluid flow characteristic inside radial ventilation duct for large generator C Power and Energy Engineering Conference March Harbin. China insulation test for pole coils of large electrical machines J. Jour- J MENG DaweiSHI anghao ong. Analysis and calculation of additional losses in end region of induction motorj. Journal 20. M M AИ BΓ. electrical machine taking into account the iron losses and the deep-bar effectj. IEEE Transactions on Energy Conversion