CAJ | 학술논문

为了在多风路通风冷却结构下,得到转子线圈长度方向较完整的温度分布,结合某大型空冷汽轮发电机转子,在研究转子半轴向段空气流量分布的基础上,建立转子端部、半轴向段本体及绕组的三维传热及紊流流动物理模型,基于计算流体动力学原理,运用有限体积法进行转子初始通风结构的温度场求解,在此基础上,调整副槽通风段通风孔数量及端部进风孔位置,增加进入端部空气量,降低转子端部绕组高温及本体段绕组轴向温差。研究结果表明,转子端部最大温升位于端部弧段顶匝绕组中心区域,本体绕组最高温度在轴向通风段。结论为空冷汽轮发电机转子通风优化设计提供理论指导。
위료재다풍로통풍냉각결구하,득도전자선권장도방향교완정적온도분포,결합모대형공랭기륜발전궤전자,재연구전자반축향단공기류량분포적기출상,건립전자단부、반축향단본체급요조적삼유전열급문류류동물리모형,기우계산류체동역학원리,운용유한체적법진행전자초시통풍결구적온도장구해,재차기출상,조정부조통풍단통풍공수량급단부진풍공위치,증가진입단부공기량,강저전자단부요조고온급본체단요조축향온차。연구결과표명,전자단부최대온승위우단부호단정잡요조중심구역,본체요조최고온도재축향통풍단。결론위공랭기륜발전궤전자통풍우화설계제공이론지도。
In view of the rotor cooling structure with multi-path ventilation,in order to obtain more complete temperature distribution along the length direction of the rotor coils,a calculation model of three dimension heat transfer and turbulence is presented on basis of the research on the air flow rate distribution of the rotor’s half axial segment,combined with a given example of some large turbo generator rotor with air cooling,and the model consists of rotor end winding and the half length of rotor. Based on computational fluid dynamics（CFD）principle,the temperature field of initial rotor ventilation structure is calculated by finite volume method.Based on the results,the number of ventilation ducts among the sub slot ventilation and the position of end inlet is adjusted to increase the end air flow rate and to decrease the temperature of rotor end windings and axial of the rotor end temperature difference among the rotor body windings.The results show that the maximum temperature is located in the mid arc segment of the top winding;the maximum temperature of the rotor body winding is locatein the axial ventilation segment.The conclusion will provide theoretical guidance to optimization design of rotor ventilation.