CAJ | 학술논문

随着空冷汽轮发电机容量不断增加,线圈尺寸加长,通风系统复杂,转子通风系统属多风路冷却系统。为减小因通风不均引起的轴向温差,本文以某大型空冷汽轮发电机半转子为研究对象,建立两个槽包括径向副槽通风、轴向通风及端部通风的多风路通风结构物理模型,基于计算流体动力学（CFD）原理,运用有限体积法进行三维紊流流场的数值模拟,得出进入转子端部、轴向及副槽通风道的空气量,分析多种结构对转子上述三部分风量分配的影响。针对本体,提出单位绕组轴向长度供风量评价风量分布均匀性。本文的方法及结论对大型电机转子本体部分轴向通风与副槽通风长度优化设计提供理论依据。
수착공랭기륜발전궤용량불단증가,선권척촌가장,통풍계통복잡,전자통풍계통속다풍로냉각계통。위감소인통풍불균인기적축향온차,본문이모대형공랭기륜발전궤반전자위연구대상,건립량개조포괄경향부조통풍、축향통풍급단부통풍적다풍로통풍결구물리모형,기우계산류체동역학（CFD）원리,운용유한체적법진행삼유문류류장적수치모의,득출진입전자단부、축향급부조통풍도적공기량,분석다충결구대전자상술삼부분풍량분배적영향。침대본체,제출단위요조축향장도공풍량평개풍량분포균균성。본문적방법급결론대대형전궤전자본체부분축향통풍여부조통풍장도우화설계제공이론의거。
With the turbo generator’s capacity increasing, the size of rotor coil is lengthened. The ventilation system becomes complicated, and the rotor ventilation system belongs to the multi-path cooling system. In order to reduce axial temperature difference due to the non-uniform ventilation, a physical model of multi-path ventilation structure is presented, combined with a given example of half rotor in the large turbo generator with air cooling; the multi-path ventilation consists of the radial sub slot ventilation, the axial ventilation and the rotor end ventilation. Based on computational fluid dynamics（CFD） principle, the three dimensional turbulent flow field is simulated by finite volume method, and the air mass flow rate of entering rotor end segment, axial ducts and sub slot is obtained. The effect of some structures on the air flow rate distribution of various ventilation segments mentioned above is analyzed. In view of the rotor body, the air flow rate per unit axial length of windings is presented to evaluate the uniformity of ventilation cooling. The method and the conclusion will provide theoretical guidance to the optimization design of the length of the axial and sub slot ventilation of the large generator rotor.