凸极立式全蒸发冷却水轮发电机通风计算研究

Research on ventilation calculation of the vertical salient pole fully evaporative cooling hydro⁃generator

凸极立式水轮发电机的全蒸发冷却技术可以实现定转子绕组高效冷却,降低水轮发电机对通风系统的风量需求,但在发电机风路中引入多种阻力元件,可能对电机通风系统产生影响。为实现全蒸发冷却水轮发电机通风系统的精细化热设计,本文建立了电机定子蒸发冷却系统关键管路结构及端部定子线棒三维模型,通过CFD软件对定子端部流场进行了数值计算,获得了端部阻力特性;探讨了转子蒸发冷却系统冷凝器引入后,不同冷凝器设计方案下的转子流量压头特性;最后,基于一维等效风路方法,完成了通风系统风路计算,获取了电机各部分风量分配数据,并将FLOWMASTER软件计算结果与厂家设计值进行校核,确定计算准确性。本文可从精细化通风计算角度为蒸发冷却系统关键结构工程设计提供参考。

The full evaporative cooling technology of the salient pole vertical hydro⁃generator can achieve efficient cooling of the stator and rotor windings,reducing the air volume demand of the hydro generator for the ventilation system.However,the introduction of various resistance elements in the generator air path may have an impact on the motor ventilation system.To achieve refined thermal design of the ventilation system for fully evaporative cooling hydro⁃generators,the three⁃dimensional model of the key pipe lines structure of the stator evaporative cooling sys⁃tem and the end of stator wire rod were established.Then the numerical calculation of the stator end flow field was carried out through finite element CFD software,and the wind resistance law was obtained.After the introduction of the condenser in the rotor evaporative cooling system,the characteristics of the rotor flow pressure head under dif⁃ferent condenser design schemes were explored.Finally,based on the FLOWMASTER software,the calculation of wind path in the ventilation system was completed,and the air volume distribution data of each part of the motor was obtained through the path algorithm.The software calculation results are checked with the theoretical calcula⁃tion results to ensure the accuracy of the calculation.This paper can provide a reference for the key structural engi⁃neering design of evaporative cooling system from the perspective of refined ventilation calculation.