Calculation And Analysis Of3-D Flow And Temperature Fields Of The End And Stator Region In A Large Water-Hydrogen-Hydrogen Cooled Turbogenerator

With the rapid development of unit capacity of the large turbogenerator,electromagnetic load is also increasing correspondingly. Heating problem ofgenerator has affected the safe and stable operation of the generator. Theadvantages of low ventilation friction loss, high efficiency and small noise makewater-hydrogen-hydrogen cooled turbogenerator more and more popular in thepower plant. Therefore, it needs to research deeply the heating and coolingproblems of the water-hydrogen-hydrogen cooled turbogenerator. The gainedconclusions can provide important reference for the research and development oflarger capacity turbogenerator.In this paper, according to the actual structure characteristics of water-hydrogen-hydrogen cooled turbogenerator, fluid mechanic and heat transfertheory,3-D multi-physics field mathematics and physical models of the wholeend region are established. Giving the boundary conditions and basicassumptions, the3-D coupling field in the turbogenerator end region is solved byusing the finite volume method. The distribution of the temperature of coppershield, press plate and press finger are obtained under rated operating conditions.The highest temperature point in the end region is determined. Comparing thecalculated temperature results with the test values, the reliability and accuracy ofthe calculation method are verified. In addition, according to the fluid flow andheat transfer characteristics within the cooling system of the half the axialsegments in the turbogenerator stator core,3-D fluid and thermal mathematicsand physical models of the turbogenerator stator region are established, which consider the winding water pipe position and cooling water velocity. Based onthe computed results of3-D coupling field in the turbogenerator end region, thetemperatures of the upper and lower strands, the strand insulations, stator coreand the fluid in the ventilation ducts are researched in detail under ratedoperating conditions.The gained conclusions will provide theoretical basis and reference for thesafe and stable operation in the large capacity turbogenerator in future.