Research on Relativity of Flow Rate Distribution Inside the Rotor Domain for a Large-Scale Air-Cooled Turbo-Generator

Abstract

The main objective of this paper is to elucidate the effect of rotor end structures of a large-scale air-cooled turbo-generator on the flow rate distribution and fluid flow pattern in the rotor domain. A 350 MW fully air-cooled turbo-generator is taken as an example. Based on the original ventilation structure, two optimization schemes of adding wind deflectors and small fans to the end of the rotor are proposed. The finite volume method is used to solve the fluid field in the generator with different rotor end structures. The air volume distribution in each wind area of the generator is taken as the basis for checking the accuracy of the calculation. Under different schemes, the wind path direction, flow rate and fluid velocity distribution in the radial ventilation ducts, subslots and crescent slots of the rotor are compared and analyzed. The effects of these schemes on the overall flow rate distribution and the fluid parameter distribution characteristics in each rotor ventilation ducts are determined. INDEX TERMSAir-cooled turbo-generator, finite volume method, fluid field, rotor, ventilation structure.

Thermal analysis of axial‐radial hybrid ventilation motor and stator ventilation channel improvement

“…In numerical studies of the ARHVM temperature field, it is often difficult to simulate the real situation of the cooling fluid flow in the whole motor due to incomplete model building and calculation area [15][16][17]. And most of the improvements to the cooling structure of the ARHVM in the previous papers have focussed on the axial cooling structure and the improvement of the external cooler [10,[18][19][20].…”

Influence of a Novel Stator Teeth Internal Ventilation Structure on Air-Cooled Turbo-Generator Parameters and Stator Temperature

“…J. Nerg proposed a lumped-parameter-based thermal analysis of a generator with double radial forced-air cooling, and selected of the number of radial cooling channels and axial length of the generator [8]. S. Ding established a global physical model including the stator, rotor, casing and fan to obtain air flow distribution characteristics of the generator under different ventilation schemes, and proposed baffle at rotor end to make the flow distribution more uniform and reasonable [9]. A. S. Bornschlegell used lumped-parameter method and genetic algorithm to calculate and optimize the air volume distribution in the ventilation system of a large generator [10].…”