Abstract
In the design and calculation of a 330 MW water-water-air cooling turbo-generator, it was found that the flow direction of the fluid in the local stator radial ventilation duct is opposite to the design direction. In order to study what physical quantities are associated with the formation of this unusual fluid flow phenomenon, in this paper, a 100 MW air-cooled turbo-generator with the same ventilation structure as the abovementioned models is selected as the research object. The distribution law and pressure of the fluid in the stator radial ventilation duct and axial flow velocity at the air gap entrance are obtained by the test method. After the calculation method is proved correct by experimental results, this calculation method is used to calculate the flow velocity distribution of the outlets of multiple radial ventilation ducts at various flow velocities at air gap inlets. The relationship between the flow distribution law of the stator ventilation ducts and the inlet velocity of the air gap is studied. The phenomenon of backflow of fluid in the radial ventilation duct of the stator is found, and then the influence of backflow on the temperature distribution of stator core and winding is studied. It is found that the flow phenomenon can cause local overheating of the stator core.
Highlights
Regarding the research on the temperature field of large turbo-generators, most scholars have mainly focused on the research on the fluid field and the temperature field [1,2,3]
Unlike the above research contents, the main content of this paper is about which physical quantities of the fluid are related to the fluid flow distribution rules in the ventilation duct of the generator and which significant changes will occur with the changes of these physical quantities
A 100 MW single-channel ventilation turbo-generator set is taken as the research object, and the experimental measurement method [7,8,9] of flow in stator radial duct distribution and air gap flow velocity of ventilation duct is proposed
Summary
Regarding the research on the temperature field of large turbo-generators, most scholars have mainly focused on the research on the fluid field and the temperature field [1,2,3]. It is found that the air gap inlet velocity is the main factor affecting the distribution of the fluid flow rate in the stator ventilation duct Based on this calculation method, the is significantly lower. The calculated results are in good agreement with the experimental velocity results at the after air gap entrance, the phenomenon of backflow in the stator iron core ventilation duct comparison. Based on this calculation method, the results of Measurement velocity distribution differentAnalysis radial ventilation ducts of generator stator are calculated. Test and Measurement of the Velocities at Air Gap Inlet and Radial Ventilation Duct Outlets in the will occur locally
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
