Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator

Version 1 : Received: 8 July 2020 / Approved: 10 July 2020 / Online: 10 July 2020 (08:34:07 CEST)

A peer-reviewed article of this Preprint also exists.

Jeon, S.; Son, C.; Yang, J.; Ha, S.; Hwang, K. Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator. Energies 2020, 13, 4137. Jeon, S.; Son, C.; Yang, J.; Ha, S.; Hwang, K. Full Surface Heat Transfer Characteristics of Stator Ventilation Duct of a Turbine Generator. Energies 2020, 13, 4137.

Journal reference: Energies 2020, 13, 4137
DOI: 10.3390/en13164137

Abstract

Turbine generator operates with complex cooling system due to the challenge in controlling the peak temperature of the stator bar caused by ohm loss, which is unavoidable. Therefore, it is important to characterise and quantifies the thermal performance of the cooling system. The focus of the present research is to investigate the heat transfer and pressure loss characteristics of typical cooling system, so-called stator ventilation duct. A real scale model was built at its operating conditions for the present study. The direction of cooling air is varied to consider its operation condition, so that there are (1) outward flow and (2) inward flow cases. In addition, the effect of (3) cross flow (inward with cross flow case) is also studied. The transient heat transfer method using thermochromic liquid crystals is implemented to measure full surface heat transfer distribution. A series of Computational Fluid Dynamics analysis is also conducted to support the observation from the experiment. For the inward flow case, the results suggest that the average Nusselt number of the 2nd duct is about 30% higher than the 3rd duct. The trend is similar with the effect of cross flow. The CFD results are in good agreement with the experimental data.

Subject Areas

turbine generator; stator ventilation duct; transient heat transfer; pressure loss

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.