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

Shinyoung Jeon, Changmin Son, Jangsik Yang, Sunghoon Ha and Kyeha Hwang
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Shinyoung Jeon: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Changmin Son: Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
Jangsik Yang: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Sunghoon Ha: Doosan Heavy Industries & Construction, Changwon 51711, Korea
Kyeha Hwang: Doosan Heavy Industries & Construction, Changwon 51711, Korea

Energies, 2020, vol. 13, issue 16, 1-19

Abstract: Turbine generators operate with complex cooling systems 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 characterize and quantify the thermal performance of the cooling system. The focus of the present research is to investigate the heat transfer and pressure loss characteristics of a typical cooling system, the so-called stator ventilation duct. A real scale model was built at its operating conditions for the present study. The direction of cooling air was 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) was 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 (CFD) analyses were also conducted to support the observation from the experiment. For the outward flow case, the results suggest that the average Nusselt numbers of the 2nd and 3rd ducts are at maximum 100% and 30% higher, respectively, than the inward flow case. The trend was similar with the effect of cross flow. The CFD results were in good agreement with the experimental data.

Keywords: turbine generator; stator ventilation duct; transient heat transfer; pressure loss (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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