Effect of turbine inlet temperature on blade tip leakage flow and heat transfer

Sung Kim, M. Hamidur Rahman, Ibrahim Hassan

Research output: Contribution to conferencePaperpeer-review

6 Citations (Scopus)

Abstract

One of the most critical gas turbine engine components, rotor blade tip and casing, are exposed to high thermal load. It becomes a significant design challenge to protect the turbine materials from this severe situation. As a result of geometric complexity and experimental limitations, Computational Fluid Dynamics (CFD) tools have been used to predict blade tip leakage flow aerodynamics and heat transfer at typical engine operating conditions. In this paper, the effect of turbine inlet temperature on the tip leakage flow structure and heat transfer has been studied numerically. Uniform low (LTIT: 444 K) and high (HTIT: 800 K) turbine inlet temperature have been considered. The results showed the higher turbine inlet temperature yields the higher velocity and temperature variations in the leakage flow aerodynamics and heat transfer. For a given turbine geometry and on-design operating conditions, the turbine power output can be increased by 1.48 times, when the turbine inlet temperature increases 1.80 times. Whereas the averaged heat fluxes on the casing and the blade tip become 2.71 and 2.82 times larger, respectively. Therefore, about 2.8 times larger cooling capacity is required to keep the same turbine material temperature. Furthermore, the maximum heat flux on the blade tip of high turbine inlet temperature case reaches up to 3.348 times larger than that of LTIT case. The effect of the interaction of stator and rotor on heat transfer features is also explored using unsteady simulations.
Original languageEnglish
Pages1773-1782
Number of pages10
DOIs
Publication statusPublished - 2009
Event2009 Proceedings of ASME Turbo Expo Conference - Orlando, United States
Duration: 08 Jun 200912 Jun 2009

Conference

Conference2009 Proceedings of ASME Turbo Expo Conference
CountryUnited States
CityOrlando
Period08/06/200912/06/2009

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