Effects of inlet temperature uniformity and nonuniformity on the tip leakage flow and rotor blade tip and casing heat transfer characteristics

Md Hamidur Rahman, Sung In Kim, Ibrahim Hassan

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

High thermal load appears at the blade tip and casing of a gas turbine engine. 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 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 (444 K) and high (800 K) inlet temperatures and nonuniform (parabolic) temperature profiles have been considered at a fixed rotor rotation speed (9500 rpm). The results showed that the change of flow properties at a higher inlet temperature yields significant variations in the leakage flow aerodynamics and heat transfer relative to the lower inlet temperature condition. Aerodynamic behavior of the tip leakage flow varies significantly with the distortion of turbine inlet temperature. For more realistic inlet condition, the velocity range is insignificant at all time instants. At a high inlet temperature, reverse secondary flow is strongly opposed by the tip leakage flow and the heat transfer fluctuations are reduced greatly.

Original languageEnglish
Article number021001
JournalJournal of Turbomachinery
Volume134
Issue number2
DOIs
Publication statusPublished - 2012
Externally publishedYes

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Turbomachine blades
Rotors
Heat transfer
Turbines
Aerodynamics
Temperature
Intake systems
Secondary flow
Flow structure
Thermal load
Gas turbines
Computational fluid dynamics
Engines

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Effects of inlet temperature uniformity and nonuniformity on the tip leakage flow and rotor blade tip and casing heat transfer characteristics. / Rahman, Md Hamidur; Kim, Sung In; Hassan, Ibrahim.

In: Journal of Turbomachinery, Vol. 134, No. 2, 021001, 2012.

Research output: Contribution to journalArticle

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