Abstract
An experimental investigation has been conducted to study, for turbulent air flow through a pin fin channel with ejection holes, the effects of varying the ejection hole configuration on the distribution of the regionally-averaged heat transfer and the overall pressure drop. The channel models the internal cooling passages near the trailing edges of rotor or stator blades in modern gas turbine engines. When air exits through ejection holes, the segmental heat transfer decreases much faster with increasing distance from the channel entrance and the overall channel pressure drop is lower than in the straight-flow-only ease. Increasing the number of ejection holes and increasing the size of the ejection holes lower the distribution of the segmental heat transfer and the overall pressure drop.
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