Title page for ETD etd-02232008-152904


Type of Document Master's Thesis
Author Hatchett, John Henry
URN etd-02232008-152904
Title An Investigation of Effectiveness of Normal and Angled Slot Film Cooling in a Transonic Wind Tunnel
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Ng, Fai Committee Chair
Thole, Karen A. Committee Co-Chair
Diller, Thomas E. Committee Member
Keywords
  • film cooling
  • transonic turbine
  • normal and angled slots
Date of Defense 2008-02-22
Availability unrestricted
Abstract
An experimental and numerical investigation was conducted to determine the film cooling effectiveness of a normal slot and angled slot under realistic engine Mach number conditions. Freestream Mach numbers of 0.65 and 1.3 were tested. For the normal slot, hot gas ingestion into the slot was observed at low blowing ratios (M < 0.25). At high blowing ratios (M > 0.6) the cooling film was observed to “lift off” from the surface.

For the 30o angled slot, the data was found to collapse using the blowing ratio as a scaling parameter (x/Ms). Results from the current experiment were compared with the subsonic data published to confirm this test procedure. For the angled slot, at the supersonic freestream Mach number, the current experiment shows that at the same x/Ms, the film cooling effectiveness increases by as much as 25% as compared to the subsonic case.

The results of the experiment also show that at the same x/Ms, the film cooling effectiveness of the angled slot is considerably higher than that of the normal slot, at both subsonic and supersonic Mach numbers. The flow physics for the slot tests considered here are also described with computational fluid dynamic (CFD) simulations in the subsonic and supersonic regimes.

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