This study is an investigation of two specific effects on turbine blade film cooling. The
effect of coolant to mainstream density ratio and upstream steps was studied. The
studies were conducted on two flat plates with 4mm cylindrical film cooling holes, one
with simple angle and the other with compound angle, in a low-speed suction type wind
tunnel.
Density effect was studied at ratios of 0.93 and 1.47 by using air and CO2 as coolant. An
IR camera was used to record the temperature on the plate and T-type thermocouples
were used to record the coolant and mainstream temperatures. During the study the
nature of the conduction effect from the heated coolant was studied and found to be most
prevalent along the plate surface not through the plate from the plenum. A methodology
was presented by which conduction error free results were obtained. The results showed
an increased effectiveness at higher density ratios, particularly near the holes and for the
simple angle plate.
Upstream step effect was studied using pressure sensitive paint and a coupled strobe
light and camera. Steps of 0.5, 1 and 1.5mm were placed at the upstream edge of the
holes. The steps were found to increase effectiveness significantly more than previous
studies have shown when placing the step slightly upstream of the holes.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2770 |
| Date | 15 May 2009 |
| Creators | Grizzle, Joshua Peter Fletcher |
| Contributors | Han, Je-Chin |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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