TY - GEN
T1 - Heat transfer in trailing edge wedge-shaped pin-fin channels with slot ejection under high rotation numbers
AU - Rallabandi, Akhilesh P.
AU - Liu, Yao-Hsien
AU - Han, Je Chin
PY - 2010/12/1
Y1 - 2010/12/1
N2 - The heat transfer characteristics of a rotating pin-fin roughened wedge shaped channel have been studied. The model incorporates ejection through slots machined on the narrower end of the wedge, simulating a rotor blade trailing edge. The copperplate regional average method is used to determine the heat transfer coefficient; pressure taps have been used to estimate the flow discharged through each slot. Tests have been conducted at high rotation (≈ 1 ) and buoyancy (≈ 2) numbers, in a pressurized rotating rig. Reynolds Numbers investigated range from 10,000 to 40,000 and rotational speeds range from 0-400rpm. Pin-fins studied are made of copper as well as non-conducting garolite. Results show high heat transfer coefficients in the proximity of the slot. A significant enhancement in heat transfer due to the pin-fins, compared with a smooth channel is observed. Even the non-conducting pin-fins, indicative of heat transfer on the endwall show a significant enhancement in the heat transfer coefficient. Results also show a strong rotation effect, increasing significantly the heat transfer coefficient on the trailing surface - and reducing the heat transfer on the leading surface.
AB - The heat transfer characteristics of a rotating pin-fin roughened wedge shaped channel have been studied. The model incorporates ejection through slots machined on the narrower end of the wedge, simulating a rotor blade trailing edge. The copperplate regional average method is used to determine the heat transfer coefficient; pressure taps have been used to estimate the flow discharged through each slot. Tests have been conducted at high rotation (≈ 1 ) and buoyancy (≈ 2) numbers, in a pressurized rotating rig. Reynolds Numbers investigated range from 10,000 to 40,000 and rotational speeds range from 0-400rpm. Pin-fins studied are made of copper as well as non-conducting garolite. Results show high heat transfer coefficients in the proximity of the slot. A significant enhancement in heat transfer due to the pin-fins, compared with a smooth channel is observed. Even the non-conducting pin-fins, indicative of heat transfer on the endwall show a significant enhancement in the heat transfer coefficient. Results also show a strong rotation effect, increasing significantly the heat transfer coefficient on the trailing surface - and reducing the heat transfer on the leading surface.
UR - http://www.scopus.com/inward/record.url?scp=82055191566&partnerID=8YFLogxK
U2 - 10.1115/GT2010-22832
DO - 10.1115/GT2010-22832
M3 - Conference contribution
AN - SCOPUS:82055191566
SN - 9780791843994
T3 - Proceedings of the ASME Turbo Expo
SP - 369
EP - 380
BT - ASME Turbo Expo 2010
Y2 - 14 June 2010 through 18 June 2010
ER -