TY - JOUR
T1 - Enhancement of heat transfer in the leading edge of gas turbine blade with various rib turbulators
AU - Kim, Jinhun
AU - Kim, Jeong Ju
AU - Bang, Minho
AU - Kim, Taehyun
AU - Park, Hee Seung
AU - Cho, Hyung Hee
N1 - Publisher Copyright:
© 2020 The Korean Society of Mechanical Engineers.
PY - 2020/5
Y1 - 2020/5
N2 - This study investigated heat transfer characteristics and improvement in a triangular channel with a rounded leading edge and rib turbulator. The channel cross section has a 120° fillet on the leading edge of the equilateral triangle. The Reynolds number based on hydraulic diameter is 30,000. The angles of the rib turbulator are 45° and 90°. The rib height to hydraulic diameter ratio is 0.079 and the rib pitch to height ratio is 8. In a triangular channel with a large curvature of leading edge, the changing pressure field caused by the rib turbulator accelerates the flow and increases heat transfer. The 90° rib showed higher heat transfer than 45° rib on the leading edge region. To further improve the heat transfer, the effect of a pin added between the ribs and rib length extension was studied. As a result, the thermal performance factor was enhanced by 4 % and 9 %, respectively.
AB - This study investigated heat transfer characteristics and improvement in a triangular channel with a rounded leading edge and rib turbulator. The channel cross section has a 120° fillet on the leading edge of the equilateral triangle. The Reynolds number based on hydraulic diameter is 30,000. The angles of the rib turbulator are 45° and 90°. The rib height to hydraulic diameter ratio is 0.079 and the rib pitch to height ratio is 8. In a triangular channel with a large curvature of leading edge, the changing pressure field caused by the rib turbulator accelerates the flow and increases heat transfer. The 90° rib showed higher heat transfer than 45° rib on the leading edge region. To further improve the heat transfer, the effect of a pin added between the ribs and rib length extension was studied. As a result, the thermal performance factor was enhanced by 4 % and 9 %, respectively.
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U2 - 10.3795/KSME-B.2020.44.5.281
DO - 10.3795/KSME-B.2020.44.5.281
M3 - Article
AN - SCOPUS:85085190449
SN - 1226-4881
VL - 44
SP - 281
EP - 288
JO - Transactions of the Korean Society of Mechanical Engineers, B
JF - Transactions of the Korean Society of Mechanical Engineers, B
IS - 5
ER -