Experimental investigations of the film cooling heat transfer coefficient of a Micro-Tangential-Jet scheme on a gas turbine vane

摘要: Abstract This paper presents experimental investigations of the Heat Transfer Coefficient (HTC) performance a Micro-Tangential-Jet (MTJ) film cooling scheme on gas turbine vane using transient Thermochromic Liquid Crystal (TLC) technique. The MTJ is micro-shaped designed so that secondary jet supplied parallel to surface. In order supply in direction surface, extra material was added both pressure and suction sides. one row holes sides were investigated at blowing ratio ranging from 0.5 1.5 side 0.25 0.625 side, calculated based exit area. average density during 0.93, Reynolds number 1.4E+5, free stream velocity main duct hydraulic diameter. pitch diameter 5 6.5 side. turbulence intensity all 8.5% measure two chords upstream leading edge PIV showed increase HTC due presence very close resulting normal traditional shaped schemes Meanwhile, reduction recorded Such attributed small overall height which helped keep minimum. Moreover, distribution downstream uniform lateral directions helps minimize thermal stresses. Net Flux Reduction (NHFR) parameter used judge scheme. NHFR represents combination effects effectiveness HTC. Great enhancement observed compared schemes. With current design dimensions under previously mentioned it unity, area, provides an optimal