Expérimental investigation of heat transfer coefficients on the inclined multihole film cooling wall

Using the method of constant heat flux, the convective heat transfer coefficients were investigated experimentally in the inclined multihole film cooling. The main factors influencing the convective heat transfer include the blowing ratio, row-to-row spacing, hole-to-hole spacing and arrangement for inclined multihole. The ranges of these parameters were: main fluid Reynolds number about 17 000 and blowing rates from 1 to 4. Measuremerts were done for 4 variant test plates. The results indicated that the convective heat transfer coefficient increases greatly with film cooling and with the increasing of blowing rates for the same plate; the hole-to-hole spacing is more important than the row-to-row spacing for film cooling at the same condition.