Flow and heat transfer measurements in laminar and turbulent convex surface boundary layers

摘要

Convex surface boundary layers have been experimentally investigated in a low speed wind tunnel, in the presence of pressure gradients (k) of-3.6×10~-6≤k≤+3.6×10~-6 for laminar and -3.6×10~-6≤k≤+3.6×10~-6 for turbulent flows. Flow and heat transfer measurements showed that stabilising effects of favourable pressure gradients caused thinner boundary layers, fuller velocity profiles and corresponding higher heat transfer rates. Downstream laminar and turbulent heat transfer measurements were below the flat plate laminar analytical solution and turbulent correlation by 54.2/100 and 25/100 respectively.