Generation of longitudinal vortices in internal flows with an inclined impinging jet and enhancement of target plate heat transfer

Flow velocity measurements and heat transfer experiments were carried out for a jet obliquely discharged into a crossflow in a duct. The flow measurements were made with optical fiber laser Doppler velocimetry, and the heat transfer experiments were made by making use of a thermochromic liquid crystal. The obtained velocity data reveal that the inclined jet is effective in generating longitudinal vortices in the crossflow. It is demonstrated that the longitudinal vortices are effective in enhancing target plate jet impingement heat transfer. It is, therefore, promising as a means to effectively cool inner surfaces of high temperature gas turbine vanes. The obtained heat transfer data are discussed in detail in comparison with the measured flow field and turbulence data. (C) 1998 Elsevier Science Inc. All rights reserved.