The endwall influence on heat transfer from a single cylinder - The horseshoe vortex effect

An investigation is conducted on the influence of a horseshoe vortex on the stagnation region heat transfer characteristics of a two-dimensional bluff body (such as a gas turbine airfoil). A clse simulation of the various configurations of this phenomenon in engineering problems is found in a cylinder that intersects a plane plate in wind tunnel flow. Experimental results indicate increased heat transfer coefficient on the cylinder with increasing endwall upstream protrusion. For circumferential average heat transfer, a reversal of the effect of the endwall protrusion is noted; moreover, interactions of the horseshoe vortex flow with the flow in the separated region at the rear of the cylinder are found to make rational deductions and analyses difficult.