Investigation Of Flow And Heat Transfer In A Pin-Fin Trapezoidal Duct

Pin-fin is a traditional and effective cooling method in the turbine blade cooling system. The duct is very narrow at the edge of blade, so that few of the cooling method could be used in this area. Generally pin-fin rows structure is adopted to cool the edge of blade. This thesis describes the experimental and numerical researches of the flow and heat transfer characteristics in a pin-fin trapezoidal duct with lateral flow.Experiment measure static pressure, pressure loss coefficient, flow rate of lateral and heat transfer coefficient of endwall at different Re and different lateral-flow ratio(C). Particular attention has been concentrated on the affection of lateral-flow ratio and Re number. The experiment parameter is Re=15000, 30000, 50000, 70000 and 90000, C=0.25, 0.33, 0.5, 0.75 and 1.0. Get the following main conclusions:1, When the lateral-flow ratio is larger, along radial the static pressure variety is not remarkable, along chordwise the static pressure variety is intense. And when the lateral-flow ratio is lower, along radial the static pressure variety is obvious.2, The pressure loss coefficient is affect by the Re number smaller, basic is decreased with increasing Re. The pressure loss coefficient is affect by the C larger. That is increased with increasing C.3, The distribution of lateral flow rate is that near the radial entrance and exit larger, in the middle of duct smaller. When the lateral-flow ratio is lower, the each segment's flow rate has much difference, and when the lateral-flow ratio is larger, the each segment's flow rate has small variety.4, When the lateral-flow ratio lower, both along radial and along chordwise the heat transfer coefficient is degressive, and the grade is larger. When the lateral-flow ratio lager, along radial the heat transfer coefficient is degressive and the grade is smaller, but along chordwise the heat transfer coefficient is increased and the grade is smaller.5, Both the average Nu of endwall and the average Nu's relative-multiple (Nu/NuO) are increased with increasing Re, and are decreased first and then increased with increasing C.6, The result of numerical simulation and the experiment's result are similar. The trends of the result are similar too by both two research methods.