Investigation On Flow And Heat Transfer Characteristics In Typical Turbine Trailing Edge Internal Channel

Pin fins are often used in turbine blade internal structure as a traditional and effective coolingmethod restricted to trailing edge narrow channel. Pin-fin rows of inner cooling channel can enhanceheat transfer, and also bring supportive reinforcement. Based on the numerical simulation andexperimental method, flow and heat transfer characteristics of trapezoidal channel with pin-finarrays the are systematically studied.In this paper, flow distribution, flow resistance coefficient and the heat transfer coefficient arestudied at different Reynolds numbers, back pressure distribution and pin-fin arrangement. Severalmain conclusions are obtained as below:1. Flow turning degree and flow route are the main factors affecting the flow resistance.2.With the same mainstream Reynolds number, as pin fin row number increases, heat transfercoefficient of each flow section increases within the scope of this research, but flow resistancecoefficient also increases; heat transfer coefficient of staggered pin-fin array are larger than pin-finarrays in normal while flow resistance of two kinds of arrays are close.3. As the Reynolds number increases, flow resistance coefficient of each section decreases andheat transfer coefficient increases.4. As the Reynolds number increases, flow distribution of each section under identical backpressure remains consistent while each section’s flow under back pressure is tend to be average.5. Conclusions obtained by experiments and numerical calculation are consistent.