Investigation on flow and heat transfer mechanism of corrugated internal cooling channel of turbine cascades
A new type of corrugated channel cooling structure was proposed and designed for the key scientific problem of strengthening the cooling and heat dissipation of cascades.A refined numerical simulation was carried out to analyze the effect of the cold air inlet Reynolds number and corrugated shape parameters on the heat transfer performance,and the flow and heat transfer mechanism of the corrugated channel cooling structure of the high Reynolds number turbine blade was studied.The calculation results showed that the alternating peaks and troughs of the corrugated channels had a strong perturbation effect on the flow field,and the local heat transfer coefficient was 2-3 times stronger than the smooth channels;the heat transfer effect varied with positions on the same corrugation,and the heat transfer coefficient was the largest at the contraction of the channel;the heat transfer capacity of the corrugated channel was closely related to the shape of the corrugation,and the heat transfer effect was the best near H/L=0.115 when the Reynolds number of cold air inlet was large.The physical mechanism of the corrugated channel to enhance heat transfer was revealed,providing a technical support for the design of the cooling structure of aero-engine cascades.
turbine cascadesflow and heat transferheat transfer coefficientcooling structure designcorrugated channel
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