Research Status and Development Trend of Rotating Internal Cooling Channel in Gas Turbine Blade

doi:10.12096/j.2096-4528.pgt.24145

Abstract

Abstract:

Objectives The high-efficiency internal cooling technology of turbine blade is crucial for improving the thermal efficiency of gas turbine. As an important component of the gas turbine, it is essential to conduct research on the cooling performance of rotor blade. Due to significant effect of Coriolis force, buoyancy force, and channel structure on the cooling performance of rotating internal channel of turbine blade, this paper summarized the research status and development trends of rotating internal cooling channel based on these effect factors. Methods A new structural design of rotating internal cooling channels was introduced, and a new rotating internal cooling channel structure suitable for double-walled blade configurations was proposed. Conclusions Double-sided enhanced U-shaped channels can utilize the enhanced heat transfer effect of Coriolis force, resulting in better cooling performance than traditional rotating U-shaped channels. There is a broad room for improvement in the internal cooling of gas turbine rotor blades.

Key words: gas turbine, turbine blade, internal cooling, rotating, Coriolis force

CLC Number:

TK 14

Jing REN, Xueying LI. Research Status and Development Trend of Rotating Internal Cooling Channel in Gas Turbine Blade[J]. Power Generation Technology, 2024, 45(5): 793-801.

Figures/Tables 6

Fig. 1 Conceptual diagram of secondary flow and radial flow profile in a rotating rectangular smooth U channel

Fig. 2 Flow profiles in a square smooth U channel under different rotation numbers

Fig. 3 Conceptual diagram about the influence of Coriolis force and buoyancy on radial flow profile under non-heated rotating condition

Fig. 4 Schematic cross-section diagram of conventional serpentine internal channel in a blade

Fig. 5 Geometric conceptual diagram of three rotating cooling channels arranged inside blades

Fig. 6 Comparison curves of average Nusselt number ratio on the leading and trailing walls of conventional U channel, bifacial-enhanced U channel, and 90° three-channel channel

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