Heat Transfer Characteristics of Multi-Inlet Rotating Disk Cavity

Han Xiao, Xueying Li () and Jing Ren
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Han Xiao: Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Xueying Li: Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Jing Ren: Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China

Energies, 2025, vol. 18, issue 19, 1-15

Abstract: The secondary air system plays important roles in gas turbines, such as cooling hot-end components, sealing the rim, and balancing axial forces. In this paper, the flow structure and the heat transfer characteristics of the rotating disk cavity with two inlets and single outlet is studied by CFD (Computational Fluid Dynamics) approach. The effect and mechanism under higher rotational speed and larger mass flow rate are also discussed. The results show that a large-scale vortex is induced by the central inlet jet in the low-radius region of the cavity, while the flow structure in the high-radius region is significantly influenced by rotational speed and flow rate. Increasing the rotational speed generally enhances heat transfer because it amplifies the differential rotational linear velocity between the disk surface and nearby wall flow, consequently thinning the boundary layer. Increasing the mass flow rate enhances heat transfer through two primary mechanisms: firstly, it elevates the turbulence intensity of the near-wall fluid; secondly, the higher radial velocity results in a thinner boundary layer.

Keywords: gas turbine; secondary air system rotating disk cavity; heat transfer; computational fluid dynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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