Assessment of subsonic turbine cascade flow field and numerical viscous loss using the power-loss method

Wei Wei, Xuesong Li, Xiaodong Ren, Chunwei Gu and Qinglong Liu

Energy, 2025, vol. 335, issue C

Abstract: Accurate evaluation of flow field loss is a critical step in optimizing the design of high-efficiency fluid machinery. However, local loss evaluation methods may underestimate flow loss due to the influence of numerical viscosity. This study employs the local power-loss method to perform a comparative analysis of subsonic turbine cascade flow fields simulated using RANS and LES approaches with five different discretization schemes of convection terms. The study investigates in detail the impact of numerical viscosity on cumulated power loss in the flow field and differences in vortex shedding simulations downstream of the cascade trailing edge. It demonstrates that the power-loss method effectively captures the impact of numerical viscosity and, for the first time, quantitatively separates the contributions of numerical and physical viscosity to total loss. The LES data of turbulent wakes reveals the influence of numerical viscosity on wake turbulence decay and microstructures. This study provides technical insights for optimizing thermodynamic processes of energy plants, reducing different types of flow losses, and selecting and developing new convective discretization schemes.

Keywords: Numerical viscosity; Discretization schemes; Power-loss method; Irreversible loss; Turbine cascade (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:335:y:2025:i:c:s0360544225040034

DOI: 10.1016/j.energy.2025.138361

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