The intermediate turbine duct (ITD) is used to lead the mainstream through the radial increase between HPT and LPT. Duct geometry induces flow diffusion and lifting, resulting in pressure loss, outlet boundary distortion, and potential deterioration in downstream turbine performance. A thorough understanding of these effects is critical for improving ITD/turbine design and performance evaluation. This paper presents a parametric modeling method for generating representative duct geometries across the full design space. By combining Latin Hypercube Sampling (LHS) method and RANS simulations, the effects of geometric parameters on duct aerodynamics and the impact of representative duct outlet pressure distortions on turbine performance are systematically investigated. Correlation analysis indicate that the duct aerodynamic performance is governed by the combined effects of geometry design parameters, with the area ratio (AR) exhibiting the most significant influence. Increasing normalized duct length (L/h1) primarily deteriorates the flow field near duct hub and shroud, while a larger duct mean slopes angle (Θ) intensifies adverse pressure gradients and increase losses above midspan. A high AR simultaneously intensifies radial losses and alters the influence of Θ and L/h1. Turbine total efficiency is found to be more sensitive than mass flow rate under representative duct outlet distortions. This study can contribute to an enhanced understanding of duct design and the evaluation of duct-turbine interactions.
Huang et al. (Sat,) studied this question.
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