A design method of volute profile of multi-blade centrifugal fan based on DRBF model

Zhang, A. Tianle; Zhou, B. Shuiqing; Mao, C. Zijian; He, D. Jiacheng; Fang, E. Xiaohai

doi:10.1063/5.0180530

Cited by 3 publications

References 27 publications

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Flow mechanism of a highly loaded low pressure turbine cascade with integrated-optimized end wall contouring and root lean

Xue,

Wu,

et al. 2024

Physics of Fluids

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The end wall loss of modern highly loaded low pressure turbine (LPT) has been greatly increased, due to the enhanced secondary flow loss and boundary layer separation loss. Thus, it is of great significance to develop effective flow control strategies to improve the end wall flow condition and aerodynamic performance of modern LPT. This research carried out a numerical investigation on the coupled flow control strategy, which combined non-axisymmetric end wall contouring (NEC) and root tangential lean (RTL), based on a highly loaded LPT cascade (Zweifel = 1.59). Meanwhile, the optimization process was used to get the optimal design parameters of the coupled method NEC&RTL. The results indicate that the optimal coupled configuration can reduce the total pressure loss coefficient by 12.68% and the non-dimensional secondary kinetic energy by 23.91%. Compared with the reference cascade without modification, the coupled method is found to improve the end wall flow conditions: the passage vortex is weakened both in size and strength, mainly attributed to the smaller cross-passage pressure gradient resulting from NEC; the closed separation bubble near end wall and the three-dimensional separation flow before trailing edge are eliminated, due to the great downward pressure gradient near end wall resulting from RTL; and the counter vortex is eliminated and the slender back flow is weakened under the additional coupling flow control effect of NEC&RTL. Therefore, the coupled flow control method can not only highlight the advantages of the independent methods, but also induce external flow control superiorities, demonstrating the application prospect of the coupled flow control strategy on the highly loaded LPT.

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Flow mechanism of a highly loaded low pressure turbine cascade with integrated-optimized end wall contouring and root lean

Xue,

Wu,

et al. 2024

Physics of Fluids

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Effects of curved vanes on aerodynamic performance and flow structures in highly loaded tandem cascades

Luo,

Song

et al. 2024

Physics of Fluids

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Combining tandem cascades and curved vanes can mitigate the separation in highly loaded compressor cascades. Flow loss mechanisms in curved tandem cascades are crucial for fundamental design and optimization. This study investigates the flow losses and vortex structures in curved tandem cascades with different curved angles and an original straight tandem cascade. Numerical simulations are conducted at variable incidence angles. The results indicate no consistent effect of curved angles on the aerodynamic performance of curved tandem cascades. The tandem cascade with a curved angle of 5° effectively reduces losses at all incidence angles, while the tandem cascade with a curved angle of 15° extends the critical incidence angle to 3°. The comparative analyses reveal that curved vanes increase spanwise pressure gradients, causing low-energy fluid near endwalls to move toward the midspan. The weighting coefficient of losses quantitatively describes that curved vanes weaken the trailing edge shedding vortices of both vanes and passage vortex while enhancing the end wall spanwise vortex of the front vane, thus affecting the loss distribution. Finally, this study innovatively applies topological analysis methods to curved tandem cascades, establishing the relationship between topological structures and vortex structures in corner regions of tandem cascades, which provides a valid research approach to reveal the vortex dynamics mechanisms of the loss distribution in tandem cascades influenced by curved vanes.

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Numerical Simulation of Aerodynamic Heater: Effect of Blade Number

Yang,

Zhao,

Chen

et al. 2024

Preprint

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A design method of volute profile of multi-blade centrifugal fan based on DRBF model

Cited by 3 publications

References 27 publications

Flow mechanism of a highly loaded low pressure turbine cascade with integrated-optimized end wall contouring and root lean

Flow mechanism of a highly loaded low pressure turbine cascade with integrated-optimized end wall contouring and root lean

Effects of curved vanes on aerodynamic performance and flow structures in highly loaded tandem cascades

Numerical Simulation of Aerodynamic Heater: Effect of Blade Number

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