Effects of different suction angles on flow structures and dissipation in the wake of a circular cylinder

Zhong, Yafei; Ma, Hongwei; Yun, Di; Guo, Junde; Xu, Bo

doi:10.1016/j.oceaneng.2022.112521

Cited by 4 publications

(1 citation statement)

References 43 publications

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“…POD is known to extract coherent vortex structures from the transient flow field into a set of spatial correlation functions. The high computational efficiency decomposition method of POD proposed by Sirovich [47], called snapshot POD, has been widely used in fluid coherent structures decomposition [31,39,48,49]. In the literature [50], a detailed introduction of the snapshots POD can be learned.…”

Section: A Analysis Of Vortex Coherent Structure Spatial Characteristicmentioning

confidence: 99%

Analysis of Tip Leakage Vortex Instability and Blade Force in a Low-Speed Compressor Cascade

Wang,

Ma,

Yang

et al. 2023

Preprint

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Turbulence model Detached Eddy Simulation (DES) is utilized to conduct detailed research on the tip leakage flow (TLF) instability and its influence on the compressor cascade blade static pressure distribution. The objectives are to investigate the tip leakage flow instability and blade aerodynamic force oscillation at 0deg incidence design state. This research found that the trailing edge leakage vortex and the secondary leakage vortex mixed with the leakage vortex along the backflow direction and involved into the main leakage flow, which is close to the adjacent blade pressure side. The trailing edge broken tip leakage vortex has influenced the adjacent blade pressure side static pressure distribution and vorticity transformation in the tip region. More substantial convective effects are captured in 0.95span compared with 0.7span, based on the vorticity transport equation, which confirmed the tip leakage vortex caused momentum transfer in the tip region occupies a dominant role among the spanwise. The vortex core identification has revealed the tip leakage vortex wandering in the passage. The data-driven decomposition methods proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) helped clarify that the tip leakage vortex has a distinct influence on the adjacent blade pressure side static pressure spatial distribution. The frequency spectrum analysis of blade aerodynamic force indicated that some frequency components are close to the monitored tip region velocity. Then, the DMD characteristic frequency and POD time coefficient frequency corresponding with the mode vortex cohesive structure filled the gap in visualizing the vortex structure with its characteristic frequency, which caused the blade aerodynamic oscillation. Tip leakage vortex instabilities and their influence on the blade are well analyzed. Predicted tip leakage vortex instabilities and the blade force oscillation can utilized in the compressor blade vibration design and flow control.

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Section: A Analysis Of Vortex Coherent Structure Spatial Characteristicmentioning

confidence: 99%

Analysis of Tip Leakage Vortex Instability and Blade Force in a Low-Speed Compressor Cascade

Wang,

Ma,

Yang

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Blade aerodynamic force and tip region vortex spatial-temporal evolution study of a compressor cascade

Wang,

Ma,

Zhong

et al. 2024

Aerospace Science and Technology

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Information transfer between tip leakage vortex and blade aerodynamic force of a compressor cascade

Wang,

Ma,

Yang

et al. 2024

Aerospace Science and Technology

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Effects of different suction angles on flow structures and dissipation in the wake of a circular cylinder

Cited by 4 publications

References 43 publications

Analysis of Tip Leakage Vortex Instability and Blade Force in a Low-Speed Compressor Cascade

Analysis of Tip Leakage Vortex Instability and Blade Force in a Low-Speed Compressor Cascade

Blade aerodynamic force and tip region vortex spatial-temporal evolution study of a compressor cascade

Information transfer between tip leakage vortex and blade aerodynamic force of a compressor cascade

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