Effect of axial slot casing treatment on the flow instability for different speed ratios in a counter-rotating axial flow compressor

Wang, Lei; Mao, Xiaochen; Gao, Limin; Guo, Yanchao; Yu, Yi

doi:10.1016/j.ast.2023.108374

Cited by 7 publications

(1 citation statement)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rotor blades tip leakage flow is substantially influenced by the boundary layer structure formed on the endwalls 16 . Generally speaking, many passive and active methods are developed to control the boundary layer formed over solid walls of the objects exposed to the fluid flow, so far 17 , 18 . These methods are widely focused on controlling the onset of transition from laminar to turbulent flow or to delay the boundary layer separation point 19 .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of aerodynamic performance of axial compressors utilizing natural aspiration through optimized casing circumferential slot

Nejad,

Zenouz

2024

Sci Rep

View full text Add to dashboard Cite

This paper presents results of aerodynamic enhancement of axial compressors utilizing optimum natural aspiration through a circumferential slot made within the casing wall upstream the rotor blades row. The method of investigation is based on numerical simulation of flow field. Geometries of the slot walls were optimized to find the maximum stall margin and pressure ratio of the compressor. The optimum case is accompanied by boosting more momentum within the blades tip region through the slot. Consequently, tip leakage vortex flow weakens and compressor stability margin increases. Final results showed that in comparison to the untreated casing, the optimum geometry of the slot causes the total pressure ratio and stall margin to increase by 4.2% and 3%, respectively. This state-of-the-art technique is simple and economic which can be easily implemented in practical cases while the compressor is exposed to commencement of flow instabilities in the forms of the rotating stall or surge phenomena.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhancement of aerodynamic performance of axial compressors utilizing natural aspiration through optimized casing circumferential slot

Nejad,

Zenouz

2024

Sci Rep

View full text Add to dashboard Cite

show abstract

Concurrent and sequential coupled optimization design of a transonic compressor blade with axial slot casing treatment

Lu,

Zhu,

Teng

et al. 2024

Aerospace Science and Technology

View full text Add to dashboard Cite

Tip leakage flow of a vibrating airfoil in a linear compressor cascade

Shi,

Ma,

Wang

et al. 2023

Physics of Fluids

View full text Add to dashboard Cite

In turbomachinery, understanding the interaction between blade vibrations and the tip flow is of great interest due to current trends, which tend to thinner airfoils with higher loading and higher efficiencies. The present paper experimentally investigates the unsteady tip leakage flow/vortex (TLF/V) of a vibrating airfoil in a compressor cascade with a large tip gap subjected to bend-mode controlled oscillations. Tip wall pressure distribution and secondary tip flow in the blade channel were studied using high-response pressure measurements and stereoscopic particle image velocimetry. The effects of blade vibrations on the TLF field and the TLV wandering characteristics are explored. The experimental results demonstrate that the TLF field is dominated by the TLV, and the TLV synchronously wanders with the displacement of the blade. Besides, the vortex intensity, the vortex wandering intensity, and turbulence fluctuations are phase-shifted by π/2 concerning the displacement of the blade. In contrast, the velocity deficit in the vortex core is not influenced by blade vibrations. This study provides the phase-resolved tip flow field of a vibrating airfoil with tip gaps in a linear compressor cascade, which is a necessary step toward compressor blade vibration prediction.

show abstract

Effect of axial slot casing treatment on the flow instability for different speed ratios in a counter-rotating axial flow compressor

Cited by 7 publications

References 38 publications

Enhancement of aerodynamic performance of axial compressors utilizing natural aspiration through optimized casing circumferential slot

Enhancement of aerodynamic performance of axial compressors utilizing natural aspiration through optimized casing circumferential slot

Concurrent and sequential coupled optimization design of a transonic compressor blade with axial slot casing treatment

Tip leakage flow of a vibrating airfoil in a linear compressor cascade

Contact Info

Product

Resources

About