Axial compressor blades tip leakage flow control using natural aspiration

Nejad, Peyman Ghashghaie; Zenouz, Reza Taghavi

doi:10.1038/s41598-023-49391-9

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…In the previous study of the present authors 27 , the challenges associated with blades tip leakage flow in axial compressors were addressed through the exploration of three distinct strategies: circumferential tape, S-shape nozzle and natural aspiration slot, all imposed upstream the rotor blades row. Aerdynamics of each of the above-mentioned technique was compared with results of the untreated case.…”

Section: Introductionmentioning

confidence: 99%

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

Nejad,

Zenouz

2024

Sci Rep

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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.

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Section: Introductionmentioning

confidence: 99%

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

Nejad,

Zenouz

2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

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Unsteady CFD simulation of a rotor blade under various wind conditions

Kasmaiee,

Farshad

2024

Sci Rep

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Wind and gusts can significantly impact the performance of rotors and turbines. The transient behavior of the rotor should be carefully examined to account for these effects. This paper investigates the unsteady aerodynamic characteristics of a rotor blade under different wind conditions, such as direction, speed, and angle. A 3D transient Computational Fluid Dynamics (CFD) simulation using the dynamic mesh technique is performed to analyze the rotor dynamics. The unsteady Reynolds-averaged Navier–Stokes (URANS) equations with the k-ω SST turbulence model are solved. The rotor blade used for this study is the U15XXL Combo KV29 industrial blade, which has not been numerically analyzed before. The results show that wind in the same direction as the rotation reduces the thrust more than lateral or opposite wind. Lateral wind with a speed lower than 5 m/s decreases the blade performance, but higher speeds increase it. Higher lateral wind speeds also cause two peaks in the torque curve, forming a butterfly wing shape in the polar torque plot and multiple extrema in the torque curve with increasing speed. The maximum thrust shifts slightly to the left with increasing lateral wind speed. The lateral angle does not affect the average thrust produced in one blade revolution but only causes a spatial shift. The thrust production decreases as the angle approaches the opposite direction of rotation. The motion amplitude decreases, and the curve becomes smoother as this angle increases. A nearly straight line similar to no side wind is observed at 60 and 90 degrees, which is attributed to the constant effective angle of attack during the rotation cycle.

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Axial compressor blades tip leakage flow control using natural aspiration

Cited by 2 publications

References 15 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

Unsteady CFD simulation of a rotor blade under various wind conditions

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