Investigation the Effect of Blade’s Slot on Rotating Stall of High Speed Blower

Kassim, Muna S.; Saleh, Fouad A.; Aliwi, Alaa Thayer

doi:10.31272/jeasd.23.4.12

Cited by 1 publication

(1 citation statement)

References 3 publications

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“…The results showed an enhancement in the pressure distribution and fluid movement between the impeller passages. Also, reducing the slot width to 2mm with the same slot jet angle at a different location of 70 % from the leading edge, as reported by [5] reduced the pressure variations and energized the leakage flow. [6]performed unsteady numerical simulations of slot cuts near the impeller shroud and found that blade surface slots improved performance and flow field by 3.6 % for total pressure and 2.6 % for efficiency at the design mass flow rate.…”

Section: Introductionmentioning

confidence: 75%

Effect of Blade Slot Inclination Angle on Flow Separation in The Centrifugal Fan Impeller

Beskales,

Shahin,

Ayad

et al. 2023

Engineering Research Journal (Shoubra)

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The use of slotted blades for centrifugal fan impellers improves fluid flow steadiness and reduces fan noise. The slots create a jet of fluid from the pressure side to the suction side that increases the momentum of the main flow and postpones t he flow separation. In addition, these slots make the fluid movement smoother and more efficient in impeller passages. In previous research, the optimum slot location was determined at 40% from the leading edge (at diameter Ds=0.65 DImpeller) with a 2.5 mm width. The present research concentrates on determining the optimum slot jet angle of a ten-blade backward curved centrifugal fan at the best efficiency point (BEP). Six values of slot inclination angles, namely θS1, θS2, θS3, θS4, θS5 and θS6, ranging from an inward slot direction of (+60°) to an outward direction of (-80°), are simulated numerically using an unsteady Computational Fluid Dynamics (CFD) model. The CFD results have proven the benefits of the outward slots that ranged from (θS= -60° to -80°) on stall control of the fluid on the blade suction side compared with the inward slots. At the BEP, the computed performance of the tested fan with an outward slot inclination angle θS6 =-80° showed a 2.6 percent efficiency improvement compared to fans with an inward slot of θS1=+60°. Generally, the outward slot direction has a positive effect on the boundary layer attachment on the suction side of the blade.

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Section: Introductionmentioning

confidence: 75%