Performance Improvement of a Centrifugal Compressor by Passive Means

Sitaram, N.; Swamy, Shivakumara M

doi:10.1155/2012/727259

Cited by 4 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This improvement is attributed to the increased contraction coefficient of leakage flow. Sitaram and Swamy [12] also carried out similar investigations with partial shroud on the pressure surface side of the impeller blade tip of the present centrifugal impeller and reported similar findings.…”

Section: Introductionsupporting

confidence: 74%

Computational Investigation of Flow in a Centrifugal Impeller with Chamfered Blade Tips: Effects of Stage Loading and Tip Clearance

Sitaram¹,

Ushasri²

2020

IJFMTS

View full text Add to dashboard Cite

The objective of the present investigation is to examine the possibility of performance improvement, improvement of the exit flow uniformity and desensitization of the tip clearance effects on the performance of a low speed centrifugal impeller. Computational investigations using a commercial CFD software are undertaken. Six configurations of blade tips are investigated. They are square tip (Basic), tip chamfered on pressure surface (P1 and P2), tip chamfered on suction surface (P1 and P2) and tip chamfered on pressure and suction surfaces (PS1). Computations are carried out with optimized multiblock grids for these six configurations at five flow coefficients, namely 0.28 and 0.34 (below design flow coefficient), 0.42 (design flow coefficient) and 0.48 and 0.52 (above design flow coefficient) and at three values of tip clearance, viz., 1% (small value), 2% (nominal value) and 5% (large value) of the blade exit height. From the investigations, it is found that the impeller with the chamfer on suction surface shows small improvement in performance. In addition this configuration has minimum tip clearance sensitivity. A decrease in the chamfer on suction surface further may improve the impeller performance. A maximum percentage of 0.18% improvement in the total pressure coefficient is obtained at 5% tip clearance and a flow coefficient of 0.52 for configuration S2. However chamfer on the pressure surface deteriorates the impeller performance.

show abstract

Section: Introductionsupporting

confidence: 74%

Computational Investigation of Flow in a Centrifugal Impeller with Chamfered Blade Tips: Effects of Stage Loading and Tip Clearance

Sitaram¹,

Ushasri²

2020

IJFMTS

View full text Add to dashboard Cite

show abstract

“…In addition to the wind turbines, they have been investigated in centrifugal compressors [148], tractor-trailers [149] and aeroplanes [150]. As the active vortex generator jets, passive vortex generators are used for separation control.…”

Section: Turbulence and Vortex Generators (Classification: Passive Gmentioning

confidence: 99%

“…As the active vortex generator jets, passive vortex generators are used for separation control. In this review, dimples [65] and tripping devices (tapes) [148] are grouped into vortex generators.…”

Section: Turbulence and Vortex Generators (Classification: Passive Gmentioning

confidence: 99%

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Tiainen

Grönman

Jaatinen-Värri

et al. 2017

IJTPP

View full text Add to dashboard Cite

Abstract:The decrease in the performance of centrifugal compressors operating at low Reynolds numbers (e.g., unmanned aerial vehicles at high altitudes or small turbomachines) can reach 10% due to increased friction. The purposes of this review are to represent the state-of-the-art of the active and passive flow control methods used to improve performance and/or widen the operating range in numerous engineering applications, and to investigate their applicability in low-Reynolds-number centrifugal compressors. The applicable method should increase performance by reducing drag, increasing blade loading, or reducing tip leakage. Based on the aerodynamic and structural demands, passive methods like riblets, squealers, winglets and grooves could be beneficial; however, the drawbacks of these approaches are that their performance depends on the operating conditions and the effect might be negative at higher Reynolds numbers. The flow control method, which would reduce the boundary layer thickness and reduce wake, could have a beneficial impact on the performance of a low-Reynolds-number compressor in the entire operating range, but none of the methods represented in this review fully fulfil this objective.

show abstract

Passive flow control at impeller radial bend for stall delay in centrifugal compressors with fishtail pipe diffusers

Ashrafi,

2024

Aerospace Science and Technology

View full text Add to dashboard Cite

Performance Improvement of a Centrifugal Compressor by Passive Means

Cited by 4 publications

References 12 publications

Computational Investigation of Flow in a Centrifugal Impeller with Chamfered Blade Tips: Effects of Stage Loading and Tip Clearance

Computational Investigation of Flow in a Centrifugal Impeller with Chamfered Blade Tips: Effects of Stage Loading and Tip Clearance

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Passive flow control at impeller radial bend for stall delay in centrifugal compressors with fishtail pipe diffusers

Contact Info

Product

Resources

About