Determining the actual separation size in a bowl centrifuge

D. E. Shkoropad

doi:10.1007/bf01150918

Evaluation of Separation Efficiency in Tubular Bowl Centrifuge

Chemical Engineering & Technology ◽

10.1002/ceat.202100055 ◽

2021 ◽

Author(s):

Sumayabanu Patan ◽

Satish K. Velaga ◽

V. S. Sanapala ◽

K. Ananthasivan

Keyword(s):

Separation Efficiency ◽

Bowl Centrifuge

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Improved compressor corner separation prediction using the quadratic constitutive relation

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1177/0957650917709367 ◽

2017 ◽

Vol 231 (7) ◽

pp. 618-630 ◽

Cited By ~ 3

Author(s):

Xinrong Su ◽

Xin Yuan

Keyword(s):

Constitutive Relation ◽

Eddy Viscosity ◽

Pressure Coefficient ◽

Momentum Equation ◽

Viscosity Model ◽

Corner Separation ◽

Pressure Loss Coefficient ◽

Eddy Viscosity Model ◽

Relation Model ◽

Separation Size

This work presents the implementation and study of the quadratic constitutive relation nonlinear eddy-viscosity model with representative compressor application, for which the corner separation has been poorly predicted with the widely used linear Boussinesq eddy-viscosity model. With the introduction of the Reynolds stress anisotropy, the secondary flow of the second kind and its effect on the corner flow can be well captured and this results in greatly improved prediction of pressure coefficient, total pressure loss coefficient and the corner separation size. Without the quadratic constitutive relation model, the separation size and loss are generally over-estimated. The mechanism of the improvement is studied using both the vortex dynamics and the momentum equation. It is proved that quadratic constitutive relation model consumes low CPU time and provides much improved compressor corner separation prediction without worsening the convergence property.

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Performance evaluation of a tubular bowl centrifuge by using laser obscuration method as an online measurement tool

Separation Science and Technology ◽

10.1080/01496395.2019.1611853 ◽

2019 ◽

Vol 55 (10) ◽

pp. 1839-1851

Author(s):

Amit Kumar ◽

V. Subramanian ◽

Satish K. Velaga ◽

J. Kodandaraman ◽

P. N. Sujatha ◽

...

Keyword(s):

Performance Evaluation ◽

Measurement Tool ◽

Online Measurement ◽

Bowl Centrifuge

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Design of Compressor Endwall Velocity Triangles

Journal of Turbomachinery ◽

10.1115/1.4035233 ◽

2017 ◽

Vol 139 (6) ◽

Cited By ~ 2

Author(s):

Kiran Auchoybur ◽

Robert J. Miller

Keyword(s):

Dynamic Pressure ◽

Three Dimensional ◽

Flow Region ◽

Degree Of Freedom ◽

Diffusion Limit ◽

Local Geometry ◽

Operating Range ◽

Blade Row ◽

Inlet Conditions ◽

Separation Size

The operating range of a compressor is usually limited by the rapid growth of three-dimensional (3D) separations in the endwall flow region. In contrast, the freestream region is not usually close to its diffusion limit and has little effect on overall range. In light of these two distinct flow regions, this paper considers how velocity triangles in the endwall region should be designed to give a more balanced spanwise failure across the span of a blade row. In the first part of this paper, the sensitivity of 3D separations in a single blade row to variations in realistic multistage inlet conditions and endwall geometry is investigated. It is shown that a blade's 3D separation size is largely controlled by the dynamic pressure within the incoming endwall “repeating stage” boundary layer and not the detailed local geometry within the blade row. In the second part of this paper, the traditional design process is “flipped.” Instead of redesigning a blade's endwall geometry to cope with a particular inlet profile into the blade row, the endwall region is redesigned in the multistage environment to “tailor” the inlet profile into downstream blade rows, giving the designer a new extra degree-of-freedom. This extra degree-of-freedom is exploited to balance freestream and endwall operating range, resulting in a compressor having an increased operating range of ∼20%. If this increased operating range is traded with reduced blade count, it is shown that a design efficiency improvement of ∼0.5% can be unlocked.

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