Effects of casing treatment on behavior of tip leakage flow in an isolated axial compressor rotor blade row

Taghavi-Zenouz, Reza; Eslami, Siamak

doi:10.1080/02533839.2012.747058

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…So far, different shell shapes have been designed and tested to increase the compressor operating range. Among the various shell modification methods that have been studied so far, we can mention the circumferential groove [1], slot [2], and stepped tip gap [3]. Many researchers have studied various shell modification methods in axial and centrifugal compressors, to extend the range of stable compressor performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Grooving the Flow Passage on the Flow Characteristics of the Fluid Passing Through the Cylindrical with a Rotating Cylinder

Hassani¹,

Ebrahimi²,

Rahmani³

et al. 2023

JREAS

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Screw compressors belong to the group of positive displacement machines, which are widely used in various industries due to the advantages of these compressors compared to other industrial compressors. The distance between the moving and fixed parts of the rotating equipment is inevitable. This distance causes current leakage in all types of compressors, which reduces the efficiency of the compressor. In this research, the effect of grooving the flow passage on the flow characteristics of the passing fluid has been investigated using ANSYS CFX software. The simulation quality of positive displacement machines strongly depends on the correct prediction of the leakage current between the existing switches. It seems that creating a groove in the path of the passing current increases the thickness of the boundary layer, which acts as a barrier against the return leakage current between the rotor and the stator in the compressor. In this paper, a simplified model of the problem, which is a grooved cylinder in which a piston rotates, is investigated. First, the flow of fluid from a cylinder whose inner surface is smooth is examined, and then in boundary conditions and similar geometric dimensions, the effect of different types of grooves with different geometries on the flow characteristics will be studied. The variable is the change in drag force on the inner surfaces of the cylinder. The results show that in the best case, ie a cylinder with a single helical groove, the drag force compared to smooth geometry is 1.79 times and the flow rate is reduced by 13.21%. It is expected that the results of this study can be generalized to reduce leakage current between the rotor and the screw compressor housing.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Grooving the Flow Passage on the Flow Characteristics of the Fluid Passing Through the Cylindrical with a Rotating Cylinder

Hassani¹,

Ebrahimi²,

Rahmani³

et al. 2023

JREAS

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“…Stepped tip gap can extend the stability margin of the compressor without any considerable negative effect on its efficiency. 8 Few studies are available on stepped tip gap and all of them are focused on axial compressors. There are still many unanswered questions about exact mechanisms of the stepped tip gap on the flow field and the compressor operating range School of Mechanical Engineering, Iran University of Science and Technology, Iran without detriment of stage efficiency.…”

Section: Introductionmentioning

confidence: 99%

Stall margin improvement of a centrifugal compressor utilizing various stepped tip gap configurations

Taghavi-Zenouz

Solki

Afshari

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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Aerodynamic performance of a centrifugal compressor is investigated under various casing treatment configurations of stepped tip gap type, numerically. This technique is introduced as an effective method for improvement of compressor stall margin and consequent enhancement of the compressor overall performance. In this respect, flow field within the proposed compressor was simulated by solving the Navier–Stokes equations utilizing the well-known k-ɛ turbulence model. Different geometries of the compressor stepped tip gap were examined to be able to obtain the optimum configuration. Results of velocity contours and streamlines patterns on various azimuthal and meridional planes showed that the stepped tip gap can weaken the tip leakage flow strength and reduce the blockage to the main stream near the casing. Hence, it can be concluded that using stepped tip gap can extend the stable operating range of the compressor and delay the occurrence of stall phenomenon. For small clearances, stepped tip gap was found to improve the stall margin of the proposed compressor at different rotor speeds without any negative effects on its efficiency, except to high flow conditions. But, inclusion of the stepped tip gap with large clearances tends to increase the stall margin with considerable reduction in the compressor efficiency.

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Performance improvement of axial compressor by introduction of circumferential grooves

Ahmad

Zheng

Fawzy

et al. 2020

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Effects of casing treatment on behavior of tip leakage flow in an isolated axial compressor rotor blade row

Cited by 6 publications

References 23 publications

Analysis of the Effect of Grooving the Flow Passage on the Flow Characteristics of the Fluid Passing Through the Cylindrical with a Rotating Cylinder

Analysis of the Effect of Grooving the Flow Passage on the Flow Characteristics of the Fluid Passing Through the Cylindrical with a Rotating Cylinder

Stall margin improvement of a centrifugal compressor utilizing various stepped tip gap configurations

Performance improvement of axial compressor by introduction of circumferential grooves

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