Numerical simulation of unsteady tip clearance flow in an isolated axial compressor rotor blades row

Taghavi-Zenouz, Reza; Eslami, Siamak

doi:10.1177/0954406211412154

Cited by 10 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using l 2 criterion, the point located in the vortex region requires l 2 5 0. Many researchers [14][15][16] have used l 2 to detect the vortex structures.…”

Section: Fluctuating Tip Clearance Flowmentioning

confidence: 99%

See 1 more Smart Citation

Investigations of rotating instability and fluctuating tip clearance flow in a low-speed axial compressor

Wang

Ouyang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

To investigate the relationship between rotating instability and fluctuating tip clearance flow, experimental tests as well as numerical studies are conducted on a 1.5 stage low-speed axial compressor rig. The rotating instability is detected through casing mounted dynamic pressure sensors. The phase-locked and root-mean-square pressure contours show that the interaction of tip clearance flow with the neighboring blade is the most likely cause of casing flow field fluctuation. From the calculated results of entire-annulus cascade, it is found that the tip clearance vortex structures oscillate periodically at low flow rate conditions. That leads to intense fluctuation of the casing flow field. Further, phase lag of pressure fluctuations exists between two neighboring passages, which induces a rotating pressure pattern of multiple frequencies. The frequency characteristics of this rotating pressure pattern caused by fluctuating tip clearance flow is coincident with the frequency of rotating instability. This suggests that the fluctuating tip clearance flow is the major contributor to the initiation of rotating instability.

show abstract

“…Using l 2 criterion, the point located in the vortex region requires l 2 5 0. Many researchers [14][15][16] have used l 2 to detect the vortex structures.…”

Section: Fluctuating Tip Clearance Flowmentioning

confidence: 99%

“…Fluctuating tip clearance flow has been confirmed to be the most prominent unsteady features near the casing. [13][14][15] Thus, it is meaningful to explore the relationship between the fluctuating tip clearance flow and rotating instability.…”

Section: Introductionmentioning

confidence: 99%

Investigations of rotating instability and fluctuating tip clearance flow in a low-speed axial compressor

Wang

Ouyang

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…Zhang et al 8 suggested that the strongest unsteadiness was located near 50% chord of the pressure surface in the tip region. Taghavi-Zenouz et al 9 suggested that the strongest unsteadiness occurred at the position where the TLF impinged on the pressure side of the adjacent blade. Li et al 10 established a relationship between the unsteady tip leakage flow (UTLF) and spike-type stall inception.…”

Section: Introductionmentioning

confidence: 99%

Investigation of tip leakage flow unsteadiness and rotating instability in a centrifugal compressor impeller

Wang

Yang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

A phenomenon called rotating instability was rarely reported in a centrifugal compressor, although some associated discussions can be found in axial compressors. This paper presents a numerical investigation on the unsteadiness of the tip leakage flow and rotating instability in an isolated centrifugal compressor impeller. A three-dimensional, unsteady full annuls simulation is performed under three different operating conditions. The tip leakage flow unsteadiness at the impeller inlet and inside the impeller passage is detected by the pressure fluctuation. During the throttling process, the temporal and spatial propagation characteristic of the tip leakage flow unsteadiness under the near stall operating condition is revealed based on the wavelet analysis, Fourier transform, and dynamic mode decomposition. Furthermore, the relationship between the tip leakage flow unsteadiness and the rotating instability is also discussed. The results show that the pressure fluctuation mainly concentrates in the tip region at the near stall operating condition, which indicates the occurrence and circumferential propagation of tip leakage flow unsteadiness. The circumferential propagation of the tip leakage flow unsteadiness induces a significant circumferential rotating pressure wave with a wave number of 9 and approximately 48.2% of the rotational speed of the impeller. The characteristic frequency of the tip leakage flow unsteadiness agrees well with the dominant mode frequency of rotating instability. Therefore, the tip leakage flow unsteadiness is assumed to be responsible for the rotating instability. During the throttling process, the formation and development of the rotating instability at near stall operating condition can be divided into three stages based on signal analysis: prior to rotating instability, generation and development, and rotating instability.

show abstract

“…Many studies use computational fluid dynamics (CFD) codes or numerical methods based on the Navier-Stokes equations to investigate the performance of hydrostatic journal bearings. [44][45][46][47][48][49][50][51] Moreover, the CFD can be applied to model liquid flow in complex geometries for which Reynolds equation is unsuited. In hybrid hydrostatic/hydrodynamic bearings, the velocity and pressure variations, the onset of turbulence at high speeds and the mixing of entrainment flow with injected fluid have all been analyzed using the CFD.…”

Section: Introductionmentioning

confidence: 99%

“…[45][46][47][48][49] CFD has also been applied to model lubricant flow in the gap between adjacent pad bearings. 50 To date, many studies have used CFD codes in their work [51][52][53][54] The present work deals with the analysis of the three-dimensional flow behaviors of the circular recess of the hydrostatic rotary table. Confining to the realistic geometries of the hydrostatic rotary table and work conditions of low rotation speed, only incompressible steady flow is investigated (Re i < 1400, Re s < 74.6).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional pressure- and shear-driven flow phenomena in a circular recess of a hydrostatic rotary table

Shen

Chen

Liu

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The three-dimensional pressure-and shear-driven flow phenomena in a circular recess of hydrostatic rotary table in heavy-duty computer numerical control machines is very complicated and has not been fully explored. Navier-Stokes equations have been applied through the whole flow region using a finite volume approach to explore this complicated flow phenomena, including the influences of feeding Reynolds number (Re i ), sliding Reynolds number (Re s ) and the recess geometry on flow behaviors. A test rig based on a particle image velocimetry was built to compare experimental and numerical results, finding a good agreement for stationary cases. The results show that the flow patterns in the recess are very complex and four three-dimensional vortices exist at Re i ¼ 448 and Re s ¼ 74.6. Four flow states are defined according to the structure of the vortices. Different sectional profiles of the streamlines and velocity vector fields are examined to reveal the mechanism of pressure-and shear-driven flow interactions. The results of influences of recess geometry on flow states and pressure patterns are intended to contribute to represent a database in view of the hydrostatic rotary table theoretical modeling.

show abstract

Numerical simulation of unsteady tip clearance flow in an isolated axial compressor rotor blades row

Cited by 10 publications

References 29 publications

Investigations of rotating instability and fluctuating tip clearance flow in a low-speed axial compressor

Investigations of rotating instability and fluctuating tip clearance flow in a low-speed axial compressor

Investigation of tip leakage flow unsteadiness and rotating instability in a centrifugal compressor impeller

Three-dimensional pressure- and shear-driven flow phenomena in a circular recess of a hydrostatic rotary table

Contact Info

Product

Resources

About