Characterization of the tip clearance flow in an axial compressor using 3-D digital PIV

Wernet, Mark P.; Zante, Dale Van; Strazisar, Tony J.; John, Wentworth T.; Prahst, Patricia S.

doi:10.1007/s00348-005-0007-7

Cited by 26 publications

(16 citation statements)

References 7 publications

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“…Stauter [16] studied the character of the tip leakage vortex in the flow field between the compressor blade rows and within the rotating blade passages of a two-stage axial compressor model using a twocolour five-beam LDV. Wernet et al [17] acquired trajectory and unsteady behaviour of the tip leakage vortex at peak efficiency and near-stall operating conditions in a low-speed compressor rotor using phase-locked three-dimensional digital particle image velocimetry (PIV). Muthanna and Devenport [18] have summarized extensive research on the flow in the passage and immediate downstream of the compressor linear cascade and axial pump.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the plane of symmetry flow structure upstream of blunt bodies with tip clearance

Khan

Tay

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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Flow field in the plane of symmetry, upstream of circular and square cross-section blunt bodies mounted perpendicular to a flat plate with varying clearance between the obstacle tip and the flat plate, was experimentally studied in a water tunnel for a Reynolds numbers of 1400-3100. Qualitative aspects of the flow were captured using flow visualization. Detailed mapping of the flow field was carried out using planar particle image velocimetry (PIV). The existence of a multiple vortex system with characteristics similar to that of end-wall flows of surface-mounted obstacles with zero gap was noted. For large gap values, a jet-like flow was observed in the flow visualization; however, PIV measurements revealed the presence of the characteristic juncture vortex system even for such a configuration. The primary vortex of the square cylinder was observed to be further upstream as compared with the circular cylinder and moved closer to the cylinder surface with increasing Reynolds number. The vortex system for the square cylinder oscillated at a higher frequency. Increasing the tip gap resulted in the upstream movement of the primary vortex and reduction in amplitude and frequency of oscillation for both the cross-sections. The end-wall flow for the square cross-section cylinder was found to be more sensitive to variation in the tip gap.

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Section: Introductionmentioning

confidence: 99%

Experimental study of the plane of symmetry flow structure upstream of blunt bodies with tip clearance

Khan

Tay

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Jang [4] investigated the vortex structure in a propeller fan using LDV measurements and then proposed three vortex structures including the tip vortex, leading edge separation vortex and tip leakage vortex. Wernet et al [5] used PIV measurements to characterize the behavior of the rotor tip clearance flow in an axial compressor. The results showed that high flow rate led to a larger tip clearance vortex and larger flow blockage in the passage than that of the design flow rate.…”

Section: Introductionmentioning

confidence: 99%

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

et al. 2017

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Tip clearance between blade end and shroud is inevitable in pump operation and of great importance on pump energy performance and pressure fluctuation. As the tip clearance size increases, the head and efficiency of the mixed flow pump drop accordingly. The simulation results show that the development of a leakage vortex is observed as the tip clearance increases, and the trajectory of this leakage vortex remains in the same direction along the blade suction side for different tip clearances. With the increase in tip clearance size, the intensity of the leakage vortex is enhanced, and the separation between the main leakage vortex and the secondary leakage vortex is also strengthened. The leakage separation angle near the blade tip remains at the same value of 10° for different tip clearance sizes. As for the spectrum analysis, the maximum amplitudes of pressure fluctuations dramatically increase in the impeller when the tip clearance increases from 0.0 mm to 1.0 mm, and the dominant frequencies go from 145 Hz to 184 Hz due to the considerable leakage flow.

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“…Stauter [16] studied the character of the tip leakage vortex in the flow field between the compressor blade rows and within the rotating blade passages of a two-stage axial compressor model using a two-color five-beam LDV. Wernet et al [17] acquired trajectory and unsteady behavior of the tip leakage vortex at peak efficiency and near stall operating conditions in a low speed compressor rotor using phase-locked three-dimensional digital particle image velocimetery (PIV). Muthanna and Devenport [18] have summarized the extensive research of the flow in the passage and immediate downstream of compressor linear cascade and axial pump.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Modeling of Tip Leakage Flow over a Cylinder

Khan

2013

43rd Fluid Dynamics Conference

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Flow field in the plane of symmetry upstream of circular cylinder mounted perpendicular to a flat plate with varying clearance between the cylinder tip and the flat plate is numerically investigated. The results were compared with an experimental study of the configuration. The existence of a multiple vortex system with characteristics similar to that of end-wall flows of surface-mounted obstacles with zero gap was captured by the numerical method. The influence of gap size and Reynolds numbers was also investigated. The results were in good comparison with the experimental data. It has been found that the vortex system structure depends on the free stream Reynolds number; and an increase in the tip gap size caused a shift in the location of vortex system and bifurcation streamline due to increase tip leakage flow. Nomenclature ρ = density (kg/m 3 ) e = total energy per unit mass (kJ kg -1 ) F = inviscid flux-matrices d F = diffusive flux-matrices I = identity tensor p = pressure (Pa) Q = field vector t = time (second)       = v u U  = velocity vector (ms -1 ) y x , = Cartesian coordinates µ = dynamic viscosity (kgm -1 s -1 ) γ = ratio of specific heats φ = generalized quantity subscripts ∞ = free stream condition

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Characterization of the tip clearance flow in an axial compressor using 3-D digital PIV

Cited by 26 publications

References 7 publications

Experimental study of the plane of symmetry flow structure upstream of blunt bodies with tip clearance

Experimental study of the plane of symmetry flow structure upstream of blunt bodies with tip clearance

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

Three-Dimensional Numerical Modeling of Tip Leakage Flow over a Cylinder

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