Two-point measurements in the wake of a compressor cascade

Wenger, Christian W.; Devenport, William J.; Wittmerf, Kenneth S.; Muthanna, Chittiappa

doi:10.2514/6.1998-2556

Cited by 11 publications

(4 citation statements)

References 4 publications

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“…Previous experimental studies (e.g., Wenger et al [1]; Kameier and Neise [2]) indicate that the low pressure fluctuations can result from the turbulence associated with the tipleakage vortex. Detailed measurements by Zierke et al [3] in a high-Reynolds-number pump facility have shown that the relative size of the rotor tip-clearance significantly influences the evolution of tip vortex and resultant cavitation.…”

Section: Introductionmentioning

confidence: 96%

Large-eddy simulation of a rotor tip-clearance flow

You

Mittal²,

wang³

et al. 2002

40th AIAA Aerospace Sciences Meeting &Amp; Exhibit

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A large-eddy simulation (LES) solver which combines an immersed-boundary technique with a curvilinear structured grid has been developed to study the temporal and spatial dynamics of a rotor tip-clearance flow, with the objective of determining the underlying mechanisms for low pressure fluctuations downstream of the rotor near the endwall. Salient feature of the numerical methodology, including the mesh topology, the treatment of numerical instability for non-dissipative schemes in a highly skewed mesh, and the parallelization of the code for shared memory platforms are discussed. Qualitative agreements have been observed between present LES and experimental measurements. The simulations indicate that the interaction between the moving endwall boundary layer and blade boundary layers and tip-leakage flow creates a highly complicated flow which is dominated by distinct vortical structures including the tip-leakage and tip-separation vortices. These vortical structures are found to convect downstream, expand in size and generate intense turbulent fluctuations in the endwall region.

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Section: Introductionmentioning

confidence: 96%

Large-eddy simulation of a rotor tip-clearance flow

You

Mittal²,

wang³

et al. 2002

40th AIAA Aerospace Sciences Meeting &Amp; Exhibit

View full text Add to dashboard Cite

show abstract

“…Because this information is not generally available, the turbulence is usually assumed to behave as though it were homogeneousand isotropic, and von Kármán's interpolation formula or a similar function is used. In fact, the upwash correlation function in wake ows is quite different from that implied by von Kármán's interpolation; for example, see Devenport et al, 3 Wittmer et al, 4 and Wenger et al 5 It is dominated by the anisotropyand inhomogeneityvisiblein the mean ow and its expression in the large-eddy structure of the turbulence. Devenport et al 3 show that these differences can have a signi cant effect on the broadband noise generated.…”

Section: Introductionmentioning

confidence: 96%

Two-Point Descriptions of Wake Turbulence with Application to Noise Prediction

Devenport

Muthanna

et al. 2001

AIAA Journal

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Measurements of the four-dimensional two-point correlation tensor of a fully developed airfoil wake are presented. These data allow examination of the characteristic eddies of the turbulence through proper orthogonal decomposition and linear stochastic estimation. A simple generic technique has been developed to extrapolate the correlation tensor function from the Reynolds stress eld based on the hypothesis that its form is largely determined by the constraints imposed by inhomogeneity and continuity. Estimates for the plane wake compare favorably with measurements, and, interestingly, proper orthogonal modes and characteristic eddy structures inferred from the estimates are similar to those obtained from measurements. This implies that these measures of the correlation function are largely determined by fairly basic physical information, suggesting some simpli cation of the turbulence-modeling problem for applications such as aeroacoustics.

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“…Also, the tip-clearance is responsible for a significant portion of performance losses in turbines and the blade-tip is known to be susceptible to damage from excessive thermal loading [2]. These issues have motivated a number of experimental and computational investigations of the tip-leakage flow configuration [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…1), the rotor tip-clearance is also considered to be the cause for low-pressure fluctuations downstream of the rotor in the vicinity of the endwall. Experimental studies of the incompressible rotor tip-clearance flow [3][4][5] indicate that the low pressure fluctuations can result from the turbulence associated with the tip-leakage vortex. Pressure measurements of Kang and Hirsch [6,7] show that the tip-leakage vortex dominates much of the endwall flow region.…”

Section: Introductionmentioning

confidence: 99%

A Computational Methodology for Large-Eddy Simulation of Tip-Clearance Flows

You

Mittal

Wang

et al. 2003

Volume 1: Fora, Parts A, B, C, and D

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A large-eddy simulation (LES) solver which combines an immersed-boundary technique with a curvilinear structured grid has been developed to study the temporal and spatial dynamics of an incompressible rotor tip-clearance flow. The overall objective of these simulations is to determine the underlying mechanisms for low-pressure fluctuations downstream of the rotor near the endwall. Salient features of the numerical methodology, including the mesh topology, the immersed boundary method, the treatment of numerical instability for non-dissipative schemes on highly skewed meshes, and the parallelization of the code for shared memory platforms are discussed. The computational approach is shown to be capable of capturing the evolution of the highly complicated flowfield characterized by the interaction of distinct blade-associated vortical structures with the turbulent endwall boundary layer. Simulation results are compared with experiments and qualitative as well as quantitative agreement is observed.

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Two-point measurements in the wake of a compressor cascade

Cited by 11 publications

References 4 publications

Large-eddy simulation of a rotor tip-clearance flow

Large-eddy simulation of a rotor tip-clearance flow

Two-Point Descriptions of Wake Turbulence with Application to Noise Prediction

A Computational Methodology for Large-Eddy Simulation of Tip-Clearance Flows

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