Characteristics of the Near Wake of a Compressor of a Fan Rotor Blade

Reynolds, B.; Lakshminarayana, B.; Ravindranath, A.

doi:10.2514/3.61258

Cited by 28 publications

(8 citation statements)

References 6 publications

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“…Experimental and numerical research to date has examined the mean velocity profile, the turbulence parameters, the wake decay and mixing rates, as well as the wake recovery under different parameter settings, such as blade loading, free-stream turbulence, rotation, etc. [1][2][3][4][5][6][7] Most of the experimental data have been obtained by single-point measurement, such as tri-axial hot-wire, split hot-film probes, five hole pitot tube, high response pressure transducer, and laser Doppler velocimetry. [1][2][3][4][5][6] The ability to examine the flow structure has improved significantly with the introduction of PIV ͑particle image velocimetry͒.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of the spatially filtered and ensemble averaged kinetic energy, the associated fluxes and scaling trends in a rotor wake

et al. 2005

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Particle image velocimetry data obtained in the rotor wake of a turbomachine are used for examining elements of the ensemble averaged and spatially filtered kinetic energy. These two distinct averaging processes decompose the kinetic energy into four parts, consisting of the mean-flow resolved, mean-flow subgrid, fluctuating resolved, and fluctuating subgrid parts. Their evolution equations include energy flux terms among these parts. The results elucidate the fundamental difference between the filtered turbulence ͑Reynolds͒ production and the ensemble averaged subgrid scale ͑SGS͒ dissipation rates. Each of these terms consist of three energy fluxes, but only one of them is common to both, the flux from the mean-flow resolved to the fluctuating subgrid kinetic energy parts. The other two elements of the SGS dissipation are the fluxes from the mean-flow resolved to the mean-flow subgrid parts and the fluctuating resolved to the fluctuating subgrid parts. Likewise, the other two contributions to the turbulence production are the fluxes from the mean-flow resolved to the fluctuating resolved parts and the mean-flow subgrid to the fluctuating subgrid parts. In order to examine the decay rates of the kinetic energy parts throughout the rotor wake, a new method for determining the scaling parameters is introduced. The mean-flow resolved and subgrid parts scale with the modified velocity defect squared, but the decay rates of the turbulence parts are slower.

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Section: Introductionmentioning

confidence: 99%

Decomposition of the spatially filtered and ensemble averaged kinetic energy, the associated fluxes and scaling trends in a rotor wake

et al. 2005

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“…In order to improve the fan efficiency and reduce the acoustic noise generated in the operation of axial fans, accurate measurements of flow field around the fan is not only essential, but also indispensable for future developments of different kinds of turbomachinery. Since the fan wake is a complicated three-dimensional flow, however, it is not easy to analyze the flow through theoretical and numerical means, leading experimental researches on axial fans (Reynolds and Lakshminarayana, 1979).…”

Section: Introductionmentioning

confidence: 99%

Velocity field measurements of swirl flow around a forward-swept axial fan using a phase-averaged PTV

Lee

Choi

Lee

2001

J Vis

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The flow characteristics around a rotating axial fan were experimentally investigated using a phase-averaged PTV velocity field measurement technique. The axial fan has 5 forward-swept blades with a radius of 25 mm. Measurements were carried out at 4 axial planes and 4 radial planes perpendicular to the axis of rotation. For the axial plane measurements, one fan blade was divided into 4 different phases in order to analyze the flow structure according to blade phase. For each case, 500 instantaneous velocity fields were measured and ensemble averaged to obtain phase-averaged velocity vector fields and vorticity contours. In addition, measurements were carried out at two planes around the blade surface. Phase averaged velocity fields show periodic variations with respect to the blade phase. The periodic shedding of the tip vortex at the blade tip is also observed. The phase averaged velocity fields measured in the radial planes show periodic variations according to the fan phase and the distance from the fan. These experimental results can be used to validate numerical calculations and to understand the flow characteristics of forward-swept axial fans.

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“…The wake decay has been examined by using several correlations presented in the same paper of Reynolds et al [10]. Reynolds et al described three di!erent wake decay correlations.…”

Section: Fan Face Flow Distortionmentioning

confidence: 99%

“…Using the same data correlation technique described by Reynolds et al [10], the similarity rule has been examined for the IGV wake measurements, reported in this paper, in the environment of the 2-D inlet. As shown in Figure 12, the similarity was found at two di!erent speeds tested with the #at plate IGV, under the condition of the upstream ramp wake interaction in the 2-D bifurcated inlet, i.e., the IGV wakes followed the same Gauss' function exp( !0)693 ).…”

Section: Fan Face Flow Distortionmentioning

confidence: 99%

An Experimental Investigation of the Aeroacoustics of a Two-Dimensional Bifurcated Supersonic Inlet

Hanuska

2001

Journal of Sound and Vibration

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Characteristics of the Near Wake of a Compressor of a Fan Rotor Blade

Cited by 28 publications

References 6 publications

Decomposition of the spatially filtered and ensemble averaged kinetic energy, the associated fluxes and scaling trends in a rotor wake

Decomposition of the spatially filtered and ensemble averaged kinetic energy, the associated fluxes and scaling trends in a rotor wake

Velocity field measurements of swirl flow around a forward-swept axial fan using a phase-averaged PTV

An Experimental Investigation of the Aeroacoustics of a Two-Dimensional Bifurcated Supersonic Inlet

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