Influence of Upstream and Downstream Compressor Stators on Rotor Exit Flow Field

Key, Nicole L.

doi:10.1155/2014/392352

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…The stator vanes in this facility are all shrouded without hub clearances. Additional information related to the airfoil geometry can be found in [14]. The compressor casing was machined with tight tolerances to create the best possible vehicle for tip leakage flow measurements.…”

Section: Compressor Facilitymentioning

confidence: 99%

Experimental Investigation of Factors Influencing Operating Rotor Tip Clearance in Multistage Compressors

Berdanier

Key

2015

International Journal of Rotating Machinery

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An analysis of compressor rotor tip clearance measurements using capacitance probe instrumentation is discussed for a three-stage axial compressor. Thermal variations and centrifugal effects related to rotational speed changes affect clearance heights relative to the assembled configuration. These two primary contributions to measured changes are discussed both independently and in combination. Emphasis is given to tip clearance changes due to changing loading condition and at several compressor operating speeds. Measurements show a tip clearance change approaching 0.1 mm (0.2% rotor span) when comparing a near-choke operating condition to a near-stall operating condition for the third stage. Additional consideration is given to environmental contributions such as ambient temperature, for which changes in tip clearance height on the order of 0.05 mm (0.1% rotor span) were noted for temperature variations of 15°C. Experimental compressor operating clearances are presented for several temperatures, operating speeds, and loading conditions, and comparisons are drawn between these measured variations and predicted changes under the same conditions.

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Section: Compressor Facilitymentioning

confidence: 99%

Experimental Investigation of Factors Influencing Operating Rotor Tip Clearance in Multistage Compressors

Berdanier

Key

2015

International Journal of Rotating Machinery

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Considerations for Measuring Compressor Aerodynamic Excitations Including Rotor Wakes and Tip Leakage Flows

Smith

Murray

Key

2015

Journal of Turbomachinery

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The unsteady flow field generated by the rotor provides unsteady aerodynamic excitations to the downstream stator, which can result in vibrations such as forced response. In this paper, measurements of the rotor wake and rotor tip leakage flow from an embedded rotor in a multistage axial compressor are presented. A unique feature of this work is the pitchwise traverse of the flow field used to highlight the changes in the rotor exit flow field with respect to the position of the surrounding vane rows. Results acquired at midspan focus on characterizing an average rotor wake, including the effects on the frequency spectrum, from a forced response perspective. While many analyses use an average rotor wake to characterize the aerodynamic forcing function to the downstream stator, this study explores the factors that influence changes in the rotor wake shape and the resulting impact on the spectrum. Additionally, this paper investigates the flow near the endwall where the tip leakage vortex is an important contributor to the aerodynamic excitations for the downstream vane. For the first time, experimental data are presented at the rotor exit, which show the modulation in size and radial penetration of the tip leakage vortex as the rotor passes through the upstream vane wake. As computational models become more advanced, the ability to incorporate these aerodynamic excitation effects should be considered to provide better predictions for vane vibratory response.

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Influence of Upstream and Downstream Compressor Stators on Rotor Exit Flow Field

Cited by 2 publications

References 23 publications

Experimental Investigation of Factors Influencing Operating Rotor Tip Clearance in Multistage Compressors

Experimental Investigation of Factors Influencing Operating Rotor Tip Clearance in Multistage Compressors

Considerations for Measuring Compressor Aerodynamic Excitations Including Rotor Wakes and Tip Leakage Flows

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