An Experimental Study of Vane Clocking Effects on Embedded Compressor Stage Performance

Key, Nicole L.; Lawless, Patrick B.; Fleeter, Sanford

doi:10.1115/gt2008-51087

Cited by 10 publications

(10 citation statements)

References 23 publications

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“…Clocking configuration CL LE was the maximum efficiency configuration and CL MP was the worst efficiency configuration, similar to the turbine vane clocking results in the literature. Although details associated with the efficiency measurements can be found in [20], the focus of this paper is on using unsteady data to illuminate the flow physics responsible for this change in efficiency.…”

Section: Experimental Methodsmentioning

confidence: 99%

Vane Clocking in a Three-Stage Compressor: Frequency Domain Data Analysis

Key

Lawless

Fleeter

2009

Journal of Propulsion and Power

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Blade row interactions affect compressor performance and durability. As design systems expand to account for these interactions, a better understanding of the underlying physics is necessary. In this paper, results from a vane clocking experiment in a three-stage compressor are discussed. Efforts are focused on the second stage, specifically the change in stator 2 wake profiles with respect to the placement of the stator 1 wake. The two clocking conditions presented position the wake from stator 1 at the leading edge of stator 2 and in the middle of the stator 2 passage. The time-accurate data are Fourier decomposed to determine the relative magnitudes of the frequencies in the spectrum. With data acquired at 50 circumferential locations spanning one vane passage for each clocking configuration, an enormous amount of data is collected, and a useful method for synthesizing this information is presented. Results show that, by placing the stator 1 wake at the leading edge of stator 2, the stator 2 boundary-layer response to the large incidence variations associated with the rotor 2 wakes is dampened, resulting in a thinner and more shallow stator 2 wake. Nomenclature CL LE = clocking configuration that positions stator 1 wake at leading edge of stator 2 CL MP = clocking configuration that positions stator 1 wake in the middle of the stator 2 passage f = frequency m c = corrected mass flow rate P o = total pressure R = rotor S = stator U = wheel speed V = flow velocity in the absolute reference frame = absolute flow angle = adiabatic efficiency

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Section: Experimental Methodsmentioning

confidence: 99%

Vane Clocking in a Three-Stage Compressor: Frequency Domain Data Analysis

Key

Lawless

Fleeter

2009

Journal of Propulsion and Power

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“…For example, Gundy-Burlet et al 19 and Dorney et al 17 concluded that the optimal combination of high efficiency occurred when the upstream stator wake was convected along the pressure surface of the downstream stator. On the contrary, He et al, 20 Hongyan et al, 16 Key et al, 18 and Fruth et al 21 observed maximum efficiency when the first stage/rotor wakes impinge on the leading edges of the second-stage rotor/stator, respectively. Städing et al 15 found best performance when the upstream rotor or stator wakes propagate near mid-passage of the clocked blade row.…”

Section: Guide Vane Rotormentioning

confidence: 97%

“…That the relation of clocking position and efficiency has a sinusoidal shape with typical variations within the range of 0.2 up to 2.7%, [13][14][15] is nowadays commonly accepted. [16][17][18] However, controversial findings have been reported regarding the optimal impingement location of the upstream stator wake on the downstream stator vane to maximise efficiency. For example, Gundy-Burlet et al 19 and Dorney et al 17 concluded that the optimal combination of high efficiency occurred when the upstream stator wake was convected along the pressure surface of the downstream stator.…”

Section: Guide Vane Rotormentioning

confidence: 99%

Effect of Clocking on Compressor Noise Generation

2018

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The effect of stator clocking on the acoustic noise generation characteristics in an axial high-pressure compressor is analysed. A realistic geometry with one-and-a-half stages is assessed using high fidelity and low-order numerical methods for different clocking positions at approach operating conditions. The compressor efficiency and the acoustic noise emission is found to vary insignificantly between the simulated clocking configurations. Nonetheless, the pressure distribution is altered significantly right upstream of the inlet guide vanes. Although the cut-on modes exhibit at least 10 dB higher amplitudes, the cut-off modes contribute decisively to the wave pattern in the near field. Optimal acoustic liner design can expand on the differently evolving interference pattern of acoustic waves at discrete frequencies. The low-order model is found to predict the directionality of the acoustic waves and the cut-on criteria for the individual modes in excellent agreement with the high fidelity simulations. However, the phase cannot be estimated due to the simplicity of the low-order formulation.

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“…This has been 2 International Journal of Rotating Machinery done to study vane clocking, the circumferential indexing of adjacent vane rows with similar vane counts. Researchers have shown that vane clocking can impact stage loss and efficiency by changing the amount of interaction the upstream vane wakes have with the downstream vane boundary layer [5][6][7][8]. In this research, clocking is used to isolate the flow field effects associated with the downstream vane potential field.…”

Section: Introductionmentioning

confidence: 99%

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

Key

2014

International Journal of Rotating Machinery

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Measurements acquired at the rotor exit plane illuminate the interaction of the rotor with the upstream vane row and the downstream vane row. The relative phase of the upstream and downstream vane rows is adjusted using vane clocking so that the effect of the upstream propagating potential field from the downstream stator can be distinguished from the effects associated with the wakes shed from the upstream stator. Unsteady absolute flow angle information shows that the downstream potential field causes the absolute flow angle to increase in the vicinity of the downstream stator leading edge. The presence of Stator 1 wake is also detected at this measurement plane using unsteady total pressure data. The rotor wakes are measured at different circumferential locations across the vane passage, and the influence of Stator 1 wake on the suction side of the rotor wake is evident. Also, the influence of the downstream stator is detected on the pressure side of the rotor wake for a particular clocking configuration. Understanding the role of the surrounding vane rows on rotor wake development will lead to improved comparison between experimental data and results from computational models.

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An Experimental Study of Vane Clocking Effects on Embedded Compressor Stage Performance

Cited by 10 publications

References 23 publications

Vane Clocking in a Three-Stage Compressor: Frequency Domain Data Analysis

Vane Clocking in a Three-Stage Compressor: Frequency Domain Data Analysis

Effect of Clocking on Compressor Noise Generation

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

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