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Research Papers: Gas Turbines: Oil and Gas Applications

Effects Due to the Temperature Measurement Section on the Performance Estimation of a Centrifugal Compressor Stage

[+] Author and Article Information
Alessandro Bianchini, Giovanni Ferrara, Valeria Ballarini, Libero Tapinassi, Lorenzo Toni

Sergio Stecco Department of Energy Engineering,  University of Florence, 50139 Florence, Italy GE Oil & Gas, 50127 Florence, Italy

Lorenzo Ferrari1

Sergio Stecco Department of Energy Engineering,  University of Florence, 50139 Florence, Italyferrari@vega.de.unifi.it GE Oil & Gas, 50127 Florence, Italyferrari@vega.de.unifi.it

Lorenzo Bianchi

Sergio Stecco Department of Energy Engineering,  University of Florence, 50139 Florence, Italylorenzo.bianchi@ge.com GE Oil & Gas, 50127 Florence, Italylorenzo.bianchi@ge.com

1

Corresponding author.

J. Eng. Gas Turbines Power 134(3), 032402 (Jan 09, 2012) (8 pages) doi:10.1115/1.4004722 History: Received May 11, 2011; Revised May 19, 2011; Published January 09, 2012; Online January 09, 2012

A wide-ranging analysis was performed by GE Oil & Gas and the University of Florence to investigate the effects on the estimation of centrifugal compressor performance induced by a different choice of the total temperature measurement section. With this goal in mind, the study focused on the analysis of a commonly found discrepancy between the measurements at the impeller outlet section and at the stage exit section. Based on the experimental data collected on a centrifugal impeller, three main physical phenomena were analyzed and discussed in further detail. First, the effect of the heat exchange was examined, and its influence on the total temperature variation throughout the machine was extrapolated. Next, the influence of the heat-exchange phenomena affecting the temperature sensors was evaluated by means of numerical models and physical assumptions. Finally, the effects on the temperature measurement of the flow structure at the impeller outlet were investigated. In particular, a corrective model to account for the thermal inertia of the thermocouples normally applied in this section was applied to the experimental data. The corrected temperatures at the investigated measurement sections were then compared, and their influence on the correct stage performance estimation is discussed in this study.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Polytrophic efficiency variations due to different choices in the evaluation of the outlet temperature

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Figure 2

Schematic cross section of the tested stage

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Figure 3

Positioning of thermal resistors and thermocouples

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Figure 4

Temperature differences with T60 for different heat fluxes from the resistors - flow-path sections

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Figure 5

Temperature differences with T60 for different heat fluxes from the resistors - thermocouples

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Figure 6

Conductive and kinetic errors at section 20

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Figure 7

Conductive and kinetic errors at section 60

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Figure 8

Corrected temperatures due to the kinetic and conductive errors

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Figure 9

Hypothetical temperature measurement of a thermocouple in a pulsating flow

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Figure 10

ξ* map at the design point

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Figure 11

Calculated ɛ ratios

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Figure 12

Comparison of temperatures after correction to account for the jet-and-wake structure of the flow

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