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Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

A Conceptual Design Study for a New High Temperature Fast Response Cooled Total Pressure Probe

[+] Author and Article Information
Jean-François Brouckaert

Turbomachinery and Propulsion Department, von Kármán Institute for Fluid Dynamics, 72, Chaussée de Waterloo, B-1640 Rhode-Saint-Genèse, Belgiumbrouckaert@vki.ac.be

Mehmet Mersinligil

Turbomachinery and Propulsion Department, von Kármán Institute for Fluid Dynamics, 72, Chaussée de Waterloo, B-1640 Rhode-Saint-Genèse, Belgiummersinli@vki.ac.be

Marco Pau

Turbomachinery and Propulsion Department, von Kármán Institute for Fluid Dynamics, 72, Chaussée de Waterloo, B-1640 Rhode-Saint-Genèse, Belgiumpau@vki.ac.be

J. Eng. Gas Turbines Power 131(2), 021602 (Dec 29, 2008) (12 pages) doi:10.1115/1.2969092 History: Received April 10, 2008; Revised April 10, 2008; Published December 29, 2008

The present paper proposes a concept for a water-cooled high temperature unsteady total pressure probe intended for measurements in the hot sections of industrial gas turbines or aero-engines. This concept is based on the use of a conventional miniature piezoresistive pressure sensor, which is located at the probe tip to achieve a bandwidth of at least 40 kHz. Due to extremely harsh conditions and the intention to immerse the probe continuously into the hot gas stream, the probe and sensor must be heavily cooled. The short term objective of this design is to gain the capability of performing measurements at the temperature conditions typically found at high pressure turbine exit (1100–1400 K) and in the long term at combustor exit (2000 K or higher).

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 16

Evacuated heat as a function of mass flow rate, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 17

Streamtraces in original probe design, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 18

Temperature distribution in original and modified probe designs, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 19

Streamtraces in modified probe design, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 20

Temperature distribution in modified probe design, Inconel 600 (left), copper (right), Tg=1400 K, Ma=0.5, and Po=40 bars

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Figure 21

Nusselt number distributions around a circular cylinder for various Reynolds numbers (Ref. 38)

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Figure 1

Fast response cooled total pressure probe concept

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Figure 2

Sensor head and screen cooling configuration

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Figure 3

Comparison of heat flux evolution as a function of gas temperature using different Nusselt number correlations, Po=40 bars, Ma=0.5, and Tu=0.15

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Figure 4

Comparison of theoretical transfer functions for different cavity lengths for the frequency response of screen-cavity configuration

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Figure 5

Experimental transfer function from shock tube tests for the frequency response of screen-cavity configuration

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Figure 6

Schematic representation of the 1D model theory

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Figure 7

Schematic representation of the heat flow through the probe

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Figure 10

2D axisymmetric model of the sensor region, temperature contour plot, and stream traces, Tg=1400 K, Ma=0.5, Po=1 bar, hg=2600 W/m2 K, and water flow rate=2 l/min

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Figure 8

Effect of probe material on probe outer wall temperature and heat to be extracted as a function of gas temperature

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Figure 9

Effect of immersion depth, thermal barrier coating, core engine casing temperature on the probe outer wall temperature, and heat to be extracted as a function of gas temperature (Po=40 bars, Ma=0.5, and Tu=0.15)

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Figure 11

Design modifications on the screen and the sensor cooling channel

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Figure 12

Temperature distribution inside the probe walls, water inlet from the annular jacket (left), and water inlet from the inner tube (right), Tg=1400 K, Ma=0.5, Po=1 bar, hg=2600 W/m2 K, and water flow rate=2 l/min

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Figure 13

Probe surface temperature as a function of mass flow rate, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 14

Water temperature approaching the sensor as a function of mass flow rate, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 15

Water outlet temperature as a function of mass flow rate, Tg=1400 K, Ma=0.5, and Po=1 bar

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Figure 22

von Mises stresses and safety factor as a function of immersion depth, Tg=1400 K, Ma=0.5, and Po=1 bar

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