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

Comparison of Piston Temperature Measurement Methods: Templugs Versus Wireless Telemetry With Thermocouples

[+] Author and Article Information
Daniel P. Madison

e-mail: dpmadiso@mtu.edu

Scott A. Miers

e-mail: samiers@mtu.edu
Michigan Technological University,
Houghton, MI 49931

Glen. L Barna

IR Telemetrics,
Hancock, MI 49930 
e-mail: irtel@irtelemetrics.com

Jay L. Richerson

Caterpillar Inc.,
Peoria, IL 61656 
e-mail: Richerson_Jay@cat.com

1Corresponding author.

Contributed by the Power Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 18, 2012; final manuscript received January 18, 2013; published online May 22, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(6), 061602 (May 22, 2013) (8 pages) Paper No: GTP-12-1487; doi: 10.1115/1.4023493 History: Received December 18, 2012; Revised January 18, 2013

The objective of this investigation was to compare the results of metallurgical temperature sensors and thermocouples when used to measure piston temperatures in a running engine. Type J thermocouples and a microwave wireless telemetry system were used to gather real time temperature data on the piston in the vicinity of each metallurgical sensor. Eight pairs of metallurgical temperature sensors were installed in the piston with a thermocouple junction in-between. The engine was ramped up to steady state quickly and then held for approximately 4 h at 1800 rpm and 1980 Nm before being quickly ramped back down in accordance with the metallurgical sensors' recommended test cycle. During the test, continuous temperature data at each of the sensor locations were monitored and recorded using the telemetry system. After the test was complete, the metallurgical temperature sensors were removed and independently analyzed. The results indicate that readings from the metallurgical temperature sensors were similar to those of the embedded thermocouples for locations without large thermal gradients. However, when thermal gradients were present, the metallurgical sensor's reading was influenced measurably.

Copyright © 2013 by ASME
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Fig. 1

Sample Templug calibration curve [2]

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Fig. 2

No. 2 steel M3 Templug drawing [2]

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Fig. 3

Ideal Templug test cycle [2]

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Fig. 4

Acceptable Templug test cycles [2]

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Fig. 5

Wireless telemetry component schematic [3]

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Fig. 6

Microwave wireless telemetry conversion process [5]

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Fig. 7

Piston telemetry installation [5]

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Fig. 8

Temperature calibration schematic [5]

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Fig. 9

Sample microwave wireless telemetry calibration curve [5]

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Fig. 10

Initial and post-test calibration error analysis [5]

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Fig. 11

Sample installation at the piston bowl area. Dimensions in mm.

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Fig. 12

Magnified impage of piston bowl installation

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Fig. 13

Sample installation at the wrist pin boss area. Dimensions in mm.

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Fig. 14

Top view of piston measurement locations

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Fig. 15

Plot of temperature versus time for one piston bowl location over the test cycle

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Fig. 16

Comparison of results for piston bowl locations

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Fig. 17

Comparison of results for wrist pin boss locations

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Fig. 18

Diagram of piston oil cooling jet location and intake/exhaust valve orientation [8]

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Fig. 19

Thermal resistance network model of Templug installation




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