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

Research on the Dynamic Calibration of Thermocouple and Temperature Excitation Signal Generation Method Based on Shock-Tube Theory

[+] Author and Article Information
Zhaoxin Yang

Science and Technology on Inertial Laboratory,
Beihang University,
XueYuan Road No. 37,
HaiDian District,
Beijing 100191, China
e-mail: tutu198210@sina.com

Xiaofeng Meng

Science and Technology on Inertial Laboratory,
Beihang University,
XueYuan Road No.37,
HaiDian District,
Beijing 100191, China
e-mail: mengxf@buaa.edu.cn

1Corresponding author.

Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 10, 2014; final manuscript received January 14, 2014; published online February 18, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(7), 071602 (Feb 18, 2014) (10 pages) Paper No: GTP-14-1014; doi: 10.1115/1.4026547 History: Received January 10, 2014; Revised January 14, 2014

This paper introduces the equipment for generating an excitation signal during the process of thermocouple dynamic calibration in air medium, with the objective of dealing with the problems existing extensively in the excitation signal of incapable assessment of the rising time and inaccuracy in the traceability for the step amplitude. Based on the shock-tube theory, the step-temperature excitation signal that is suitable for the dynamic calibration of the thermocouple with appreciable rising time, wide-frequency bandwidth, and traceable step amplitude can be generated by means of the improvement in the structure of the traditional shock tube as well as the compensation of the shock-tube parameters. Through on-site assessment experimentation and dynamic modeling of the thermocouple, the time constant of the thermocouple can be obtained and the dynamic response of the thermocouple can be modified and compensated, the calibration result of which shows that the dynamic calibration method of the thermocouple proposed in this paper can be implemented for different ranges of frequencies and different phases of the temperature sensor with high reliability; moreover, the calibration equipment is miniaturized.

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Fig. 1

The variation of fluid parameters in the shock tube

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Fig. 2

The structure diagram of the high-pressure chamber

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Fig. 3

The structure diagram of the low-pressure chamber

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Fig. 4

The diagrammatic sketch of the thermocouple calibration system structure

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Fig. 5

The low-pressure chamber pressure with throttle nozzle

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Fig. 6

The relationship of Ma-P satisfied the critical pressure ratio condition

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Fig. 7

The physical map of the thermocouple calibration system

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Fig. 8

Ms-T4 basic relationship curve

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Fig. 9

Ms-T4 balance temperature curve

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Fig. 10

The practical statistic and the matched relation curve between P41 and T1

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Fig. 11

The intersection point figure between the Ms-T4 basic relationship curve series and the balance temperature curve series

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Fig. 12

The relation curve between l and Δt

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Fig. 13

The coverage area of curve between l and Δt in accordance with T1

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Fig. 14

The step response of the high-frequency pressure sensor and high-precision platinum resistor

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Fig. 15

The practical movement of the temperature-excitation signal

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Fig. 16

The system-amplitude frequency feature of the calibrated thermocouple

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Fig. 17

The modeling simulation and the practical response curve of the calibrated thermocouple

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Fig. 18

The system-amplitude frequency feature of before and after dynamic compensation and the first-order derivative element

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Fig. 19

The comparison of dynamic response of the thermocouple with and without the dynamic compensation filter




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