Title page for ETD etd-05182011-124709


Type of Document Dissertation
Author Pullins, Clayton Anthony
URN etd-05182011-124709
Title High Temperature Heat Flux Measurement: Sensor Design, Calibration, and Applications
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Diller, Thomas E. Committee Chair
Ekkad, Srinath V. Committee Member
Huxtable, Scott T. Committee Member
Simpson, Roger L. Committee Member
Vick, Brian L. Committee Member
Keywords
  • heat flux sensor
  • gage sensitivity
  • calibration
  • high temperature
Date of Defense 2011-05-03
Availability unrestricted
Abstract
This effort is focused on the design, calibration, and implementation of a high temperature heat flux sensor for thermal systems research and testing. The High Temperature Heat Flux Sensor (HTHFS) was designed to survive in the harsh thermal environments typically encountered in hypersonic flight, combustion and propulsion research, and large-scale fire testing. The sensor is capable of continuous use at temperatures up to 1000 ◦C. Two methods for steady-state calibration of the HTHFS at elevated temperatures have been developed as a result of this research. The first method employs a water-cooled heat flux sensor as a reference standard for the calibration. The second method utilizes a blackbody radiant source and a NIST calibrated optical pyrometer as the calibration standard. The HTHFS calibration results obtained from both methods compare favorably with the theoretical sensitivity versus temperature model.

Implementation of the HTHFS in several types of transient thermal testing scenarios is also demonstrated herein. A new data processing technique is used to interpret the measurements made by the HTHFS. The Hybrid Heat Flux (HHF) method accounts for the heat flow through the sensor and the heat storage in the sensor, and thus renders the HTHFS virtually insensitive to the material on which it is mounted. The calibrated output of the HTHFS versus temperature ensures accuracy in the measurements made by the sensor at high operating temperatures.

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