DEVELOPMENT OF TEMPERATURE-SENSING ELEMENTS FOR JET ENGINES
ARMOUR RESEARCH FOUNDATION CHICAGO IL
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The thermoelectric characteristics were determined for the thermcouple MoSi2Pt and ZrB2Pt. Instability of emf output disqualifies these combinations from high temperature application in jet engine control. Chromel-alumel thermocouples were febricated with various shapes of the hot junction. The design was intended to achieve rapid heat transfer from the gas stream to the metal and adequate structural strength of the assembly. Characteristic response times were determined in a hot gas jet with a mass flow rate of 4 lbsecft2. The recorded data represent the interaction of the time sweep on an oscillograph screen with the 63.2 mark of the thermal emf rise. The best response, namely O.75 second, was obtained from a thermocouple with a butt welded hot junction of thin-wall tubular elements 0.065 OD x 0.005 wall. Vibration test data for this construction were not available for inclusion in this report.
- Test Facilities, Equipment and Methods