Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
644944 | Applied Thermal Engineering | 2016 | 24 Pages |
Abstract
A fast response Chromel-Alumel (K-type) co-axial thermocouple is designed, fabricated, calibrated and tested in a shock tunnel. The freestream Mach number of 5.75 and the total enthalpy of 0.92âMJ/kg are simulated to study the stagnation point heat flux of a hemi-spherical model through transient temperature trace. The realized K-type co-axial thermocouple of 3âmm in length and 1.6âmm in diameter is flush mounted at the stagnation point of a 7.5âmm radius hemi-spherical model. The achieved response time of the realized K-type co-axial thermocouple is ~3âµs, which is sufficient enough to capture the transient temperature signal. A steady tunnel flow time of 1.8 milliseconds is used to get the average stagnation point heat flux. The measured stagnation point heat flux is 22.96 W/cm2, which is well matched with the Fay-Riddell value within 5.5%. The realized K-type co-axial thermocouple is robust, responds fast, and can be contoured to any type of model surface.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
S.L.N. Desikan, K. Suresh, K. Srinivasan, P.G. Raveendran,