Analysis of Stresses in Metal Sheathed Thermocouples in High-Temperature, Hypersonic Flows

Powers, Sean W.; Schetz, Joseph A.; Lowe, K. Todd; Kapania, Rakesh K.

doi:10.2514/6.2020-3277

Cited by 1 publication

(6 citation statements)

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“…27 of Ref. [24]). Each gauge was placed at different angled locations around the rod and approximately 1.0 in.…”

Section: Methodsmentioning

confidence: 91%

“…29 of Ref. [24]). Data were then taken at the steady-state value for 30 s. The data for the 30 s interval were then averaged to get a single data point, which was compared to the low-order model.…”

Section: Methodsmentioning

confidence: 91%

“…30 of Ref. [24]. In the two-wire setup, if the resistance of the wires is changing, then the Wheatstone bridge can become unbalanced and skew the results.…”

Section: Methodsmentioning

confidence: 99%

“…28 of Ref. [24]), stainless-steel, heated oil bath circulator and subject to temperatures up to 392°F (200°C) while controlling the temperature to within 0.1°C by constantly circulating silicone 180 throughout the testing period. The experimental rod was first submerged in the oil bath at room temperature so that a baseline could be taken and used as the zero strain point.…”

Section: Methodsmentioning

confidence: 99%

“…The compiled material database used in this paper can be found in the Appendix of Ref. [24]. The material tables can also be found in Refs.…”

mentioning

confidence: 99%

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Analysis of Stresses in Metal Sheathed Thermocouples in High-Temperature Flows

et al. 2021

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Flight and ground test applications for in-flow and near-wall flow temperature sensing demand robust and accurate sensing, making thermocouple sensors attractive. Even for these extremely well-developed sensors, an accurate prediction of stresses within thermocouple sheaths for custom-configured probes remains a topic of great concern for ensuring an adequate lifetime of sensors. In contemporary practice, high-fidelity simulations must be run to prove survivability, albeit at significant time and expense. Given the resources it takes to run high-fidelity simulations, rapid optimization of sensor configurations is often impossible or, at a minimum, impractical. The developments presented in this paper address the need for high-temperature sensor structural predictions that are compatible with rapid design iteration. The derivation and implementation of a new analytical, low-order model to predict stresses within the sheath of a thermocouple are provided. The analytical model is compared to threedimensional elastic finite element method simulations as well as experimental data from a simplified configuration. The low-order model sheath stress predictions, which are critical to probe survival, are in excellent agreement with the numerically simulated results and experimental results with root-mean-squared percentage errors of approximately 1.2 and 2.6%, respectively, thus, validating the model.

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“…27 of Ref. [24]). Each gauge was placed at different angled locations around the rod and approximately 1.0 in.…”

Section: Methodsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 91%

“…30 of Ref. [24]. In the two-wire setup, if the resistance of the wires is changing, then the Wheatstone bridge can become unbalanced and skew the results.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The compiled material database used in this paper can be found in the Appendix of Ref. [24]. The material tables can also be found in Refs.…”

mentioning

confidence: 99%

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