| Citation: | JI Nian, MA Chaochen. Design and measurement error estimation of a shielded total temperature probe[J]. Journal of Aerospace Power, 2023, 38（7）：1749-1761 doi: 10.13224/j.cnki.jasp.20210620
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Ignoring the radiation error, the velocity error and heat conduction error of a shielded total temperature probe under different working conditions were predicted by using the conjugate heat transfer numerical simulation method. Results showed that the thermal conductivity error was kept at a small value in the range of Mach number from 0.2 to 0.6; more than 90% of the total error was contributed by velocity error; the maximum measurement error was 1.13 K, which was 331.62%, 119.4%, 61.6% and 59.5% lower than the common structure A, B, C and D, respectively; velocity error and conduction error affected each other, and there was an optimal solution to minimize the total error. It was applicable to the total temperature measurement of isothermal incoming flow and high-speed non-isothermal incoming flow with Mach number greater than 0.5. Finally, the influence of thermocouple junction position on measurement accuracy was discussed. When the junction was kept away from the support from the design point, the measurement error followed the change law of first increasing and then decreasing.
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