Abstract
Variable and mean time constant compensation techniques applied to thermocouples are used to obtain measurements of the temperature moments, axial heat flux, time series, probability density functions, and power spectra in a heated axisymmetric jet. These results are compared to the corresponding results obtained using a cold wire which has adequate intrinsic uncompensated frequency response to measure the time resolved temperature. Comparison of corresponding results indicates that at high mean velocities and moderate velocity intensities (∼10%), both compensation techniques lead to results that are similar to those obtained using the reference cold wire system. At lower mean velocities and higher velocity intensities (∼20%) the variable time constant technique yields results that are in better agreement with those obtained using the reference system.
Sponsored by NSF Grant CPE 8412073
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© 1989 Kluwer Academic Publishers
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Hopkins, K.C., Larue, J.C., Samuelsen, G.S. (1989). Effect of Mean and Variable Time Constant on Compensated Thermocouple Measurements. In: Durão, D.F.G., Whitelaw, J.H., Witze, P.O. (eds) Instrumentation for Combustion and Flow in Engines. NATO ASI Series, vol 154. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2241-9_3
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DOI: https://doi.org/10.1007/978-94-009-2241-9_3
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