Development of New Single and High-Density Heat-Flux Gauges for Unsteady Heat Transfer Measurements for a Rotating Transonic Turbine

Celestina, Richard; Sperling, Spencer; Christensen, Louis; Mathison, Ronald; Aksoy, Hakan; Liu, Jong

doi:10.1115/gt2020-14527

Cited by 1 publication

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“…After establishing the end application criteria and material choices, several design parameters are also required: (a) substrate thickness, (b) coating thickness, (c) RTD shape, and (d) RTD material. In practice, the RTD material is constrained by the electro-thermal properties of known materials and is usually nickel [10,16] or platinum (used for current study) [11,17,18]. Moreover, the shape of the RTD for the application of HFGs is constrained in this study by the pursuit of in-situ calibration techniques [19], which requires a rectangular shape with large length-to-width ratios (L/2b = 10 for current study).…”

Section: Gauge Designmentioning

confidence: 99%

Development of coated heat flux gauges for fast responding measurements

Siroka¹,

Berdanier²,

Thole³

2022

Meas. Sci. Technol.

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Thermal systems often exhibit transient behaviors that have important implications for the operation of the system and can be difficult to predict. For these reasons, experimental testing is often required to ensure system durability requirements are achieved. One important parameter governing the survivability of components in hot, high-stress environments is the heat flux into the part that dictates the temperature distribution for the component. However, sensors required to experimentally characterize heat fluxes in extreme environments must also be resilient. This study presents the development of coated heat transfer gauges capable of robust, high-frequency measurements in turbine research facilities. The addition of a protective coating increases the durability of the gauge, but inherent of that coating is the attenuation of high-frequency temperature penetrations. As a result, this study first outlines the use of analytical solutions to define a gauge design for a specific frequency range and heat transfer, ensuring that subsurface signals can be rectified to surface conditions through inverse methods. Then, the fabrication of polyimide substrate sensors with a parylene-F coating is described. Micro surface heaters added to the custom sensors were used to determine important geometric and thermal properties necessary to calculate accurate surface heat flux. Ultimately, this work shows increased sensor robustness in a turbine test bed and experimentally validates that the frequency response of the fabricated sensors meet the design intent.

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