Fast-Response transient heat flux measurements in a plasma wind tunnel
Article
Article Title | Fast-Response transient heat flux measurements in a plasma wind tunnel |
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ERA Journal ID | 3756 |
Article Category | Article |
Authors | Birch, Byrenn (Author), Buttsworth, David (Author), Loehle, Stefan (Author) and Hufgard, Fabian (Author) |
Journal Title | International Journal of Heat and Mass Transfer |
Journal Citation | 173 |
Article Number | 121234 |
Number of Pages | 9 |
Year | 2021 |
Publisher | Elsevier |
ISSN | 0017-9310 |
1879-2189 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ijheatmasstransfer.2021.121234 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0017931021003379 |
Abstract | A fast response heat transfer gauge has been developed to measure the radial distribution and the fluctuations of heat flux in a supersonic arcjet plasma wind tunnel. The heat flux gauge consists of 3.2 mm diameter coaxial surface junction thermocouple which was positioned behind a thin layer of PTFE and mounted in a ESA standard 50 mm diameter flat faced copper probe head. A non-dimensional impulse response for the heat flux gauge was identified using pulsed optical power deposition from a laser. The impulse response was used in combination with reference measurements from a calorimeter at a single location to determine the distribution and fluctuations in heat flux. Eight traverses of the PWK4 jet at the University of Stuttgart confirmed a symmetric Gaussian-like heat flux distribution with a centreline heat flux consistent to within ±6%. These distributions were measured in less than one second, representing a significant gain in productivity when compared to calorimeter-based heat flux measurements where probes must be held stationary at a number of locations in order to resolve spatial distributions. At this particular PWK4 operating condition, which had a flow stagnation enthalpy of approximately 15 MJkg−1, heat flux fluctuations of up to ± 140 kWm-2 (corresponding to a relative variation of 15% of the centreline heat flux) were identified near the vicinity of the nozzle centreline for frequencies from 4 Hz to 1 kHz. |
Keywords | Plasma wind tunnel, Laser calibration, Heat flux, System identification |
ANZSRC Field of Research 2020 | 400106. Hypersonic propulsion and hypersonic aerothermodynamics |
401205. Experimental methods in fluid flow, heat and mass transfer | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions |
Byline Affiliations | School of Mechanical and Electrical Engineering |
University of Stuttgart, Germany | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q64v1/fast-response-transient-heat-flux-measurements-in-a-plasma-wind-tunnel
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