| Citation: | LUO Kai, WANG Qiu, LI Jiwei, et al. Influence of sensor installation on accuracy of aerodynamic heating measurement on flat plate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(9): 1790-1798. doi: 10.13700/j.bh.1001-5965.2020.0315(in Chinese)
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Accurate measurement of aerodynamic heating is an important issue for hypersonic vehicles to choose reasonable heat resistant materials and thermal structure design. However, it is still difficult to measure the heat flux accurately in shock tunnel experiments, and any slight deviation from ideal conditions may lead to inaccuracy. In-depth investigations are needed to carry out. In this study, the flat plate model is selected to study the influence of the non-ideal sensor installation on the accuracy of heat flux measurement. The sensors examined are protruding or recessed from the model surface in the order of 0.1 mm to 0.5 mm and different Reynolds numbers are considered. Related rules and mechanism of the influence of sensor installation on the accuracy of aerodynamic heating measurement are analyzed in detail. The results show that the sensor installation has great influence on the accuracy of the heat flux measurement. Protruding sensor installation results in larger deviation from actual heat transfer and recessed sensor installation results in smaller deviation compared to the results obtained with a smoothly installed sensor. The larger the protruding/recessed depth, the more severe the deviation, and this deviation will be larger under higher Reynolds number conditions. Using the non-dimensional form of protruding/recessed depth to the thickness of boundary layer, the level of deviation is only related to the non-dimensional value regardless of Reynolds number. In all, the results can provide theoretical guidance for the design and error analysis of aerodynamic heating measurement experiments.
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