P. Scholz, A. Barklage, B. van Rooijen, A. Seitz, M. Horn, C. Badrya, R. Radespiel

The present paper discusses the setup, data acquisition, some aspects of post-processing and exemplary data from a large-scale wind tunnel entry conducted in the DNW-LLF facility. The goal of the test was to verify the applicability of a novel, tailored skin, single duct (TSSD) suction system design for active laminar flow control. The model is a 1:0.7 scaled vertical tail plane (VTP) with a height of 4.45 m. The most important measurement methods are pressure scanning, mass flow metering and infrared imaging. The measured pressure is combined with CFD-data in a data-fusion process to reconstruct the full 3D pressure on the VTP surface despite the finite number of discrete pressure taps. This data in turn is used to predict the spatially resolved suction velocity distribution on the surface of the suction panel. Both methods, the pressure reconstruction and the suction velocity estimation, encompass a thorough uncertainty estimation and propagation. Also, the total suction mass flow is measured with a custom-designed metering system with a final accuracy of ±0.1% of the reading. The comparison with an integration of the suction velocity gives excellent agreement, raising confidence in all these methods. This process, and the accompanying results of the detection of the transition line with infrared imaging, will be demonstrated for a symmetric flow case under reference conditions. A significant amount of laminar boundary layer flow was retained, demonstrating the general feasibility of the TSSD system.

Deutscher Luft- und Raumfahrtkongress 2022, Dresden

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2022

Conference Paper

englisch

21,0 x 29,7 cm, 11 Seiten

urn:nbn:de:101:1-2022102815450250309471

10.25967/570065

Laminar Flow Control, Wind Tunnel Experiments, Laminar-turbulent Transition

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Scholz, P.; Barklage, A.; et al. (2022): Large-Scale Wind Tunnel Testing of an Advanced Hybrid Laminar Flow Control System. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/570065. urn:nbn:de:101:1-2022102815450250309471.

28.10.2022