Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

0556228 - ÚT 2023 RIV CH eng J - Článek v odborném periodiku
Yanovych, Vitalii - Duda, D. - Uruba, Václav - Tomášková, T.
Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities.
Processes. Roč. 10, č. 3 (2022), č. článku 522. E-ISSN 2227-9717
Institucionální podpora: RVO:61388998
Klíčová slova: asymmetric airfoil * hot-wire * shape inaccuracies * the structure of turbulent * wake topology * aerodynamic characteristics
Obor OECD: Applied mechanics
Impakt faktor: 3.5, rok: 2022
Způsob publikování: Open access
https://mdpi-res.com/d_attachment/processes/processes-10-00522/article_deploy/processes-10-00522-v3.pdf?version=1646878698

The scope of this paper is to perform a detailed experimental investigation of the shape error effect on the turbulence evolution behind NACA 64-618 airfoil. This airfoil is 3D-printed with predefined typical shape inaccuracies. A high-precision optical 3D scanner was used to assess the shape and surface quality of the manufactured models. The turbulent flow was studied using hot-wire anemometry. The developed force balance device was provided to measure the aerodynamic characteristics of the airfoil. Experimental studies were carried out for three angles of attack, +10°, 0°, −10°, and different chord-based Reynolds numbers from 5.3 × 104 to 2.1 × 105. The obtained results show that the blunt trailing edge and rough surface decline the aerodynamic performance of the blades. In addition, the experimental results revealed a strong sensitivity of the Taylor microscale Reynolds number to the type of shape inaccuracy, especially at Re ≈ 1.7 × 105. We also discuss the evolution of the Reynolds stress components, the degree of flow anisotropy, and the power spectrum distributions depending on the airfoil inaccuracies. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Trvalý link: http://hdl.handle.net/11104/0332307