Open AccessStrength Analysis of a Ducted Axial Fan Blade
Author(s) -
Marek Rośkowicz,
R. Chachurski,
S. Tkaczuk,
Piotr J. Leszczyński,
Maciej Majcher,
Łukasz Omen
Publication year - 2018
Publication title -
problemy mechatroniki
Language(s) - English
Resource type - Journals
eISSN - 2720-5266
pISSN - 2081-5891
DOI - 10.5604/01.3001.0012.7334
Subject(s) - blade (archaeology) , rotor (electric) , mechanical fan , structural engineering , engineering , helicopter rotor , computer simulation , axial compressor , transonic , airflow , airfoil , computational fluid dynamics , aerodynamics , mechanical engineering , aerospace engineering , simulation , gas compressor
This paper presents a numerical strength analysis of a ducted axial fan blade. Ducted axial fans are a large group of fluid-flow machines. The analysis was designed to determine the causes of cyclic failures of a ventilation unit. The paper presents a reverse engineering approach to the mapping of the fan blade’s geometrical features. The geometrical features were mapped by triangulation from the scanning images produced by a 3D optical scanner. These were followed by simplifying assumptions on which the numerical calculations were based. The numerical calculations were carried out at the operating rotational speeds of the ducted axial fan’s rotor. The course of the numerical calculations is described, and their results are also presented herein. The results are represented on colour maps of stress distribution for selected structural elements of the fan blade. The stress distribution at a blade cross-section was compared to CT scans of the fractures of failed rotor blade airfoils. Final conclusions were developed which show that the design engineering process of fans should feature optimisation of the fan’s efficiency, including the strength and performance parameters, which should include the service life of the fan.