Journal of Fundamentals of Renewable Energy and Applications
Open Access

Development and strutural numerical analysis of light shell with frame diffusor

World Congress and Exhibition on Wind & Renewable Energy

July 28-30, 2016 Berlin, Germany

Tomasz Szafranski, Jerzy Malachowski and Krzysztof Damaziak

Military University of Technology, Poland

Scientific Tracks Abstracts: J Fundam Renewable Energy Appl

Abstract :

This paper presents development of a light shell diffuser with a frame intended for a small wind turbine (rated power of 3kW). The concept was created as an attempt to reduce the mass of the diffuser made of glass fibre composites which are the most commonly used materials for such applications nowadays. The geometrical shape of the diffuser, developed at Technical University of Lodz, was based on computed fluid dynamics (CFD) simulations considering turbine efficiency optimization for low wind speed conditions. The authors focused on developing an overall structural design, as well as detailed technical solutions (stiffener struts, connections, material forming issues). Subsequently, static structural finite element analysis was performed in order to assess stiffness and stress distribution. In this case, load conditions include pressure field from the CFD analysis and gravitational forces. The obtained results lead to a conclusion that the designed aluminium shell frame diffuser may be an alternative option for a composite diffuser. Moreover, the developed structure is characterised by lower mass and comparable stiffness to its composite counterpart. It is worth mentioning that, lighter diffusers allow a use of lighter supporting structures, such as towers or guyed masts. This fact may contribute to reducing the overall costs of future small wind turbines and could potentially be very beneficial for the market of privately owned small wind turbines.

Biography :

Tomasz Szafranski received the BEng degree in 2013 and the MSc degree in Mechanical Engineering in 2015 from Military University of Technology, Warsaw, Poland. He is currently a PhD candidate in the Department of Mechanics and Applied Computer Science, Military University of Technology, Warsaw, Poland. His areas of interest are renewable energy in terms of structural design, numerical modelling and simulation.

Email: tomasz.szafranski@wat.edu.pl