In this project, we take interest in the wind concentrator, in particularly its form for private use.
Wind is one of the most ancient source of renewable energy used by humans. Its key utility is to produce energy thanks to a turbine linked to a generator.
Although numerous researches has been done, the energy efficiency, especially for private users, has not reach a satisfying level in order to implant them.
Our objective is to install our wind turbines on households and private buildings in low altitude. This implies a wind turbine which can work under low-speed wind. For our research, we experience our product in a case of turbulent wind, which is usually the case in cities and peripherals where the wind flow is not stable.
To realize our modellings, we operate with a software interface of simulation: COMSOL Multiphysics. It is a numerical platform for modelling and simulating purposes but also solver and analysis in physics phenomenon based on numerical methods previously installed by the program. For its parameters, we use the integrated model k-epsilon (k-?). In addition, the necessary mathematical equations for the software is done on Matlab. It is programming language emulator to develop an environment to solve numerical calculations. This software allows the manipulation of matrixes, drawing curves based on data, writing algorithm and create user interface.
First, we realize a nozzle geometry based on a mathematical equation. This allows to determine the curve and form of the nozzle. Next this sample allows us to identify the good and bad of our initial attempt and to carry out others simulations.
From these tests, we can point out three different major selection criteria to determine the optimal geometry: un factor between the speed inlet and the speed outlet, homogeneity of the speed in the center zone of the nozzle and a compatibility between the result and the convenient size of the installation which must not exceed certain limit in order not to disturb the visual landscape.
Thanks to our modellings in COMSOL, we can highlight an optimal form of the nozzle allowing to obtain a high speed at the center. This corresponds to the wind speed arriving at the wings, reaching a sufficient speed so that private wind turbines can function during its entire life cycle and most importantly more power efficiency.