StatusThe thesis was presented on the 12 March, 2010
Approved by NCAA on the 29 April, 2010
Abstract– 7.47 Mb / in romanian
Contributions to elaboration and research of helical wind rotor” presented by Ciuperc Rodion in order to be conferred the title of PhD in technical science, Chiinu, 2010. Thesis contains an introduction, five chapters, general conclusions, 205 bibliographical titles, appendixes, 162 pages of basic text, including 134 figures and 15 tables. Results have been published in 26 scientific papers, including 7 papers as sole author, 8 papers in referenced journals and 6 invention patents. Keywords: wind energy system, wind turbine; VAWT and HAWT (vertical axis and horizontal axis wind turbine); Darrieus rotor; Savonius rotor; REEV (vertical axis helical wind rotor); REEV–C (vertical axis helical wind rotor in combined version); CFD (computational fluid dynamics); ANSYS CFX; LabVIEW; permanent magnets generator. Area of study refers to the conversion of wind energy, specifically small–scale VAWT. Thesis goals: elaboration of the small scale wind rotor for VAWT with increased efficiency of the wind energy conversion in order to assure energy needs of individual consumers. Objectives: elaboration of the conceptual design of the wind rotor, that will ensure an increased conversion coefficient of the winds common to the wind atlas of Republic of Moldova; elaboration of the mathematical model and optimization of the geometrical and kinematical parameters of the wind rotor using numerical methods; manufacturing of the experimental prototype and testing installation; elaboration of the testing methodology and experimental analysis of the prototype in order to identify the characteristics of the technical level.
Scientific novelty and originality resides in the elaboration of: concept of combined wind rotor with the helical blades element, protected by 2 invention patents; mathematical model of the proposed wind rotor; numerical analysis (finite element method) in order to optimize the wind rotor using ANSYS CFX software; industrial manufacturing technology of the helical blades with aerodynamic profiles of REEV–C from composite materials; experimental research methodology of the functional parameters of wind turbine on the ground. Scientific significance of the thesis consists in elaboration of the mathematical model of REEV, based on which there was realized a computational program necessary for the design stage of a VAWT in order to optimize and to estimate conversion potential. In the thesis there was considered the theoretical research in the framework of CFD of the airflow – helical rotor interaction and the airflow streamlines have been obtained, the analysis of latter allowed the constructive optimization of REEV. Applied value of the thesis resides in the design and manufacturing of the experimental prototype of REEV–C based on which the industrial version of wind turbine with REEV will be manufactured. An industrial manufacturing technology for the helical blades with aerodynamic profiles from composite materials has been proposed for both Darrieus and Savonius rotors. In order to establish the functional parameters of REEV working in natural conditions, a detailed methodology for performing experimental testing using the modern equipment for data acquisition and processing in LabVIEW framework has been proposed. Thus, a validation of the elaborated mathematical model was achieved. In the same time, the industrial molding forms for manufacturing in series the helical blades have been realized. The proposed wind rotor for VAWT is ready to be integrated in various wind conversion schemes, answering thus the needs of consumers from Republic of Moldova.