Abstract
One of the main issues related to the design and development of small wind turbines (SWTs) is the low Reynolds number. Operation in the transitory regime makes the rotor aerodynamic analysis a challenging task. Project GUST (Generative Urban Small Turbine) realized currently at the Institute of Turbomachinery (Lodz University of Technology, Poland) is devoted to the development of SWT (D= 1.6 m) for low-Reynolds number (low wind speed) flow conditions. The emphasis is on the blade design, aiming at improving the rotor aerodynamic efficiency. The paper will highlight the rotor design process, based on contemporary methods of experiment-simulation integration approach and use of rapid manufacturing techniques. In-house wind tunnel measurements of a scaled model performance were executed. A numerical analysis using dedicated software (QBlade) was conducted in parallel. A comparison between the obtained results indicated that the chosen numerical tools are capable of providing a reliable output, even in complex, transitional flow conditions. Bearing in mind the above observations, QBlade was incorporated into the development process of a completely new blade geometry which would increase rotor performance. The selected design has indeed prove to show better power outcome in an additional experimental campaign.
Highlights
Nowadays, the objective of fulfilling the world energy requirements and at the same time of taking into account global climate changes is a challenging task
The dispersed and decentralized small scale wind turbines show a significant potential for power production
Two factors are of concern: initial cost per kW power and the unit cost per kWh it produces [2]
Summary
The objective of fulfilling the world energy requirements and at the same time of taking into account global climate changes is a challenging task. As an omnipresent and renewable source, is a promising solution, its utilization in large scale wind turbines, frequently organized into big wind farms, can negatively affect both climate and atmosphere [1]. The dispersed and decentralized small scale wind turbines show a significant potential for power production. It can be sufficient for urban applications or domestic needs without influencing the weather and environment conditions [2]. On the contrary, when placed and sized correctly and operating at design conditions, small wind turbines can be considered as a convenient, effective and environment-friendly power supply. Two factors are of concern: initial cost per kW power and the unit cost per kWh it produces [2]
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