Abstract
In the current age of global energy crisis, the production of energy through alternate energy resources has gained a significant attention. Wind as a source of energy is a very attractive due to the fact that fuel is free of cost in this case. This research is about the aerodynamic design of a VAWT blade using the analytical and CFD techniques for a small scale vertical axis wind turbine (VAWT), aiming 1 kW power output which may be use for domestic purposes to power a single room. The blade design parameters and dimensions are taken aiming the required power output and analytical models are developed to evaluate the aerodynamic forces like lift and drag over the surface of the blade. These forces which are very helpful for the evaluation of the structural integrity of the VAWT blade are then found to be in a close agreement with CFD results which are simulated using commercial software, ANSYS 13.0. The static CFD model is developed at a selected pitch angle during a complete 360° where the aerodynamic forces evaluated are comparable with the analytical values at the similar location.
Highlights
vertical axis wind turbine (VAWT) has certain advantage over HAWTs which makes it favorable for installation in urban areas, like it gives a better response to turbulent wind flows when installed on buildings
computation fluid dynamic (CFD) and experimental analyses may help to improve the performance of VAWTs [3], studied the performance of VAWTs by changing design parameters with fixed pitch angle using CFD simulations and wind tunnel experiments
1) Results obtained from CFD analysis are compared with the analytical solution of the same problem, which was done in the earlier research [9], the comparison of results is summarized in table 2
Summary
VAWTs has certain advantage over HAWTs which makes it favorable for installation in urban areas, like it gives a better response to turbulent wind flows when installed on buildings. The angle of rotation (θ) and apparent velocity This complexity of unsteady aerodynamics makes VAWTs very attractive to be analyzed by CFD models [2]. CFD and experimental analyses may help to improve the performance of VAWTs [3], studied the performance of VAWTs by changing design parameters with fixed pitch angle using CFD simulations and wind tunnel experiments. Different prediction tools for complex shaped VAWT performance evaluation were presented like integrating CAD and CFD existing software for solutions. The mathematical models such as double multiple streamtube (DMS) models were discussed All these VAWT solutions that already exist in market are lacking of technology innovation which may be due to the high complex aerodynamic prediction of VAWTs [4]. VAWT’s performance and aerodynamic efficiency was confirmed using CFD analysis by designing a high efficiency 500W composite VAWT blade, applicable in low speed regions of Korea [8]
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