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    Investigation of power coefficient behaviors of the parabolic wind rotor due to its variable geometry parameters
    (International Journal of Renewable Energy Research, 2020) Abusannuga, H.; Özkaymak, M.
    This paper provides explanations and analysis of how the power coefficient (Cp) of the Parabolic wind rotor has been affected by changing its geometrical design parameters. The results were presented in the form of (Cp) curves as a function of tip speed ratio (?0). The aerodynamic mathematical mode called "multi-streamtube" was implemented. To determine the Cp(?0) of the Parabolic rotor, regardless of its engineering shape, a computer program has been prepared by using Microsoft Visual Basic. The geometrical design parameters covered in this study are rotor blades number (N), rotor height (h) or (2H), rotor diameter (2R) and chord line (C). Whereas, through these parameters a total of 57 configurations were utilized and adopted. Thus, this number of different designs was sufficient to identify the performance behaviors of the Parabolic wind rotor. Accordingly, the results indicated that increasing rotor height to diameter ratio (H/R) leads to a decrease in Cp over low tip speed ratio range for all values of solidity, ?, (NC/R) investigated. However, higher values of (H/R) result in a raise in Cp over high tip speed ratio range for values of (NC/R) less than 0.2 approximately. Thus, it seems that higher (H/R) values constitute an advantage for fast rotating rotors (low (NC/R) and high tip speed ratio). © 2020, International Journal of Renewable Energy Research.
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    Towards Evaluating the Performance of Vertical Axis Wind Turbine Consist of Slant Straight Blades
    (Institute of Electrical and Electronics Engineers Inc., 2020) Abusannuga, H.; Ozkaymak, M.
    In this theoretical study, the effect of variable blade inclination angle or angle of blade slant on power factor Cp of straight blades- vertical axis wind turbine has been studied. Where a slop of angle on the horizontal plane was changed from an angle of 25 degrees to an angle of 85 degrees with the amount of change is equal to 20 degrees. Within the scope of this research, the wind rotor was given the name 'straight-slant vertical axis wind turbine' (SS-VAWT). The mathematical model 'Multi Stream Tube' was applied in the form of a computer program by using 'Microsoft Visual Basic', with regard to checking the effectiveness of this program, it was done by comparing its theoretical results with previous laboratory results from another researches, as it proved its effectiveness in achieving satisfactory results that fit the aim of this study. This study was conducted on twelve configurations of SS-VAWT, which were divided into four groups which are (H group), (R group), (N group) and (C Group) to study the effect of blade inclination angle at different values of rotor height (H), rotor radius (R), rotor blades number (N) and blade airfoil length (C) respectively and separately. The results are expressed by power curves as a function of tip speed ratio. As the results indicated that angle of blade slant range from 45 degrees to 65 degrees is the best range for rotor blade inclination in terms of obtaining the highest power factor CpM in addition to the largest range of tip speed ratio and moreover the angle 45 degree has the advantage of limiting the problem of starting a self-motion. © 2020 IEEE.
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    Whether the Darrieus Rotor with Straight-Blades or Curved-blades is the Best, in Terms of Aerodynamic Efficiency
    (Institute of Physics, 2022) Abusannuga, H.; Özkaymak, M.
    An essential part of any wind turbine system is the rotor because it is the component that is in direct contact with wind and converts its kinetic energy into mechanical power. Then, it can either use this mechanical power directly to run some machinery, or you can use it to run an electricity generator and get electricity. One such turbine which is ideal for small-scale applications is the Darrieus wind turbine. This turbine has two blade configurations, straight or curved. This study aims to figure out the influences of these two blade configurations on the aerodynamic performance of the wind turbine. The engineering geometric shape of a parabolic Darrieus rotor was selected with certain dimensions, in this study it called P-D, and then a straight blade Darrieus rotor was extracted from it, in this study it called S-D1, similar to that of a parabolic in terms of rotor diameter and rotor height values, number of blades, blade section length and its type. Thus, a geometric similarity was obtained between the two rotors in terms of height to diameter ratio value and solidity value. Another rotor called S-D2 was also extracted and it is similar to P-D in terms of blade length, which means that the parabolic blade is straightened. There is also a similarity in solidity, and therefore it can be said that the masses of the rotors P-D and S-D2 are equal. This is the methodology that was followed to make the comparison in terms of aerodynamic. This analysis is done by developing a computer program that is based on mathematical model called multi-stream tube which modified to apply on both configurations of Darrieus turbine. The straight-bladed configuration is the best, according to this study. © Published under licence by IOP Publishing Ltd.