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    The effect of geometry variants on the performance of VAWT-rotor with incline-straight blades
    (Aip Publishing, 2021) Abusannuga, Hashem; Ozkaymak, Mehmet
    This study was conducted theoretically with the aim of investigating the effect of the straight blade angle change on the aerodynamic performance of the vertical axis wind rotor (VAWR). The work was done within the blade angle range of 25 degrees -85 degrees with an angular gradient of 20 degrees. A special name has been given to the VAWR concerned in this paper, where it was called Straight Slant Blades (SSBs). The so-called multi-stream tube (MST) model was modified to be suitable for SSBs. MST is an aerodynamic model, which was previously used to work on what is known as Darrieus and H-Darrieus vertical axis wind turbines. A computer program is designed and developed using Microsoft Visual Basic to be consistent with the objectives of this research. As for verifying the effectiveness of this program, its theoretical results were compared with previous laboratory results from other research studies as it proved its effectiveness in achieving satisfactory results commensurate with the objective of this study. This study is applied to four groups of different engineering designs for the SSB rotor, where each group is concerned with one of the geometric variables confined to the rotor height 2H, the rotor radius R, the number of rotor blades N, and the airfoil C. The results obtained are displayed as rotor power coefficient curves as a function of blade tip speed ratio. As it resulted in the ideal range for the angle of the blade between 45 degrees and 65 degrees, according to the rotor in this range, the value of maximum power coefficient Cp-MAX is at its maximum and the range of tip speed ratios is the highest in addition to the diminution of the problem of self-movement.
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    Investigation of Power Coefficient Behaviors of the Parabolic Wind Rotor Due to its Variable Geometry Parameters
    (Int Journal Renewable Energy Research, 2020) Abusannuga, Hashem; Ozkaymak, Mehmet
    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 (lambda(0)). The aerodynamic mathematical mode called multi-streamtube was implemented. To determine the Cp(lambda(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, sigma, (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).
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    Towards Evaluating the Performance of Vertical Axis Wind Turbine Consist of Slant Straight Blades
    (Ieee, 2020) Abusannuga, Hashem; Ozkaymak, Mehmet
    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 Cp-M 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.