Comparative Numerical Analysis on Vertical Wind Turbine Rotor Pattern of Bach and Benesh Type

Abstract

In this work, 3D models in classic configuration of Bach and Benesh rotor type, as well as models with modified blade pattern geometry were analyzed from the air circulation point of view inside the rotor enclosure in order to identify the operating parameters differences according to rotor geometric modified configuration. Constructive design aspects are presented, as well as results obtained from the virtual model analysis in terms of circulation velocity and pressure values which enhance rotor operation related to torque and power coefficients. The rotors design pattern is made according to previous results obtained by different researchers who have performed numerical analysis on virtual models and tests on the experimental rotor models using the wind tunnel. The constructive solutions are describing two-bladed rotor models, in four new designed constructive variants and analyzed using ANSYS CFX. The air velocity specific values, static and total pressure recorded at the rotor blade level are highlighted, that influence the obtaining of rotor shaft torque and power. Also torque coefficient (CT) and power coefficient (CP) values according with specific values of tip speed ratio (TSR) are presented for each analyzed case. The analysis results show higher power coefficient values for analyzed Bach V2 and Benesh V2 rotor modified models compared to the classic Bach and Benesh models for 0.3 TSR of 0.11–012 CP, 0.4 TSR of 0.18 CP (Benesh V2 model) and 0.27 CP at 0.6 TSR (Bach V2). The resulted values confirm that Benesh V2 model offers higher CP up to 5% at TSR 0.3, 2% at TSR 0.6 and 3% at TSR 0.4 compared to the Benesh classical model. The Bach V2 model offers 4% higher CP compared to the classic Bach model at TSR 0.6. Based on these results it is intended the further analytical and experimental research in order to obtain optimal rotor pattern.

Review of Specific Performance Parameters of Vertical Wind Turbine Rotors Based on the SAVONIUS Type

“…There are many blade types with different section shapes placed at a different distance from the rotor central axis, known as the blade gap. Figure 2 presents the principal design parameters for the SAVONIUS rotor model [61][62][63][64][65]. Table 1 presents the main constructive parameters with direct influence on the SAVO-NIUS vertical-axis rotor operation.…”

“…Table 2 presents these functional parameters characteristic of any type of turbine rotor with a vertical-axis as well as the characteristic relation for each parameter [61][62][63][64][65].…”

“…The power coefficient as it is presented by Ragheb M et al is defined as the ratio between the amount of power converted by the wind turbine rotor (P t ) relative to the available power within the air stream (P a ) [61][62][63][64][65].…”

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“…2015;Benesh. 1988), and (Scheaua, 2020) Fig- 1(c). In the same perspective, Bach model has been developed by ( Roy & Saha.…”

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“…Also, because these properties depend on the viscosity of nanoparticles in the base fluid, the nanofluid properties can be adjusted by changing the viscosity of nanoparticles. The structure and principles of multi-objective optimization methods are the same as single-objective optimization methods, but in a way the number of variables and objective functions in these methods is increased and they are used to find an optimal answer collection [1,2]. Hemmat et al Optimized the nanofluid multi-objective with the aim of reducing costs and increasing the heat transfer coefficient [3] Sonawane et al Optimized nanoscale to increase thermal conductivity and reduce viscosity in heat exchangers [4].…”