Wind tunnel testing and numerical simulation on aerodynamic performance of a three-bladed Savonius wind turbine

Abstract

Reversible solid oxide cells can provide efficient and cost-effective scheme for electrical-energy storage applications. However, this technology faces many challenges from material development to system-level operational parameters , which should be tackle for practical purposes. Accordingly, this study focuses on developing novel robust artificial intelligence-based blackbox models to optimize operational variables of the system. A genetic-programming algorithm is used for Pareto modeling of reversible solid oxide cells in a multi-objective fashion based on experimental input-output data. The robustness of the obtained optimal model evaluated using Monte Carlo simulations technique. An optimization study adopted to optimize the operating parameters, such as temperature and fuel composition using a differential evolution algorithm. The objective functions that have been considered for Pareto multi-objective modeling process are training error and model complexity. In addition, the discrepancy between maximum and minimum output voltage in the whole operation of the system is chosen as the optimization process objective function. The robustness of the optimal trade-off model is shown in terms of statistical indices for varied uncertainty levels from 1 to 10%. The optimized operational condition based on the suggested model reveals optimal intermediate temperature of 762 °C and fuel mixture of about 29% H 2 , 25% H 2 O, and 14% CO.

Development of efficient vertical axis wind turbine clustered farms

“…The torque coefficient (C m ) is calculated by Eq. (6) at each time step and averaged after periodic convergence [16], then the power coefficient (C p ) is calculated from Eq. (7):…”

“…Fluent code is used to solve the unsteady Reynolds averaged Navier-Stokes equations using finite volume method [14][15][16][17]. The geometry features of the Savonius wind turbine used in the simulation is shown in Table 1.…”

Numerical investigation of the aerodynamic performance for the newly designed cavity vane type vertical axis wind turbine

“…Morshed et al [11] carried out feasibility studies on conventional and modified vertical-axis Savonius wind turbine feasibility improved by, first performed a series of wind tunnel investigations on semicylindrical three-bladed Savonius scale models with different overlap ratios and also without overlap at different Reynolds numbers. They also performed computational fluid dynamics (CFD) simulations using GAMBIT and FLUENT software's to analyze the static rotor aerodynamics of those models.…”

Computational model of Savonius turbine

“…Several studies compared different computational and experimental rotor geometries [14][15][16][17], evaluating the performance from power coefficient (Cp) standpoint and torque coefficient's (Cm); recent studies [18]- [20] compare conventional and modified Savonius wind turbine and evaluate the flow patron structure.…”