Danieal Aderson Sinaga, Muhamad Dwi Septiyanto, Zainal Arifin, Gunawan Rusdiyanto, Singgih Dwi Prasetyo and Syamsul Hadi 2023. The Effect of Blade Distances on the Performance of Double-Stage Gravitational Water Vortex Turbine. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 109, 1 (Oct. 2023), 196–209. DOI:https://doi.org/10.37934/arfmts.109.1.196209.