Counter-rotor hydraulic unit on the basis of a nozzle jet hydro turbine Oybek Bozarov, Rayimjon Aliyev, Dilshod Kodirov and Eldorjon Begmatov E3S Web Conf., 434 (2023) 01007 Published online: 12 October 2023 DOI: 10.1051/e3sconf/202343401007