Performance of Heron turbine with various nozzles and blockage effects Esmail Lakzian, Vahid Sadrian, Shima Yazdani and Heuy Dong Kim Eur. Phys. J. Plus, 139 8 (2024) 718 Published online: 10 August 2024 DOI: 10.1140/epjp/s13360-024-05479-3