Romania

Throughout his career, Ba rglazan was interested in the development of hydraulic machinery. He thus particularly added to problems of cavitation, and to the design and construction of hydraulic machinery. High-speed hydraulic machinery is technically limited by the incipient cavitation process. As early as in 1935, Ba rgla zan established relations for the machinery parameter limits, thereby defining the maximum pump speed in the sub-cavitation region. For axial pumps, the maximum suction head is correlated to the pump design elements, as are also governed hydraulic turbines. Ba rgla zan thus proposed a design for the Francis turbine with a relation between the number of runner blades and minimum losses. These observations were summarized in the 1954 paper, in addition to a relation between the cavitation index σ and the turbine design elements. In 1958, Ioan Anton (1924-), later the successor of Ba rgla zan, expanded the previous results to low-speed hydraulic machinery. From then, Ba rgla zan investigated the peculiar phenomenon according to which the cavitation coefficient depends on the blade profile, as previously observed by Georgy Fedorovich Proskura (1876-1958). This problem was solved in principal shortly before passing away in 1960.