DAHL

SWEDEN (see also List of Individuals)

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20.1.1881 Hedemora/S - 15.10.1957 Stockholm/S

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Hjalmar Dahl graduated as a mining engineer from the Uppsala University in 1905. He joined in 1907, after additional education in mathematics and mechanical engineering, the turbine designer Finshyttan in Filipstad. He was appointed in 1914 professor of mining engineering at the Filipstad Mining School and took over in 1922 the Institute of mechanical engineering. Dahl was elected Member of the Swedish Engineering Academy in 1919. He was a Member of the International Association of Hydraulic Research IAHR and participated in its 1955 Congress in La Haye.

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Dahl was a designer and an expert in turbines as used for the production of hydroelectricity. Starting in 1905, when with the turbine furnisher in Finshyttan, he mainly experimented with Francis turbines for an improved hydraulic and mechanical turbine performance. In 1907 Dahl proposed a novel element for turbine regulation which was also elaborated at the hydraulic laboratory. In the same year, he proposed the first Swedish vertical pump arrangement for heating purposes. In the 1910s, Dahl was one of the Swedish experts in developing the Swedish hydropower potential. In the 1920s, he took then interest in the novel developments of the Kaplan turbine and contributed, as did others, to its particular cavitation concerns. The 1927 publication is an addition to the hydraulics of moving hydraulic jumps in canals, as often subjected by a rapid change of the discharge regime downstream from powerhouses of hydroelectric installations. In the 1930s, Dahl contributed to centrifugal pumps, again with detailed laboratory observations. The scaling laws governing turbine flow were presented in 1946 with a notable publication.

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_{Anonymous (1944). Dahl, Hjalmar Olivier. Svenska män och kvinnor 2: 160. Bonniers: Stockholm. P}

_{Dahl, H. (1913). Axialtryck vid Francisturbiner. Teknisk Tidskrift 43(M7): 73-76.}

_{Dahl, H. (1919). Untraverkets turbiner och deras provning. Teknisk Tidskrift 49(M12): 153-159. Dahl, H. (1923). Dahls föreläsnigar nedtecknade av Svante Lindström. KTH: Stockholm. Dahl, H. (1927). Om svallningar i kanaler och tuber. Ingeniörsvetenskapsakademiens 63: 1-18. Stockholm.}

_{Dahl, H. (1933). Största tillåtna sughöjden vid turbiner och centrifugalpumpar. Teknisk Tidskrift}

_{63(M3): 25-29.}

_{Dahl, H. (1946). Modellprov vid vattenturbiner. Teknisk Tidskrift 76: 495-498.}

_{Dahl, H. (1955). On non-permanent flow in open canals. 6 IAHR Congress La Haye D(19): 1-16.}