STEAM TURBINES THEIR CONSTRUCTION, （蒸汽涡轮机的建设,）.pdf

Proceedings of The South Afvican Sugar Technologists Association-March 1966 STEAM TURBINES -THEIR CONSTRUCTION, SELECTION AND OPERATION By W. B. JACHENS Fig. 2 shows the general view of a rotor mounted on a shaft, Figs. 2a and 2b the side and end elevations. The first steam engine built by James Watt in the V, is the absolute uniform velocity of the fluid enter- year 1769 was the advent in substituting the low ing the rotor passage, while V, is the absolute uniform energy rates produced by wind, water, man and beast velocity leaving the rotor passage. Components of V, for the higher mechanical power produced by a and V, are conveniently considered in 3 directions, machine. A further milestone was in the year 1866 i.e. axial, radial and tangential. when Werner von Siemens invented the principle of producing electricity from a rotating machine, the Torque T = 5 (Vlt .R1 - .R2) .. . ..1 so-called electro-magnetic principle. Coupled to the g steam engine this had the advantage of producing Energy E = T X W = G _ ( V ~ ~ ~ R ~ . W - V ~ ~ . R ~ . W ) power centrally and making it available at a large g number of points. = G_(Vlt * U1 - V2t .U2) 2