The flow at the exit from the runner blade of a centrifugal fan with forward curved blades (a sirocco fan) sometimes separates and becomes unstable.
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We consider the complex problem of numerically simulating a flow in the fluid passage of a hydraulic turbine that consists of a spiral casing, a cascade of stay vanes and guide apparatus vanes, a runner, and a draft tube.
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Double gates mold induce higher temperature due to longer runner length.
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One must remember that the first marathon runner, Phidippides, collapsed and died at the finish of his race.
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Osteoporosis in a female cross-country runner with femoral neck stress fracture
The relations between the pressure fluctuation and velocity distribution in the draft tube of a Francis turbine and the unit speed n', and the unit discharge Q'1 as well as that between the relative amplitude (H) of pressure fluctuation and the outlet peripheral velocity of turbine runner (V2u) are discussed, with a preliminary survey of the mechanism of pressure fluctuation.
It has been found that the airfoil cavitation worsened by the Karst water containing sand and CO2 is the principal cause of severe damage to the turbine runner at Liulangdong Hydropower Station. The mechanism of cavitation deterioration by the CO4 dissolved in the water and by the chemical and electrochemical etching of substances in Karst water is also examined.
In this paper the author presents the similarity laws used to study periodically unsteady-flow in draft tube of mixed-flow water turbine and gives a calculation expression with which the frequency and amplitude of a low-frequency pressure pulsation arising from the circulation of the flow through the draft tube can be calculated. Experiments in some water power plants have proved that the calcu- lation expression is available. The author also proposes that an axial-flow guide runner be installed near ...