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Dec 1, 2022 · Mulu et al. (2012) studied a Kaplan turbine model associated with a laser Doppler anemometry and multiple pressure sensors to optimise the draft tube to improve the turbine's efficiency, by using both experimental and computational tools. They found that the swirl leaving the runner influences the functionality of the draft tube while the blade-hub clearance showed some impact on the flow beneath the runner cone.
Kaplan turbine is a complete reaction turbine that works based on the lift force generated on the impeller blades due to its aerofoil shape [29]. The working process of the Kaplan turbine is similar to the propeller-type turbine along with adjustable runner blades so that it can work smoothly at vortices and shocks during partial load conditions.
Jul 1, 2024 · Shiraghaee et al. [14] conducted a study focusing on a Kaplan turbine model, specifically examining its performance to the left of a propeller curve, i.e., at a fixed runner blade angle, for different guide vane angles under PL. Under these conditions, the Kaplan turbine exhibits characteristics like those of a propeller turbine, including the development of an RVR akin to that observed in single-regulated turbines.
Nov 1, 2022 · Cavitation generally causes a decrease in efficiency and vibrations to a Kaplan turbine, but effectively identifying cavitation state is quite difficult. In this paper, a comprehensive test system consisting of a high-speed camera and a vibration testing system has been constructed based on a high-precision universal hydraulic machinery test stand.
Nov 20, 2023 · The Kaplan turbine runner is a complex multibody system consisting of various components such as blades, runner hub, blade lever, blade link, fork ear, crosshead, and piston rod, as shown in Fig. 5 (a). During operation, the hydraulic excitation generates axial hydraulic thrust on the runner and hydraulic torque on each blade, while the hydraulic torque usually causes the blade to open.
Sep 1, 2024 · For even small communities, using modest turbines could solve these issues. Chan and Aung [79] designed the runner blade profile for the 15-kWmicro hydropower plant Kaplan turbine. The single-regulated Kaplan turbine was used with a net head of 2.4 m and rated the water flow as 0.8 m 3 /s. The profile for the runner blade was divided into five ...
Bulb turbine, a kind of propeller (Kaplan) turbine, (A) Cross section of a bulb turbine and generator, (B) CFD illustration: Pressure and velocity distribution in a bulb turbine, (C) 3-, 4-, 5-blade bulb turbine runners, (D) 3D section of a vertical bulb unit, (E) a three-blade runner of a 75 MW bulb turbine, [6].
Jan 1, 2021 · Kaplan turbine is a complete reaction turbine that works based on the lift force generated on the impeller blades due to its aerofoil shape [29]. The working process of the Kaplan turbine is similar to the propeller-type turbine along with adjustable runner blades so that it can work smoothly at vortices and shocks during partial load conditions.
Jan 15, 2023 · Cavitation tests of the model Kaplan turbine were performed with the reference net head of 1.5 m for 11 settings of the runner opening angles (the same as in the case of basic efficiency tests). For single opening of the runner angle, 4 or 5 settings of double reduced rotational speed n 1 1 were used, namely: 150, 170, 188, 200 and 230 rpm.
Jan 1, 2010 · The turbine parts exposed to cavitation are the runners and draft tube cones for the Francis and Kaplan turbines. The effect of cavitation erosion was found to be reduced by improving the hydraulic design and production of components, adopting erosion resistant materials and arrangement of the turbines for operations within the good range of acceptable cavitation conditions.
