The paper refers to the numerical analysis of the internal flow in a hydraulic cross-flow turbine type Banki. The simulation includes nozzle, runner, shaft, and casing. The objectives of this study were to analyze the velocity and pressure fields of the cross-flow within the runner and to characterize its performance for different runner speeds. Absolute flow velocity angles are obtained at runner entrance for simulations with and without the runner. Flow recirculation in the runner interblade passages and shocks of the internal cross-flow cause considerable hydraulic losses by which the efficiency of the turbine decreases significantly.
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Email Address. Sign In. A new design of Banki's water turbine model for pico hydro in Tabanan Bali Abstract: Output power, speed, and efficiency of water turbines are affected by the curvature angle of the blade; this is because the energy of water flowing is absorbed by the blade of turbine. In this paper, the curvature angle of the blade of Banki's water turbine model is investigated to obtain the highest output power, speed, and efficiency of the water turbine.
The experimental model is used to investigate the curvature angle of the blade. The result of multiplying the diameter of the turbine with a generator pulley diameter is equal to Article :. DOI: Need Help?
Michell obtained patents for his turbine design in , and the manufacturing company Weymouth made it for many years. Today, the company founded by Ossberger is the leading manufacturer of this type of turbine. Unlike most water turbines , which have axial or radial flows, in a cross-flow turbine the water passes through the turbine transversely, or across the turbine blades. As with a water wheel , the water is admitted at the turbine's edge. After passing to the inside of the runner, it leaves on the opposite side, going outward. Passing through the runner twice provides additional efficiency. When the water leaves the runner, it also helps clean it of small debris and pollution.
Numerical Investigation of the Internal Flow in a Banki Turbine
This article is intended to help you build your own cross-flow turbine, also known as a Mitchell-Banki turbine. Mitchell is the original inventor of the turbine around Banki took up this design and explained its theory of operation in The results of the experiments were produced in this document titled the Banki Water Turbine by C. The low efficiency that Mockmore and Merryfield achieved may be due in part to the nozzle design; the Banki nozzle was close coupled to the turbine such that the nozzle outlet pressure may have been higher than atmospheric, as compared to the Mockmore and Merryfield design that came in at atmospheric pressure.