Improvement of the Runner Design of Francis Turbine using Computational Fluid Dynamics

Abstract

Results:The first stage involves the calculation of various dimensions such as the blade inlet and exit angle at hub and the mean and shroud positions to depict the meridional plane. The second stage deals with the CFD simulation. Various results were calculated and analyzed for factors affecting runner's performance. Results indicated that the head rise of the runner at the design point was approximately 39 m, which is lower than the specified head. Based on past experiences, the meridional plane was modified and blade inlet and lean angles were corrected. The process of meridional plane modification was repeated until the head rise was nearly equal to the specified head. Velocity vector and streamline should be a uniform stream. Conclusion/Recommendations: Results from calculating runner's performance were approximately 90% at design point. Existing absolute velocity component from CFD simulation pointed out that swirling flow occurred at the exit of runner. Based on the comparison of runner's performance between simulation results and experimental data from previous work reported in the literature, it is possible to use this method to simulate runner's performance of the Francis turbine.

British Airways is Ordering up to 42 Boeing 777-9s Aeronaves to Modernize the UK Flag Carriers Long-Haul Fleet

“…With three engines, Boeing's first aircraft was built with the sole intention of being a passenger transport. A modernized version, 80A, carrying eighteen passengers, made the first flight in September Abdullah et al, 2011;Kechiche et al, 2011;Ho et al, 2011;Rajbhandari et al, 2011;Aleksic and Lovric, 2011;Kaewnai and Wongwises, 2011;Idarwazeh, 2011;Ebrahim et al, 2012;Abdelkrim et al, 2012;Mohan et al, 2012;Abam et al, 2012;Hassan et al, 2012;Jalil and Sampe, 2013;Jaoude and El-Tawil, 2013;Ali and Shumaker, 2013;Zhao, 2013;El-Labban et al, 2013;Djalel et al, 2013;Nahas and Kozaitis, 2014).…”

NASA and the Conquest of Cosmic Space by Man

“…The purpose of man on this earth in his very short life is not just to eat, drink, have fun and try to make wealth and reproduce. Obviously, the great man as he is today must also have more noble purposes, dream, but and Raptis, 2011;Abdullah et al, 2011;Kechiche et al, 2011;Ho et al, 2011;Rajbhandari et al, 2011;Aleksic and Lovric, 2011;Kaewnai and Wongwises, 2011;Idarwazeh, 2011;Ebrahim et al, 2012;Abdelkrim et al, 2012;Mohan et al, 2012;Abam et al, 2012;Hassan et al, 2012;Jalil and Sampe, 2013;Jaoude and El-Tawil, 2013;Ali and Shumaker, 2013;Zhao, 2013;El-Labban et al, 2013;Djalel et al, 2013;Nahas and Kozaitis, 2013).…”

Giant Success for NASA when the InSight Probe has Reached "Safety" on Mars

“…It is a perfect laboratory to study the formation and evolution of rocky planets. Scientists know that Mars has low geological activity, but a Lander like InSight can reveal as long as Mars is active (Aversa et al, 2017a;and Hashim, 2009;Kwon et al, 2010;Aly and Abuelnasr, 2010;Farahani et al, 2010;Ahmed et al, 2010;Kunanoppadon, 2010;Helmy and El-Taweel, 2010;Qutbodin, 2010;Pattanasethanon, 2010;Fen et al, 2011;Thongwan et al, 2011;Theansuwan and Triratanasirichai, 2011;Tourab et al, 2011;Raptis et al, 2011;Momani et al, 2011;Ismail et al, 2011;Anizan et al, 2011;Tsolakis and Raptis, 2011;Abdullah et al, 2011;Kechiche et al, 2011;Ho et al, 2011;Rajbhandari et al, 2011;Aleksic and Lovric, 2011;Kaewnai and Wongwises, 2011;Idarwazeh, 2011;Ebrahim et al, 2012;Abdelkrim et al, 2012;Mohan et al, 2012;Abam et al, 2012;Hassan et al, 2012;Jalil and Sampe, 2013;Jaoude and El-Tawil, 2013;Ali and Shumaker, 2013;Zhao, 2013;El-Labban et al, 2013;Djalel et al, 2013;Nahas and Kozaitis, 2014).…”