Parameter Optimization on Asymmetry Orifice in a Differential Surge Chamber

For safeguarding smooth running of the hydropower station, it's very important to keep better hydraulic performance of the differential surge chamber. Both the entering resistance characteristics and the discharging one with different orifice parameters are optimized with numerical simulation. Two asymmetry orifices link the well and the ascending pipe, in which the orifice toward the ascending pipe is filleted and the other one extends outside. The results show that the hydraulic performance of the differential surge chamber is improved apparently as using the asymmetry orifices: Comparing to that of the symmetry orifice, the entering resistance coefficient with asymmetry orifice lowers, while the discharing one increases dramatically. The maximum difference between the entering resistance coefficient and the discharging one will be obtained as the extending pipe length and the fillet radius optimized.