Redefinition of standard equation for discharge coefficient of throat-tapped flow nozzle

摘要

Throat-tapped flow nozzle, which is widely used in power plants, are examined for several geometric parameters, throat-tap and upstream-tap diameter, surface roughness of nozzle and so on. It is found that the largest influence factor is the throat-tap diameter. According to the experimental result, new equations for the throat-tapped flow nozzle are proposed. All experimental discharge coefficient is within ±0.5% of the proposed equations.