Discharge Coefficient of Small Submerged Orifices

Abstract

This paper deals with the variation in discharge of small submerged orifices used in aero-control systems. It is shown that the effects of cavitation can be high and can cause changes of discharge coefficient greater than those associated with Reynolds number when the flow is turbulent. The orifice length was altered and it was found that the most unstable conditions occurred when the length was half the diameter. Further tests were carried out with inlet chamfer in order to determine the optimum angle and depth of chamfer for cavitation suppression.