Plausible Differences between the Laboratory and Prototype Behaviors of Spillway Aerator Flows

An aerator, installed to prevent cavitation damages in spillways and outlet works, generates a typical two-phase flow affected by its configuration conditions. The major parameters of concern include air demand, jet trajectory streamwise changes concentration near chute bottom. This study reviews the theoretical basis deals with several aspects physical scale modeling, supported exclusively field measurements. Analyses reveal that sub-atmospheric pressure generated cavity should also be scaled which is seldom case laboratory environment. Thus, conventional approach upscale demand controversial. With data from both fields laboratories, it demonstrated direct conversion model prototype justified only if velocity exceeds 7.0–7.5 m/s or Reynolds number 1.58 × 106. Failing meet this premise would bring about errors for predictions; error extent depends on magnitude. In terms drop, differs factor less than 10 sufficient supply. model, along bottom drops considerably within one two lengths. such way decay much slower, higher level maintained over longer distance downstream impact location. intended provide insight studies engineering design.