Experimental Study on the Cavity Length in the Aerator under the Slight Slope
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Abstract:
The cavity length in the aerator is an important indicator for aeration effects. It is impacted by many factors, including the aerator shape (height and slope), hydraulic conditions, negative pressure in the cavity, and air resistance. In this paper, the physical model experiments were conducted to study the effects of chute slope and aerator shape on the cavity length under the conditions of slight slope. Furthermore, the relationships between the cavity length and each of the three factors, namely Froude number (Fr), Reynolds number (Re), and Weber number (We), were obtained, and the reason of the experiment results that the cavity length fluctuates with the Froude number (Fr) under the conditions of slight slope was analyzed. Finally, the cavity length was calculated using Yang Yong-sen’s formula, and the errors and correlations between the calculated and experimental values were analyzed. These results can provide references for optimizing the aerator design and improving the empirical calculation formulas.
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