Study on the Cavity Length of Sudden Lateral Enlargement and Bottom Drop Aerator Device Under the Condition of Pressure Flow
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Abstract:
Air entrainment and cavitation alleviation can relieve the cavitation damage of the high-speed discharge structure. Use of the sudden lateral enlargement and bottom drop aerator device can form both bottom cavity and lateral cavity, which can protect the bottom plate and side wall and therefore play an important role in the air entrainment and cavitation alleviation. Hydraulic model tests were performed on a sudden lateral enlargement and bottom drop aerator with different sudden expansion widths, down ridge heights, downstream slopes, and flow conditions under the condition of pressure flow. The impacts of sudden expansion width, down ridge height, and downstream slope on cavity length were initially identified. The results indicated that under the condition of pressure flow, the bottom cavity length has a positive correlation with the sudden expansion width and down ridge height but a negative correlation with the downstream slope; while the lateral cavity length has a positive correlation with the sudden expansion width but a negative correlation with the down ridge height and downstream slope. Finally, the relationship between the relative lateral cavity length and comprehensive hydraulic parameter X was determined under the condition of pressure flow, and an empirical equation to calculate the lateral cavity length was derived when
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