高海拔地区掺气设施空腔回水数值模拟OA

To understand how a low-pressure environment increases the risk of cavitation damage,a numerical simulation study on the aeration facilities at the flood discharge bottom outlets in high-altitude regions was conducted.The effects of different two-phase flow models and varying ambient pressures on the numerical simulation of aerated water flow were compared and analyzed.The results show that the Eulerian model is more suitable for the simulation of aerated water flow.Low ambient pressure in the simulation of areated water flow at high altitude.Based on preliminary research results,a numerical simulation was performed using the Eulerian model at a local atmospheric pressure of 62 932 Pa for the spillway bottom outlet air injection facility.To address the issues of air pocket back-flow and inadequate ventilation observed in the original design,the size of the air vent holes was in-creased,and a local slope adjustment was implemented to optimize the body shape.Finally,a recom-mended body shape with 2.0 m air vents and a local slope adjustment was determined.By quantifying the degree of backflow using the dimensionless number λ(the ratio of backflow area to air pocket area),it is found that increasing the air vent hole size and implementing the local slope adjustment body shape effectively suppress the backflow phenomenon,with the backflow degree of λ gradually de-creasing and the aeration effect gradually improving.