Analysis of Influence of Altitude on a Hydropower Station Spillway Flood Discharge Atomization Based on Water Air Two-phase Flow
The change of meteorological conditions caused by the increase of altitude elevation will affect the move-ment of the flood tongue,which in turn affects the temporal and spatial distribution of the flood fogging wind field and rain field.Based on the theory of water air two-phase flow,considering the changes of environmental pressure,tempera-ture,viscosity and air density at different altitudes,the influence of altitude on flood discharge atomization was studied by numerical simulation.The results show that under the same flood discharge conditions,the pressure value after stable flood discharge does not increase significantly with the increase of altitude,but the higher the altitude,the smaller the air resistance of the water tongue in the air is,and the greater the increase of pressure at the falling point under the same con-ditions.Through the analysis of wind speed at characteristic points,the increase in water viscosity brought by tempera-ture reduction has less impact on water mist movement,and the higher the altitude,the earlier the atomization wind speed reaches the maximum value,and the greater the maximum value that can be reached.When the flood discharge is stable,the intensity of near-surface fog rainfall increases with the increase of altitude,which is approximately linear with the elevation,and the range of heavy rainfall gradually expands with the increase of altitude.
flood discharge atomizationwater air two-phase flownumerical simulationhigh altitude
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