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Based on the observation of a model test and in combination with some theoretica l analysis, the researches of some basic hydrodynamics characteristics of cavity spiral flow in a large size level pipe with a shaft-inlet is presented in the paper, which include the basic flow pattern, formation condition of the cavit y spiral flow, discharge Q, cavity diameter d_0, wall pressure coeff icient C_pw, velocity distribution, total energy dissipation rate η etc. The results show that the basic flow patterns can be divided into three zones according to the variations in amount of ventilation Ф, cavity diame ter d_0 and gas pressure p_0 within cavity spiral flow when the up stream and downstream water level changes and that the basic hydrodynamics chara cteristics change with the flow pattern and have the different behaviour.
Based on the observation of a model test and in combination with some theoretica l analysis, the researches of some basic hydrodynamics characteristics of cavity spiral flow in a large size level pipe with a shaft-inlet is presented in the paper, which include the basic flow pattern, formation condition of the cavit y spiral flow, discharge Q, cavity diameter d_0, wall pressure coeff icient C_pw, velocity distribution, total energy dissipation rate η etc. The results show that the basic flow patterns can be divided into three zones according to the variations in amount of ventilation Ф, cavity diameter d_0 and gas pressure p_0 within cavity spiral flow when the up stream and downstream water level changes and that the basic hydrodynamics charaterteristics change with the flow pattern and have the different behavior.