The effect of blade geometry parameters on the hydraulic performance and cavitation behavior of a water jet propulsion pump
The research primarily involves the study of model pumps with different impeller blade structural paramet-ers using numerical simulation methods.It analyzes the effects of blade angle of attack,blade curvature,blade skew angle,and blade lean angle on hydraulic performance and cavitation performance.The results indicate the following trends:As the angle of attack increases,the head generally increases.Decreasing the angle of attack shifts the efficient operating range to-wards lower flow rates,while increasing it shifts the efficient operating range towards higher flow rates.Decreasing the angle of attack increases the head and critical cavitation margin but worsens cavitation performance.Increasing the angle of attack results in a decrease in both head and cavitation margin.With an increase in relative curvature,the pump head increases,and the magnitude of the increase becomes larger as the flow rate increases.Efficiency changes little for conditions below the design flow rate,but for conditions above the design flow rate,efficiency increases with increasing relative curvature.However,there is a slight decrease in cavitation margin,leading to an improvement in cavitation performance.Increasing the blade skew angle leads to a decrease in head and efficiency,and the critical cavitation margin at the design point decreases,indicating improved cavitation performance.Increasing the blade lean angle results in a decrease in head and efficiency for high-flow conditions,shifting the efficient range towards lower flow rates.However,cavitation margin increases,indicating a decrease in cavitation performance.
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维普
