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选择了叶轮叶片出口安放角、叶片进口冲角、叶轮出口宽度及导叶进口宽度这4个几何因素,按中心组合试验方法,设计了30组方案.通过FLUENT软件,对冲压井泵的全流场进行数值模拟,获得了额定工况下30组方案的效率.采用四元二次回归方程拟合四因素与效率值之间的函数关系,通过求解回归方程以寻求最优几何参数组合.利用Design Expert 6.0.5软件对回归模型进行分析,得到二次回归响应面图.由图中发现:在给定的范围内,叶轮出口宽度对效率的影响最为显著,表现为等值线最密;导叶进口宽度与叶轮叶片出口安放角次之;叶轮叶片进口冲角对效率的影响最小,表现不显著.通过样机试制及试验,发现在设计工况下采用两级全流场的数值模拟值与试验值相当接近,误差在2%以内,验证了数值模计算的可行性.
According to four geometric factors, such as the angle at the exit of the impeller, the entrance angle of the blade, the width of the exit of the impeller and the width of the guide vane, 30 programs were designed according to the center combination test method. By using FLUENT software, Field, the efficiency of 30 schemes under rated conditions was obtained.The quadratic quadratic regression equation was used to fit the functional relationship between the four factors and the efficiency, and the optimal geometric parameters were sought by solving the regression equation. Design Expert 6.0.5 software analyzes the regression model and obtains the quadratic regression response surface map, which shows that: within the given range, the outlet width of the impeller has the most significant effect on the efficiency, showing the most dense contour; The inlet width of the guide vane and the angle of the exit of the impeller blade are second to none.The impact angle of impeller blade entrance on the efficiency is minimal and the performance is insignificant.Through the prototyping and testing, it is found that the numerical simulation value Which is quite close to the experimental value with the error within 2%, which verifies the feasibility of numerical model calculation.