Abstract：Blade wrapping angle is an important geometric parameter pertinent to blade passage divergence and flow separation inside centrifugal impellers.Cylindrical blades are extensively used in low specific speed impellers.Currently several types of cylindrical blades exist,but their wrapping angles are all determined by boundary conditions at blade entrance and exit,and can′t be specified and adjusted by designers,which has been a significant problem in improving cylindrical blade performance.Based on interpolation method in a polar coordinate system,an interpolating function of the projected curve of a new type of cylindrical blades is formulated.The most notable feature of the new curve is that its wrapping angle can be specified by impeller designer.The process and results in deriving the interpolating function of the new curve are presented;four term expressions contained in the equation are obtained.Meanwhile,some geometric properties are analyzed,which proved the blade angles at exit and entrance of the curve equal to the angles required.This kind of cylindrical blade will be beneficial to improving hydraulic performance and efficiency of low specific speed impellers.
严敬；张江源；何敏；王桃. 离心泵可控包角圆柱形叶片型线方程[J]. 排灌机械工程学报, 2008, 26(5): 46-49.
YAN Jing, ZHANG Jiang-yuan, HE Min, WANG Tao. Equation of new type of cylindrical blade with adjustable wrapping angle of centrifugal impellers. Journal of Drainage and Irrigation Machinery Engin, 2008, 26(5): 46-49.
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