Abstract：In order to improve the precision in blade drawing of centrifugal pump impellers and to shorten drawing period involved in conformal transformation methods,the calculation principles and methods are studied to determine the locations of dividing points along streamline when the front shroud streamline on meridional plane comprises two arcs tangential to each other.Based on mathematical analysis,3 possible locations of the first point on the lower arc which is a part of the front meridional streamline were described,and 3 tranncendental equations suitable to each case were derived.The solutions to these equations will determine the accurate locations of first point on lower arc and improve the shape of blade contours.The principles and methods presented here will alter the traditional manual way in blade drawing process and the resulting poor continuity and smoothness of blade contours.
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