Fan blade design method, fan blade, fan and turbofan engine

Abstract

The invention discloses a fan blade design method, a fan blade, a fan and a turbofan engine. The method comprises the following steps: determining a lower limit value of a trailing edge metal angle of a fan blade root according to a downstream supercharged blade root flow coefficient; according to the flow-total pressure relation and the flow-static pressure relation of the fan connotation, the upper limit value of the trailing edge metal angle of the fan blade root is determined; wherein the trailing edge metal angle is an included angle between a tangent line of a blade profile middle cambered surface of the blade profile section of the fan at the trailing edge and an axis of the engine. The metal angle at the tail edge of the fan blade root is controlled within a reasonable interval, so that the power capability of the fan blade root is improved, and better fan connotation performance and supercharging stage incoming flow are obtained.

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