Patent ID: 8186962
Filing Date: 2012-05-29
Classification: F01D,F04D,Y02T

Abstract:
1. A fan first stage rotating blade for a turbofan engine comprising: a leading edge part provided with a vertical hub portion positioned on the hub side so as to be substantially perpendicular to a fan rotary shaft; a backward mid-span portion inclined toward the downstream side from an upper limit of said vertical hub portion to an upper limit of said mid-span portion; and a tip portion integrally connected to said upper limit of said mid-span portion; said tip portion being forwardly inclined toward the upstream side from said upper limit of said mid-span portion to an upper limit of said tip portion; said vertical hub portion extending from an inner end position of 0% to an outer end position in a range of 20% to 50% with respect to a total radial span of the leading edge part and is positioned within a range of ±5° with respect to a plane perpendicular to the fan rotary shaft.