US 12,442,306 B2
Turbine engine with a primary stage of airfoils and a subsidiary stage of airfoils
Arthur William Sibbach, Boxford, MA (US); Nicholas Joseph Kray, Mason, OH (US); and Benjamin Thomas Van Oflen, Cincinnati, OH (US)
Assigned to General Electric Company, Evendale, OH (US)
Filed by GENERAL ELECTRIC COMPANY, Evendale, OH (US)
Filed on Apr. 23, 2025, as Appl. No. 19/187,119.
Application 19/187,119 is a continuation of application No. 18/489,533, filed on Oct. 18, 2023, granted, now 12,312,977.
Prior Publication US 2025/0250904 A1, Aug. 7, 2025
Int. Cl. F01D 5/28 (2006.01); F02K 3/06 (2006.01)
CPC F01D 5/286 (2013.01) [F02K 3/06 (2013.01); F05D 2240/303 (2013.01); F05D 2300/603 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A turbine engine comprising:
an engine core defining an engine centerline;
sets of airfoils comprising a set of part-span guide vanes and a set of fan blades, the sets of airfoils circumferentially arranged about the engine centerline, an airfoil of the sets of airfoils comprising:
a main body portion extending chordwise between a body leading edge and a trailing edge; and
a leading edge protector receiving at least a portion of the body leading edge of the main body portion, the leading edge protector extending chordwise from a protector leading edge towards the trailing edge of the main body portion to define a leading length (LL);
wherein the main body portion and the leading edge protector together define an exterior surface of the airfoil, wherein the protector leading edge is different from and forward of the body leading edge, and wherein a chord length (CL) is defined as extending chordwise between the protector leading edge and the trailing edge of the main body portion; and
wherein the LL is related to the CL by an airfoil protection factor

OG Complex Work Unit Math
 and a first APF (APF1) for the set of fan blades is greater than or equal to 0.07 and less than or equal to 0.67 (0.07≤APF1≤0.67) and a second APF (APF2) for the set of part-span guide vanes is greater than or equal to 0.04 and less than or equal to 10 (0.04≤APF2≤0.10).