Gas turbine engine rotor blade geometry and method for selecting same

A method comprising:

• observing a Y-Z plane orthogonal to a rotational axis of a blade body of a rotor blade, a Z-direction of the Y-Z plane extends in a span direction of the blade body, a Y-direction of the Y-Z plane extends orthogonal to the Z-direction;
• intersecting the Y-Z plane with a recess forming a portion of a pressure side surface of the blade body to obtain a two-dimensional curve of a surface profile of the pressure side surface;
• extracting and normalizing Y-coordinates and Z-coordinates of the two-dimensional curve to determine a normalized two-dimensional curve of the surface profile of the pressure side surface;
• determining a straight-line equation for a straight line intersecting the normalized two-dimensional curve at a minimum span position and a maximum span position for the recess;
• and
• selecting a recess height of the recess such that the recess height is greater than or equal to a Y-value of 0.025 and less than or equal to the Y-value of 0.1, and the recess height is a maximum height measured in the Y-direction between the normalized two-dimensional curve and the straight line.